{"id":553,"date":"2016-05-27T21:25:35","date_gmt":"2016-05-27T13:25:35","guid":{"rendered":"http:\/\/www.xttblog.com\/?p=553"},"modified":"2016-05-27T21:28:30","modified_gmt":"2016-05-27T13:28:30","slug":"mysql%e6%80%a7%e8%83%bd%e4%bc%98%e5%8c%96%e4%b9%8bkey_buffer_size%e4%bc%98%e5%8c%96","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=553","title":{"rendered":"MySQL\u6027\u80fd\u4f18\u5316\u4e4bkey_buffer_size\u4f18\u5316"},"content":{"rendered":"<p>\n\t<span style=\"font-size:18px\"><span style=\"font-family: comic sans ms,cursive\">MySQL\u4e0d\u50cfOracle\u4e00\u6837\u5f3a\u5927\u65b9\u4fbf\uff0c\u51e0\u4e07\u6761\u7684\u6570\u636e\u67e5\u8be2\u5c31\u5f88\u6162\u3002\u56e0\u6b64\u6027\u80fd\u4f18\u5316\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\uff0c\u4eca\u5929\u5c31\u4e3a\u5927\u5bb6\u5206\u4eab\u4e00\u4e0b\u5982\u4f55\u901a\u8fc7\u4fee\u6539key_buffer_size\u5bf9MySQL\u8fdb\u884c\u6df1\u5165\u7684\u4f18\u5316\u3002<\/span><\/span>\n<\/p>\n<hr \/>\n<p>\n\t<span style=\"font-size:18px\"><span style=\"font-family: comic sans ms,cursive\">\u5728 MySQL \u6570\u636e\u5e93\u4e2d\uff0ckey_buffer_size\u662f\u5bf9MyISAM\u8868\u6027\u80fd\u5f71\u54cd\u6700\u5927\u7684\u4e00\u4e2a\u53c2\u6570(\u6ce8\u610f\u8be5\u53c2\u6570\u5bf9\u5176\u4ed6\u7c7b\u578b\u7684\u8868\u8bbe\u7f6e\u65e0\u6548)\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u547d\u4ee4\u67e5\u770b\u4ee5MyISAM\u4e3a\u4e3b\u8981\u5b58\u50a8\u5f15\u64ce\u7684key_buffer_size\u914d\u7f6e\u4fe1\u606f\uff1a<\/span><\/span>\n<\/p>\n<pre class=\"brush:sql;\">\r\nmysql&gt; show variables like &#039;key_buffer_size&#039;;\r\n+-----------------+------------+\r\n| Variable_name   | Value      |\r\n+-----------------+------------+\r\n| key_buffer_size | 536870912  |\r\n+-----------------+------------+<\/pre>\n<p>\n\t<span style=\"font-size:18px\"><span style=\"font-family: comic sans ms,cursive\">\u6211\u4eec\u53d1\u73b0key_buffer_size\u5206\u914d\u5230\u4e86512MB\u7684\u5185\u5b58\uff0c\u6211\u4eec\u518d\u901a\u8fc7\u4ee5\u4e0b\u547d\u4ee4\u5bf9key_buffer_size\u7684\u4f7f\u7528\u60c5\u51b5\u8fdb\u884c\u67e5\u770b\uff1a<\/span><\/span>\n<\/p>\n<pre class=\"brush:sql;\">\r\nmysql&gt; show global status like &#039;key_read%&#039;;\r\n+------------------------+-------------+\r\n| Variable_name | Value |\r\n+------------------------+-------------+\r\n| Key_read_requests | 27813678764 |    \/\/\u4ece\u7f13\u5b58\u8bfb\u53d6\u7d22\u5f15\u7684\u8bf7\u6c42\u6b21\u6570\u3002\r\n| Key_reads | 6798830 |         \/\/\u4ece\u78c1\u76d8\u8bfb\u53d6\u7d22\u5f15\u7684\u8bf7\u6c42\u6b21\u6570\u3002\r\n+------------------------+-------------+<\/pre>\n<p>\n\t<span style=\"font-size:18px\"><span style=\"font-family: comic sans ms,cursive\">\u4e00\u5171\u670927813678764\u4e2a\u7d22\u5f15\u8bfb\u53d6\u8bf7\u6c42\uff0c\u67096798830\u4e2a\u8bf7\u6c42\u5728\u5185\u5b58\u4e2d\u6ca1\u6709\u627e\u5230\u76f4\u63a5\u4ece\u786c\u76d8\u8bfb\u53d6\u7d22\u5f15\uff0c\u8ba1\u7b97\u7d22\u5f15\u672a\u547d\u4e2d\u7f13\u5b58\u7684\u6982\u7387\u7684\u516c\u5f0f\u5982\u4e0b\uff1a<\/span><\/span>\n<\/p>\n<pre class=\"prettyprint lang-xml\">\r\n<span class=\"pln\">key_cache_miss_rate = Key_reads \/ Key_read_requests * 100%<\/span><\/pre>\n<p>\n\t<span style=\"font-size:18px\"><span style=\"font-family: comic sans ms,cursive\">\u6bd4\u5982\u4e0a\u9762\u7684\u6570\u636e\uff0ckey_cache_miss_rate\u4e3a0.0244%\uff0c4000\u4e2a\u7d22\u5f15\u8bfb\u53d6\u8bf7\u6c42\u624d\u6709\u4e00\u4e2a\u76f4\u63a5\u8bfb\u786c\u76d8\uff0c\u5df2\u7ecf\u5f88BT\u4e86\uff0ckey_cache_miss_rate\u57280.1%\u4ee5\u4e0b\u90fd\u5f88\u597d(\u6bcf1000\u4e2a\u8bf7\u6c42\u6709\u4e00\u4e2a\u76f4\u63a5\u8bfb\u786c\u76d8)\uff0c\u6240\u4ee5\u7406\u8bba\u6765\u4e0a\u6765\u8bf4\uff0c\u8fd9\u4e2a\u6bd4\u503c\u8d8a\u5c0f\u8d8a\u597d\uff0c\u4f46\u8fc7\u5c0f\u7684\u8bdd\uff0c\u96be\u514d\u9020\u6210\u5185\u5b58\u6d6a\u8d39\u3002<br \/>\n\t\u4ee5\u4e0a\u4e24\u4e2a\u503c\u7684\u6bd4\u7387\u56fa\u7136\u80fd\u4e00\u90e8\u5206\u7684\u8bf4\u660ekey_buffer_size\u662f\u5426\u5408\u7406\uff0c\u4f46\u4ec5\u4ec5\u4ee5\u6b64\u5c31\u8bf4\u660e\u8be5\u503c\u8bbe\u7f6e\u7684\u5408\u7406\u7684\u8bdd\uff0c\u5c31\u8fc7\u4e8e\u504f\u6fc0\u548c\u7247\u9762\u4e86\u3002\u56e0\u4e3a\u8fd9\u91cc\u5ffd\u7565\u4e86\u4e24\u4e2a\u95ee\u9898\uff1a<br \/>\n\t<span style=\"color:#000080\"><strong>1\u3001\u6bd4\u4f8b\u5e76\u4e0d\u663e\u793a\u6570\u91cf\u7684\u7edd\u5bf9\u503c\u5927\u5c0f<br \/>\n\t2\u3001\u8ba1\u6570\u5668\u5e76\u6ca1\u6709\u8003\u8651\u65f6\u95f4\u56e0\u7d20<\/strong><\/span><br \/>\n\t\u867d\u8bf4Key_read_requests\u5927\u6bd4\u5c0f\u597d\uff0c\u4f46\u662f\u5bf9\u4e8e\u7cfb\u7edf\u8c03\u4f18\u800c\u8a00\uff0c\u66f4\u6709\u610f\u4e49\u7684\u5e94\u8be5\u662f\u5355\u4f4d\u65f6\u95f4\u5185\u7684Key_reads\uff0c\u5373\uff1a<\/span><\/span>\n<\/p>\n<pre class=\"prettyprint lang-xml\">\r\n<span class=\"pln\">Key_reads \/ Uptime<\/span><\/pre>\n<p>\n\t<span style=\"font-size:18px\"><span style=\"font-family: comic sans ms,cursive\">Key_reads\u7684\u5177\u4f53\u7528\u6cd5\u5982\u4e0b\uff1a<\/span><\/span>\n<\/p>\n<pre class=\"brush:sql;\">\r\n[root@web20 mysql]# mysqladmin ext -uroot -p -ri10 | grep Key_reads\r\nEnter password:\r\n| Key_reads                      | 279225     |\r\n| Key_reads                      | 116        |\r\n| Key_reads                      | 294        |\r\n| Key_reads                      | 255        |\r\n| Key_reads                      | 259        |\r\n| Key_reads                      | 342        |\r\n| Key_reads                      | 541        |\r\n| Key_reads                      | 733        |\r\n| Key_reads                      | 387        |\r\n| Key_reads                      | 583        |<\/pre>\n<p>\n\t<span style=\"font-size:18px\"><span style=\"font-family: comic sans ms,cursive\">\u6ce8\uff1a\u547d\u4ee4\u91cc\u7684mysqladmin ext\u5176\u5b9e\u5c31\u662fmysqladmin extended-status\uff0c\u4f60\u751a\u81f3\u53ef\u4ee5\u7b80\u5199\u6210mysqladmin e\u3002<br \/>\n\t\u5176\u4e2d\u7b2c\u4e00\u884c\u8868\u793a\u7684\u662f\u6c47\u603b\u6570\u503c\uff0c\u6240\u4ee5\u8fd9\u91cc\u4e0d\u5fc5\u8003\u8651\uff0c\u4e0b\u9762\u7684\u6bcf\u884c\u6570\u503c\u90fd\u8868\u793a10\u79d2\u5185\u7684\u6570\u636e\u53d8\u5316\uff0c\u4ece\u8fd9\u4efd\u6570\u636e\u53ef\u4ee5\u770b\u51fa\u6bcf10\u79d2\u7cfb\u7edf\u5927\u7ea6\u4f1a\u51fa\u73b0500\u6b21Key_reads\u8bbf\u95ee\uff0c\u6298\u5408\u5230\u6bcf1\u79d2\u5c31\u662f50\u6b21\u5de6\u53f3\uff0c\u81f3\u4e8e\u8fd9\u4e2a\u6570\u503c\u5230\u5e95\u5408\u7406\u4e0e\u5426\uff0c\u5c31\u7531\u670d\u52a1\u5668\u7684\u78c1\u76d8\u80fd\u529b\u800c\u5b9a\u4e86\u3002(\u6ce8\uff1a\u6211\u8fd9\u91cc\u4e4b\u6240\u4ee5\u6570\u636e\u53d8\u5316\u8f83\u5927\uff0c\u662f\u56e0\u4e3a\u6709update\u7b49\u8bed\u53e5\u9020\u6210\u4e86\u8868\u9501\u800c\u5bfc\u81f4\u4e0b\u4e2a\u65f6\u95f4\u6bb5\u5185\u7684\u67e5\u8be2\u6570\u731b\u589e\u3002)<br \/>\n\t\u4e3a\u5565\u6570\u636e\u630910\u79d2\u53d6\u6837\uff0c\u800c\u4e0d\u662f\u76f4\u63a5\u63091\u79d2\u53d6\u6837\uff1f\u7531\u4e8e\u65f6\u95f4\u6bb5\u8fc7\u5c0f\uff0c\u6570\u636e\u53d8\u5316\u6bd4\u8f83\u5267\u70c8\uff0c\u4e0d\u5bb9\u6613\u76f4\u89c2\u4f30\u8ba1\u5927\u5c0f\uff0c\u6240\u4ee5\u901a\u5e38\u6570\u636e\u6309\u716710\u79d2\u6216\u800560\u79d2\u4e4b\u7c7b\u7684\u65f6\u95f4\u6bb5\u6765\u53d6\u6837\u662f\u66f4\u597d\u7684\u3002<\/span><\/span>\n<\/p>\n<p>\n\t<span style=\"font-size:18px\"><span style=\"font-family: comic sans ms,cursive\">\u9664\u4e9b\u4e4b\u5916\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u53c2\u8003\u4e0bkey_blocks_*\u53c2\u6570\uff1a<\/span><\/span>\n<\/p>\n<pre class=\"brush:sql;\">\r\nmysql&gt; show global status like &#039;key_blocks_u%&#039;;\r\n+------------------------+-------------+\r\n| Variable_name | Value |\r\n+------------------------+-------------+\r\n| Key_blocks_unused | 0 |\r\n| Key_blocks_used | 413543 |\r\n+------------------------+-------------+<\/pre>\n<p>\n\t<span style=\"font-size:18px\"><span style=\"font-family: comic sans ms,cursive\">Key_blocks_unused\u8868\u793a\u672a\u4f7f\u7528\u7684\u7f13\u5b58\u7c07(blocks)\u6570\uff0cKey_blocks_used\u8868\u793a\u66fe\u7ecf\u7528\u5230\u7684\u6700\u5927\u7684blocks\u6570\uff0c\u6bd4\u5982\u8fd9 \u53f0\u670d\u52a1\u5668\uff0c\u6240\u6709\u7684\u7f13\u5b58\u90fd\u7528\u5230\u4e86\uff0c\u8981\u4e48\u589e\u52a0key_buffer_size\uff0c\u8981\u4e48\u5c31\u662f\u8fc7\u6e21\u7d22\u5f15\u4e86\uff0c\u628a\u7f13\u5b58\u5360\u6ee1\u4e86\u3002\u6bd4\u8f83\u7406\u60f3\u7684\u8bbe\u7f6e\uff1a <\/span><\/span>\n<\/p>\n<pre class=\"prettyprint lang-xml\">\r\n<span class=\"pln\">Key_blocks_used \/ (Key_blocks_unused + Key_blocks_used) * 100% &asymp; 80%<\/span><\/pre>\n<p>\n\t<span style=\"font-size:18px\"><span style=\"font-family: comic sans ms,cursive\">mysqladmin\u662fMySQL\u4e00\u4e2a\u91cd\u8981\u7684\u5ba2\u6237\u7aef\uff0c\u6700\u5e38\u89c1\u7684\u662f\u4f7f\u7528\u5b83\u6765\u5173\u95ed\u6570\u636e\u5e93\uff0c\u9664\u6b64\uff0c\u8be5\u547d\u4ee4\u8fd8\u53ef\u4ee5\u4e86\u89e3MySQL\u8fd0\u884c\u72b6\u6001\u3001\u8fdb\u7a0b\u4fe1\u606f\u3001\u8fdb\u7a0b\u6740\u6b7b\u7b49\u3002\u672c\u6587\u4ecb\u7ecd\u4e00\u4e0b\u5982\u4f55\u4f7f\u7528mysqladmin extended-status(\u56e0\u4e3a\u6ca1\u6709&quot;\u6b67\u4e49&quot;\uff0c\u6240\u4ee5\u53ef\u4ee5\u4f7f\u7528ext\u4ee3\u66ff)\u4e86\u89e3MySQL\u7684\u8fd0\u884c\u72b6\u6001\u3002<br \/>\n\t1. \u4f7f\u7528-r\/-i\u53c2\u6570<br \/>\n\t\u4f7f\u7528mysqladmin extended-status\u547d\u4ee4\u53ef\u4ee5\u83b7\u5f97\u6240\u6709MySQL\u6027\u80fd\u6307\u6807\uff0c\u5373show global status\u7684\u8f93\u51fa\uff0c\u4e0d\u8fc7\uff0c\u56e0\u4e3a\u591a\u6570\u8fd9\u4e9b\u6307\u6807\u90fd\u662f\u7d2f\u8ba1\u503c\uff0c\u5982\u679c\u60f3\u4e86\u89e3\u5f53\u524d\u7684\u72b6\u6001\uff0c\u5219\u9700\u8981\u8fdb\u884c\u4e00\u6b21\u5dee\u503c\u8ba1\u7b97\uff0c\u8fd9\u5c31\u662fmysqladmin extended-status\u7684\u4e00\u4e2a\u989d\u5916\u529f\u80fd\uff0c\u975e\u5e38\u5b9e\u7528\u3002\u9ed8\u8ba4\u7684\uff0c\u4f7f\u7528extended-status\uff0c\u770b\u5230\u4e5f\u662f\u7d2f\u8ba1\u503c\uff0c\u4f46\u662f\uff0c\u52a0\u4e0a\u53c2\u6570-r(&#8211;relative)\uff0c\u5c31\u53ef\u4ee5\u770b\u5230\u5404\u4e2a\u6307\u6807\u7684\u5dee\u503c\uff0c\u914d\u5408\u53c2\u6570-i(&#8211;sleep)\u5c31\u53ef\u4ee5\u6307\u5b9a\u5237\u65b0\u7684\u9891\u7387\uff0c\u90a3\u4e48\u5c31\u6709\u5982\u4e0b\u547d\u4ee4\uff1a<\/span><\/span>\n<\/p>\n<pre class=\"brush:sql;\">\r\nmysqladmin -uroot -r -i 1 -pxxx extended-status\r\n+------------------------------------------+----------------------+\r\n| Variable_name                            | Value                |\r\n+------------------------------------------+----------------------+\r\n| Aborted_clients                          | 0                    |\r\n| Com_select                               | 336                  |\r\n| Com_insert                               | 243                  |\r\n......\r\n| Threads_created                          | 0                    |\r\n+------------------------------------------+----------------------+<\/pre>\n<p>\n\t<span style=\"font-size:18px\"><span style=\"font-family: comic sans ms,cursive\">2. \u914d\u5408grep\u4f7f\u7528<br \/>\n\t\u914d\u5408grep\u4f7f\u7528\uff0c\u6211\u4eec\u5c31\u6709\uff1a<\/span><\/span>\n<\/p>\n<pre class=\"brush:sql;\">\r\nmysqladmin -uroot -r -i 1 -pxxx extended-status \\\r\ngrep &quot;Questions\\|Queries\\|Innodb_rows\\|Com_select \\|Com_insert \\|Com_update \\|Com_delete &quot;\r\n| Com_delete                               | 1                    |\r\n| Com_delete_multi                         | 0                    |\r\n| Com_insert                               | 321                  |\r\n| Com_select                               | 286                  |\r\n| Com_update                               | 63                   |\r\n| Innodb_rows_deleted                      | 1                    |\r\n| Innodb_rows_inserted                     | 207                  |\r\n| Innodb_rows_read                         | 5211                 |\r\n| Innodb_rows_updated                      | 65                   |\r\n| Queries                                  | 2721                 |\r\n| Questions                                | 2721                 |<\/pre>\n<p>\n\t<span style=\"font-size:18px\"><span style=\"font-family: comic sans ms,cursive\">\u5f53\u7136\uff0c\u8fd8\u53ef\u4ee5\u914d\u5408awk\u7b49\uff0c\u7b14\u8005\u5728\u8fd9\u91cc\u5c31\u4e0d\u4e00\u4e00\u4ecb\u7ecd\u4e86\uff0c\u6709\u60c5\u8da3\u7684\u670b\u53cb\u53ef\u4ee5\u53c2\u8003\u4e00\u4e0b\u5176\u5b83\u6587\u6863\u3002<\/span><\/span>\n<\/p>\n<p>\n\t<strong>\u7248\u6743\u58f0\u660e\uff1a\u672c\u6587\u4e3a\u535a\u4e3b\u539f\u521b\u6587\u7ae0\uff0c\u672a\u7ecf\u535a\u4e3b\u5141\u8bb8\u4e0d\u5f97\u8f6c\u8f7d\u3002<\/strong><\/p>\n<!-- <audio autoplay=\"autoplay\" height=\"100\" width=\"100\" hidden=\"true\"><source src=\"https:\/\/c.coka.la\/orAvPR.mp3\" type=\"audio\/mp3\"\/><\/audio><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/ws3.sinaimg.cn\/large\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/> --><p><!-- <img decoding=\"async\" src=\"https:\/\/raw.githubusercontent.com\/xmt1139057136\/xttblog\/master\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/>--><img decoding=\"async\" src=\"https:\/\/saas.51autoparts.cn\/api\/admin\/sys-file\/oss\/file?fileName=84db51f8561e448f9a4fda2eff0811f9.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/><\/p><p>\u6700\u540e\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u4e2a\u4eba\u5fae\u4fe1\u516c\u4f17\u53f7\uff1a\u4e1a\u4f59\u8349\uff08yyucao\uff09\uff01<b>\u53ef\u52a0\u4f5c\u8005\u5fae\u4fe1\u53f7\uff1a<font color=\"red\">xttblog2<\/font>\u3002\u5907\u6ce8\uff1a\u201c1\u201d\uff0c\u6dfb\u52a0\u535a\u4e3b\u5fae\u4fe1\u62c9\u4f60\u8fdb\u5fae\u4fe1\u7fa4\u3002\u5907\u6ce8\u9519\u8bef\u4e0d\u4f1a\u540c\u610f\u597d\u53cb\u7533\u8bf7\u3002<\/b>\u518d\u6b21\u611f\u8c22\u60a8\u7684\u5173\u6ce8\uff01\u540e\u7eed\u6709\u7cbe\u5f69\u5185\u5bb9\u4f1a\u7b2c\u4e00\u65f6\u95f4\u53d1\u7ed9\u60a8\uff01\u539f\u521b\u6587\u7ae0\u6295\u7a3f\u8bf7\u53d1\u9001\u81f3532009913@qq.com\u90ae\u7bb1\u3002\u5546\u52a1\u5408\u4f5c\u4e5f\u53ef\u6dfb\u52a0\u4f5c\u8005\u5fae\u4fe1\u8fdb\u884c\u8054\u7cfb\uff01<\/p><p>\u672c\u6587\u539f\u6587\u51fa\u5904\uff1a<a href=\"https:\/\/www.xttblog.com\">\u4e1a\u4f59\u8349<\/a>\uff1a &raquo; <a href=\"https:\/\/www.xttblog.com\/?p=553\">MySQL\u6027\u80fd\u4f18\u5316\u4e4bkey_buffer_size\u4f18\u5316<\/a><\/p><!-- <div class=\"bd-reward-stl\"><button id=\"bdRewardBtn\"><span><\/span><\/button><\/div> 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