{"id":10008064,"date":"2023-07-10T11:59:27","date_gmt":"2023-07-10T03:59:27","guid":{"rendered":"https:\/\/ityet.com\/?p=10008064"},"modified":"2023-07-10T11:59:27","modified_gmt":"2023-07-10T03:59:27","slug":"mysql%e4%b9%8binnodb%e5%ad%98%e5%82%a8%e7%bb%93%e6%9e%84-%e4%ba%ac%e4%b8%9c%e7%89%a9%e6%b5%81%e6%8a%80%e6%9c%af%e5%9b%a2%e9%98%9f","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10008064","title":{"rendered":"MySQL\u4e4bInnoDB\u5b58\u50a8\u7ed3\u6784 | \u4eac\u4e1c\u7269\u6d41\u6280\u672f\u56e2\u961f"},"content":{"rendered":"<h2>1 InnoDB\u5b58\u50a8\u5f15\u64ce<\/h2>\n<p>InnoDB\u5b58\u50a8\u5f15\u64ce\u6700\u65e9\u7531Innobase Oy\u516c\u53f8\u5f00\u53d1\uff08\u5c5e\u7b2c\u4e09\u65b9\u5b58\u50a8\u5f15\u64ce\uff09\u3002\u4eceMySQL 5.5\u7248\u672c\u5f00\u59cb\u4f5c\u4e3a\u8868\u7684\u9ed8\u8ba4\u5b58\u50a8\u5f15\u64ce\u3002\u8be5\u5b58\u50a8\u5f15\u64ce\u662f\u7b2c\u4e00\u4e2a\u5b8c\u6574\u652f\u6301ACID\u4e8b\u52a1\u7684MySQL\u5b58\u50a8\u5f15\u64ce\uff0c\u7279\u70b9\u662f\u884c\u9501\u8bbe\u8ba1\u3001\u652f\u6301MVCC\u3001\u652f\u6301\u5916\u952e\u3001\u63d0\u4f9b\u4e00\u81f4\u6027\u975e\u9501\u5b9a\u8bfb\uff0c\u975e\u5e38\u9002\u5408OLTP\u573a\u666f\u7684\u5e94\u7528\u4f7f\u7528\u3002\u76ee\u524d\u4e5f\u662f\u5e94\u7528\u6700\u5e7f\u6cdb\u7684\u5b58\u50a8\u5f15\u64ce\u3002  <\/p>\n<p>InnoDB\u5b58\u50a8\u5f15\u64ce\u67b6\u6784\u5305\u542b\u5185\u5b58\u7ed3\u6784\u548c\u78c1\u76d8\u7ed3\u6784\u4e24\u5927\u90e8\u5206\uff0c\u603b\u4f53\u67b6\u6784\u56fe\u5982\u4e0b\uff1a  <\/p>\n<p>8.0\u7248\u672c\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000043990793\" alt=\"\" title=\"\" loading=\"lazy\">[]()<\/p>\n<p>5.5\u7248\u672c\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000043990794\" alt=\"\" title=\"\" loading=\"lazy\">[]()<\/p>\n<h2>2 InnoDB \u5b58\u50a8\u7ed3\u6784<\/h2>\n<h3>2.1 \u78c1\u76d8\u7ed3\u6784<\/h3>\n<h4>2.1.1 \u8868\u7a7a\u95f4 Tablespaces<\/h4>\n<p>InnoDB\u5b58\u50a8\u5f15\u64ce\u7684\u903b\u8f91\u5b58\u50a8\u7ed3\u6784\u662f\u5c06\u6240\u6709\u7684\u6570\u636e\u90fd\u88ab\u903b\u8f91\u5730\u653e\u5728\u4e86\u4e00\u4e2a\u7a7a\u95f4\u4e2d\uff0c\u8fd9\u4e2a\u7a7a\u95f4\u4e2d\u7684\u6587\u4ef6\u5c31\u662f\u5b9e\u9645\u5b58\u5728\u7684\u7269\u7406\u6587\u4ef6\uff08.ibd\u6587\u4ef6\uff09\uff0c\u5373\u8868\u7a7a\u95f4\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u4e00\u4e2a\u6570\u636e\u5e93\u8868\u5360\u7528\u4e00\u4e2a\u8868\u7a7a\u95f4\uff0c\u8868\u7a7a\u95f4\u53ef\u4ee5\u770b\u505a\u662fInnoDB\u5b58\u50a8\u5f15\u64ce\u903b\u8f91\u7ed3\u6784\u7684\u6700\u9ad8\u5c42\uff0c\u6240\u4ee5\u7684\u6570\u636e\u90fd\u5b58\u653e\u5728\u8868\u7a7a\u95f4\u4e2d\uff0c\u4f8b\u5982\uff1a\u8868\u5bf9\u5e94\u7684\u6570\u636e\u3001\u7d22\u5f15\u3001insert buffer bitmap undo\u4fe1\u606f\u3001insert buffer \u7d22\u5f15\u9875\u3001double write buffer files \u7b49\u90fd\u662f\u653e\u5728\u5171\u4eab\u8868\u7a7a\u95f4\u4e2d\u7684\u3002<\/p>\n<p>\u8868\u7a7a\u95f4\u5206\u4e3a\u7cfb\u7edf\u8868\u7a7a\u95f4(ibdata1\u6587\u4ef6)(\u5171\u4eab\u8868\u7a7a\u95f4)\u3001\u4e34\u65f6\u8868\u7a7a\u95f4\u3001\u5e38\u89c4\u8868\u7a7a\u95f4\u3001Undo\u8868\u7a7a\u95f4\u548cfile-per-table\u8868\u7a7a\u95f4(\u72ec\u7acb\u8868\u7a7a\u95f4)\u3002\u7cfb\u7edf\u8868\u7a7a\u95f4\u53c8\u5305\u62ec\u53cc\u5199\u7f13\u51b2\u533a(Doublewrite buffer)\u3001Change Buffer\u7b49<\/p>\n<p>1.\u7cfb\u7edf\u8868\u7a7a\u95f4 System Tablespace<\/p>\n<p>\u7cfb\u7edf\u8868\u7a7a\u95f4\u53ef\u4ee5\u5bf9\u5e94\u6587\u4ef6\u7cfb\u7edf\u4e0a\u4e00\u4e2a\u6216\u591a\u4e2a\u5b9e\u9645\u7684\u6587\u4ef6\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c InnoDB\u4f1a\u5728\u6570\u636e\u76ee\u5f55\u4e0b\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a.ibdata1\uff0c\u5927\u5c0f\u4e3a 12M\u7684\u6587\u4ef6\uff0c\u8fd9\u4e2a\u6587\u4ef6\u5c31\u662f\u5bf9\u5e94\u7684\u7cfb\u7edf\u8868\u7a7a\u95f4\u5728\u6587\u4ef6\u7cfb\u7edf\u4e0a\u7684\u8868\u793a\u3002\u8fd9\u4e2a\u6587\u4ef6\u662f\u53ef\u4ee5\u81ea\u6269\u5c55\u7684\uff0c\u5f53\u4e0d\u591f\u7528\u7684\u65f6\u5019\u5b83\u4f1a\u81ea\u5df1\u589e\u52a0\u6587\u4ef6\u5927\u5c0f\u3002\u9700\u8981\u6ce8\u610f\u7684\u4e00\u70b9\u662f\uff0c\u5728\u4e00\u4e2aMySQL\u670d\u52a1\u5668\u4e2d\uff0c\u7cfb\u7edf\u8868\u7a7a\u95f4\u53ea\u6709\u4e00\u4efd\u3002\u4eceMySQL5.5.7\u5230MySQL5.6.6\u4e4b\u95f4\u7684\u5404\u4e2a\u7248\u672c\u4e2d\uff0c\u6211\u4eec\u8868\u4e2d\u7684\u6570\u636e\u90fd\u4f1a\u88ab\u9ed8\u8ba4\u5b58\u50a8\u5230\u8fd9\u4e2a\u7cfb\u7edf\u8868\u7a7a\u95f4\u3002<\/p>\n<pre><code>show variables like '%innodb_data_file_path%'<\/code><\/pre>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000043990795\" alt=\"\" title=\"\" loading=\"lazy\">[]()<\/p>\n<p>2.\u72ec\u7acb\u8868\u7a7a\u95f4<\/p>\n<p>\u5728MySQL5.6.6\u4ee5\u53ca\u4e4b\u540e\u7684\u7248\u672c\u4e2d\uff0c InnoDB\u5e76\u4e0d\u4f1a\u9ed8\u8ba4\u7684\u628a\u5404\u4e2a\u8868\u7684\u6570\u636e\u5b58\u50a8\u5230\u7cfb\u7edf\u8868\u7a7a\u95f4\u4e2d\uff0c\u800c\u662f\u4e3a\u6bcf\u4e00\u4e2a\u8868\u5efa\u7acb\u4e00\u4e2a\u72ec\u7acb\u8868\u7a7a\u95f4\uff0c\u4e5f\u5c31\u662f\u8bf4\u6211\u4eec\u521b\u5efa\u4e86\u591a\u5c11\u4e2a\u8868\uff0c\u5c31\u6709\u591a\u5c11\u4e2a\u72ec\u7acb\u8868\u7a7a\u95f4\u3002\u4f7f\u7528\u72ec\u7acb\u8868\u7a7a\u95f4\u6765\u5b58\u50a8\u8868\u6570\u636e\u7684\u8bdd\uff0c\u4f1a\u5728\u8be5\u8868\u6240\u5c5e\u6570\u636e\u5e93\u5bf9\u5e94\u7684\u5b50\u76ee\u5f55\u4e0b\u521b\u5efa\u4e00\u4e2a\u8868\u793a\u8be5\u72ec\u7acb\u8868\u7a7a\u95f4\u7684\u6587\u4ef6\uff0c\u6587\u4ef6\u540d\u548c\u8868\u540d\u76f8\u540c\uff0c\u53ea\u4e0d\u8fc7\u6dfb\u52a0\u4e86\u4e00\u4e2a.ibd\u7684\u6269\u5c55\u540d\u800c\u5df2\u3002<\/p>\n<pre><code>show variables like '%innodb_file_per_table%'<\/code><\/pre>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000043990796\" alt=\"\" title=\"\" loading=\"lazy\">[]()<\/p>\n<p>\u72ec\u7acb\u8868\u7a7a\u95f4\u53ea\u662f\u5b58\u653e\u6570\u636e\u3001\u7d22\u5f15\u548c\u63d2\u5165\u7f13\u51b2Bitmap\u9875\uff0c\u5176\u4ed6\u7c7b\u7684\u6570\u636e\u5982\u56de\u6eda\uff08undo\uff09\u4fe1\u606f\u3001\u63d2\u5165\u7f13\u51b2\u7d22\u5f15\u9875\u3001\u7cfb\u7edf\u4e8b\u52a1\u4fe1\u606f\u3001\u4e8c\u6b21\u5199\u7f13\u51b2\u7b49\u8fd8\u662f\u5b58\u653e\u5728\u539f\u6765\u7684\u7cfb\u7edf\u8868\u7a7a\u95f4\u3002<\/p>\n<p>3.\u5176\u4ed6\u7c7b\u578b\u7684\u8868\u7a7a\u95f4<\/p>\n<p>\u968f\u7740MySQL\u7684\u53d1\u5c55\uff0c\u9664\u4e86\u4e0a\u8ff0\u4e24\u79cd\u8868\u7a7a\u95f4\u4e4b\u5916\uff0c\u73b0\u5728\u8fd8\u65b0\u63d0\u51fa\u4e86\u4e00\u4e9b\u4e0d\u540c\u7c7b\u578b\u7684\u8868\u7a7a\u95f4\uff0c\u6bd4\u5982\u901a\u7528\u8868\u7a7a\u95f4 (general tablespace)\u3001undo\u8868\u7a7a\u95f4(undo tablespace)\u3001\u4e34\u65f6\u8868\u7a7a\u95f4(temporary tablespace)\u7b49<\/p>\n<p>4.\u8868\u7a7a\u95f4\u7ed3\u6784<\/p>\n<p>\u8868\u7a7a\u95f4\u53c8\u7531\u6bb5(segment)\u3001\u533a( extent)\u3001\u9875(page)\u7ec4\u6210\uff0c\u9875\u662fInnoDB\u78c1\u76d8\u7ba1\u7406\u7684\u6700\u5c0f\u5355\u4f4d\u3002\u5728\u6211\u4eec\u6267\u884csql\u65f6\uff0c\u4e0d\u8bba\u662f\u67e5\u8be2\u8fd8\u662f\u4fee\u6539\uff0cmysql \u603b\u4f1a\u628a\u6570\u636e\u4ece\u78c1\u76d8\u8bfb\u53d6\u5185\u5185\u5b58\u4e2d\uff0c\u800c\u4e14\u5728\u8bfb\u53d6\u6570\u636e\u65f6\uff0c\u4e0d\u4f1a\u5355\u72ec\u52a0\u5728\u4e00\u6761\u6570\u636e\uff0c\u800c\u662f\u76f4\u63a5\u52a0\u8f7d\u6570\u636e\u6240\u5728\u7684\u6570\u636e\u9875\u5230\u5185\u5b58\u4e2d\u3002\u8868\u7a7a\u95f4\u672c\u8d28\u4e0a\u5c31\u662f\u4e00\u4e2a\u5b58\u653e\u5404\u79cd\u9875\u7684\u9875\u9762\u6c60\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000043990797\" alt=\"\" title=\"\" loading=\"lazy\">[]()<\/p>\n<p>\u300c\u9875\u300d\u662fInnoDB\u7ba1\u7406\u5b58\u50a8\u7a7a\u95f4\u7684\u57fa\u672c\u5355\u4f4d\uff0c\u4e5f\u662f\u5185\u5b58\u548c\u78c1\u76d8\u4ea4\u4e92\u7684\u57fa\u672c\u5355\u4f4d\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u54ea\u6015\u4f60\u9700\u89811\u5b57\u8282\u7684\u6570\u636e\uff0cInnoDB\u4e5f\u4f1a\u8bfb\u53d6\u6574\u4e2a\u9875\u7684\u6570\u636e\uff0cInnoDB\u6709\u5f88\u591a\u7c7b\u578b\u7684\u9875\uff0c\u5b83\u4eec\u7684\u7528\u5904\u4e5f\u5404\u4e0d\u76f8\u540c\u3002\u6bd4\u5982\uff1a\u6709\u5b58\u653eundo\u65e5\u5fd7\u7684\u9875\u3001\u6709\u5b58\u653eINODE\u4fe1\u606f\u7684\u9875\u3001\u6709\u5b58\u653eChange Buffer\u4fe1\u606f\u7684\u9875\u3001\u5b58\u653e\u7528\u6237\u8bb0\u5f55\u6570\u636e\u7684\u9875\uff08\u7d22\u5f15\u9875\uff09\u7b49\u7b49\u3002<\/p>\n<p>InnoDB\u9ed8\u8ba4\u7684\u9875\u5927\u5c0f\u662f16KB\uff0c\u5728\u521d\u59cb\u5316\u8868\u7a7a\u95f4\u4e4b\u524d\u53ef\u4ee5\u5728\u914d\u7f6e\u6587\u4ef6\u4e2d\u8fdb\u884c\u914d\u7f6e\uff0c\u4e00\u65e6\u6570\u636e\u5e93\u521d\u59cb\u5316\u5b8c\u6210\u5c31\u4e0d\u53ef\u518d\u53d8\u66f4\u4e86\u3002<\/p>\n<pre><code>SHOW VARIABLES LIKE 'innodb_page_size'<\/code><\/pre>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000043990798\" alt=\"\" title=\"\" loading=\"lazy\">[]()<\/p>\n<h4>2.1.2 \u91cd\u5199\u65e5\u5fd7 redo log\u6587\u4ef6<\/h4>\n<p>redo log\u8bb0\u5f55\u6570\u636e\u5e93\u7684\u53d8\u66f4\uff0c\u6570\u636e\u5e93\u5d29\u6e83\u540e\uff0c\u4f1a\u4eceredo log\u83b7\u53d6\u4e8b\u52a1\u4fe1\u606f\uff0c\u8fdb\u884c\u7cfb\u7edf\u6062\u590d\u3002redo log\u5728\u78c1\u76d8\u4e0a\u8868\u73b0\u4e3aib_logfile0\u548cib_logfile1\u4e24\u4e2a\u6587\u4ef6\u3002MySQL\u4f1a\u5728\u4e8b\u52a1\u7684\u63d0\u4ea4\u524d\u5c06redo\u65e5\u5fd7\u5237\u65b0\u56de\u78c1\u76d8\u3002<\/p>\n<p>\u5728\u540c\u4e00\u65f6\u95f4\u63d0\u4ea4\u7684\u4e8b\u52a1\uff0c\u4f1a\u91c7\u7528\u7ec4\u63d0\u4ea4\uff08group commit\uff09\u7684\u65b9\u5f0f\u4e00\u6b21\u6027\u5237\u65b0\u56de\u78c1\u76d8\u3002\u4ece\u800c\u907f\u514d\u4e00\u4e2a\u4e8b\u52a1\u5237\u65b0\u4e00\u6b21\u78c1\u76d8\uff0c\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n<h4>2.1.3 Double Write Files \u53cc\u5199\u7f13\u51b2\u6587\u4ef6<\/h4>\n<p>double write \u662f\u4fdd\u969c InnoDB \u5b58\u50a8\u5f15\u64ce\u64cd\u4f5c\u6570\u636e\u9875\u7684\u53ef\u9760\u6027\u3002double write \u5206\u4e3a\u4e24\u90e8\u5206\u7ec4\u6210\uff0c\u4e00\u90e8\u5206\u5728\u5185\u5b58\u4e2d\u7684 double write buffer, \u5927\u5c0f\u4e3a 2MB\uff0c\u53e6\u4e00\u90e8\u5206\u662f\u7269\u7406\u78c1\u76d8\u4e0a\u5171\u4eab\u8868\u7a7a\u95f4\u4e2d\u8fde\u7eed\u7684128\u4e2a\u6570\u636e\u9875\uff0c\u53732\u4e2a\u533a\u5927\u5c0f\uff08\u540c\u6837\u662f2MB\uff09\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000043990799\" alt=\"\" title=\"\" loading=\"lazy\">[]()<\/p>\n<h3>2.2 \u5185\u5b58\u7ed3\u6784<\/h3>\n<p>InnoDB\u5b58\u50a8\u5f15\u64ce\u662f\u57fa\u4e8e\u78c1\u76d8\u5b58\u50a8\u7684\uff0c\u5e76\u5c06\u5176\u4e2d\u7684\u8bb0\u5f55\u6309\u7167\u9875\u7684\u65b9\u5f0f\u8fdb\u884c\u7ba1\u7406\uff0c\u56e0\u6b64\u53ef\u5c06\u5176\u89c6\u4e3a\u57fa\u4e8e\u78c1\u76d8\u7684\u6570\u636e\u5e93\u7cfb\u7edf\uff08Disk-base Database\uff09\u3002\u5728\u6570\u636e\u5e93\u4e2dCPU\u901f\u5ea6\u4e0e\u78c1\u76d8\u901f\u5ea6\u662f\u6709\u5f88\u5927\u5dee\u8ddd\u7684\uff0c\u57fa\u4e8e\u78c1\u76d8\u7684\u6570\u636e\u5e93\u7cfb\u7edf\u901a\u5e38\u4f7f\u7528\u7f13\u51b2\u6c60\u6280\u672f\u6765\u63d0\u9ad8\u6570\u636e\u5e93\u7684\u6574\u4f53\u6027\u80fd\u3002\u7ed3\u6784\u5982\u56fe\u6240\u793a\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000043990800\" alt=\"\" title=\"\" loading=\"lazy\">[]()<\/p>\n<h4>2.1.1 \u7f13\u5b58\u6c60 Buffer Pool<\/h4>\n<p>Buffer Pool\u662fInnoDB\u5185\u5b58\u4e2d\u7684\u4e00\u5757\u5360\u6bd4\u8f83\u5927\u7684\u533a\u57df\uff0c\u901a\u8fc7\u5185\u5b58\u7684\u901f\u5ea6\u6765\u5f25\u8865\u78c1\u76d8\u901f\u5ea6\u6162\u5bf9\u6570\u636e\u5e93\u6027\u80fd\u7684\u5f71\u54cd\u3002\u5728\u6570\u636e\u5e93\u4e2d\u8fdb\u884c\u8bfb\u53d6\u9875\u7684\u64cd\u4f5c\uff0c\u9996\u5148\u5c06\u4ece\u78c1\u76d8\u8bfb\u5230\u7684\u9875\u653e\u5728\u7f13\u51b2\u6c60\u4e2d\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u79f0\u4e3a\u5c06\u9875\u201dFIX\u201d\u5728\u7f13\u51b2\u6c60\u4e2d\uff0c\u4e0b\u6b21\u518d\u8bfb\u5230\u76f8\u540c\u7684\u9875\u65f6\uff0c\u9996\u5148\u5224\u65ad\u8be5\u9875\u662f\u5426\u5728\u7f13\u51b2\u6c60\u4e2d\uff0c\u82e5\u5728\u7f13\u51b2\u6c60\u4e2d\uff0c\u76f4\u63a5\u8bfb\u53d6\u8be5\u9875\uff0c\u5426\u5219\u8bfb\u53d6\u78c1\u76d8\u4e0a\u7684\u9875\u3002<\/p>\n<p>\u5bf9\u4e8e\u6570\u636e\u5e93\u4e2d\u7684\u9875\u7684\u4fee\u6539\u64cd\u4f5c\uff0c\u9996\u5148\u4fee\u6539\u5728\u7f13\u51b2\u6c60\u4e2d\u7684\u9875\uff0c\u7136\u540e\u518d\u4ee5\u4e00\u5b9a\u9891\u7387\u5237\u65b0\u5230\u78c1\u76d8\u4e0a\uff0c\u8fd9\u91cc\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u9875\u4ece\u7f13\u51b2\u6c60\u5237\u65b0\u56de\u78c1\u76d8\u7684\u64cd\u4f5c\u5e76\u4e0d\u662f\u5728\u6bcf\u6b21\u9875\u53d1\u751f\u66f4\u65b0\u65f6\u89e6\u53d1\uff0c\u800c\u662f\u901a\u8fc7\u4e00\u79cd\u79f0\u4e3aCheckpoint\u7684\u673a\u5236\u5237\u65b0\u56de\u78c1\u76d8\u3002<\/p>\n<p>\u7f13\u5b58\u533a\u7f13\u5b58\u7684\u6570\u636e\u9875\u7c7b\u578b\u6709\uff1a\u7d22\u5f15\u9875\uff0c\u6570\u636e\u9875\uff0cundo\u9875\uff0c\u63d2\u5165\u7f13\u51b2\uff08change buffer\uff09\uff0c\u81ea\u9002\u5e94\u54c8\u5e0c\u7d22\u5f15\uff08adaptive hash index\uff09\uff0cInnoDB\u5b58\u50a8\u9501\u4fe1\u606f\uff08lock info\uff09\uff0c\u6570\u636e\u5b57\u5178\u4fe1\u606f\uff08data dictionary\uff09\u3002\u6570\u636e\u9875\u548c\u7d22\u5f15\u9875\u5360\u636e\u4e86\u7f13\u51b2\u6c60\u5f88\u5927\u90e8\u5206\u3002<\/p>\n<p>InnoDB1.0.x\u7248\u672c\u5f00\u59cb\uff0c\u5141\u8bb8\u6709\u591a\u4e2a\u7f13\u51b2\u6c60\u5b9e\u4f8b\uff0c\u6bcf\u4e2a\u9875\u6839\u636e\u54c8\u5e0c\u503c\u5e73\u5747\u5206\u914d\u5230\u4e0d\u540c\u7f13\u51b2\u6c60\u7684\u5b9e\u4f8b\u4e2d\uff0c\u8fd9\u6837\u53ef\u4ee5\u51cf\u5c11\u6570\u636e\u5e93\u5185\u90e8\u8d44\u6e90\u7ade\u4e89\uff0c\u589e\u52a0\u6570\u636e\u5e93\u7684\u5e76\u53d1\u5904\u7406\u80fd\u529b\u3002<\/p>\n<pre><code>show variables like 'innodb_buffer_pool_instances'<\/code><\/pre>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000043990801\" alt=\"\" title=\"\" loading=\"lazy\">[]()<\/p>\n<p>\u6574\u4e2aBuffer Pool\u7684\u8bf4\u660e\u7528\u4e00\u5f20\u56fe\u6765\u6982\u62ec\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000043990802\" alt=\"\" title=\"\" loading=\"lazy\">[]()<\/p>\n<p>1.LRU List\uff0cFree List\u548cFlush List\u2014\u2014\u7ba1\u7406InnoDB\u5185\u5b58\u533a\u57df<\/p>\n<p>\u4e3a\u4e86\u7f13\u5b58\u7ba1\u7406\u7684\u6548\u7387\uff0c\u7f13\u51b2\u6c60\u88ab\u5b9e\u73b0\u4e3a\u9875\u94fe\u8868\uff0c\u91c7\u7528\u4e09\u4e2a\u94fe\u8868\u7ef4\u62a4\u5185\u5b58\u9875\uff0c\u800c\u5185\u5b58\u9875\u4e5f\u56e0\u6b64\u5bf9\u5e94 3 \u79cd\u72b6\u6001\uff1a Free \u5c1a\u672a\u4f7f\u7528\uff1b Clean \u5df2\u4f7f\u7528\u4f46\u672a\u4fee\u6539\uff1b Dirty\uff08\u810f\u9875\uff09\u5df2\u4fee\u6539\uff1bFree\u9875\u53ea\u4f4d\u4e8eFree List\uff0c\u800cClean\u548cDirty\u9875\u540c\u65f6\u4f4d\u4e8eLRU List\uff0cDirty\u9875\u53ea\u5b58\u5728\u4e8eFlush List\uff1b<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000043990803\" alt=\"\" title=\"\" loading=\"lazy\">[]()<\/p>\n<p>1\uff09LRU List\uff1a<\/p>\n<p>\u6570\u636e\u5e93\u4e2d\u7684\u7f13\u51b2\u6c60\u662f\u901a\u8fc7LRU\uff08Latest Recent Used\uff0c\u6700\u8fd1\u6700\u5c11\u4f7f\u7528\uff09\u7b97\u6cd5\u6765\u8fdb\u884c\u7ba1\u7406\u7684\u3002\u5373\u6700\u9891\u7e41\u4f7f\u7528\u7684\u9875\u5728LRU\u5217\u8868\u7684\u524d\u7aef\uff0c\u800c\u6700\u5c11\u4f7f\u7528\u7684\u9875\u5728LRU\u5217\u8868\u7684\u5c3e\u7aef\u3002\u5f53\u7f13\u51b2\u6c60\u4e0d\u80fd\u5b58\u653e\u65b0\u8bfb\u53d6\u5230\u7684\u9875\u65f6\uff0c\u5c06\u9996\u5148\u91ca\u653eLRU\u5217\u8868\u4e2d\u5c3e\u7aef\u7684\u9875\u3002<\/p>\n<p>\u5728InnoDB\u5b58\u50a8\u5f15\u64ce\u4e2d\uff0c\u7f13\u51b2\u6c60\u4e2d\u9875\u7684\u5927\u5c0f\u9ed8\u8ba4\u4e3a16KB\uff0c\u540c\u6837\u4f7f\u7528LRU\u7b97\u6cd5\u5bf9\u7f13\u51b2\u6c60\u8fdb\u884c\u7ba1\u7406\u3002\u7a0d\u6709\u4e0d\u540c\u7684\u662fInnoDB\u5b58\u50a8\u5f15\u64ce\u5bf9\u4f20\u7edf\u7684LRU\u7b97\u6cd5\u505a\u4e86\u4e00\u4e9b\u4f18\u5316\u3002\u5728InnoDB\u7684\u5b58\u50a8\u5f15\u64ce\u4e2d\uff0cLRU\u5217\u8868\u4e2d\u8fd8\u52a0\u5165\u4e86midpoint\u4f4d\u7f6e\u3002\u65b0\u8bfb\u53d6\u5230\u7684\u9875\uff0c\u867d\u7136\u662f\u6700\u65b0\u8bbf\u95ee\u7684\u9875\uff0c\u4f46\u5e76\u4e0d\u662f\u76f4\u63a5\u653e\u5165\u5230LRU\u5217\u8868\u7684\u9996\u90e8\uff0c\u800c\u662f\u653e\u5165\u5230LRU\u5217\u8868\u7684midpoint\u4f4d\u7f6e\u3002\u8fd9\u4e2a\u7b97\u6cd5\u5728InnoDB\u5b58\u50a8\u5f15\u64ce\u4e0b\u79f0\u4e3amidpoint insertion strategy\u3002\u5728\u9ed8\u8ba4\u914d\u7f6e\u4e0b\uff0c\u8be5\u4f4d\u7f6e\u5728LRU\u5217\u8868\u957f\u5ea6\u76845\/8\u5904\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000043990804\" alt=\"\" title=\"\" loading=\"lazy\">[]()<\/p>\n<pre><code>SHOW VARIABLES LIKE'innodb_old_blocks_pct'<\/code><\/pre>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000043990805\" alt=\"\" title=\"\" loading=\"lazy\">[]()<\/p>\n<p>\u53c2\u6570innodb_old_blocks_pct\u9ed8\u8ba4\u503c\u4e3a37\uff0c\u8868\u793a\u65b0\u8bfb\u53d6\u7684\u9875\u63d2\u5165\u5230LRU\u5217\u8868\u5c3e\u7aef\u768437%\u7684\u4f4d\u7f6e\uff08\u5dee\u4e0d\u591a3\/8\u7684\u4f4d\u7f6e\uff09\u3002\u5728InnoDB\u5b58\u50a8\u5f15\u64ce\u4e2d\uff0c\u628amidpoint\u4e4b\u540e\u7684\u5217\u8868\u79f0\u4e3aold\u5217\u8868\uff0c\u4e4b\u524d\u7684\u5217\u8868\u79f0\u4e3anew\u5217\u8868\u3002\u53ef\u4ee5\u7b80\u5355\u5730\u7406\u89e3\u4e3anew\u5217\u8868\u4e2d\u7684\u9875\u90fd\u662f\u6700\u4e3a\u6d3b\u8dc3\u7684\u70ed\u70b9\u6570\u636e<\/p>\n<ul>\n<li>\u90a3\u4e3a\u4ec0\u4e48\u4e0d\u91c7\u7528\u6734\u7d20\u7684LRU\u7b97\u6cd5\uff0c\u76f4\u63a5\u5c06\u8bfb\u53d6\u7684\u9875\u653e\u5165\u5230LRU\u5217\u8868\u7684\u9996\u90e8\u5462\uff1f<\/li>\n<\/ul>\n<p>\u8fd9\u662f\u56e0\u4e3a\u82e5\u76f4\u63a5\u5c06\u8bfb\u53d6\u5230\u7684\u9875\u653e\u5165\u5230LRU\u7684\u9996\u90e8\uff0c\u90a3\u4e48\u67d0\u4e9bSQL\u64cd\u4f5c\u53ef\u80fd\u4f1a\u4f7f\u7f13\u51b2\u6c60\u4e2d\u7684\u9875\u88ab\u5237\u65b0\u51fa\uff0c\u4ece\u800c\u5f71\u54cd\u7f13\u51b2\u6c60\u7684\u6548\u7387\u3002\u5e38\u89c1\u7684\u8fd9\u7c7b\u64cd\u4f5c\u4e3a\u7d22\u5f15\u6216\u6570\u636e\u7684\u626b\u63cf\u64cd\u4f5c\u3002\u8fd9\u7c7b\u64cd\u4f5c\u9700\u8981\u8bbf\u95ee\u8868\u4e2d\u7684\u8bb8\u591a\u9875\uff0c\u751a\u81f3\u662f\u5168\u90e8\u7684\u9875\uff0c\u800c\u8fd9\u4e9b\u9875\u901a\u5e38\u6765\u8bf4\u53c8\u4ec5\u5728\u8fd9\u6b21\u67e5\u8be2\u64cd\u4f5c\u4e2d\u9700\u8981\uff0c\u5e76\u4e0d\u662f\u6d3b\u8dc3\u7684\u70ed\u70b9\u6570\u636e\u3002\u5982\u679c\u9875\u88ab\u653e\u5165LRU\u5217\u8868\u7684\u9996\u90e8\uff0c\u90a3\u4e48\u975e\u5e38\u53ef\u80fd\u5c06\u6240\u9700\u8981\u7684\u70ed\u70b9\u6570\u636e\u9875\u4eceLRU\u5217\u8868\u4e2d\u79fb\u9664\uff0c\u800c\u5728\u4e0b\u4e00\u6b21\u9700\u8981\u8bfb\u53d6\u8be5\u9875\u65f6\uff0cInnoDB\u5b58\u50a8\u5f15\u64ce\u9700\u8981\u518d\u6b21\u8bbf\u95ee\u78c1\u76d8\u3002<\/p>\n<ul>\n<li>\u89e3\u51b3\u70ed\u70b9\u6570\u636e\u88ab\u79fb\u9664LRU\u5217\u8868<\/li>\n<\/ul>\n<p>InnoDB\u5b58\u50a8\u5f15\u64ce\u5f15\u5165\u4e86\u53e6\u4e00\u4e2a\u53c2\u6570\u6765\u8fdb\u4e00\u6b65\u7ba1\u7406LRU\u5217\u8868\uff0c\u8fd9\u4e2a\u53c2\u6570\u662finnodb_old_blocks_time\uff0c\u7528\u4e8e\u8868\u793a\u9875\u8bfb\u53d6\u5230mid\u4f4d\u7f6e\u540e\u9700\u8981\u7b49\u5f85\u591a\u4e45\u624d\u4f1a\u88ab\u52a0\u5165\u5230LRU\u5217\u8868\u7684\u70ed\u7aef\uff0c\u901a\u8fc7\u8fd9\u4e2a\u65b9\u6cd5\u5c3d\u53ef\u80fd\u4f7fLRU\u5217\u8868\u4e2d\u70ed\u70b9\u6570\u636e\u4e0d\u88ab\u5237\u51fa\u3002<\/p>\n<pre><code>SHOW VARIABLES LIKE'innodb_old_blocks_time'<\/code><\/pre>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000043990806\" alt=\"\" title=\"\" loading=\"lazy\">[]()<\/p>\n<p>\u5f53\u6709\u65b0\u7684\u6570\u636e\u4ece\u78c1\u76d8\u67e5\u8be2\u5230\u5185\u5b58\u65f6\uff0c\u4f1a\u5199\u5165\u5230 old sub list \u7684\u5934\u90e8\uff0c\u5f53\u6b64\u6570\u636e\u518d\u6b21\u88ab\u67e5\u8be2\u7684\u65f6\u5019\uff0c\u5373\u5728 old sublist \u4e2d\u547d\u4e2d\u4e4b\u540e\uff0c\u624d\u4f1a\u653e\u5165 new sublist \u7684\u5934\u90e8\u3002\u5f53\u9875\u4eceLRU\u5217\u8868\u7684old\u90e8\u5206\u52a0\u5165\u5230new\u90e8\u5206\u65f6\uff0c\u79f0\u6b64\u65f6\u53d1\u751f\u7684\u64cd\u4f5c\u4e3apage made young\uff1b\u5982\u679c\u56e0\u4e3ainnodb_old_blocks_time\u7684\u8bbe\u7f6e\u5bfc\u81f4\u9875\u6ca1\u6709\u4eceold\u90e8\u5206\u79fb\u52a8\u5230new\u90e8\u5206\u7684\u64cd\u4f5c\uff0c\u79f0\u4e3apage not made young\u3002  <br \/>\u901a\u8fc7\u547d\u4ee4SHOW ENGINE INNODB STATUS\u53ef\u4ee5\u89c2\u5bdf\u5230\u5982\u4e0b\u5185\u5bb9\uff1a<\/p>\n<pre><code>SHOW ENGINE INNODB STATUS\n\n----------------------\nBUFFER POOL AND MEMORY\n----------------------\nTotal large memory allocated 137428992\nDictionary memory allocated 10620037\nBuffer pool size   8191  \/\/ \u8868\u793a\u5f53\u524d\u7f13\u51b2\u6c60\u4e2d\u5185\u5b58\u9875\u7684\u6570\u91cf\uff0c\u5185\u5b58\u6c60\u7684\u5927\u5c0f=Buffer pool size*16KB\nFree buffers       1025  \/\/\u8868\u793a\u5f53\u524dFREE\u5217\u8868\u4e2d\u9875\u7684\u6570\u91cf\uff1b\nDatabase pages     6985  \/\/LRU\u5217\u8868\u4e2d\u9875\u7684\u6570\u91cf\uff1b\nOld database pages 2558  \/\/\nModified db pages  0     \/\/\u663e\u793a\u4e86\u810f\u9875\u7684\u6570\u91cf\uff1b\nPending reads      0\nPending writes: LRU 0, flush list 0, single page 0\nPages made young 4656751, not young 61021911  \/\/\u8868\u793a\u662f\u5426\u53d1\u751f\u4e86\u9875\u5728LRU\u961f\u5217\u4e0a\u7684\u79fb\u52a8\uff1b\n0.00 youngs\/s, 0.00 non-youngs\/s   \/\/\u8868\u793a\u6bcf\u79d2\u4e24\u7c7b\u64cd\u4f5c\u53d1\u751f\u7684\u6b21\u6570\uff1b\nPages read 1036977, created 686192, written 21243071\n0.00 reads\/s, 0.00 creates\/s, 0.28 writes\/s\n\/\/\u8868\u793a\u7f13\u51b2\u6c60\u7684\u547d\u4e2d\u7387\uff0c\u6b63\u5e38\u60c5\u51b5\u4e0b\u547d\u4e2d\u7387\u5982\u679c\u4f4e\u4e8e95%\uff0c\u5219\u9700\u8981\u89c2\u5bdf\u662f\u5426\u56e0\u4e3a\u5168\u8868\u626b\u63cf\u5f15\u8d77\u4e86LRU\u961f\u5217\u88ab\u6c61\u67d3\u7684\u95ee\u9898\nBuffer pool hit rate 1000 \/ 1000, young-making rate 0 \/ 1000 not 0 \/ 1000 \nPages read ahead 0.00\/s, evicted without access 0.00\/s, Random read ahead 0.00\/s\nLRU len: 6985, unzip_LRU len: 0\nI\/O sum[17]:cur[0], unzip sum[0]:cur[0]<\/code><\/pre>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000043990807\" alt=\"\" title=\"\" loading=\"lazy\">[]()<\/p>\n<ul>\n<li>\u9875\u538b\u7f29\u529f\u80fd<\/li>\n<\/ul>\n<p>InnoDB\u5b58\u50a8\u5f15\u64ce\u4ece1.0.x\u7248\u672c\u5f00\u59cb\u652f\u6301\u538b\u7f29\u9875\u7684\u529f\u80fd\uff0c\u5373\u5c06\u539f\u672c16KB\u7684\u9875\u538b\u7f29\u4e3a1KB\u30012KB\u30014KB\u548c8KB\u3002\u800c\u7531\u4e8e\u9875\u7684\u5927\u5c0f\u53d1\u751f\u4e86\u53d8\u5316\uff0cLRU\u5217\u8868\u4e5f\u6709\u4e86\u4e9b\u8bb8\u7684\u6539\u53d8\u3002\u5bf9\u4e8e\u975e16KB\u7684\u9875\uff0c\u662f\u901a\u8fc7unzip_LRU\u5217\u8868\u8fdb\u884c\u7ba1\u7406\u7684\uff0cLRU\u4e2d\u7684\u9875\u5305\u542b\u4e86unzip_LRU\u5217\u8868\u4e2d\u7684\u9875\u3002<\/p>\n<p>\u5bf9\u4e8e\u538b\u7f29\u9875\u7684\u8868\uff0c\u6bcf\u4e2a\u8868\u7684\u538b\u7f29\u6bd4\u7387\u53ef\u80fd\u5404\u4e0d\u76f8\u540c\u3002\u53ef\u80fd\u5b58\u5728\u6709\u7684\u8868\u9875\u5927\u5c0f\u4e3a8KB\uff0c\u6709\u7684\u8868\u9875\u5927\u5c0f\u4e3a2KB\u7684\u60c5\u51b5\u3002unzip_LRU\u662f\u600e\u6837\u4ece\u7f13\u51b2\u6c60\u4e2d\u5206\u914d\u5185\u5b58\u7684\u5462\uff1f<\/p>\n<p>\u9996\u5148\uff0c\u5728unzip_LRU\u5217\u8868\u4e2d\u5bf9\u4e0d\u540c\u538b\u7f29\u9875\u5927\u5c0f\u7684\u9875\u8fdb\u884c\u5206\u522b\u7ba1\u7406\u3002\u5176\u6b21\uff0c\u901a\u8fc7\u4f19\u4f34\u7b97\u6cd5\u8fdb\u884c\u5185\u5b58\u7684\u5206\u914d\u3002\u4f8b\u5982\u5bf9\u9700\u8981\u4ece\u7f13\u51b2\u6c60\u4e2d\u7533\u8bf7\u9875\u4e3a4KB\u7684\u5927\u5c0f\uff0c\u5176\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li>\u68c0\u67e54KB\u7684unzip_LRU\u5217\u8868\uff0c\u68c0\u67e5\u662f\u5426\u6709\u53ef\u7528\u7684\u7a7a\u95f2\u9875\uff1b<\/li>\n<li>\u82e5\u6709\uff0c\u5219\u76f4\u63a5\u4f7f\u7528\uff1b<\/li>\n<li>\u5426\u5219\uff0c\u68c0\u67e58KB\u7684unzip_LRU\u5217\u8868\uff1b<\/li>\n<li>\u82e5\u80fd\u591f\u5f97\u5230\u7a7a\u95f2\u9875\uff0c\u5c06\u9875\u5206\u62102\u4e2a4KB\u9875\uff0c\u5b58\u653e\u52304KB\u7684unzip_LRU\u5217\u8868\uff1b<\/li>\n<li>\u82e5\u4e0d\u80fd\u5f97\u5230\u7a7a\u95f2\u9875\uff0c\u4eceLRU\u5217\u8868\u4e2d\u7533\u8bf7\u4e00\u4e2a16KB\u7684\u9875\uff0c\u5c06\u9875\u5206\u4e3a1\u4e2a8KB\u7684\u9875\u30012\u4e2a4KB\u7684\u9875\uff0c\u5206\u522b\u5b58\u653e\u5230\u5bf9\u5e94\u7684unzip_LRU\u5217\u8868\u4e2d\u3002<\/li>\n<\/ul>\n<p>2\uff09Free List\uff1a<\/p>\n<p>free list \u5b9a\u4e49\u662f\u5f53\u524d\u6ca1\u6709\u88ab\u4f7f\u7528\u7684\u5185\u5b58\u9875\uff0c\u4e5f\u5c31\u662f\u7a7a\u95f2\u7684\u5185\u5b58\u9875\uff0c\u5f53\u6267\u884c\u67e5\u8be2\u64cd\u4f5c\u65f6\uff0c\u5982\u679c\u9875\u5df2\u7ecf\u5728 buffer pool \u4e2d\u4e86\uff0c\u5219\u67e5\u8be2\u5230\u76f4\u63a5\u8fd4\u56de\uff0c\u5982\u679c\u6ca1\u6709\u5728 buffer pool\uff0c\u5e76\u4e14 free list \u4e0d\u4e3a\u7a7a\uff0c\u5219\u4f1a\u4ece\u78c1\u76d8\u4e2d\u67e5\u8be2\u5bf9\u5e94\u7684\u6570\u636e\uff0c\u653e\u5165 free list \u7684\u67d0\u4e00\u9875\u4e2d\uff0c\u5e76\u4e14\u628a\u8fd9\u9875\u4ece free list \u4e2d\u79fb\u9664\uff0c\u653e\u5165 LRU \u961f\u5217\u4e2d\u3002Flush List\u4e2d\u7684\u810f\u9875\u5728\u6267\u884c\u4e86\u5237\u76d8\u64cd\u4f5c\u540e\u4f1a\u5c06\u7a7a\u95f4\u8fd8\u7ed9Free List\uff0c\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\u53ef\u4ee5\u89e3\u51b3\u7a7a\u95f4\u788e\u7247\u5316<\/p>\n<p>LRU\u5217\u8868\u7528\u6765\u7ba1\u7406\u5df2\u7ecf\u8bfb\u53d6\u7684\u9875\uff0c\u4f46\u5f53\u6570\u636e\u5e93\u521a\u542f\u52a8\u65f6\uff0cLRU\u5217\u8868\u662f\u7a7a\u7684\uff0c\u5373\u6ca1\u6709\u4efb\u4f55\u7684\u9875\u3002\u8fd9\u65f6\u9875\u90fd\u5b58\u653e\u5728Free\u5217\u8868\u4e2d\u3002\u5f53\u9700\u8981\u4ece\u7f13\u51b2\u6c60\u4e2d\u5206\u9875\u65f6\uff0c\u9996\u5148\u4eceFree\u5217\u8868\u4e2d\u67e5\u627e\u662f\u5426\u6709\u53ef\u7528\u7684\u7a7a\u95f2\u9875\uff0c\u82e5\u6709\u5219\u5c06\u8be5\u9875\u4eceFree\u5217\u8868\u4e2d\u5220\u9664\uff0c\u653e\u5165\u5230LRU\u5217\u8868\u4e2d\u3002\u5426\u5219\uff0c\u6839\u636eLRU\u7b97\u6cd5\uff0c\u6dd8\u6c70LRU\u5217\u8868\u672b\u5c3e\u7684\u9875\uff0c\u5c06\u8be5\u5185\u5b58\u7a7a\u95f4\u5206\u914d\u7ed9\u65b0\u7684\u9875\u3002<\/p>\n<p>\u4ece\u4e0a\u9762\u53ef\u4ee5\u770b\u51fa \u3010SHOW ENGINE INNODB STATUS\u3011 :<\/p>\n<ul>\n<li>Free buffers\u8868\u793a\u5f53\u524dFree\u5217\u8868\u4e2d\u9875\u7684\u6570\u91cf\uff0cDatabase pages\u8868\u793aLRU\u5217\u8868\u4e2d\u9875\u7684\u6570\u91cf\u3002\u53ef\u80fd\u7684\u60c5\u51b5\u662fFree buffers\u4e0eDatabase pages\u7684\u6570\u91cf\u4e4b\u548c\u4e0d\u7b49\u4e8eBuffer pool size\u3002\u56e0\u4e3a\u7f13\u51b2\u6c60\u4e2d\u7684\u9875\u8fd8\u53ef\u80fd\u4f1a\u88ab\u5206\u914d\u7ed9\u81ea\u9002\u5e94\u54c8\u5e0c\u7d22\u5f15\u3001Lock\u4fe1\u606f\u3001Change Buffer\u7b49\u9875\uff0c\u800c\u8fd9\u90e8\u5206\u9875\u4e0d\u9700\u8981LRU\u7b97\u6cd5\u8fdb\u884c\u7ef4\u62a4\uff0c\u56e0\u6b64\u4e0d\u5b58\u5728\u4e8eLRU\u5217\u8868\u4e2d\u3002<\/li>\n<li>pages made young\u663e\u793a\u4e86LRU\u5217\u8868\u4e2d\u9875\u79fb\u52a8\u5230\u524d\u7aef\u7684\u6b21\u6570\uff0cyoungs\/s\u3001non-youngs\/s\u8868\u793a\u6bcf\u79d2\u8fd9\u4e24\u7c7b\u64cd\u4f5c\u7684\u6b21\u6570\u3002<\/li>\n<li>\u8fd9\u91cc\u8fd8\u6709\u4e00\u4e2a\u91cd\u8981\u7684\u89c2\u5bdf\u53d8\u91cf\u2014\u2014Buffer pool hit rate\uff0c\u8868\u793a\u7f13\u51b2\u6c60\u7684\u547d\u4e2d\u7387\uff0c\u901a\u5e38\u8be5\u503c\u4e0d\u5e94\u8be5\u5c0f\u4e8e95%\u3002\u82e5\u53d1\u751fBuffer pool hit rate\u7684\u503c\u5c0f\u4e8e95%\u8fd9\u79cd\u60c5\u51b5\uff0c\u7528\u6237\u9700\u8981\u89c2\u5bdf\u662f\u5426\u662f\u7531\u4e8e\u5168\u8868\u626b\u63cf\u5f15\u8d77\u7684LRU\u5217\u8868\u88ab\u6c61\u67d3\u7684\u95ee\u9898\u3002<\/li>\n<\/ul>\n<p>3\uff09Flush List\uff1a<\/p>\n<p>\u5728LRU\u5217\u8868\u4e2d\u7684\u9875\u88ab\u4fee\u6539\u540e\uff0c\u79f0\u8be5\u9875\u4e3a\u810f\u9875\uff08dirty page\uff09\uff0c\u5373\u7f13\u51b2\u6c60\u4e2d\u7684\u9875\u548c\u78c1\u76d8\u4e0a\u7684\u9875\u7684\u6570\u636e\u4ea7\u751f\u4e86\u4e0d\u4e00\u81f4\u3002\u8fd9\u65f6\u6570\u636e\u5e93\u4f1a\u901a\u8fc7CHECKPOINT\u673a\u5236\u5c06\u810f\u9875\u5237\u65b0\u56de\u78c1\u76d8\uff0c\u800cFlush\u5217\u8868\u4e2d\u7684\u9875\u5373\u4e3a\u810f\u9875\u5217\u8868\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u810f\u9875\u65e2\u5b58\u5728\u4e8eLRU\u5217\u8868\u4e2d\uff0c\u4e5f\u5b58\u5728\u4e8eFlush\u5217\u8868\u4e2d\u3002LRU\u5217\u8868\u7528\u6765\u7ba1\u7406\u7f13\u51b2\u6c60\u4e2d\u9875\u7684\u53ef\u7528\u6027\uff0cFlush\u5217\u8868\u7528\u6765\u7ba1\u7406\u5c06\u9875\u5237\u65b0\u56de\u78c1\u76d8\uff0c\u4e8c\u8005\u4e92\u4e0d\u5f71\u54cd\u3002<\/p>\n<p>Flush List\u4e2d\u7684\u810f\u9875\u5728\u6267\u884c\u4e86\u5237\u76d8\u64cd\u4f5c\u540e\u4f1a\u5c06\u7a7a\u95f4\u8fd8\u7ed9Free List\u3002<\/p>\n<p>\u540cLRU\u5217\u8868\u4e00\u6837\uff0cFlush\u5217\u8868\u4e5f\u53ef\u4ee5\u901a\u8fc7\u547d\u4ee4SHOW ENGINE INNODB STATUS\u6765\u67e5\u770b\uff0c\u524d\u9762\u4f8b\u5b50\u4e2dModified db pages \u5c31\u663e\u793a\u4e86\u810f\u9875\u7684\u6570\u91cf\u3002<\/p>\n<p>2.Checkpoint\u6280\u672f<\/p>\n<p>\u6570\u636e\u5e93\u5728\u53d1\u751f\u589e\u5220\u67e5\u6539\u64cd\u4f5c\u7684\u65f6\u5019\uff0c\u90fd\u662f\u5148\u5728buffer pool\u4e2d\u5b8c\u6210\u7684\uff0c\u4e3a\u4e86\u63d0\u9ad8\u4e8b\u7269\u64cd\u4f5c\u7684\u6548\u7387\uff0cbuffer pool\u4e2d\u4fee\u6539\u4e4b\u540e\u7684\u6570\u636e\uff0c\u5e76\u6ca1\u6709\u7acb\u5373\u5199\u5165\u5230\u78c1\u76d8\uff0c\u8fd9\u6709\u53ef\u80fd\u4f1a\u5bfc\u81f4\u5185\u5b58\u4e2d\u6570\u636e\u4e0e\u78c1\u76d8\u4e2d\u7684\u6570\u636e\u4ea7\u751f\u4e0d\u4e00\u81f4\u7684\u60c5\u51b5\u3002<\/p>\n<p>\u5018\u82e5\u6bcf\u6b21\u4e00\u4e2a\u9875\u7684\u53d8\u5316\uff0c\u5c31\u5c06\u65b0\u9875\u7684\u7248\u672c\u5237\u65b0\u5230\u78c1\u76d8\uff0c\u90a3\u4e48\u8fd9\u4e2a\u5f00\u9500\u662f\u975e\u5e38\u5927\u7684\uff0c\u82e5\u70ed\u70b9\u6570\u636e\u96c6\u4e2d\u5728\u67d0\u51e0\u4e2a\u9875\u4e2d\uff0c\u90a3\u4e48\u6570\u636e\u5e93\u7684\u6027\u80fd\u5c31\u4f1a\u53d8\u5f97\u975e\u5e38\u5dee\u3002\u540c\u65f6\uff0c\u5982\u679c\u5728\u4ece\u7f13\u51b2\u6c60\u5c06\u9875\u7684\u7684\u65b0\u7248\u672c\u5237\u65b0\u5230\u78c1\u76d8\u65f6\u53d1\u751f\u4e86\u5b95\u673a\uff0c\u90a3\u4e48\u6570\u636e\u5c31\u4e0d\u80fd\u6062\u590d\u4e86\uff0c\u4e3a\u4e86\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff0c\u5f53\u524d\u4e8b\u52a1\u6570\u636e\u5e93\u7cfb\u7edf\u666e\u904d\u90fd\u91c7\u7528\u4e86Write Ahead Log\u7b56\u7565\uff0c\u5373\u5f53\u4e8b\u52a1\u63d0\u4ea4\u65f6\uff0c\u5148\u5199\u91cd\u505a\u65e5\u5fd7\uff0c\u518d\u4fee\u6539\u9875\uff0c\u5f53\u7531\u4e8e\u53d1\u751f\u5b95\u673a\u800c\u5bfc\u81f4\u6570\u636e\u4e22\u5931\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7\u91cd\u505a\u65e5\u5fd7\u6765\u5b8c\u6210\u6570\u636e\u7684\u6062\u590d\u3002\u8fd9\u4e5f\u662f\u4e8b\u52a1ACID\u4e2dD\uff08Durability\u6301\u4e45\u6027\uff09\u7684\u8981\u6c42\u3002<\/p>\n<p>checkpoint\u7684\u4f5c\u7528\uff1a<\/p>\n<ul>\n<li>\u7f29\u77ed\u6570\u636e\u5e93\u7684\u6062\u590d\u65f6\u95f4<\/li>\n<li>\u7f13\u51b2\u6c60\u4e0d\u591f\u7528\u65f6\uff0c\u5c06\u810f\u9875\u5237\u65b0\u5230\u78c1\u76d8<\/li>\n<li>\u91cd\u505a\u65e5\u5fd7\u4e0d\u53ef\u7528\u65f6\uff0c\u5237\u65b0\u810f\u9875  <br \/>checkpoint\u7684\u5206\u7c7b<\/li>\n<li>sharp checkpoint\uff1a\u5728\u5173\u95ed\u6570\u636e\u5e93\u7684\u65f6\u5019\uff0c\u5c06buffer pool\u4e2d\u7684\u810f\u9875\u5168\u90e8\u5237\u65b0\u5230\u78c1\u76d8\u4e2d\u3002<\/li>\n<li>fuzzy checkpoint\uff1a\u6570\u636e\u5e93\u6b63\u5e38\u8fd0\u884c\u65f6\uff0c\u5728\u4e0d\u540c\u7684\u65f6\u673a\uff0c\u5c06\u90e8\u5206\u810f\u9875\u5199\u5165\u78c1\u76d8\uff0c\u8fdb\u5237\u65b0\u90e8\u5206\u810f\u9875\u5230\u78c1\u76d8\uff0c\u4e5f\u662f\u4e3a\u4e86\u907f\u514d\u4e00\u6b21\u5237\u65b0\u5168\u90e8\u7684\u810f\u9875\u9020\u6210\u7684\u6027\u80fd\u95ee\u9898\u3002<\/li>\n<\/ul>\n<h4>2.2.2 \u5199\u7f13\u51b2 Change Buffer<\/h4>\n<p>\u5728MySQL5.5\u4e4b\u524d\uff0c\u53eb\u63d2\u5165\u7f13\u51b2\uff08Insert Buffer\uff09\uff0c\u53ea\u9488\u5bf9INSERT\u505a\u4e86\u4f18\u5316\uff1b\u73b0\u5728\u5bf9DELETE\u548cUPDATE\u4e5f\u6709\u6548\uff0c\u53eb\u505a\u5199\u7f13\u51b2\uff08Change Buffer\uff09\u3002\u5b83\u662f\u4e00\u79cd\u5e94\u7528\u5728\u975e\u552f\u4e00\u666e\u901a\u7d22\u5f15\u9875\uff08non-unique secondary index page\uff09\u4e0d\u5728\u7f13\u51b2\u6c60\u4e2d\uff0c\u5bf9\u9875\u8fdb\u884c\u4e86\u5199\u64cd\u4f5c\uff0c\u5e76\u4e0d\u4f1a\u7acb\u523b\u5c06\u78c1\u76d8\u9875\u52a0\u8f7d\u5230\u7f13\u51b2\u6c60\uff0c\u800c\u4ec5\u4ec5\u8bb0\u5f55\u7f13\u51b2\u53d8\u66f4\uff08Buffer Changes\uff09\uff0c\u7b49\u672a\u6765\u6570\u636e\u88ab\u8bfb\u53d6\u65f6\uff0c\u518d\u5c06\u6570\u636e\u5408\u5e76\uff08Merge\uff09\u6062\u590d\u5230\u7f13\u51b2\u6c60\u4e2d\u7684\u6280\u672f\u3002\u5199\u7f13\u51b2\u7684\u76ee\u7684\u662f\u964d\u4f4e\u5199\u64cd\u4f5c\u7684\u78c1\u76d8IO\uff0c\u63d0\u5347\u6570\u636e\u5e93\u6027\u80fd\u3002<\/p>\n<p>\u6570\u636e\u7684\u4fee\u6539\u5206\u4e3a\u4e24\u4e2a\u60c5\u51b5\uff1a<\/p>\n<p>1.\u5f53\u4fee\u6539\u7684\u6570\u636e\u9875\u5728\u7f13\u51b2\u6c60\u65f6<\/p>\n<p>\u4e0a\u6587\u8bb2\u8fc7\uff0c\u901a\u8fc7LRU\u3001Flush List\u7684\u7ba1\u7406\uff0c\u6570\u636e\u5e93\u4e0d\u662f\u76f4\u63a5\u5199\u5165\u78c1\u76d8\u4e2d\uff0c\u662f\u5148\u5c06redo log\u5199\u5165\u5230\u78c1\u76d8\uff0c\u518d\u901a\u8fc7checkpoint\u673a\u5236\uff0c\u5c06\u8fd9\u4e9b\u201c\u810f\u6570\u636e\u9875\u201d\u540c\u6b65\u5730\u5199\u5165\u78c1\u76d8\uff0c\u7b49\u4e8e\u662f\u5c06\u8fd9\u671f\u95f4\u53d1\u751f\u7684n\u6b21\u7684\u843d\u76d8\u5408\u5e76\u6210\u4e86\u4e00\u6b21\u843d\u76d8\u3002\u56e0\u4e3a\u6709redo log\u662f\u843d\u76d8\u7684\uff0c\u6240\u4ee5\u5373\u4f7f\u6570\u636e\u5e93\u5d29\u6e83\uff0c\u7f13\u5b58\u4e2d\u7684\u6570\u636e\u9875\u5168\u90e8\u4e22\u5931\uff0c\u4e5f\u53ef\u4ee5\u901a\u8fc7redo log\u5c06\u8fd9\u4e9b\u6570\u636e\u9875\u627e\u56de\u6765\u3002<\/p>\n<p>redo log\u662f\u6570\u636e\u5e93\u7528\u6765\u5728\u5d29\u6e83\u7684\u65f6\u5019\u8fdb\u884c\u6570\u636e\u6062\u590d\u7684\u65e5\u5fd7\uff0credo log\u7684\u5199\u5165\u7b56\u7565\u53ef\u4ee5\u901a\u8fc7\u53c2\u6570\u63a7\u5236\uff0c\u5e76\u4e0d\u4e00\u5b9a\u662f\u6bcf\u4e00\u6b21\u5199\u64cd\u4f5c\u4e4b\u540e\u7acb\u5373\u843d\u76d8redo log\uff0c\u5728\u90e8\u5206\u53c2\u6570\u4e0b\uff0credo log\u53ef\u80fd\u662f\u6bcf\u79d2\u96c6\u4e2d\u5199\u5165\u4e00\u6b21\uff0c\u4e5f\u6709\u53ef\u80fd\u91c7\u53d6\u5176\u4ed6\u843d\u76d8\u7b56\u7565\uff0c\u4f46\u662f\u65e0\u8bba\u91c7\u7528\u4ec0\u4e48\u65b9\u5f0f\uff0credo log\u7684\u91cf\u90fd\u662f\u4e0d\u4f1a\u51cf\u5c11\u7684\uff0c\u4e0e\u6570\u636e\u5199\u5165\u7684\u8986\u76d6\u6027\u4e0d\u540c\uff0c\u540e\u4e00\u6761redo log\u662f\u4e0d\u4f1a\u8986\u76d6\u524d\u4e00\u6761\u7684\uff0c\u800c\u662f\u589e\u91cf\u5f62\u5f0f\u7684\uff0c\u56e0\u6b64\u5199redo log\u7684\u64cd\u4f5c\uff0c\u7b49\u540c\u4e8e\u662f\u5bf9\u78c1\u76d8\u67d0\u4e00\u5c0f\u5757\u533a\u57df\u7684\u987a\u5e8fI\/O\uff0c\u800c\u4e0d\u50cf\u6570\u636e\u843d\u76d8\u4e00\u6837\u7684\u968f\u673aIO\u5728\u78c1\u76d8\u91cc\u5199\u5165\uff0c\u9700\u8981\u78c1\u76d8\u5728\u591a\u4e2a\u5730\u65b9\u79fb\u52a8\u78c1\u5934\u3002\u6240\u4ee5redo log\u7684\u843d\u76d8\u662fIO\u64cd\u4f5c\u5f53\u4e2d\u6d88\u8017\u8f83\u5c11\u7684\u4e00\u79cd\uff0c\u6bd4\u6570\u636e\u76f4\u63a5\u5237\u56de\u78c1\u76d8\u8981\u4f18\u5f88\u591a\u3002<\/p>\n<p>2.\u5f53\u4fee\u6539\u7684\u6570\u636e\u9875\u4e0d\u5728\u7f13\u51b2\u6c60\u65f6\uff0c\u4e0d\u7528\u5199\u7f13\u51b2\u81f3\u5c11\u9700\u8981\u4e0b\u9762\u7684\u4e09\u6b65\uff1a<\/p>\n<ul>\n<li>\u5148\u628a\u9700\u8981\u7684\u7d22\u5f15\u9875\uff0c\u4ece\u78c1\u76d8\u52a0\u8f7d\u5230\u7f13\u51b2\u6c60\uff0c\u4e00\u6b21\u78c1\u76d8\u968f\u673a\u8bfb\u64cd\u4f5c\uff1b<\/li>\n<li>\u4fee\u6539\u7f13\u51b2\u6c60\u4e2d\u7684\u9875\uff0c\u4e00\u6b21\u5185\u5b58\u64cd\u4f5c\uff1b<\/li>\n<li>\u5199\u5165 redo log \uff0c\u4e00\u6b21\u78c1\u76d8\u987a\u5e8f\u5199\u64cd\u4f5c\uff1b<\/li>\n<\/ul>\n<p>\u5728\u6ca1\u6709\u547d\u4e2d\u7f13\u51b2\u6c60\u7684\u65f6\u5019\uff0c\u81f3\u5c11\u591a\u4ea7\u751f\u4e00\u6b21\u78c1\u76d8IO\uff0c\u5bf9\u4e8e\u5199\u591a\u8bfb\u5c11\u7684\u4e1a\u52a1\u573a\u666f\uff0c\u6027\u80fd\u635f\u8017\u662f\u5f88\u9ad8\u7684<\/p>\n<p>\u52a0\u5165\u5199\u7f13\u51b2\u4f18\u5316\u540e\uff0c\u6d41\u7a0b\u4f18\u5316\u4e3a\uff1a<\/p>\n<ul>\n<li>\u5728\u5199\u7f13\u51b2\u4e2d\u8bb0\u5f55\u8fd9\u4e2a\u64cd\u4f5c\uff0c\u4e00\u6b21\u5185\u5b58\u64cd\u4f5c\uff1b<\/li>\n<li>\u5199\u5165redo log\uff0c\u4e00\u6b21\u78c1\u76d8\u987a\u5e8f\u5199\u64cd\u4f5c\uff1b<\/li>\n<\/ul>\n<p>\u5176\u6027\u80fd\u4e0e\u8fd9\u4e2a\u7d22\u5f15\u9875\u5728\u7f13\u51b2\u6c60\u4e2d\uff0c\u76f8\u8fd1\u3002<\/p>\n<p>3.\u5982\u4f55\u4fdd\u8bc1\u6570\u636e\u7684\u4e00\u81f4\u6027\uff1f<\/p>\n<ul>\n<li>\u6570\u636e\u5e93\u5f02\u5e38\u5954\u6e83\uff0c\u80fd\u591f\u4eceredo log\u4e2d\u6062\u590d\u6570\u636e\uff1b<\/li>\n<li>\u5199\u7f13\u51b2\u4e0d\u53ea\u662f\u4e00\u4e2a\u5185\u5b58\u7ed3\u6784\uff0c\u5b83\u4e5f\u4f1a\u88ab\u5b9a\u671f\u5237\u76d8\u5230\u5199\u7f13\u51b2\u7cfb\u7edf\u8868\u7a7a\u95f4\uff1b<\/li>\n<li>\u6570\u636e\u8bfb\u53d6\u65f6\uff0c\u6709\u53e6\u5916\u7684\u6d41\u7a0b\uff0c\u5c06\u6570\u636e\u5408\u5e76\u5230\u7f13\u51b2\u6c60\uff1b<\/li>\n<\/ul>\n<p>\u4e0b\u4e00\u6b21\u8bfb\u5230\u8be5\u7d22\u5f15\u9875\uff1a<\/p>\n<ul>\n<li>\u8f7d\u5165\u7d22\u5f15\u9875\uff0c\u7f13\u51b2\u6c60\u672a\u547d\u4e2d\uff0c\u8fd9\u6b21\u78c1\u76d8IO\u4e0d\u53ef\u907f\u514d\uff1b<\/li>\n<li>\u4ece\u5199\u7f13\u51b2\u8bfb\u53d6\u76f8\u5173\u4fe1\u606f\uff1b<\/li>\n<li>\u6062\u590d\u7d22\u5f15\u9875\uff0c\u653e\u5230\u7f13\u51b2\u6c60LRU\u548cFlush\u91cc\uff1b\uff08\u5728\u771f\u6b63\u88ab\u8bfb\u53d6\u65f6\uff0c\u624d\u4f1a\u88ab\u52a0\u8f7d\u5230\u7f13\u51b2\u6c60\u4e2d\uff09<\/li>\n<\/ul>\n<p>4.\u4e3a\u4ec0\u4e48\u5199\u7f13\u51b2\u4f18\u5316\uff0c\u4ec5\u9002\u7528\u4e8e\u975e\u552f\u4e00\u666e\u901a\u7d22\u5f15\u9875\u5462\uff1f<\/p>\n<p>InnoDB\u91cc\u6709\u805a\u96c6\u7d22\u5f15\uff08Clustered Index\uff09)\u548c\u666e\u901a\u7d22\u5f15(Secondary Index)\u4e24\u79cd\u3002\u5982\u679c\u7d22\u5f15\u8bbe\u7f6e\u4e86\u552f\u4e00\uff08Unique\uff09\u5c5e\u6027\uff0c\u5728 \u8fdb\u884c\u4fee\u6539\u64cd\u4f5c \u65f6\uff0c InnoDB\u5fc5\u987b\u8fdb\u884c\u552f\u4e00\u6027\u68c0\u67e5 \u3002\u4e5f\u5c31\u662f\u8bf4\uff0c \u7d22\u5f15\u9875\u5373\u4f7f\u4e0d\u5728\u7f13\u51b2\u6c60\uff0c\u78c1\u76d8\u4e0a\u7684\u9875\u8bfb\u53d6\u65e0\u6cd5\u907f\u514d\uff08\u5426\u5219\u600e\u4e48\u6821\u9a8c\u662f\u5426\u552f\u4e00\uff01\uff1f\uff09<\/p>\n<p>\u6b64\u65f6\u5c31\u5e94\u8be5\u76f4\u63a5\u628a\u76f8\u5e94\u7684\u9875\u653e\u5165\u7f13\u51b2\u6c60\u518d\u8fdb\u884c\u4fee\u6539\u3002<\/p>\n<p>5.\u9664\u4e86\u6570\u636e\u9875\u88ab\u8bbf\u95ee\uff0c\u8fd8\u6709\u54ea\u4e9b\u573a\u666f\u4f1a\u89e6\u53d1\u5237\u5199\u7f13\u51b2\u4e2d\u7684\u6570\u636e\u5462\uff1f<\/p>\n<ul>\n<li>\u6709\u4e00\u4e2a\u540e\u53f0\u7ebf\u7a0b\uff0c\u4f1a\u8ba4\u4e3a\u6570\u636e\u5e93\u7a7a\u95f2\u65f6\uff1b<\/li>\n<li>\u6570\u636e\u5e93\u7f13\u51b2\u6c60\u4e0d\u591f\u7528\u65f6\uff1b<\/li>\n<li>\u6570\u636e\u5e93\u6b63\u5e38\u5173\u95ed\u65f6\uff1b<\/li>\n<li>redo log\u5199\u6ee1\u65f6\uff1b\uff08\u51e0\u4e4e\u4e0d\u4f1a\u51fa\u73b0redo log\u5199\u6ee1\uff0c\u6b64\u65f6\u6574\u4e2a\u6570\u636e\u5e93\u5904\u4e8e\u65e0\u6cd5\u5199\u5165\u7684\u4e0d\u53ef\u7528\u72b6\u6001\uff09<\/li>\n<\/ul>\n<p>6.\u4ec0\u4e48\u4e1a\u52a1\u573a\u666f\uff0c\u9002\u5408\u5f00\u542fInnoDB\u7684\u5199\u7f13\u51b2\u673a\u5236\uff1f<\/p>\n<ul>\n<li>\u6570\u636e\u5e93\u5927\u90e8\u5206\u662f\u975e\u552f\u4e00\u7d22\u5f15\uff1b<\/li>\n<li>\u4e1a\u52a1\u662f\u5199\u591a\u8bfb\u5c11\uff0c\u6216\u8005\u4e0d\u662f\u5199\u540e\u7acb\u523b\u8bfb\u53d6\uff1b<\/li>\n<\/ul>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000043990808\" alt=\"\" title=\"\" loading=\"lazy\">[]()<\/p>\n<pre><code>SHOW VARIABLES LIKE 'innodb_change_buffer_max_size'<\/code><\/pre>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000043990809\" alt=\"\" title=\"\" loading=\"lazy\">[]()<\/p>\n<h4>2.2.3 \u81ea\u9002\u5e94\u6563\u5217\u7d22\u5f15 Adaptive Hash Index<\/h4>\n<p>\u81ea\u9002\u5e94\u54c8\u5e0c\u7d22\u5f15\u7528\u4e8e\u4f18\u5316\u5bf9BP\u6570\u636e\u7684\u67e5\u8be2\u3002InnoDB\u5b58\u50a8\u5f15\u64ce\u4f1a\u76d1\u63a7\u5bf9\u4e8c\u7ea7\u7d22\u5f15\u6570\u636e\u7684\u67e5\u627e\uff0c\u5982\u679c\u89c2\u5bdf\u5230\u5efa\u7acb\u54c8\u5e0c\u7d22\u5f15\u53ef\u4ee5\u5e26\u6765\u901f\u5ea6\u7684\u63d0\u5347(\u6700\u8fd1\u8fde\u7eed\u88ab\u8bbf\u95ee\u4e09\u6b21\u7684\u6570\u636e)\uff0c\u5219\u5efa\u7acb\u54c8\u5e0c\u7d22\u5f15\uff0c\u81ea\u9002\u5e94\u54c8\u5e0c\u7d22\u5f15\u901a\u8fc7\u7f13\u51b2\u6c60\u7684B+\u6811\u6784\u9020\u800c\u6765\uff0c\u56e0\u6b64\u5efa\u7acb\u7684\u901f\u5ea6\u5f88\u5feb\u3002InnoDB\u5b58\u50a8\u5f15\u64ce\u4f1a\u81ea\u52a8\u6839\u636e\u8bbf\u95ee\u7684\u9891\u7387\u548c\u6a21\u5f0f\u6765\u4e3a\u67d0\u4e9b\u9875\u5efa\u7acb\u54c8\u5e0c\u7d22\u5f15\u3002\uff08\u5728\u9ad8\u8d1f\u8f7d\u7cfb\u7edf\u4e0bAHI\u5bb9\u6613\u4ea7\u751f\u8d44\u6e90\u7684\u4e89\u7528\uff0c\u8fdb\u800c\u5f15\u8d77\u4e00\u4e9bbug\u5bfc\u81f4\u7cfb\u7edf\u53d7\u5f71\u54cd\u751a\u81f3\u5d29\u6e83\uff0c\u6545\u5efa\u8bae\u5173\u95ed\u8be5\u529f\u80fd\uff09<\/p>\n<h4>2.2.4 \u91cd\u505a\u65e5\u5fd7\u7f13\u51b2\u533a rodo Log Buffer<\/h4>\n<p>\u91cd\u505a\u65e5\u5fd7\u7f13\u51b2\u533a\uff0c\u5f53\u5728MySQL\u4e2d\u5bf9InnoDB\u8868\u8fdb\u884c\u6570\u636e\u66f4\u6539\u65f6\uff0c\u8fd9\u4e9b\u66f4\u6539\u9996\u5148\u5b58\u50a8\u5728InnoDB\u65e5\u5fd7\u7f13\u51b2\u533a\u7684\u5185\u5b58\u4e2d\uff0c\u7136\u540e\u518d\u5199\u5165\u91cd\u505a\u65e5\u5fd7\uff08redo logs\uff09\u7684InnoDB\u65e5\u5fd7\u78c1\u76d8\u6587\u4ef6\u4e2d\u3002\u4ed6\u8ba9MySQL\u5728\u5d29\u6e83\u7684\u65f6\u5019\u5177\u6709\u4e86\u6062\u590d\u6570\u636e\u7684\u80fd\u529b\uff0c\u5373\u5728\u6570\u636e\u5e93\u53d1\u751f\u610f\u5916\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u8fdb\u884c\u6570\u636e\u6062\u590d\uff1b<\/p>\n<p>\u65e5\u5fd7\u7f13\u51b2\u533alog buffer\u662f\u5185\u5b58\u5b58\u50a8\u533a\u57df\uff0c\u7528\u4e8e\u4fdd\u5b58\u8981\u5199\u5165\u78c1\u76d8\u4e0a\u7684\u65e5\u5fd7\u6587\u4ef6\u7684\u6570\u636e\u3002\u65e5\u5fd7\u7f13\u51b2\u533a\u5927\u5c0f\u7531innodb_log_buffer_size \u53d8\u91cf\u5b9a\u4e49\uff0c\u9ed8\u8ba4\u5927\u5c0f\u4e3a16MB\u3002<\/p>\n<p>\u65e5\u5fd7\u7f13\u51b2\u533a\u7684\u5185\u5bb9\u5b9a\u671f\u5237\u65b0\u5230\u78c1\u76d8\u3002\u8f83\u5927\u7684\u65e5\u5fd7\u7f13\u51b2\u533a\u53ef\u4ee5\u8fd0\u884c\u5927\u578b\u4e8b\u52a1\uff0c\u800c\u65e0\u9700\u5728\u4e8b\u52a1\u63d0\u4ea4\u4e4b\u524d\u5c06\u91cd\u505a\u65e5\u5fd7\u6570\u636e\u5199\u5165\u78c1\u76d8\u3002\u56e0\u6b64\uff0c\u5982\u679c\u6709\u66f4\u65b0\uff0c\u63d2\u5165\u6216\u5220\u9664\u8bb8\u591a\u884c\u7684\u4e8b\u52a1\uff0c\u5219\u589e\u52a0\u65e5\u5fd7\u7f13\u51b2\u533a\u7684\u5927\u5c0f\u53ef\u4ee5\u8282\u7701\u78c1\u76d8I\/O\u3002<\/p>\n<p>\u8fd9\u91cc\u8fd8\u6d89\u53ca\u5230\u4e00\u4e2a\u53c2\u6570 innodb_flush_log_at_trx_commit \uff1a\u63a7\u5236\u5982\u4f55\u5c06\u65e5\u5fd7\u7f13\u51b2\u533a\u7684\u5185\u5bb9\u5199\u5165\u5e76\u5237\u65b0\u5230\u78c1\u76d8,\u9ed8\u8ba4\u4e3a1\uff0c\u4e0d\u5efa\u8bae\u4fee\u6539<\/p>\n<ol>\n<li>\u53c2\u6570\u4e3a0\u65f6\uff0c\u8868\u793a\u4e8b\u52a1commit\u4e0d\u7acb\u5373\u628a redo log buffer \u91cc\u7684\u6570\u636e\u5237\u5165\u78c1\u76d8\u6587\u4ef6\u7684\uff0c\u800c\u662f\u4f9d\u9760 InnoDB \u7684\u4e3b\u7ebf\u7a0b\u6bcf\u79d2\uff08\u6b64\u65f6\u95f4\u7531\u53c2\u6570innodb_flush_log_at_timeout\u63a7\u5236\uff0c\u9ed8\u8ba41s\uff09\u6267\u884c\u4e00\u6b21\u5237\u65b0\u5230\u78c1\u76d8\u3002\u6b64\u65f6\u53ef\u80fd\u4f60\u63d0\u4ea4\u4e8b\u52a1\u4e86\uff0c\u7ed3\u679c mysql \u5b95\u673a\u4e86\uff0c\u7136\u540e\u6b64\u65f6\u5185\u5b58\u91cc\u7684\u6570\u636e\u5168\u90e8\u4e22\u5931\u3002<\/li>\n<li>\u53c2\u6570\u4e3a1\u65f6\uff0c\u8868\u793a\u4e8b\u52a1commit\u540e\u7acb\u5373\u628a redo log buffer \u91cc\u7684\u6570\u636e\u5199\u5165\u5230os buffer\u4e2d\uff0c\u5e76\u7acb\u5373\u6267\u884cfsync()\u64cd\u4f5c<\/li>\n<li>\u53c2\u6570\u4e3a2\u65f6\uff0c\u8868\u793a\u4e8b\u52a1commit\u540e\u7acb\u5373\u628a redo log buffer \u91cc\u7684\u6570\u636e\u5199\u5165\u5230os buffer\u4e2d\uff0c\u4f46\u4e0d\u7acb\u5373fsync()SQL\u6267\u884c\u8fc7\u7a0b<\/li>\n<\/ol>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000043990810\" alt=\"\" title=\"\" loading=\"lazy\">[]()<\/p>\n<p><strong>\u4ec0\u4e48\u662fbinlog<\/strong><\/p>\n<p>binlog\u662f\u4e00\u4e2a\u4e8c\u8fdb\u5236\u683c\u5f0f\u7684\u6587\u4ef6\uff0c\u7528\u4e8e\u8bb0\u5f55\u7528\u6237\u5bf9\u6570\u636e\u5e93\u66f4\u65b0\u7684SQL\u8bed\u53e5\u4fe1\u606f\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cbinlog\u662f\u4e8c\u8fdb\u5236\u683c\u5f0f\u7684\uff0c\u4e0d\u80fd\u4f7f\u7528\u6587\u672c\u5de5\u5177\u7684\u547d\u4ee4\u8fdb\u884c\u67e5\u770b\uff0c\u800c\u662f\u4f7f\u7528mysqlbinlog\u89e3\u6790\u67e5\u770b\u3002<\/p>\n<p><strong>binlog\u7684\u529f\u80fd<\/strong><\/p>\n<p>\u5f53\u6570\u636e\u5199\u5165\u5230\u6570\u636e\u5e93\u7684\u65f6\u5019\uff0c\u4f1a\u540c\u65f6\u628a\u66f4\u65b0\u7684SQL\u8bed\u53e5\u5199\u5165\u5230\u76f8\u5e94\u7684binlog\u6587\u4ef6\u91cc\u9762\uff0c\u540c\u65f6\u5728\u4f7f\u7528mysqldump\u8fdb\u884c\u5907\u4efd\u7684\u65f6\u5019\uff0c\u53ea\u662f\u5bf9\u4e00\u6bb5\u65f6\u95f4\u7684\u6570\u636e\u8fdb\u884c\u4e86\u5168\u5c40\u5907\u4efd\uff0c\u4f46\u662f\u5982\u679c\u5907\u4efd\u540e\u53d1\u73b0\u6570\u636e\u5e93\u670d\u52a1\u5668\u4ea7\u751f\u6545\u969c\uff0c\u8fd9\u4e2a\u65f6\u5019\u5c31\u8981\u7528\u5230binlog\u65e5\u5fd7\u4e86\u3002<\/p>\n<p><strong>binlog\u548credolog\u7684\u533a\u522b\uff1a<\/strong><\/p>\n<ol>\n<li>redo log\u662f\u5728InnoDB\u5b58\u50a8\u5f15\u64ce\u5c42\u4ea7\u751f\uff0c\u800cbinlog\u662fmysql\u6570\u636e\u5e93\u7684\u4e0a\u5c42\u4ea7\u751f\uff0c\u800c\u4e14binlog\u662f\u4e8c\u8fdb\u5236\u683c\u5f0f\u7684\u65e5\u5fd7\uff0c\u4e0d\u4ec5\u4ec5\u9488\u5bf9InnoDB\u5b58\u50a8\u5f15\u64ce\u3002<\/li>\n<li>\u4e24\u79cd\u65e5\u5fd7\u8bb0\u5f55\u7684\u5185\u5bb9\u5f62\u5f0f\u4e0d\u540c\uff0cMySQL\u7684binlog\u662f\u903b\u8f91\u65e5\u5fd7\uff0c\u800cInnoDB\u5b58\u50a8\u5f15\u64ce\u5c42\u9762\u7684\u91cd\u505a\u65e5\u5fd7\u662f\u7269\u7406\u65e5\u5fd7\u3002<\/li>\n<li>\u4e24\u79cd\u65e5\u5fd7\u4e0e\u8bb0\u5f55\u5199\u5165\u78c1\u76d8\u7684\u65f6\u95f4\u70b9\u4e0d\u540c\uff0c\u4e8c\u8fdb\u5236\u65e5\u5fd7\u53ea\u5728\u4e8b\u7269\u63d0\u4ea4\u5b8c\u6210\u540e\u8fdb\u884c\u4e00\u6b21\u5199\u5165\uff0c\u800credo log\u7684\u91cd\u505a\u65e5\u5fd7\u5728\u4e8b\u7269\u7684\u8fdb\u884c\u8fc7\u7a0b\u4e2d\u4e0d\u65ad\u5730\u88ab\u5199\u5165\u3002<\/li>\n<li>binlog\u4e0d\u662f\u5faa\u73af\u4f7f\u7528\uff0c\u5728\u5199\u6ee1\u6216\u8005\u91cd\u542f\u4e4b\u540e\uff0c\u4f1a\u751f\u6210\u65b0\u7684binlog\u6587\u4ef6\uff0c\u4f46\u662fredo log\u662f\u5faa\u73af\u4f7f\u7528\u7684\u3002<\/li>\n<\/ol>\n<h2>3 InnoDB \u5b58\u50a8\u7279\u6027<\/h2>\n<ol>\n<li>\u5199\u7f13\u51b2 Change Buffer<\/li>\n<li>\u4e24\u6b21\u5199 Double Write<\/li>\n<\/ol>\n<p>InnoDB\u5728\u628aDirty \u810f\u9875\u5199\u56de\u5230\u8868\u7a7a\u95f4\u4e4b\u524d\uff0c\u5728\u5185\u5b58\u4e2d\u4f1a\u7ebf\u62f7\u8d1d\u5230\u8fde\u7eed\u7684\u5185\u5b58\u7a7a\u95f4double write buffer\u7f13\u51b2\u533a\uff0c\u7136\u540e\u518d\u628a\u5b83\u4eec\u5199\u5230\u4e00\u4e2a\u53ebdoublewrite buffer file\u7684\u8fde\u7eed\u78c1\u76d8\u5b58\u50a8\u533a\u57df\u5185\uff0c\u5728\u5199doublewrite buffer file\u5b8c\u6210\u540e\uff0cInnoDB\u624d\u4f1a\u628aDirty pages\u5199\u5230data file\u7684\u9002\u5f53\u7684\u4f4d\u7f6e\u3002\u5982\u679c\u5728\u5199page\u7684\u8fc7\u7a0b\u4e2d\u53d1\u751f\u610f\u5916\u5d29\u6e83\uff0cInnoDB\u5728\u7a0d\u540e\u7684\u6062\u590d\u8fc7\u7a0b\u4e2d\u5728doublewrite buffer file\u4e2d\u627e\u5230\u5b8c\u597d\u7684page\u526f\u672c\u7528\u4e8e\u6062\u590d\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000043990811\" alt=\"\" title=\"\" loading=\"lazy\">[]()<\/p>\n<p><strong>\u4e3a\u4ec0\u4e48\u9700\u8981\u53cc\u5199\uff1f<\/strong><\/p>\n<p>InnoDB \u7684Page Size\u4e00\u822c\u662f16KB\uff0c\u5176\u6570\u636e\u6821\u9a8c\u4e5f\u662f\u9488\u5bf9\u8fd916KB\u6765\u8ba1\u7b97\u7684\uff0c\u5c06\u6570\u636e\u5199\u5165\u5230\u78c1\u76d8\u662f\u4ee5Page\u4e3a\u5355\u4f4d\u8fdb\u884c\u64cd\u4f5c\u7684\u3002\u800c\u8ba1\u7b97\u673a\u786c\u4ef6\u548c\u64cd\u4f5c\u7cfb\u7edf\uff0c\u5199\u6587\u4ef6\u662f\u4ee54KB\uff08512\u5b57\u8282\uff09\u4f5c\u4e3a\u5355\u4f4d\u7684\uff0c\u4e0d\u80fd\u4fdd\u8bc1MySQL\u6570\u636e\u9875\u976216KB\u7684\u4e00\u6b21\u6027\u539f\u5b50\u5199\u3002\u8bd5\u60f3\uff0c\u5728\u67d0\u4e2aDirty Page flush\u7684\u8fc7\u7a0b\u4e2d\uff0c\u53d1\u751f\u4e86\u7cfb\u7edf\u65ad\u7535\uff08\u6216\u8005OS\u5d29\u6e83\uff09\uff0c16K\u7684\u6570\u636e\u53ea\u6709\u90e8\u5206\u88ab\u5199\u5230\u78c1\u76d8\u4e0a\uff0c\u53ea\u6709\u4e00\u90e8\u5206\u5199\u662f\u6210\u529f\u7684\uff0c\u8fd9\u79cd\u73b0\u8c61\u88ab\u79f0\u4e3apartial page writes\u3002\u5728\u51fa\u73b0\u78c1\u76d8\u5d29\u6e83\u7684\u65f6\u5019\uff0cInnoDB \u5f15\u64ce\u4f1a\u4ece\u5171\u4eab\u8868\u7a7a\u95f4\u4e2d\u7684doublewrite\u627e\u5230\u8be5\u9875\u7684\u4e00\u4e2a\u526f\u672c\uff0c\u5c06\u5176\u590d\u5236\u5230\u8868\u7a7a\u95f4\u6587\u4ef6\uff0c\u518d\u5e94\u7528\u91cd\u505a\u65e5\u5fd7\uff0c\u4fdd\u969c InnoDB \u5b58\u50a8\u5f15\u64ce\u64cd\u4f5c\u6570\u636e\u9875\u7684\u53ef\u9760\u6027\u3002<\/p>\n<p><strong>\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u4f7f\u7528redo log \u89e3\u51b3partial page writes\uff1f<\/strong><\/p>\n<p>\u4e00\u65e6partial page writes\u53d1\u751f\uff0c\u90a3\u4e48\u5728InnoDB\u6062\u590d\u65f6\u5c31\u5f88\u5c34\u5c2c\uff1aredo log\u7684\u9875\u5927\u5c0f\u4e00\u822c\u8bbe\u8ba1\u4e3a512\u4e2a\u5b57\u8282\uff0c\u56e0\u6b64redo log page\u672c\u8eab\u4e0d\u4f1a\u53d1\u751fbreak page\u3002\u7528redo log\u6765\u89e3\u51b3partial write \u7406\u8bba\u4e0a\u662f\u53ef\u884c\u7684\uff0c\u4e0d\u8fc7innodb\u7684redo log\u662f\u7269\u7406\u903b\u8f91\u65e5\u5fd7\uff0c\u5e76\u4e0d\u662f\u7eaf\u7269\u7406\u65e5\u5fd7\uff0c\u56e0\u6b64\u53d1\u751fpartial write\u540e\u5d29\u6e83\u6062\u590d\u8fc7\u7a0b\u4e2d\u4e0d\u80fd\u76f4\u63a5\u5e94\u7528redo log \uff0cinnodb\u53d1\u73b0break page\u540e\u5b9e\u9645\u4e0a\u4f1a\u62a5\u9519\u3002\u7269\u7406\u903b\u8f91\u65e5\u5fd7\u4e0d\u662f\u5b8c\u5168\u5e42\u7b49\u7684\uff0c\u8fd9\u53d6\u51b3\u4e8e\u91cd\u505a\u65e5\u5fd7\u7c7b\u578b\uff0c\u5bf9\u4e8eINSERT\u4ea7\u751f\u7684\u65e5\u5fd7\u5176\u4e0d\u662f\u5e42\u7b49\u7684\u3002  <\/p>\n<p><strong> \u4e24\u6b21\u5199\u7684\u5de5\u4f5c\u6d41\u7a0b<\/strong><\/p>\n<p>double write\u7531\u4e24\u90e8\u5206\u7ec4\u6210\uff0c\u4e00\u90e8\u5206\u662fInnoDB\u5185\u5b58\u4e2d\u7684double write buffer\uff0c\u5927\u5c0f\u4e3a2MB\uff0c\u53e6\u4e00\u90e8\u5206\u662f\u7269\u7406\u78c1\u76d8\u4e0a\u7684ibdata\uff0c\u7cfb\u7edf\u8868\u7a7a\u95f4\u4e2d\u5927\u5c0f\u4e3a2MB\uff0c\u5171128\u4e2a\u8fde\u7eed\u7684Page\uff082*1024\/16KB=128\uff09\uff0c\u5373\u4e24\u4e2a\u5206\u533a\uff08extend\uff09\u4e00\u4e2a\u6bb5\uff08segment\uff09\u3002\u5176\u4e2d120\u4e2a\u9875\u7528\u4e8e\u6279\u91cf\u5237\u65b0\u810f\u9875\uff08\u5982LRU LIST\u5237\u65b0\u4e0eFLUSH LIST\u5237\u65b0\u8fd9\u4e24\u79cd\u5237\u65b0\u7b56\u7565\uff09\uff0c\u53e6\u59168\u4e2a\u9875\u7528\u4e8e\u5355\u9875\u5237\u65b0\uff08Single Page Flush\uff09\u3002\u505a\u533a\u5206\u7684\u539f\u56e0\u662f\u6279\u91cf\u5237\u810f\u662f\u540e\u53f0\u7ebf\u7a0b\u505a\u7684\uff0c\u4e0d\u5f71\u54cd\u524d\u53f0\u7ebf\u7a0b\u3002\u800c\u5355\u9875\u5237\u65b0\u662f\u7528\u6237\u7ebf\u7a0b\u53d1\u8d77\u7684\uff0c\u9700\u8981\u5c3d\u5feb\u7684\u5237\u810f\u9875\u5e76\u66ff\u6362\u51fa\u4e00\u4e2a\u7a7a\u95f2\u9875\u51fa\u6765\u3002<\/p>\n<p>InnoDB\u5237\u65b0\uff08\u5199\u51fa\uff09\u7f13\u51b2\u533a\u4e2d\u7684\u6570\u636e\u9875\u65f6\u91c7\u7528\u7684\u662f\u4e00\u6b21\u5199\u591a\u4e2a\u9875\u7684\u65b9\u5f0f\uff1a<\/p>\n<ul>\n<li>\u591a\u4e2a\u9875\u5c31\u53ef\u4ee5\u5148\u987a\u5e8f\u5199\u5165\u5230double write buffer\uff0c\u5e76\u8c03\u7528fsync()\u4fdd\u8bc1\u8fd9\u4e9b\u6570\u636e\u88ab\u5237\u65b0\u5230double write\u78c1\u76d8\uff08ibdata\uff09\u3002<\/li>\n<li>\u7136\u540e\u6570\u636e\u9875\u8c03\u7528fsync()\u88ab\u5237\u65b0\u5230\u5b9e\u9645\u5b58\u50a8\u4f4d\u7f6e\uff1b<\/li>\n<li>\u6545\u969c\u6062\u590d\u65f6InnoDB\u68c0\u67e5double write Buffer\u4e0e\u6570\u636e\u9875\u539f\u5b58\u50a8\u4f4d\u7f6e\u7684\u5185\u5bb9\uff0c\u82e5double write\u9875\u5904\u4e8e\u9875\u65ad\u88c2\u72b6\u6001\uff0c\u5219\u7b80\u5355\u7684\u4e22\u5f03\uff1b\u82e5\u6570\u636e\u9875\u4e0d\u4e00\u81f4\uff0c\u5219\u4ecedouble write\u9875\u8fd8\u539f\u3002<\/li>\n<\/ul>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000043990812\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u7531\u4e8edouble write\u9875\u843d\u76d8\u4e0e\u6570\u636e\u9875\u843d\u76d8\u5728\u4e0d\u540c\u7684\u65f6\u95f4\u70b9\uff0c\u4e0d\u4f1a\u51fa\u73b0double write\u9875\u548c\u6570\u636e\u9875\u540c\u65f6\u53d1\u751f\u65ad\u88c2\u7684\u60c5\u51b5\uff0c\u56e0\u6b64doublewrite\u6280\u672f\u53ef\u4ee5\u89e3\u51b3\u9875\u65ad\u88c2\u95ee\u9898\uff0c\u8fdb\u800c\u4fdd\u8bc1\u4e86\u91cd\u505a\u65e5\u5fd7\u80fd\u987a\u5229\u8fdb\u884c\uff0c\u6570\u636e\u5e93\u80fd\u6062\u590d\u5230\u4e00\u81f4\u7684\u72b6\u6001\u3002<\/p>\n<p><strong>3.\u81ea\u9002\u5e94\u54c8\u5e0c\u7d22\u5f15 Adaptive Hash Index<\/strong><\/p>\n<h2>4 \u53c2\u8003\u8d44\u6599<\/h2>\n<p>\u6398\u91d1\u5c0f\u518c\u300aMySQL \u662f\u600e\u6837\u8fd0\u884c\u7684\uff1a\u4ece\u6839\u513f\u4e0a\u7406\u89e3 MySQL\u300b\u5b66\u4e60\u7b14\u8bb0<a href=\"https:\/\/link.segmentfault.com\/?enc=YbyBhPvygi%2BVV%2FCtZHUOaw%3D%3D.R2GYjoixHAKFXvLMAr0UbN%2ByUAAO2Vj64nR6mkgxyn8wadsvB1sCwfKyMulnlNEf\" rel=\"nofollow\">https:\/\/www.jianshu.com\/p\/3394321c11bf<\/a><\/p>\n<blockquote>\n<p>\u4f5c\u8005\uff1a\u4eac\u4e1c\u7269\u6d41 \u9093\u94a7\u851a<\/p>\n<p>\u6765\u6e90\uff1a\u4eac\u4e1c\u4e91\u5f00\u53d1\u8005\u793e\u533a\u00a0\u81ea\u733f\u5176\u8bf4Tech<\/p>\n<\/blockquote>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000043990791\">https:\/\/segmentfault.com\/a\/1190000043990791<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>1 InnoDB\u5b58\u50a8\u5f15\u64ce InnoDB\u5b58\u50a8\u5f15\u64ce\u6700\u65e9\u7531Innobase Oy\u516c\u53f8\u5f00\u53d1\uff08\u5c5e\u7b2c\u4e09\u65b9\u5b58\u50a8\u5f15\u64ce\uff09\u3002\u4eceMy [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-10008064","post","type-post","status-publish","format-standard","hentry","category-share"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008064","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10008064"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008064\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10008064"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10008064"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10008064"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}