\u53d8\u91cf\u540d\u8bf4\u660e Qcache_free_blocks \u7f13\u5b58\u4e2d\u76f8\u90bb\u5185\u5b58\u5757\u7684\u4e2a\u6570\u3002\u6570\u76ee\u5927\u8bf4\u660e\u53ef\u80fd\u6709\u788e\u7247\u3002FLUSH QUERY CACHE \u4f1a\u5bf9\u7f13\u5b58\u4e2d\u7684\u788e\u7247\u8fdb\u884c\u6574\u7406\uff0c\u4ece\u800c\u5f97\u5230\u4e00\u4e2a\u7a7a\u95f2\u5757\u3002 Qcache_free_memory \u7f13\u5b58\u4e2d\u7684\u7a7a\u95f2\u5185\u5b58\u3002 Qcache_hits \u6bcf\u6b21\u67e5\u8be2\u5728\u7f13\u5b58\u4e2d\u547d\u4e2d\u65f6\u5c31\u589e\u5927\u3002 <\/p>\n
Qcache_inserts \u6bcf\u6b21\u63d2\u5165\u4e00\u4e2a\u67e5\u8be2\u65f6\u5c31\u589e\u5927\u3002\u547d\u4e2d\u6b21\u6570\u9664\u4ee5\u63d2\u5165\u6b21\u6570\u5c31\u662f\u4e0d\u4e2d\u6bd4\u7387\uff1b\u7528 1 \u51cf\u53bb\u8fd9\u4e2a\u503c\u5c31\u662f\u547d\u4e2d\u7387\u3002\u5728\u4e0a\u9762\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u5927\u7ea6\u6709 87% \u7684\u67e5\u8be2\u90fd\u5728\u7f13\u5b58\u4e2d\u547d\u4e2d\u3002 Qcache_lowmem_prunes \u7f13\u5b58\u51fa\u73b0\u5185\u5b58\u4e0d\u8db3\u5e76\u4e14\u5fc5\u987b\u8981\u8fdb\u884c\u6e05\u7406\u4ee5\u4fbf\u4e3a\u66f4\u591a\u67e5\u8be2\u63d0\u4f9b\u7a7a\u95f4\u7684\u6b21\u6570\u3002\u8fd9\u4e2a\u6570\u5b57\u6700\u597d\u957f\u65f6\u95f4\u6765\u770b\uff1b\u5982\u679c\u8fd9\u4e2a\u6570\u5b57\u5728\u4e0d\u65ad\u589e\u957f\uff0c\u5c31\u8868\u793a\u53ef\u80fd\u788e\u7247\u975e\u5e38\u4e25\u91cd\uff0c\u6216\u8005\u5185\u5b58\u5f88\u5c11\u3002\uff08\u4e0a\u9762\u7684 free_blocks \u548c free_memory \u53ef\u4ee5\u544a\u8bc9\u60a8\u5c5e\u4e8e\u54ea\u79cd\u60c5\u51b5\uff09\u3002 Qcache_not_cached \u4e0d\u9002\u5408\u8fdb\u884c\u7f13\u5b58\u7684\u67e5\u8be2\u7684\u6570\u91cf\uff0c\u901a\u5e38\u662f\u7531\u4e8e\u8fd9\u4e9b\u67e5\u8be2\u4e0d\u662f SELECT \u8bed\u53e5\u3002 Qcache_queries_in_cache \u5f53\u524d\u7f13\u5b58\u7684\u67e5\u8be2\uff08\u548c\u54cd\u5e94\uff09\u7684\u6570\u91cf\u3002 Qcache_total_blocks \u7f13\u5b58\u4e2d\u5757\u7684\u6570\u91cf\u3002<\/p>\n
\u901a\u5e38\uff0c\u95f4\u9694\u51e0\u79d2\u663e\u793a\u8fd9\u4e9b\u53d8\u91cf\u5c31\u53ef\u4ee5\u770b\u51fa\u533a\u522b\uff0c\u8fd9\u53ef\u4ee5\u5e2e\u52a9\u786e\u5b9a\u7f13\u5b58\u662f\u5426\u6b63\u5728\u6709\u6548\u5730\u4f7f\u7528\u3002\u8fd0\u884c FLUSH STATUS \u53ef\u4ee5\u91cd\u7f6e\u4e00\u4e9b\u8ba1\u6570\u5668\uff0c\u5982\u679c\u670d\u52a1\u5668\u5df2\u7ecf\u8fd0\u884c\u4e86\u4e00\u6bb5\u65f6\u95f4\uff0c\u8fd9\u4f1a\u975e\u5e38\u6709\u5e2e\u52a9\u3002<\/p>\n
\u4f7f\u7528\u975e\u5e38\u5927\u7684\u67e5\u8be2\u7f13\u5b58\uff0c\u671f\u671b\u53ef\u4ee5\u7f13\u5b58\u6240\u6709\u4e1c\u897f\uff0c\u8fd9\u79cd\u60f3\u6cd5\u975e\u5e38\u8bf1\u4eba\u3002\u7531\u4e8e mysqld \u5fc5\u987b\u8981\u5bf9\u7f13\u5b58\u8fdb\u884c\u7ef4\u62a4\uff0c\u4f8b\u5982\u5f53\u5185\u5b58\u53d8\u5f97\u5f88\u4f4e\u65f6\u6267\u884c\u526a\u9664\uff0c\u56e0\u6b64\u670d\u52a1\u5668\u53ef\u80fd\u4f1a\u5728\u8bd5\u56fe\u7ba1\u7406\u7f13\u5b58\u65f6\u800c\u9677\u5165\u56f0\u5883\u3002\u4f5c\u4e3a\u4e00\u6761\u89c4\u5219\uff0c\u5982\u679c FLUSH QUERY CACHE \u5360\u7528\u4e86\u5f88\u957f\u65f6\u95f4\uff0c\u90a3\u5c31\u8bf4\u660e\u7f13\u5b58\u592a\u5927\u4e86\u3002<\/p>\n
\u5f3a\u5236\u9650\u5236<\/p>\n
\u60a8\u53ef\u4ee5\u5728 mysqld \u4e2d\u5f3a\u5236\u4e00\u4e9b\u9650\u5236\u6765\u786e\u4fdd\u7cfb\u7edf\u8d1f\u8f7d\u4e0d\u4f1a\u5bfc\u81f4\u8d44\u6e90\u8017\u5c3d\u7684\u60c5\u51b5\u51fa\u73b0\u3002\u6e05\u5355 3 \u7ed9\u51fa\u4e86 my.cnf \u4e2d\u4e0e\u8d44\u6e90\u6709\u5173\u7684\u4e00\u4e9b\u91cd\u8981\u8bbe\u7f6e\u3002<\/p>\n
\u6e05\u5355 3. MySQL \u8d44\u6e90\u8bbe\u7f6e<\/p>\n
set-variable=max_connections=500
set-variable=wait_timeout=10
max_connect_errors = 100<\/p>\n
\u8fde\u63a5\u6700\u5927\u4e2a\u6570\u662f\u5728\u7b2c\u4e00\u884c\u4e2d\u8fdb\u884c\u7ba1\u7406\u7684\u3002\u4e0e Apache \u4e2d\u7684 MaxClients \u7c7b\u4f3c\uff0c\u5176\u60f3\u6cd5\u662f\u786e\u4fdd\u53ea\u5efa\u7acb\u670d\u52a1\u5141\u8bb8\u6570\u76ee\u7684\u8fde\u63a5\u3002\u8981\u786e\u5b9a\u670d\u52a1\u5668\u4e0a\u76ee\u524d\u5efa\u7acb\u8fc7\u7684\u6700\u5927\u8fde\u63a5\u6570\uff0c\u8bf7\u6267\u884c SHOW STATUS LIKE 'max_used_connections'\u3002<\/p>\n
\u7b2c 2 \u884c\u544a\u8bc9 mysqld \u7ec8\u6b62\u6240\u6709\u7a7a\u95f2\u65f6\u95f4\u8d85\u8fc7 10 \u79d2\u7684\u8fde\u63a5\u3002\u5728 LAMP \u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u8fde\u63a5\u6570\u636e\u5e93\u7684\u65f6\u95f4\u901a\u5e38\u5c31\u662f Web \u670d\u52a1\u5668\u5904\u7406\u8bf7\u6c42\u6240\u82b1\u8d39\u7684\u65f6\u95f4\u3002\u6709\u65f6\u5019\uff0c\u5982\u679c\u8d1f\u8f7d\u8fc7\u91cd\uff0c\u8fde\u63a5\u4f1a\u6302\u8d77\uff0c\u5e76\u4e14\u4f1a\u5360\u7528\u8fde\u63a5\u8868\u7a7a\u95f4\u3002\u5982\u679c\u6709\u591a\u4e2a\u4ea4\u4e92\u7528\u6237\u6216\u4f7f\u7528\u4e86\u5230\u6570\u636e\u5e93\u7684\u6301\u4e45\u8fde\u63a5\uff0c\u90a3\u4e48\u5c06\u8fd9\u4e2a\u503c\u8bbe \u4f4e\u4e00\u70b9\u5e76\u4e0d\u53ef\u53d6\uff01<\/p>\n
\u6700\u540e\u4e00\u884c\u662f\u4e00\u4e2a\u5b89\u5168\u7684\u65b9\u6cd5\u3002\u5982\u679c\u4e00\u4e2a\u4e3b\u673a\u5728\u8fde\u63a5\u5230\u670d\u52a1\u5668\u65f6\u6709\u95ee\u9898\uff0c\u5e76\u91cd\u8bd5\u5f88\u591a\u6b21\u540e\u653e\u5f03\uff0c\u90a3\u4e48\u8fd9\u4e2a\u4e3b\u673a\u5c31\u4f1a\u88ab\u9501\u5b9a\uff0c\u76f4\u5230 FLUSH HOSTS \u4e4b\u540e\u624d\u80fd\u8fd0\u884c\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c10 \u6b21\u5931\u8d25\u5c31\u8db3\u4ee5\u5bfc\u81f4\u9501\u5b9a\u4e86\u3002\u5c06\u8fd9\u4e2a\u503c\u4fee\u6539\u4e3a 100 \u4f1a\u7ed9\u670d\u52a1\u5668\u8db3\u591f\u7684\u65f6\u95f4\u6765\u4ece\u95ee\u9898\u4e2d\u6062\u590d\u3002\u5982\u679c\u91cd\u8bd5 100 \u6b21\u90fd\u65e0\u6cd5\u5efa\u7acb\u8fde\u63a5\uff0c\u90a3\u4e48\u4f7f\u7528\u518d\u9ad8\u7684\u503c\u4e5f\u4e0d\u4f1a\u6709\u592a\u591a\u5e2e\u52a9\uff0c\u53ef\u80fd\u5b83\u6839\u672c\u5c31\u65e0\u6cd5\u8fde\u63a5\u3002<\/p>\n
\u7f13\u51b2\u533a\u548c\u7f13\u5b58<\/p>\n
MySQL \u652f\u6301\u8d85\u8fc7 100 \u4e2a\u7684\u53ef\u8c03\u8282\u8bbe\u7f6e\uff1b\u4f46\u662f\u5e78\u8fd0\u7684\u662f\uff0c\u638c\u63e1\u5c11\u6570\u51e0\u4e2a\u5c31\u53ef\u4ee5\u6ee1\u8db3\u5927\u90e8\u5206\u9700\u8981\u3002\u67e5\u627e\u8fd9\u4e9b\u8bbe\u7f6e\u7684\u6b63\u786e\u503c\u53ef\u4ee5\u901a\u8fc7 SHOW STATUS \u547d\u4ee4\u67e5\u770b\u72b6\u6001\u53d8\u91cf\uff0c\u4ece\u4e2d\u53ef\u4ee5\u786e\u5b9a mysqld \u7684\u8fd0\u4f5c\u60c5\u51b5\u662f\u5426\u7b26\u5408\u6211\u4eec\u7684\u9884\u671f\u3002\u7ed9\u7f13\u51b2\u533a\u548c\u7f13\u5b58\u5206\u914d\u7684\u5185\u5b58\u4e0d\u80fd\u8d85\u8fc7\u7cfb\u7edf\u4e2d\u7684\u73b0\u6709\u5185\u5b58\uff0c\u56e0\u6b64\u8c03\u4f18\u901a\u5e38\u90fd\u9700\u8981\u8fdb\u884c\u4e00\u4e9b\u59a5\u534f\u3002<\/p>\n
MySQL \u53ef\u8c03\u8282\u8bbe\u7f6e\u53ef\u4ee5\u5e94\u7528\u4e8e\u6574\u4e2a mysqld \u8fdb\u7a0b\uff0c\u4e5f\u53ef\u4ee5\u5e94\u7528\u4e8e\u5355\u4e2a\u5ba2\u6237\u673a\u4f1a\u8bdd\u3002<\/p>\n
\u670d\u52a1\u5668\u7aef\u7684\u8bbe\u7f6e<\/p>\n
\u6bcf\u4e2a\u8868\u90fd\u53ef\u4ee5\u8868\u793a\u4e3a\u78c1\u76d8\u4e0a\u7684\u4e00\u4e2a\u6587\u4ef6\uff0c\u5fc5\u987b\u5148\u6253\u5f00\uff0c\u540e\u8bfb\u53d6\u3002\u4e3a\u4e86\u52a0\u5feb\u4ece\u6587\u4ef6\u4e2d\u8bfb\u53d6\u6570\u636e\u7684\u8fc7\u7a0b\uff0cmysqld \u5bf9\u8fd9\u4e9b\u6253\u5f00\u6587\u4ef6\u8fdb\u884c\u4e86\u7f13\u5b58\uff0c\u5176\u6700\u5927\u6570\u76ee\u7531 \/etc\/mysqld.conf \u4e2d\u7684 table_cache \u6307\u5b9a\u3002\u6e05\u5355 4 \u7ed9\u51fa\u4e86\u663e\u793a\u4e0e\u6253\u5f00\u8868\u6709\u5173\u7684\u6d3b\u52a8\u7684\u65b9\u5f0f\u3002<\/p>\n
\u6e05\u5355 4. \u663e\u793a\u6253\u5f00\u8868\u7684\u6d3b\u52a8<\/p>\n
mysql> SHOW STATUS LIKE 'open%tables';
————— ——-
| Variable_name | Value |
————— ——-
| Open_tables | 5000 |
| Opened_tables | 195 |
————— ——-
2 rows in set (0.00 sec)<\/p>\n
\u6e05\u5355 4 \u8bf4\u660e\u76ee\u524d\u6709 5,000 \u4e2a\u8868\u662f\u6253\u5f00\u7684\uff0c\u6709 195 \u4e2a\u8868\u9700\u8981\u6253\u5f00\uff0c\u56e0\u4e3a\u73b0\u5728\u7f13\u5b58\u4e2d\u5df2\u7ecf\u6ca1\u6709\u53ef\u7528\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e86\uff08\u7531\u4e8e\u7edf\u8ba1\u4fe1\u606f\u5728\u524d\u9762\u5df2\u7ecf\u6e05\u9664\u4e86\uff0c\u56e0\u6b64\u53ef\u80fd\u4f1a\u5b58\u5728 5,000 \u4e2a\u6253\u5f00\u8868\u4e2d\u53ea\u6709 195 \u4e2a\u6253\u5f00\u8bb0\u5f55\u7684\u60c5\u51b5\uff09\u3002\u5982\u679c Opened_tables \u968f\u7740\u91cd\u65b0\u8fd0\u884c SHOW STATUS \u547d\u4ee4\u5feb\u901f\u589e\u52a0\uff0c\u5c31\u8bf4\u660e\u7f13\u5b58\u547d\u4e2d\u7387\u4e0d\u591f\u3002\u5982\u679c Open_tables \u6bd4 table_cache \u8bbe\u7f6e\u5c0f\u5f88\u591a\uff0c\u5c31\u8bf4\u660e\u8be5\u503c\u592a\u5927\u4e86\uff08\u4e0d\u8fc7\u6709\u7a7a\u95f4\u53ef\u4ee5\u589e\u957f\u603b\u4e0d\u662f\u4ec0\u4e48\u574f\u4e8b\uff09\u3002\u4f8b\u5982\uff0c\u4f7f\u7528 table_cache = 5000 \u53ef\u4ee5\u8c03\u6574\u8868\u7684\u7f13\u5b58\u3002<\/p>\n
\u4e0e\u8868\u7684\u7f13\u5b58\u7c7b\u4f3c\uff0c\u5bf9\u4e8e\u7ebf\u7a0b\u6765\u8bf4\u4e5f\u6709\u4e00\u4e2a\u7f13\u5b58\u3002 mysqld \u5728\u63a5\u6536\u8fde\u63a5\u65f6\u4f1a\u6839\u636e\u9700\u8981\u751f\u6210\u7ebf\u7a0b\u3002\u5728\u4e00\u4e2a\u8fde\u63a5\u53d8\u5316\u5f88\u5feb\u7684\u7e41\u5fd9\u670d\u52a1\u5668\u4e0a\uff0c\u5bf9\u7ebf\u7a0b\u8fdb\u884c\u7f13\u5b58\u4fbf\u4e8e\u4ee5\u540e\u4f7f\u7528\u53ef\u4ee5\u52a0\u5feb\u6700\u521d\u7684\u8fde\u63a5\u3002<\/p>\n
\u5355 5 \u663e\u793a\u5982\u4f55\u786e\u5b9a\u662f\u5426\u7f13\u5b58\u4e86\u8db3\u591f\u7684\u7ebf\u7a0b\u3002<\/p>\n
\u6e05\u5355 5. \u663e\u793a\u7ebf\u7a0b\u4f7f\u7528\u7edf\u8ba1\u4fe1\u606f<\/p>\n
mysql> SHOW STATUS LIKE 'threads%';
——————- ——–
| Variable_name | Value |
——————- ——–
| Threads_cached | 27 |
| Threads_connected | 15 |
| Threads_created | 838610 |
| Threads_running | 3 |
——————- ——–
4 rows in set (0.00 sec)<\/p>\n
\u6b64\u5904\u91cd\u8981\u7684\u503c\u662f Threads_created\uff0c\u6bcf\u6b21 mysqld \u9700\u8981\u521b\u5efa\u4e00\u4e2a\u65b0\u7ebf\u7a0b\u65f6\uff0c\u8fd9\u4e2a\u503c\u90fd\u4f1a\u589e\u52a0\u3002\u5982\u679c\u8fd9\u4e2a\u6570\u5b57\u5728\u8fde\u7eed\u6267\u884c SHOW STATUS \u547d\u4ee4\u65f6\u5feb\u901f\u589e\u52a0\uff0c\u5c31\u5e94\u8be5\u5c1d\u8bd5\u589e\u5927\u7ebf\u7a0b\u7f13\u5b58\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u5728 my.cnf \u4e2d\u4f7f\u7528 thread_cache = 40 \u6765\u5b9e\u73b0\u6b64\u76ee\u7684\u3002<\/p>\n
\u5173\u952e\u5b57\u7f13\u51b2\u533a\u4fdd\u5b58\u4e86 MyISAM \u8868\u7684\u7d22\u5f15\u5757\u3002\u7406\u60f3\u60c5\u51b5\u4e0b\uff0c\u5bf9\u4e8e\u8fd9\u4e9b\u5757\u7684\u8bf7\u6c42\u5e94\u8be5\u6765\u81ea\u4e8e\u5185\u5b58\uff0c\u800c\u4e0d\u662f\u6765\u81ea\u4e8e\u78c1\u76d8\u3002\u6e05\u5355 6 \u663e\u793a\u4e86\u5982\u4f55\u786e\u5b9a\u6709\u591a\u5c11\u5757\u662f\u4ece\u78c1\u76d8\u4e2d\u8bfb\u53d6\u7684\uff0c\u4ee5\u53ca\u6709\u591a\u5c11\u5757\u662f\u4ece\u5185\u5b58\u4e2d\u8bfb\u53d6\u7684\u3002<\/p>\n
\u6e05\u5355 6. \u786e\u5b9a\u5173\u952e\u5b57\u6548\u7387<\/p>\n
mysql> show status like '%key_read%';
——————- ———–
| Variable_name | Value |
——————- ———–
| Key_read_requests | 163554268 |
| Key_reads | 98247 |
——————- ———–
2 rows in set (0.00 sec)<\/p>\n
Key_reads \u4ee3\u8868\u547d\u4e2d\u78c1\u76d8\u7684\u8bf7\u6c42\u4e2a\u6570\uff0c Key_read_requests \u662f\u603b\u6570\u3002\u547d\u4e2d\u78c1\u76d8\u7684\u8bfb\u8bf7\u6c42\u6570\u9664\u4ee5\u8bfb\u8bf7\u6c42\u603b\u6570\u5c31\u662f\u4e0d\u4e2d\u6bd4\u7387 \u2014\u2014 \u5728\u672c\u4f8b\u4e2d\u6bcf 1,000 \u4e2a\u8bf7\u6c42\uff0c\u5927\u7ea6\u6709 0.6 \u4e2a\u6ca1\u6709\u547d\u4e2d\u5185\u5b58\u3002\u5982\u679c\u6bcf 1,000 \u4e2a\u8bf7\u6c42\u4e2d\u547d\u4e2d\u78c1\u76d8\u7684\u6570\u76ee\u8d85\u8fc7 1 \u4e2a\uff0c\u5c31\u5e94\u8be5\u8003\u8651\u589e\u5927\u5173\u952e\u5b57\u7f13\u51b2\u533a\u4e86\u3002\u4f8b\u5982\uff0ckey_buffer = 384M \u4f1a\u5c06\u7f13\u51b2\u533a\u8bbe\u7f6e\u4e3a 384MB\u3002<\/p>\n
\u4e34\u65f6\u8868\u53ef\u4ee5\u5728\u66f4\u9ad8\u7ea7\u7684\u67e5\u8be2\u4e2d\u4f7f\u7528\uff0c\u5176\u4e2d\u6570\u636e\u5728\u8fdb\u4e00\u6b65\u8fdb\u884c\u5904\u7406\uff08\u4f8b\u5982 GROUP BY \u5b57\u53e5\uff09\u4e4b\u524d\uff0c\u90fd\u5fc5\u987b\u5148\u4fdd\u5b58\u5230\u4e34\u65f6\u8868\u4e2d\uff1b\u7406\u60f3\u60c5\u51b5\u4e0b\uff0c\u5728\u5185\u5b58\u4e2d\u521b\u5efa\u4e34\u65f6\u8868\u3002\u4f46\u662f\u5982\u679c\u4e34\u65f6\u8868\u53d8\u5f97\u592a\u5927\uff0c\u5c31\u9700\u8981\u5199\u5165\u78c1\u76d8\u4e2d\u3002\u6e05\u5355 7 \u7ed9\u51fa\u4e86\u4e0e\u4e34\u65f6\u8868\u521b\u5efa\u6709\u5173\u7684\u7edf\u8ba1\u4fe1\u606f\u3002<\/p>\n
\u6e05\u5355 7. \u786e\u5b9a\u4e34\u65f6\u8868\u7684\u4f7f\u7528<\/p>\n
mysql> SHOW STATUS LIKE 'created_tmp%';
————————- ——-
| Variable_name | Value |
————————- ——-
| Created_tmp_disk_tables | 30660 |
| Created_tmp_files | 2 |
| Created_tmp_tables | 32912 |
————————- ——-
3 rows in set (0.00 sec)<\/p>\n
\u6bcf\u6b21\u4f7f\u7528\u4e34\u65f6\u8868\u90fd\u4f1a\u589e\u5927 Created_tmp_tables\uff1b\u57fa\u4e8e\u78c1\u76d8\u7684\u8868\u4e5f\u4f1a\u589e\u5927 Created_tmp_disk_tables\u3002\u5bf9\u4e8e\u8fd9\u4e2a\u6bd4\u7387\uff0c\u5e76\u6ca1\u6709\u4ec0\u4e48\u4e25\u683c\u7684\u89c4\u5219\uff0c\u56e0\u4e3a\u8fd9\u4f9d\u8d56\u4e8e\u6240\u6d89\u53ca\u7684\u67e5\u8be2\u3002\u957f\u65f6\u95f4\u89c2\u5bdf Created_tmp_disk_tables \u4f1a\u663e\u793a\u6240\u521b\u5efa\u7684\u78c1\u76d8\u8868\u7684\u6bd4\u7387\uff0c\u60a8\u53ef\u4ee5\u786e\u5b9a\u8bbe\u7f6e\u7684\u6548\u7387\u3002 tmp_table_size \u548c max_heap_table_size \u90fd\u53ef\u4ee5\u63a7\u5236\u4e34\u65f6\u8868\u7684\u6700\u5927\u5927\u5c0f\uff0c\u56e0\u6b64\u8bf7\u786e\u4fdd\u5728 my.cnf \u4e2d\u5bf9\u8fd9\u4e24\u4e2a\u503c\u90fd\u8fdb\u884c\u4e86\u8bbe\u7f6e\u3002<\/p>\n
\u6bcf\u4e2a\u4f1a\u8bdd\u7684\u8bbe\u7f6e<\/p>\n
\u4e0b\u9762\u8fd9\u4e9b\u8bbe\u7f6e\u9488\u5bf9\u4e8e\u6bcf\u4e2a\u4f1a\u8bdd\u3002\u5728\u8bbe\u7f6e\u8fd9\u4e9b\u6570\u5b57\u65f6\u8981\u5341\u5206\u8c28\u614e\uff0c\u56e0\u4e3a\u5b83\u4eec\u5728\u4e58\u4ee5\u53ef\u80fd\u5b58\u5728\u7684\u8fde\u63a5\u6570\u65f6\u5019\uff0c\u8fd9\u4e9b\u9009\u9879\u8868\u793a\u5927\u91cf\u7684\u5185\u5b58\uff01\u60a8\u53ef\u4ee5\u901a\u8fc7\u4ee3\u7801\u4fee\u6539\u4f1a\u8bdd\u4e2d\u7684\u8fd9\u4e9b\u6570\u5b57\uff0c\u6216\u8005\u5728 my.cnf \u4e2d\u4e3a\u6240\u6709\u4f1a\u8bdd\u4fee\u6539\u8fd9\u4e9b\u8bbe\u7f6e\u3002<\/p>\n
\u5f53 MySQL \u5fc5\u987b\u8981\u8fdb\u884c\u6392\u5e8f\u65f6\uff0c\u5c31\u4f1a\u5728\u4ece\u78c1\u76d8\u4e0a\u8bfb\u53d6\u6570\u636e\u65f6\u5206\u914d\u4e00\u4e2a\u6392\u5e8f\u7f13\u51b2\u533a\u6765\u5b58\u653e\u8fd9\u4e9b\u6570\u636e\u884c\u3002\u5982\u679c\u8981\u6392\u5e8f\u7684\u6570\u636e\u592a\u5927\uff0c\u90a3\u4e48\u6570\u636e\u5c31\u5fc5\u987b\u4fdd\u5b58\u5230\u78c1\u76d8\u4e0a\u7684\u4e34\u65f6\u6587\u4ef6\u4e2d\uff0c\u5e76\u518d\u6b21\u8fdb\u884c\u6392\u5e8f\u3002\u5982\u679c sort_merge_passes \u72b6\u6001\u53d8\u91cf\u5f88\u5927\uff0c\u8fd9\u5c31\u6307\u793a\u4e86\u78c1\u76d8\u7684\u6d3b\u52a8\u60c5\u51b5\u3002\u6e05\u5355 8 \u7ed9\u51fa\u4e86\u4e00\u4e9b\u4e0e\u6392\u5e8f\u76f8\u5173\u7684\u72b6\u6001\u8ba1\u6570\u5668\u4fe1\u606f\u3002<\/p>\n
\u6e05\u5355 8. \u663e\u793a\u6392\u5e8f\u7edf\u8ba1\u4fe1\u606f<\/p>\n
mysql> SHOW STATUS LIKE “sort%”;
——————- ———
| Variable_name | Value |
——————- ———
| Sort_merge_passes | 1 |
| Sort_range | 79192 |
| Sort_rows | 2066532 |
| Sort_scan | 44006 |
——————- ———
4 rows in set (0.00 sec)<\/p>\n
\u5982\u679c sort_merge_passes \u5f88\u5927\uff0c\u5c31\u8868\u793a\u9700\u8981\u6ce8\u610f sort_buffer_size\u3002\u4f8b\u5982\uff0c sort_buffer_size = 4M \u5c06\u6392\u5e8f\u7f13\u51b2\u533a\u8bbe\u7f6e\u4e3a 4MB\u3002<\/p>\n
MySQL \u4e5f\u4f1a\u5206\u914d\u4e00\u4e9b\u5185\u5b58\u6765\u8bfb\u53d6\u8868\u3002\u7406\u60f3\u60c5\u51b5\u4e0b\uff0c\u7d22\u5f15\u63d0\u4f9b\u4e86\u8db3\u591f\u591a\u7684\u4fe1\u606f\uff0c\u53ef\u4ee5\u53ea\u8bfb\u5165\u6240\u9700\u8981\u7684\u884c\uff0c\u4f46\u662f\u6709\u65f6\u5019\u67e5\u8be2\uff08\u8bbe\u8ba1\u4e0d\u4f73\u6216\u6570\u636e\u672c\u6027\u4f7f\u7136\uff09\u9700\u8981\u8bfb\u53d6\u8868\u4e2d\u5927\u91cf\u6570\u636e\u3002\u8981\u7406\u89e3\u8fd9\u79cd\u884c\u4e3a\uff0c\u9700\u8981\u77e5\u9053\u8fd0\u884c\u4e86\u591a\u5c11\u4e2a SELECT \u8bed\u53e5\uff0c\u4ee5\u53ca\u9700\u8981\u8bfb\u53d6\u8868\u4e2d\u7684\u4e0b\u4e00\u884c\u6570\u636e\u7684\u6b21\u6570\uff08\u800c\u4e0d\u662f\u901a\u8fc7\u7d22\u5f15\u76f4\u63a5\u8bbf\u95ee\uff09\u3002\u5b9e\u73b0\u8fd9\u79cd\u529f\u80fd\u7684\u547d\u4ee4\u5982\u6e05\u5355 9 \u6240\u793a\u3002<\/p>\n
\u6e05\u5355 9. \u786e\u5b9a\u8868\u626b\u63cf\u6bd4\u7387<\/p>\n
mysql> SHOW STATUS LIKE “com_select”;
————— ——–
| Variable_name | Value |
————— ——–
| Com_select | 318243 |
————— ——–
1 row in set (0.00 sec)<\/p>\n
mysql> SHOW STATUS LIKE “handler_read_rnd_next”;
———————– ———–
| Variable_name | Value |
———————– ———–
| Handler_read_rnd_next | 165959471 |
———————– ———–
1 row in set (0.00 sec)<\/p>\n
Handler_read_rnd_next \/ Com_select \u5f97\u51fa\u4e86\u8868\u626b\u63cf\u6bd4\u7387 \u2014\u2014 \u5728\u672c\u4f8b\u4e2d\u662f 521:1\u3002\u5982\u679c\u8be5\u503c\u8d85\u8fc7 4000\uff0c\u5c31\u5e94\u8be5\u67e5\u770b read_buffer_size\uff0c\u4f8b\u5982 read_buffer_size = 4M\u3002\u5982\u679c\u8fd9\u4e2a\u6570\u5b57\u8d85\u8fc7\u4e86 8M\uff0c\u5c31\u5e94\u8be5\u4e0e\u5f00\u53d1\u4eba\u5458\u8ba8\u8bba\u4e00\u4e0b\u5bf9\u8fd9\u4e9b\u67e5\u8be2\u8fdb\u884c\u8c03\u4f18\u4e86\uff01<\/p>\n
3 \u4e2a\u5fc5\u4e0d\u53ef\u5c11\u7684\u5de5\u5177<\/p>\n
\u5c3d\u7ba1\u5728\u4e86\u89e3\u5177\u4f53\u8bbe\u7f6e\u65f6\uff0cSHOW STATUS \u547d\u4ee4\u4f1a\u975e\u5e38\u6709\u7528\uff0c\u4f46\u662f\u60a8\u8fd8\u9700\u8981\u4e00\u4e9b\u5de5\u5177\u6765\u89e3\u91ca mysqld \u6240\u63d0\u4f9b\u7684\u5927\u91cf\u6570\u636e\u3002\u6211\u53d1\u73b0\u6709 3 \u4e2a\u5de5\u5177\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\uff1b\u5728 \u53c2\u8003\u8d44\u6599 \u4e00\u8282\u4e2d\u60a8\u53ef\u4ee5\u627e\u5230\u76f8\u5e94\u7684\u94fe\u63a5\u3002<\/p>\n
\u5927\u90e8\u5206\u7cfb\u7edf\u7ba1\u7406\u5458\u90fd\u975e\u5e38\u719f\u6089 top \u547d\u4ee4\uff0c\u5b83\u4e3a\u4efb\u52a1\u6240\u6d88\u8017\u7684 CPU \u548c\u5185\u5b58\u63d0\u4f9b\u4e86\u4e00\u4e2a\u4e0d\u65ad\u66f4\u65b0\u7684\u89c6\u56fe\u3002 mytop \u5bf9 top \u8fdb\u884c\u4e86\u4eff\u771f\uff1b\u5b83\u4e3a\u6240\u6709\u8fde\u63a5\u4e0a\u7684\u5ba2\u6237\u673a\u4ee5\u53ca\u5b83\u4eec\u6b63\u5728\u8fd0\u884c\u7684\u67e5\u8be2\u63d0\u4f9b\u4e86\u4e00\u4e2a\u89c6\u56fe\u3002mytop \u8fd8\u63d0\u4f9b\u4e86\u4e00\u4e2a\u6709\u5173\u5173\u952e\u5b57\u7f13\u51b2\u533a\u548c\u67e5\u8be2\u7f13\u5b58\u6548\u7387\u7684\u5b9e\u65f6\u6570\u636e\u548c\u5386\u53f2\u6570\u636e\uff0c\u4ee5\u53ca\u6709\u5173\u6b63\u5728\u8fd0\u884c\u7684\u67e5\u8be2\u7684\u7edf\u8ba1\u4fe1\u606f\u3002\u8fd9\u662f\u4e00\u4e2a\u5f88\u6709\u7528\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u67e5\u770b\u7cfb\u7edf\u4e2d\uff08\u6bd4\u5982 10 \u79d2\u949f\u4e4b\u5185\uff09\u7684\u72b6\u51b5\uff0c\u60a8\u53ef\u4ee5\u83b7\u5f97\u6709\u5173\u670d\u52a1\u5668\u5065\u5eb7\u4fe1\u606f\u7684\u89c6\u56fe\uff0c\u5e76\u663e\u793a\u5bfc\u81f4\u95ee\u9898\u7684\u4efb\u4f55\u8fde\u63a5\u3002<\/p>\n
mysqlard \u662f\u4e00\u4e2a\u8fde\u63a5\u5230 MySQL \u670d\u52a1\u5668\u4e0a\u7684\u5b88\u62a4\u7a0b\u5e8f\uff0c\u8d1f\u8d23\u6bcf 5 \u5206\u949f\u641c\u96c6\u4e00\u6b21\u6570\u636e\uff0c\u5e76\u5c06\u5b83\u4eec\u5b58\u50a8\u5230\u540e\u53f0\u7684\u4e00\u4e2a Round Robin Database \u4e2d\u3002\u6709\u4e00\u4e2a Web \u9875\u9762\u4f1a\u663e\u793a\u8fd9\u4e9b\u6570\u636e\uff0c\u4f8b\u5982\u8868\u7f13\u5b58\u7684\u4f7f\u7528\u60c5\u51b5\u3001\u5173\u952e\u5b57\u6548\u7387\u3001\u8fde\u63a5\u4e0a\u7684\u5ba2\u6237\u673a\u4ee5\u53ca\u4e34\u65f6\u8868\u7684\u4f7f\u7528\u60c5\u51b5\u3002\u5c3d\u7ba1 mytop \u63d0\u4f9b\u4e86\u670d\u52a1\u5668\u5065\u5eb7\u4fe1\u606f\u7684\u5feb\u7167\uff0c\u4f46\u662f mysqlard \u5219\u63d0\u4f9b\u4e86\u957f\u671f\u7684\u5065\u5eb7\u4fe1\u606f\u3002\u4f5c\u4e3a\u5956\u52b1\uff0cmysqlard \u4f7f\u7528\u81ea\u5df1\u641c\u96c6\u5230\u7684\u4e00\u4e9b\u4fe1\u606f\u9488\u5bf9\u5982\u4f55\u5bf9\u670d\u52a1\u5668\u8fdb\u884c\u8c03\u4f18\u7ed9\u51fa\u4e00\u4e9b\u5efa\u8bae\u3002<\/p>\n
\u641c\u96c6 SHOW STATUS \u4fe1\u606f\u7684\u53e6\u5916\u4e00\u4e2a\u5de5\u5177\u662f mysqlreport\u3002\u5176\u62a5\u544a\u8981\u8fdc\u6bd4 mysqlard \u66f4\u52a0\u590d\u6742\uff0c\u56e0\u4e3a\u9700\u8981\u5bf9\u670d\u52a1\u5668\u7684\u6bcf\u4e2a\u65b9\u9762\u90fd\u8fdb\u884c\u5206\u6790\u3002\u8fd9\u662f\u5bf9\u670d\u52a1\u5668\u8fdb\u884c\u8c03\u4f18\u7684\u4e00\u4e2a\u975e\u5e38\u597d\u7684\u5de5\u5177\uff0c\u56e0\u4e3a\u5b83\u5bf9\u72b6\u6001\u53d8\u91cf\u8fdb\u884c\u9002\u5f53\u8ba1\u7b97\u6765\u5e2e\u52a9\u786e\u5b9a\u9700\u8981\u4fee\u6b63\u54ea\u4e9b\u95ee\u9898\u3002<\/p>\n
\u7ed3\u675f\u8bed<\/p>\n
\u672c\u6587\u4ecb\u7ecd\u4e86\u5bf9 MySQL \u8fdb\u884c\u8c03\u4f18\u7684\u4e00\u4e9b\u57fa\u7840\u77e5\u8bc6\uff0c\u5e76\u5bf9\u8fd9\u4e2a\u9488\u5bf9 LAMP \u7ec4\u4ef6\u8fdb\u884c\u8c03\u4f18\u7684 3 \u90e8\u5206\u7cfb\u5217\u6587\u7ae0\u8fdb\u884c\u4e86\u603b\u7ed3\u3002\u8c03\u4f18\u5f88\u5927\u7a0b\u5ea6\u4e0a\u9700\u8981\u7406\u89e3\u7ec4\u4ef6\u7684\u5de5\u4f5c\u539f\u7406\uff0c\u786e\u5b9a\u5b83\u4eec\u662f\u5426\u6b63\u5e38\u5de5\u4f5c\uff0c\u8fdb\u884c\u4e00\u4e9b\u8c03\u6574\uff0c\u5e76\u91cd\u65b0\u8bc4\u6d4b\u3002\u6bcf\u4e2a\u7ec4\u4ef6 \u2014\u2014 Linux\u3001Apache\u3001PHP \u6216 MySQL \u2014\u2014 \u90fd\u6709\u5404\u79cd\u5404\u6837\u7684\u9700\u6c42\u3002\u5206\u522b\u7406\u89e3\u5404\u4e2a\u7ec4\u4ef6\u53ef\u4ee5\u5e2e\u52a9\u51cf\u5c11\u53ef\u80fd\u4f1a\u5bfc\u81f4\u5e94\u7528\u7a0b\u5e8f\u901f\u5ea6\u53d8\u6162\u7684\u74f6\u9888\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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