{"id":1995,"date":"2011-04-27T00:46:52","date_gmt":"2011-04-27T00:46:52","guid":{"rendered":"http:\/\/www.icocean.com\/blog\/?p=1995"},"modified":"2011-04-27T00:57:31","modified_gmt":"2011-04-27T00:57:31","slug":"mysql%E4%B8%AD%E6%96%87%E6%89%8B%E5%86%8C%3A%E4%BB%8E%E5%8F%82%E6%95%B0%E4%BC%98%E5%8C%96%E4%B8%AD%E5%BE%97%E5%88%B0%E6%9C%80%E5%A4%A7%E7%9A%84%E6%95%B0%E6%8D%AE%E5%BA%93%E6%80%A7%E8%83%BD24","status":"publish","type":"post","link":"https:\/\/www.icocean.com\/blog\/?p=1995","title":{"rendered":"MySQL\u4e2d\u6587\u624b\u518c: \u4ece\u53c2\u6570\u4f18\u5316\u4e2d\u5f97\u5230\u6700\u5927\u7684\u6570\u636e\u5e93\u6027\u80fd(2\/4)"},"content":{"rendered":"<p>10.2.3 \u8c03\u8282\u670d\u52a1\u5668\u53c2\u6570<br \/>\u4f60\u80fd\u7528\u8fd9\u4e2a\u547d\u4ee4\u5f97\u5230mysqld\u670d\u52a1\u5668\u7f3a\u7701\u7f13\u51b2\u533a\u5927\u5c0f\uff1a <\/p>\n<p>shell>; mysqld &#8211;help<\/p>\n<p>\u8fd9\u4e2a\u547d\u4ee4\u751f\u6210\u4e00\u5f20\u6240\u6709mysqld\u9009\u9879\u548c\u53ef\u914d\u7f6e\u53d8\u91cf\u7684\u8868\u3002\u8f93\u51fa\u5305\u62ec\u7f3a\u7701\u503c\u5e76\u4e14\u770b\u4e0a\u53bb\u8c61\u8fd9\u6837\u4e00\u4e9b\u4e1c\u897f\uff1a <\/p>\n<p>Possible variables for option &#8211;set-variable (-O) are:<br \/>back_log&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;current value: 5<br \/>connect_timeout&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; current value: 5<br \/>delayed_insert_timeout&nbsp;&nbsp;current value: 300<br \/>delayed_insert_limit&nbsp;&nbsp;current value: 100<br \/>delayed_queue_size&nbsp;&nbsp;&nbsp;&nbsp;current value: 1000<br \/>flush_time&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;current value: 0<br \/>interactive_timeout&nbsp;&nbsp; current value: 28800<br \/>join_buffer_size&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;current value: 131072<br \/>key_buffer_size&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; current value: 1048540<br \/>lower_case_table_names&nbsp;&nbsp;current value: 0<br \/>long_query_time&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; current value: 10<!--more--><br \/>max_allowed_packet&nbsp;&nbsp;&nbsp;&nbsp;current value: 1048576<br \/>max_connections&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; current value: 100<br \/>max_connect_errors&nbsp;&nbsp;&nbsp;&nbsp;current value: 10<br \/>max_delayed_threads&nbsp;&nbsp; current value: 20<br \/>max_heap_table_size&nbsp;&nbsp; current value: 16777216<br \/>max_join_size&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; current value: 4294967295<br \/>max_sort_length&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; current value: 1024<br \/>max_tmp_tables&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;current value: 32<br \/>max_write_lock_count&nbsp;&nbsp;current value: 4294967295<br \/>net_buffer_length&nbsp;&nbsp;&nbsp;&nbsp; current value: 16384<br \/>query_buffer_size&nbsp;&nbsp;&nbsp;&nbsp; current value: 0<br \/>record_buffer&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; current value: 131072<br \/>sort_buffer&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; current value: 2097116<br \/>table_cache&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; current value: 64<br \/>thread_concurrency&nbsp;&nbsp;&nbsp;&nbsp;current value: 10<br \/>tmp_table_size&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;current value: 1048576<br \/>thread_stack&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;current value: 131072<br \/>wait_timeout&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;current value: 28800<\/p>\n<p>\u5982\u679c\u6709\u4e00\u4e2amysqld\u670d\u52a1\u5668\u6b63\u5728\u8fd0\u884c\uff0c\u901a\u8fc7\u6267\u884c\u8fd9\u4e2a\u547d\u4ee4\uff0c\u4f60\u53ef\u4ee5\u770b\u5230\u5b83\u5b9e\u9645\u4e0a\u4f7f\u7528\u7684\u53d8\u91cf\u7684\u503c\uff1a <\/p>\n<p>shell>; mysqladmin variables<\/p>\n<p>\u6bcf\u4e2a\u9009\u9879\u5728\u4e0b\u9762\u63cf\u8ff0\u3002\u5bf9\u4e8e\u7f13\u51b2\u533a\u5927\u5c0f\u3001\u957f\u5ea6\u548c\u6808\u5927\u5c0f\u7684\u503c\u4ee5\u5b57\u8282\u7ed9\u51fa\uff0c\u4f60\u80fd\u7528\u4e8e\u4e2a\u540e\u7f00\u201cK\u201d\u6216\u201cM\u201d \u6307\u51fa\u4ee5K\u5b57\u8282\u6216\u5146\u5b57\u8282\u663e\u793a\u503c\u3002\u4f8b\u5982\uff0c16M\u6307\u51fa16\u5146\u5b57\u8282\u3002\u540e\u7f00\u5b57\u6bcd\u7684\u5927\u5c0f\u5199\u6ca1\u6709\u5173\u7cfb\uff1b16M\u548c16m\u662f\u76f8\u540c\u7684\u3002 <\/p>\n<p>\u4f60\u4e5f\u53ef\u4ee5\u7528\u547d\u4ee4SHOW STATUS\u81ea\u4e00\u4e2a\u8fd0\u884c\u7684\u670d\u52a1\u5668\u770b\u89c1\u4e00\u4e9b\u7edf\u8ba1\u3002\u89c17.21 SHOW\u8bed\u6cd5(\u5f97\u5230\u8868\u3001\u5217\u7684\u4fe1\u606f)\u3002 <\/p>\n<p>back_log <br \/>\u8981\u6c42MySQL\u80fd\u6709\u7684\u8fde\u63a5\u6570\u91cf\u3002\u5f53\u4e3b\u8981MySQL\u7ebf\u7a0b\u5728\u4e00\u4e2a\u5f88\u77ed\u65f6\u95f4\u5185\u5f97\u5230\u975e\u5e38\u591a\u7684\u8fde\u63a5\u8bf7\u6c42\uff0c\u8fd9\u5c31\u8d77\u4f5c\u7528\uff0c\u7136\u540e\u4e3b\u7ebf\u7a0b\u82b1\u4e9b\u65f6\u95f4(\u5c3d\u7ba1\u5f88\u77ed)\u68c0\u67e5\u8fde\u63a5\u5e76\u4e14\u542f\u52a8\u4e00\u4e2a\u65b0\u7ebf\u7a0b\u3002back_log\u503c\u6307\u51fa\u5728MySQL\u6682\u65f6\u505c\u6b62\u56de\u7b54\u65b0\u8bf7\u6c42\u4e4b\u524d\u7684\u77ed\u65f6\u95f4\u5185\u591a\u5c11\u4e2a\u8bf7\u6c42\u53ef\u4ee5\u88ab\u5b58\u5728\u5806\u6808\u4e2d\u3002\u53ea\u6709\u5982\u679c\u671f\u671b\u5728\u4e00\u4e2a\u77ed\u65f6\u95f4\u5185\u6709\u5f88\u591a\u8fde\u63a5\uff0c\u4f60\u9700\u8981\u589e\u52a0\u5b83\uff0c\u6362\u53e5\u8bdd\u8bf4\uff0c\u8fd9\u503c\u5bf9\u5230\u6765\u7684TCP\/IP\u8fde\u63a5\u7684\u4fa6\u542c\u961f\u5217\u7684\u5927\u5c0f\u3002\u4f60\u7684\u64cd\u4f5c\u7cfb\u7edf\u5728\u8fd9\u4e2a\u961f\u5217\u5927\u5c0f\u4e0a\u6709\u5b83\u81ea\u5df1\u7684\u9650\u5236\u3002 Unix listen(2)\u7cfb\u7edf\u8c03\u7528\u7684\u624b\u518c\u9875\u5e94\u8be5\u6709\u66f4\u591a\u7684\u7ec6\u8282\u3002\u68c0\u67e5\u4f60\u7684OS\u6587\u6863\u627e\u51fa\u8fd9\u4e2a\u53d8\u91cf\u7684\u6700\u5927\u503c\u3002\u8bd5\u56fe\u8bbe\u5b9aback_log\u9ad8\u4e8e\u4f60\u7684\u64cd\u4f5c\u7cfb\u7edf\u7684\u9650\u5236\u5c06\u662f\u65e0\u6548\u7684\u3002 <br \/>connect_timeout <br \/>mysqld\u670d\u52a1\u5668\u5728\u7528Bad handshake\uff08\u7cdf\u7cd5\u7684\u63e1\u624b\uff09\u5e94\u7b54\u524d\u6b63\u5728\u7b49\u5f85\u4e00\u4e2a\u8fde\u63a5\u62a5\u6587\u7684\u79d2\u6570\u3002 <br \/>delayed_insert_timeout <br \/>\u4e00\u4e2aINSERT DELAYED\u7ebf\u7a0b\u5e94\u8be5\u5728\u7ec8\u6b62\u4e4b\u524d\u7b49\u5f85INSERT\u8bed\u53e5\u7684\u65f6\u95f4\u3002 <br \/>delayed_insert_limit <br \/>\u5728\u63d2\u5165delayed_insert_limit\u884c\u540e\uff0cINSERT DELAYED\u5904\u7406\u5668\u5c06\u68c0\u67e5\u662f\u5426\u6709\u4efb\u4f55SELECT\u8bed\u53e5\u672a\u6267\u884c\u3002\u5982\u679c\u8fd9\u6837\uff0c\u5728\u7ee7\u7eed\u524d\u6267\u884c\u5141\u8bb8\u8fd9\u4e9b\u8bed\u53e5\u3002 <br \/>delayed_queue_size <br \/>\u5e94\u8be5\u4e3a\u5904\u7406INSERT DELAYED\u5206\u914d\u591a\u5927\u4e00\u4e2a\u961f\u5217(\u4ee5\u884c\u6570)\u3002\u5982\u679c\u6392\u961f\u6ee1\u4e86\uff0c\u4efb\u4f55\u8fdb\u884cINSERT DELAYED\u7684\u5ba2\u6237\u5c06\u7b49\u5f85\u76f4\u5230\u961f\u5217\u53c8\u6709\u7a7a\u95f4\u4e86\u3002 <br \/>flush_time <br \/>\u5982\u679c\u8fd9\u88ab\u8bbe\u7f6e\u4e3a\u975e\u96f6\u503c\uff0c\u90a3\u4e48\u6bcfflush_time\u79d2\u6240\u6709\u8868\u5c06\u88ab\u5173\u95ed(\u4ee5\u91ca\u653e\u8d44\u6e90\u548csync\u5230\u78c1\u76d8)\u3002 <br \/>interactive_timeout <br \/>\u670d\u52a1\u5668\u5728\u5173\u4e0a\u5b83\u524d\u5728\u4e00\u4e2a\u4ea4\u4e92\u8fde\u63a5\u4e0a\u7b49\u5f85\u884c\u52a8\u7684\u79d2\u6570\u3002\u4e00\u4e2a\u4ea4\u4e92\u7684\u5ba2\u6237\u88ab\u5b9a\u4e49\u4e3a\u5bf9mysql_real_connect()\u4f7f\u7528CLIENT_INTERACTIVE\u9009\u9879\u7684\u5ba2\u6237\u3002\u4e5f\u53ef\u89c1wait_timeout\u3002 <br \/>join_buffer_size <br \/>\u7528\u4e8e\u5168\u90e8\u8054\u7ed3(join)\u7684\u7f13\u51b2\u533a\u5927\u5c0f(\u4e0d\u662f\u7528\u7d22\u5f15\u7684\u8054\u7ed3)\u3002\u7f13\u51b2\u533a\u5bf92\u4e2a\u8868\u95f4\u7684\u6bcf\u4e2a\u5168\u90e8\u8054\u7ed3\u5206\u914d\u4e00\u6b21\u7f13\u51b2\u533a\uff0c\u5f53\u589e\u52a0\u7d22\u5f15\u4e0d\u53ef\u80fd\u65f6\uff0c\u589e\u52a0\u8be5\u503c\u53ef\u5f97\u5230\u4e00\u4e2a\u66f4\u5feb\u7684\u5168\u90e8\u8054\u7ed3\u3002\uff08\u901a\u5e38\u5f97\u5230\u5feb\u901f\u8054\u7ed3\u7684\u6700\u4f73\u65b9\u6cd5\u662f\u589e\u52a0\u7d22\u5f15\u3002\uff09 <br \/>key_buffer_size <br \/>\u7d22\u5f15\u5757\u662f\u7f13\u51b2\u7684\u5e76\u4e14\u88ab\u6240\u6709\u7684\u7ebf\u7a0b\u5171\u4eab\u3002key_buffer_size\u662f\u7528\u4e8e\u7d22\u5f15\u5757\u7684\u7f13\u51b2\u533a\u5927\u5c0f\uff0c\u589e\u52a0\u5b83\u53ef\u5f97\u5230\u66f4\u597d\u5904\u7406\u7684\u7d22\u5f15(\u5bf9\u6240\u6709\u8bfb\u548c\u591a\u91cd\u5199)\uff0c\u5230\u4f60\u80fd\u8d1f\u62c5\u5f97\u8d77\u90a3\u6837\u591a\u3002\u5982\u679c\u4f60\u4f7f\u5b83\u592a\u5927\uff0c\u7cfb\u7edf\u5c06\u5f00\u59cb\u6362\u9875\u5e76\u4e14\u771f\u7684\u53d8\u6162\u4e86\u3002\u8bb0\u4f4f\u65e2\u7136MySQL\u4e0d\u7f13\u5b58\u8bfb\u53d6\u7684\u6570\u636e\uff0c\u4f60\u5c06\u5fc5\u987b\u4e3aOS\u6587\u4ef6\u7cfb\u7edf\u7f13\u5b58\u7559\u4e0b\u4e00\u4e9b\u7a7a\u95f4\u3002\u4e3a\u4e86\u5728\u5199\u5165\u591a\u4e2a\u884c\u65f6\u5f97\u5230\u66f4\u591a\u7684\u901f\u5ea6\uff0c\u4f7f\u7528LOCK TABLES\u3002\u89c17.24LOCK TABLES\/UNLOCK TABLES\u8bed\u6cd5\u3002 <br \/>long_query_time <br \/>\u5982\u679c\u4e00\u4e2a\u67e5\u8be2\u6240\u7528\u65f6\u95f4\u8d85\u8fc7\u5b83(\u4ee5\u79d2\u8ba1)\uff0cSlow_queries\u8bb0\u6570\u5668\u5c06\u88ab\u589e\u52a0\u3002 <br \/>max_allowed_packet <br \/>\u4e00\u4e2a\u5305\u7684\u6700\u5927\u5c3a\u5bf8\u3002\u6d88\u606f\u7f13\u51b2\u533a\u88ab\u521d\u59cb\u5316\u4e3anet_buffer_length\u5b57\u8282\uff0c\u4f46\u662f\u53ef\u5728\u9700\u8981\u65f6\u589e\u52a0\u5230max_allowed_packet\u4e2a\u5b57\u8282\u3002\u7f3a\u7701\u5730\uff0c\u8be5\u503c\u592a\u5c0f\u5fc5\u80fd\u6355\u6349\u5927\u7684(\u53ef\u80fd\u9519\u8bef)\u5305\u3002\u5982\u679c\u4f60\u6b63\u5728\u4f7f\u7528\u5927\u7684BLOB\u5217\uff0c\u4f60\u5fc5\u987b\u589e\u52a0\u8be5\u503c\u3002\u5b83\u5e94\u8be5\u8c61\u4f60\u60f3\u8981\u4f7f\u7528\u7684\u6700\u5927BLOB\u7684\u90a3\u4e48\u5927\u3002 <br \/>max_connections <br \/>\u5141\u8bb8\u7684\u540c\u65f6\u5ba2\u6237\u7684\u6570\u91cf\u3002\u589e\u52a0\u8be5\u503c\u589e\u52a0mysqld\u8981\u6c42\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u6570\u91cf\u3002\u89c1\u4e0b\u9762\u5bf9\u6587\u4ef6\u63cf\u8ff0\u7b26\u9650\u5236\u7684\u6ce8\u91ca\u3002\u89c118.2.4 Too many connections\u9519\u8bef\u3002 <br \/>max_connect_errors <br \/>\u5982\u679c\u6709\u591a\u4e8e\u8be5\u6570\u91cf\u7684\u4ece\u4e00\u53f0\u4e3b\u673a\u4e2d\u65ad\u7684\u8fde\u63a5\uff0c\u8fd9\u53f0\u4e3b\u673a\u963b\u6b62\u8fdb\u4e00\u6b65\u7684\u8fde\u63a5\u3002\u4f60\u53ef\u7528FLUSH HOSTS\u547d\u4ee4\u758f\u901a\u4e00\u53f0\u4e3b\u673a\u3002 <br \/>max_delayed_threads <br \/>\u4e0d\u8981\u542f\u52a8\u591a\u4e8e\u7684\u8fd9\u4e2a\u6570\u5b57\u7684\u7ebf\u7a0b\u6765\u5904\u7406INSERT DELAYED\u8bed\u53e5\u3002\u5982\u679c\u4f60\u8bd5\u56fe\u5728\u6240\u6709INSERT DELAYED\u7ebf\u7a0b\u5728\u7528\u540e\u5411\u4e00\u5f20\u65b0\u8868\u63d2\u5165\u6570\u636e\uff0c\u884c\u5c06\u88ab\u63d2\u5165\uff0c\u5c31\u50cfDELAYED\u5c5e\u6027\u6ca1\u88ab\u6307\u5b9a\u90a3\u6837\u3002 <br \/>max_join_size <br \/>\u53ef\u80fd\u5c06\u8981\u8bfb\u5165\u591a\u4e8emax_join_size\u4e2a\u8bb0\u5f55\u7684\u8054\u7ed3\u5c06\u8fd4\u56de\u4e00\u4e2a\u9519\u8bef\u3002\u5982\u679c\u4f60\u7684\u7528\u6237\u60f3\u8981\u6267\u884c\u6ca1\u6709\u4e00\u4e2aWHERE\u5b50\u53e5\u3001\u82b1\u5f88\u957f\u65f6\u95f4\u5e76\u4e14\u8fd4\u56de\u767e\u4e07\u884c\u7684\u8054\u7ed3\uff0c\u8bbe\u7f6e\u5b83\u3002 <br \/>max_sort_length <br \/>\u5728\u6392\u5e8fBLOB\u6216TEXT\u503c\u65f6\u4f7f\u7528\u7684\u5b57\u8282\u6570(\u6bcf\u4e2a\u503c\u4ec5\u5934max_sort_length\u4e2a\u5b57\u8282\u88ab\u4f7f\u7528\uff1b\u5176\u4f59\u7684\u88ab\u5ffd\u7565)\u3002 <br \/>max_tmp_tables <br \/>\uff08\u8be5\u9009\u62e9\u76ee\u524d\u8fd8\u4e0d\u505a\u4efb\u4f55\u4e8b\u60c5)\u3002\u4e00\u4e2a\u5ba2\u6237\u80fd\u540c\u65f6\u4fdd\u6301\u6253\u5f00\u7684\u4e34\u65f6\u8868\u7684\u6700\u5927\u6570\u91cf\u3002 <br \/>net_buffer_length <br \/>\u901a\u4fe1\u7f13\u51b2\u533a\u5728\u67e5\u8be2\u4e4b\u95f4\u88ab\u91cd\u7f6e\u5230\u8be5\u5927\u5c0f\u3002\u901a\u5e38\u8fd9\u4e0d\u5e94\u8be5\u88ab\u6539\u53d8\uff0c\u4f46\u662f\u5982\u679c\u4f60\u6709\u5f88\u5c11\u7684\u5185\u5b58\uff0c\u4f60\u80fd\u5c06\u5b83\u8bbe\u7f6e\u4e3a\u67e5\u8be2\u671f\u671b\u7684\u5927\u5c0f\u3002\uff08\u5373\uff0c\u5ba2\u6237\u53d1\u51fa\u7684SQL\u8bed\u53e5\u671f\u671b\u7684\u957f\u5ea6\u3002\u5982\u679c\u8bed\u53e5\u8d85\u8fc7\u8fd9\u4e2a\u957f\u5ea6\uff0c\u7f13\u51b2\u533a\u81ea\u52a8\u5730\u88ab\u6269\u5927\uff0c\u76f4\u5230max_allowed_packet\u4e2a\u5b57\u8282\u3002\uff09 <br \/>record_buffer <br \/>\u6bcf\u4e2a\u8fdb\u884c\u4e00\u4e2a\u987a\u5e8f\u626b\u63cf\u7684\u7ebf\u7a0b\u4e3a\u5176\u626b\u63cf\u7684\u6bcf\u5f20\u8868\u5206\u914d\u8fd9\u4e2a\u5927\u5c0f\u7684\u4e00\u4e2a\u7f13\u51b2\u533a\u3002\u5982\u679c\u4f60\u505a\u5f88\u591a\u987a\u5e8f\u626b\u63cf\uff0c\u4f60\u53ef\u80fd\u60f3\u8981\u589e\u52a0\u8be5\u503c\u3002 <br \/>sort_buffer <br \/>\u6bcf\u4e2a\u9700\u8981\u8fdb\u884c\u6392\u5e8f\u7684\u7ebf\u7a0b\u5206\u914d\u8be5\u5927\u5c0f\u7684\u4e00\u4e2a\u7f13\u51b2\u533a\u3002\u589e\u52a0\u8fd9\u503c\u52a0\u901fORDER BY\u6216GROUP BY\u64cd\u4f5c\u3002\u89c118.5 MySQL\u5728\u54ea\u513f\u5b58\u50a8\u4e34\u65f6\u6587\u4ef6\u3002 <br \/>table_cache <br \/>\u4e3a\u6240\u6709\u7ebf\u7a0b\u6253\u5f00\u8868\u7684\u6570\u91cf\u3002\u589e\u52a0\u8be5\u503c\u80fd\u589e\u52a0mysqld\u8981\u6c42\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u6570\u91cf\u3002MySQL\u5bf9\u6bcf\u4e2a\u552f\u4e00\u6253\u5f00\u7684\u8868\u9700\u89812\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u89c1\u4e0b\u9762\u5bf9\u6587\u4ef6\u63cf\u8ff0\u7b26\u9650\u5236\u7684\u6ce8\u91ca\u3002\u5bf9\u4e8e\u8868\u7f13\u5b58\u5982\u4f55\u5de5\u4f5c\u7684\u4fe1\u606f\uff0c\u89c110.2.4 MySQL\u600e\u6837\u6253\u5f00\u548c\u5173\u95ed\u8868\u3002 <br \/>tmp_table_size <br \/>\u5982\u679c\u4e00\u5f20\u4e34\u65f6\u8868\u8d85\u51fa\u8be5\u5927\u5c0f\uff0cMySQL\u4ea7\u751f\u4e00\u4e2aThe table tbl_name is full\u5f62\u5f0f\u7684\u9519\u8bef\uff0c\u5982\u679c\u4f60\u505a\u5f88\u591a\u9ad8\u7ea7GROUP BY\u67e5\u8be2\uff0c\u589e\u52a0tmp_table_size\u503c\u3002 <br \/>thread_stack <br \/>\u6bcf\u4e2a\u7ebf\u7a0b\u7684\u6808\u5927\u5c0f\u3002\u7531crash-me\u6d4b\u8bd5\u68c0\u6d4b\u5230\u7684\u8bb8\u591a\u9650\u5236\u4f9d\u8d56\u4e8e\u8be5\u503c\u3002\u7f3a\u7701\u961f\u4e00\u822c\u7684\u64cd\u4f5c\u662f\u8db3\u591f\u5927\u4e86\u3002\u89c110.8 \u4f7f\u7528\u4f60\u81ea\u5df1\u7684\u57fa\u51c6\u3002 <br \/>wait_timeout <br \/>\u670d\u52a1\u5668\u5728\u5173\u95ed\u5b83\u4e4b\u524d\u5728\u4e00\u4e2a\u8fde\u63a5\u4e0a\u7b49\u5f85\u884c\u52a8\u7684\u79d2\u6570\u3002\u4e5f\u53ef\u89c1interactive_timeout\u3002 <br \/>MySQL\u4f7f\u7528\u662f\u5f88\u5177\u4f38\u7f29\u6027\u7684\u7b97\u6cd5\uff0c\u56e0\u6b64\u4f60\u901a\u5e38\u80fd\u7528\u5f88\u5c11\u7684\u5185\u5b58\u8fd0\u884c\u6216\u7ed9MySQL\u66f4\u591a\u7684\u88ab\u5b58\u4ee5\u5f97\u5230\u66f4\u597d\u7684\u6027\u80fd\u3002 <\/p>\n<p>\u5982\u679c\u4f60\u6709\u5f88\u591a\u5185\u5b58\u548c\u5f88\u591a\u8868\u5e76\u4e14\u6709\u4e00\u4e2a\u4e2d\u7b49\u6570\u91cf\u7684\u5ba2\u6237\uff0c\u60f3\u8981\u6700\u5927\u7684\u6027\u80fd\uff0c\u4f60\u5e94\u8be5\u4e00\u4e9b\u8c61\u8fd9\u6837\u7684\u4e1c\u897f\uff1a <\/p>\n<p>shell>; safe_mysqld -O key_buffer=16M -O table_cache=128 &#92;<br \/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; -O sort_buffer=4M -O record_buffer=1M &#038;<\/p>\n<p>\u5982\u679c\u4f60\u6709\u8f83\u5c11\u7684\u5185\u5b58\u548c\u5927\u91cf\u7684\u8fde\u63a5\uff0c\u4f7f\u7528\u8fd9\u6837\u4e00\u4e9b\u4e1c\u897f\uff1a <br \/>shell>; safe_mysqld -O key_buffer=512k -O sort_buffer=100k &#92;<br \/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; -O record_buffer=100k &#038;<\/p>\n<p>\u6216\u751a\u81f3\uff1a <br \/>shell>; safe_mysqld -O key_buffer=512k -O sort_buffer=16k &#92;<br \/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; -O table_cache=32 -O record_buffer=8k -O net_buffer=1K &#038;<\/p>\n<p>\u5982\u679c\u6709\u5f88\u591a\u8fde\u63a5\uff0c\u201c\u4ea4\u6362\u95ee\u9898\u201d\u53ef\u80fd\u53d1\u751f\uff0c\u9664\u975emysqld\u5df2\u7ecf\u88ab\u914d\u7f6e\u6bcf\u4e2a\u8fde\u63a5\u4f7f\u7528\u5f88\u5c11\u7684\u5185\u5b58\u3002\u5f53\u7136\u5982\u679c\u4f60\u5bf9\u6240\u6709\u8fde\u63a5\u6709\u8db3\u591f\u7684\u5185\u5b58\uff0cmysqld\u6267\u884c\u5f97\u66f4\u597d\u3002 <\/p>\n<p>\u6ce8\u610f\uff0c\u5982\u679c\u4f60\u6539\u53d8mysqld\u7684\u4e00\u4e2a\u9009\u9879\uff0c\u5b83\u5b9e\u9645\u4e0a\u53ea\u5bf9\u670d\u52a1\u5668\u7684\u90a3\u4e2a\u4f8b\u5b50\u4fdd\u6301 <\/p>\n<p>\u4e3a\u4e86\u660e\u767d\u4e00\u4e2a\u53c2\u6570\u53d8\u5316\u7684\u6548\u679c\uff0c\u8fd9\u6837\u505a\uff1a <\/p>\n<p>shell>; mysqld -O key_buffer=32m &#8211;help<\/p>\n<p>\u4fdd\u8bc1&#8211;help\u9009\u9879\u662f\u6700\u540e\u4e00\u4e2a\uff1b\u5426\u5219\uff0c\u547d\u4ee4\u884c\u4e0a\u5728\u5b83\u4e4b\u540e\u5217\u51fa\u7684\u4efb\u4f55\u9009\u9879\u7684\u6548\u679c\u5c06\u4e0d\u5728\u53cd\u6620\u5728\u8f93\u51fa\u4e2d\u3002 <\/p>\n<p>10.2.4 MySQL\u600e\u6837\u6253\u5f00\u548c\u5173\u95ed\u6570\u636e\u5e93\u8868<br \/>table_cache, max_connections\u548cmax_tmp_tables\u5f71\u54cd\u670d\u52a1\u5668\u4fdd\u6301\u6253\u5f00\u7684\u6587\u4ef6\u7684\u6700\u5927\u6570\u91cf\u3002\u5982\u679c\u4f60\u589e\u52a0\u8fd9\u4e9b\u503c\u7684\u4e00\u4e2a\u6216\u4e24\u4e2a\uff0c\u4f60\u53ef\u4ee5\u9047\u5230\u4f60\u7684\u64cd\u4f5c\u7cfb\u7edf\u6bcf\u4e2a\u8fdb\u7a0b\u6253\u5f00\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u6570\u91cf\u4e0a\u5f3a\u52a0\u7684\u9650\u5236\u3002\u7136\u800c\uff0c\u4f60\u53ef\u4ee5\u80fd\u5728\u8bb8\u591a\u7cfb\u7edf\u4e0a\u589e\u52a0\u8be5\u9650\u5236\u3002\u8bf7\u6559\u4f60\u7684OS\u6587\u6863\u627e\u51fa\u5982\u4f55\u505a\u8fd9\u4e9b\uff0c\u56e0\u4e3a\u6539\u53d8\u9650\u5236\u7684\u65b9\u6cd5\u5404\u7cfb\u7edf\u6709\u5f88\u5927\u7684\u4e0d\u540c\u3002 <\/p>\n<p>table_cache\u4e0emax_connections\u6709\u5173\u3002\u4f8b\u5982\uff0c\u5bf9\u4e8e200\u4e2a\u6253\u5f00\u7684\u8fde\u63a5\uff0c\u4f60\u5e94\u8be5\u8ba9\u4e00\u5f20\u8868\u7684\u7f13\u51b2\u81f3\u5c11\u6709200 * n\uff0c\u8fd9\u91ccn\u662f\u4e00\u4e2a\u8054\u7ed3(join)\u4e2d\u8868\u7684\u6700\u5927\u6570\u91cf\u3002 <\/p>\n<p>\u6253\u5f00\u8868\u7684\u7f13\u5b58\u53ef\u4ee5\u589e\u52a0\u5230\u4e00\u4e2atable_cache\u7684\u6700\u5927\u503c\uff08\u7f3a\u7701\u4e3a64\uff1b\u8fd9\u53ef\u4ee5\u7528mysqld\u7684-O table_cache=#\u9009\u9879\u6765\u6539\u53d8\uff09\u3002\u4e00\u4e2a\u8868\u7edd\u5bf9\u4e0d\u88ab\u5173\u95ed\uff0c\u9664\u975e\u5f53\u7f13\u5b58\u6ee1\u4e86\u5e76\u4e14\u53e6\u5916\u4e00\u4e2a\u7ebf\u7a0b\u8bd5\u56fe\u6253\u5f00\u4e00\u4e2a\u8868\u65f6\u6216\u5982\u679c\u4f60\u4f7f\u7528mysqladmin refresh\u6216mysqladmin flush-tables\u3002 <\/p>\n<p>\u5f53\u8868\u7f13\u5b58\u6ee1\u65f6\uff0c\u670d\u52a1\u5668\u4f7f\u7528\u4e0b\u5217\u8fc7\u7a0b\u627e\u5230\u4e00\u4e2a\u7f13\u5b58\u5165\u53e3\u6765\u4f7f\u7528\uff1a <\/p>\n<p>\u4e0d\u662f\u5f53\u524d\u4f7f\u7528\u7684\u8868\u88ab\u91ca\u653e\uff0c\u4ee5\u6700\u8fd1\u6700\u5c11\u4f7f\u7528\uff08LRU\uff09\u987a\u5e8f\u3002 <br \/>\u5982\u679c\u7f13\u5b58\u6ee1\u4e86\u5e76\u4e14\u6ca1\u6709\u8868\u53ef\u4ee5\u91ca\u653e\uff0c\u4f46\u662f\u4e00\u4e2a\u65b0\u8868\u9700\u8981\u6253\u5f00\uff0c\u7f13\u5b58\u5fc5\u987b\u4e34\u65f6\u88ab\u6269\u5927\u3002 <br \/>\u5982\u679c\u7f13\u5b58\u5904\u4e8e\u4e00\u4e2a\u4e34\u65f6\u6269\u5927\u72b6\u6001\u5e76\u4e14\u4e00\u4e2a\u8868\u4ece\u5728\u7528\u53d8\u4e3a\u4e0d\u5728\u7528\u72b6\u6001\uff0c\u5b83\u88ab\u5173\u95ed\u5e76\u4ece\u7f13\u5b58\u4e2d\u91ca\u653e\u3002 <br \/>\u5bf9\u6bcf\u4e2a\u5e76\u53d1\u5b58\u53d6\u6253\u5f00\u4e00\u4e2a\u8868\u3002\u8fd9\u610f\u5473\u7740\uff0c\u5982\u679c\u4f60\u8ba92\u4e2a\u7ebf\u7a0b\u5b58\u53d6\u540c\u4e00\u4e2a\u8868\u6216\u5728\u540c\u4e00\u4e2a\u67e5\u8be2\u4e2d\u5b58\u53d6\u8868\u4e24\u6b21(\u7528AS)\uff0c\u8868\u9700\u8981\u88ab\u6253\u5f00\u4e24\u6b21\u3002\u4efb\u4f55\u8868\u7684\u7b2c\u4e00\u6b21\u6253\u5f00\u53602\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\uff1b\u8868\u7684\u6bcf\u4e00\u6b21\u989d\u5916\u4f7f\u7528\u4ec5\u5360\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002\u5bf9\u4e8e\u7b2c\u4e00\u6b21\u6253\u5f00\u7684\u989d\u5916\u63cf\u8ff0\u7b26\u7528\u4e8e\u7d22\u5f15\u6587\u4ef6\uff1b\u8fd9\u4e2a\u63cf\u8ff0\u7b26\u5728\u6240\u6709\u7ebf\u7a0b\u4e4b\u95f4\u5171\u4eab\u3002 <\/p>\n<p>10.2.5 \u5728\u540c\u4e00\u4e2a\u6570\u636e\u5e93\u4e2d\u521b\u5efa\u5927\u91cf\u6570\u636e\u5e93\u8868\u7684\u7f3a\u70b9<br \/>\u5982\u679c\u4f60\u5728\u4e00\u4e2a\u76ee\u5f55\u4e2d\u6709\u8bb8\u591a\u6587\u4ef6\uff0c\u6253\u5f00\u3001\u5173\u95ed\u548c\u521b\u5efa\u64cd\u4f5c\u5c06\u4f1a\u5f88\u6162\u3002\u5982\u679c\u4f60\u6267\u884c\u5728\u8bb8\u591a\u4e0d\u540c\u8868\u4e0a\u7684SELECT\u8bed\u53e5\uff0c\u5f53\u8868\u7f13\u5b58\u6ee1\u65f6\uff0c\u5c06\u6709\u4e00\u70b9\u5f00\u9500\uff0c\u56e0\u4e3a\u5bf9\u6bcf\u4e2a\u5fc5\u987b\u6253\u5f00\u7684\u8868\uff0c\u53e6\u5916\u4e00\u4e2a\u5fc5\u987b\u88ab\u5173\u95ed\u3002\u4f60\u53ef\u4ee5\u901a\u8fc7\u4f7f\u8868\u7f13\u51b2\u66f4\u5927\u4e9b\u6765\u51cf\u5c11\u8fd9\u4e2a\u5f00\u9500\u3002 <\/p>\n<p>10.2.6 \u4e3a\u4ec0\u4e48\u6709\u8fd9\u4e48\u591a\u6253\u5f00\u7684\u8868\uff1f<br \/>\u5f53\u4f60\u8fd0\u884cmysqladmin status\u65f6\uff0c\u4f60\u5c06\u770b\u89c1\u8c61\u8fd9\u6837\u7684\u4e00\u4e9b\u4e1c\u897f\uff1a <\/p>\n<p>Uptime: 426 Running threads: 1 Questions: 11082 Reloads: 1 Open tables: 12<\/p>\n<p>\u5982\u679c\u4f60\u4ec5\u67096\u4e2a\u8868\uff0c\u8fd9\u53ef\u80fd\u6709\u70b9\u4ee4\u4eba\u56f0\u60d1\u3002 <\/p>\n<p>MySQL\u662f\u591a\u7ebf\u7a0b\u7684\uff0c\u56e0\u6b64\u5b83\u53ef\u4ee5\u540c\u65f6\u5728\u540c\u4e00\u4e2a\u8868\u4e0a\u6709\u8bb8\u591a\u8be2\u95ee\u3002\u4e3a\u4e86\u662f2\u4e2a\u7ebf\u7a0b\u5728\u540c\u4e00\u4e2a\u6587\u4ef6\u4e0a\u6709\u4e0d\u540c\u72b6\u6001\u7684\u95ee\u9898\u51cf\u5230\u6700\u5c0f\uff0c\u8868\u7531\u6bcf\u4e2a\u5e76\u53d1\u8fdb\u7a0b\u72ec\u7acb\u5730\u6253\u5f00\u3002\u8fd9\u4e3a\u6570\u636e\u6587\u4ef6\u6d88\u8017\u4e00\u4e9b\u5185\u5b58\u548c\u4e00\u4e2a\u989d\u5916\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002\u7d22\u5f15\u6587\u4ef6\u63cf\u8ff0\u7b26\u5728\u6240\u6709\u7ebf\u7a0b\u4e4b\u95f4\u5171\u4eab\u3002 <\/p>\n<p>10.2.7 MySQL\u600e\u6837\u4f7f\u7528\u5185\u5b58<br \/>\u4e0b\u8868\u6307\u51famysqld\u670d\u52a1\u5668\u4f7f\u7528\u5b58\u50a8\u5668\u7684\u4e00\u4e9b\u65b9\u5f0f\u3002\u5728\u5e94\u7528\u7684\u5730\u65b9\uff0c\u7ed9\u51fa\u4e0e\u5b58\u50a8\u5668\u4f7f\u7528\u76f8\u5173\u7684\u670d\u52a1\u5668\u53d8\u91cf\u7684\u540d\u5b57\u3002 <\/p>\n<p>\u5173\u952e\u5b57\u7f13\u51b2\u533a(\u53d8\u91cfkey_buffer_size)\u7531\u6240\u6709\u7ebf\u7a0b\u5206\u4eab\uff1b\u5f53\u9700\u8981\u65f6\uff0c\u5206\u914d\u670d\u52a1\u5668\u4f7f\u7528\u7684\u5176\u4ed6\u7f13\u51b2\u533a\u3002\u89c110.2.3 \u8c03\u8282\u670d\u52a1\u5668\u53c2\u6570\u3002 <br \/>\u6bcf\u4e2a\u8fde\u63a5\u4f7f\u7528\u4e00\u4e9b\u7ebf\u7a0b\u7279\u5b9a\u7684\u7a7a\u95f4\uff1b\u4e00\u4e2a\u6808(\u7f3a\u770164K\uff0c\u53d8\u91cfthread_stack)\u3001\u4e00\u4e2a\u8fde\u63a5\u7f13\u51b2\u533a(\u53d8\u91cfnet_buffer_length)\u548c\u4e00\u4e2a\u7ed3\u679c\u7f13\u51b2\u533a(\u53d8\u91cfnet_buffer_length)\u3002\u5f53\u9700\u8981\u65f6\uff0c\u8fde\u63a5\u7f13\u51b2\u533a\u548c\u7ed3\u679c\u7f13\u51b2\u533a\u52a8\u6001\u5730\u88ab\u6269\u5927\u5230max_allowed_packet\u3002\u5f53\u4e00\u4e2a\u67e5\u8be2\u6b63\u5728\u8fd0\u884c\u5f53\u524d\u67e5\u8be2\u7684\u4e00\u4e2a\u62f7\u8d1d\u65f6\uff0c\u4e5f\u5206\u914d\u5b57\u7b26\u4e32\u3002 <br \/>\u6240\u6709\u7ebf\u7a0b\u5171\u4eab\u540c\u4e00\u57fa\u5b58\u50a8\u5668\u3002 <br \/>\u76ee\u524d\u8fd8\u6ca1\u6709\u4ec0\u4e48\u662f\u5185\u5b58\u6620\u5c04\u7684(\u9664\u4e86\u538b\u7f29\u8868\uff0c\u4f46\u662f\u90a3\u662f\u53e6\u5916\u4e00\u4e2a\u7684\u6545\u4e8b)\u3002\u8fd9\u662f\u56e0\u4e3a4GB\u768432\u4f4d\u5b58\u50a8\u5668\u7a7a\u95f4\u5bf9\u6700\u5927\u7684\u6570\u636e\u5e93\u6765\u6240\u4e0d\u662f\u8db3\u591f\u5927\u7684\u3002\u5f53\u4e00\u4e2a64\u4f4d\u5bfb\u5740\u7a7a\u95f4\u7684\u7cfb\u7edf\u53d8\u5f97\u66f4\u666e\u904d\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u4e3a\u5185\u5b58\u6620\u5c04\u589e\u52a0\u5168\u9762\u7684\u6301\u3002 <br \/>\u6bcf\u4e2a\u505a\u987a\u5e8f\u626b\u63cf\u7684\u8bf7\u6c42\u5206\u914d\u4e00\u4e2a\u8bfb\u7f13\u51b2\u533a(\u53d8\u91cfrecord_buffer)\u3002 <br \/>\u6240\u6709\u8054\u7ed3\u5747\u7528\u4e00\u904d\u5b8c\u6210\u5e76\u4e14\u5927\u591a\u6570\u8054\u7ed3\u53ef\u4ee5\u751a\u81f3\u4e0d\u7528\u4e00\u5f20\u4e34\u65f6\u8868\u6765\u5b8c\u6210\u3002\u6700\u4e34\u65f6\u7684\u8868\u662f\u57fa\u4e8e\u5185\u5b58\u7684(HEAP)\u8868\u3002\u6709\u8f83\u5927\u8bb0\u5f55\u957f\u5ea6(\u4ee5\u6240\u6709\u5217\u7684\u957f\u5ea6\u4e4b\u548c\u8ba1\u7b97)\u7684\u4e34\u65f6\u8868\u6216\u5305\u542bBLOB\u5217\u7684\u8868\u5728\u78c1\u76d8\u4e0a\u5b58\u50a8\u3002\u5728MySQL\u7248\u672c3.23.2\u524d\u4e00\u4e2a\u95ee\u9898\u662f\u5982\u679c\u4e00\u5f20HEAP\u8868\u8d85\u8fc7tmp_table_size\u7684\u5927\u5c0f\uff0c\u4f60\u5f97\u5230\u9519\u8befThe table tbl_name is full\u3002\u5728\u66f4\u65b0\u7684\u7248\u672c\u4e2d\uff0c\u8fd9\u901a\u8fc7\u5fc5\u8981\u65f6\u81ea\u52a8\u5c06\u5728\u5185\u5b58\u7684(HEAP)\u8868\u8f6c\u53d8\u4e3a\u4e00\u4e2a\u57fa\u4e8e\u78c1\u76d8(MyISAM)\u7684\u8868\u6765\u5904\u7406\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u4f60\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6emysqld\u7684tmp_table_size\u9009\u9879\uff0c\u6216\u901a\u8fc7\u5728\u5ba2\u6237\u7a0b\u5e8f\u4e2d\u8bbe\u7f6eSQL\u7684SQL_BIG_TABLES\u9009\u9879\u589e\u52a0\u4e34\u65f6\u8868\u7684\u5927\u5c0f\u3002\u89c17.25 SET OPTION\u53e5\u6cd5\u3002\u5728MySQL 3.20\u4e2d\uff0c\u4e34\u65f6\u8868\u7684\u6700\u5927\u5c3a\u5bf8\u662frecord_buffer*16\uff0c\u56e0\u6b64\u5982\u679c\u4f60\u6b63\u5728\u4f7f\u7528\u8fd9\u4e2a\u7248\u672c\uff0c\u4f60\u5fc5\u987b\u589e\u52a0record_buffer\u503c\u3002\u4f60\u4e5f\u53ef\u4ee5\u4f7f\u7528&#8211;big-tables\u9009\u9879\u542f\u52a8mysqld\u4ee5\u603b\u5c06\u4e34\u65f6\u8868\u5b58\u50a8\u5728\u78c1\u76d8\u4e0a\uff0c\u7136\u800c\uff0c\u8fd9\u5c06\u5f71\u54cd\u8bb8\u591a\u590d\u6742\u67e5\u8be2\u7684\u901f\u5ea6\u3002 <br \/>\u5927\u591a\u6570\u505a\u6392\u5e8f\u7684\u8bf7\u6c42\u5206\u914d\u4e00\u4e2a\u6392\u5e8f\u7f13\u51b2\u533a\u548c\u4e00\u4e2a\u6216\u4e8c\u4e2a\u4e34\u65f6\u6587\u4ef6\u3002\u89c118.5 MySQL\u5728\u54ea\u513f\u5b58\u50a8\u4e34\u65f6\u6587\u4ef6\u3002 <br \/>\u51e0\u4e4e\u6240\u6709\u7684\u8bed\u6cd5\u5206\u6790\u548c\u8ba1\u7b97\u90fd\u5728\u4e00\u5bb6\u672c\u5730\u5b58\u50a8\u5668\u4e2d\u5b8c\u6210\u3002\u5bf9\u5c0f\u9879\u76ee\u6ca1\u6709\u5185\u5b58\u5f00\u9500\u5e76\u4e14\u4e00\u822c\u7684\u8f83\u6162\u5b58\u50a8\u5668\u5206\u914d\u548c\u91ca\u653e\u88ab\u907f\u514d\u3002\u5185\u5b58\u4ec5\u4e3a\u51fa\u4e4e\u610f\u6599\u7684\u5927\u5b57\u7b26\u4e32\u5206\u914d(\u8fd9\u7528malloc()\u548cfree()\u5b8c\u6210)\u3002 <br \/>\u6bcf\u4e2a\u7d22\u5f15\u6587\u4ef6\u53ea\u88ab\u6253\u5f00\u4e00\u6b21\uff0c\u5e76\u4e14\u6570\u636e\u6587\u4ef6\u4e3a\u6bcf\u4e2a\u5e76\u53d1\u8fd0\u884c\u7684\u7ebf\u7a0b\u6253\u5f00\u4e00\u6b21\u3002\u5bf9\u6bcf\u4e2a\u5e76\u53d1\u7ebf\u7a0b\uff0c\u5206\u914d\u4e00\u4e2a\u8868\u7ed3\u6784\u3001\u5bf9\u6bcf\u5217\u7684\u5217\u7ed3\u6784\u548c\u5927\u5c0f\u4e3a3 * n\u7684\u4e00\u4e2a\u7f13\u51b2\u533a(\u8fd9\u91ccn\u662f\u6700\u5927\u7684\u884c\u957f\u5ea6\uff0c\u4e0d\u7b97BLOB\u5217)\u3002\u4e00\u4e2aBLOB\u4f7f\u75285 \uff5e 8\u4e2a\u5b57\u8282\u52a0\u4e0aBLOB\u6570\u636e\u3002 <br \/>\u5bf9\u6bcf\u4e2a\u6709BLOB\u5217\u7684\u8868\uff0c\u4e00\u4e2a\u7f13\u51b2\u533a\u52a8\u6001\u5730\u88ab\u6269\u5927\u4ee5\u4fbf\u8bfb\u5165\u66f4\u5927\u7684BLOB\u503c\u3002\u5982\u679c\u4f60\u626b\u63cf\u4e00\u4e2a\u8868\uff0c\u5206\u914d\u4e0e\u6700\u5927BLOB\u503c\u4e00\u6837\u5927\u7684\u4e00\u4e2a\u7f13\u51b2\u533a\u3002 <br \/>\u5bf9\u6240\u6709\u5728\u7528\u7684\u8868\u7684\u8868\u5904\u7406\u5668\u88ab\u4fdd\u5b58\u5728\u4e00\u4e2a\u7f13\u5b58\u4e2d\u5e76\u4e14\u4f5c\u4e3a\u4e00\u4e2aFIFO\u7ba1\u7406\u3002\u901a\u5e38\u7f13\u5b58\u670964\u4e2a\u5165\u53e3\u3002\u5982\u679c\u4e00\u4e2a\u8868\u540c\u65f6\u88ab2\u4e2a\u8fd0\u884c\u7684\u7ebf\u7a0b\u4f7f\u7528\uff0c\u7f13\u5b58\u4e3a\u6b64\u5305\u542b2\u4e2a\u5165\u53e3\u3002\u89c110.2.4 MySQL\u5982\u4f55\u6253\u5f00\u548c\u5173\u95ed\u6570\u636e\u5e93\u8868\u3002 <br \/>\u4e00\u4e2amysqladmin flush-tables\u547d\u4ee4\u5173\u95ed\u6240\u6709\u4e0d\u5728\u7528\u7684\u8868\u5e76\u5728\u5f53\u524d\u6267\u884c\u7684\u7ebf\u7a0b\u7ed3\u675f\u65f6\uff0c\u6807\u8bb0\u6240\u6709\u5728\u7528\u7684\u8868\u51c6\u5907\u88ab\u5173\u95ed\u3002\u8fd9\u5c06\u6709\u6548\u5730\u91ca\u653e\u5927\u591a\u6570\u5728\u7528\u7684\u5185\u5b58\u3002 <br \/>ps\u548c\u5176\u4ed6\u7cfb\u7edf\u72b6\u6001\u7a0b\u5e8f\u53ef\u4ee5\u62a5\u5bfcmysqld\u4f7f\u7528\u5f88\u591a\u5185\u5b58\u3002\u8fd9\u53ef\u4ee5\u662f\u5728\u4e0d\u540c\u7684\u5185\u5b58\u5730\u5740\u4e0a\u7684\u7ebf\u7a0b\u6808\u9020\u6210\u7684\u3002\u4f8b\u5982\uff0cSolaris\u7248\u672c\u7684ps\u5c06\u6808\u95f4\u672a\u7528\u7684\u5185\u5b58\u7b97\u4f5c\u5df2\u7528\u7684\u5185\u5b58\u3002\u4f60\u53ef\u4ee5\u901a\u8fc7\u7528swap -s\u68c0\u67e5\u53ef\u7528\u4ea4\u6362\u533a\u6765\u9a8c\u8bc1\u5b83\u3002\u6211\u4eec\u7528\u5546\u4e1a\u5185\u5b58\u6f0f\u6d1e\u63a2\u67e5\u5668\u6d4b\u8bd5\u4e86mysqld\uff0c\u56e0\u6b64\u5e94\u8be5\u6709\u6ca1\u6709\u5185\u5b58\u6f0f\u6d1e\u3002 <\/p>\n<p>10.2.8 MySQL\u600e\u6837\u9501\u5b9a\u6570\u636e\u5e93\u8868<br \/>MySQL\u4e2d\u6240\u6709\u9501\u5b9a\u4e0d\u4f1a\u662f\u6b7b\u9501\u7684\u3002\u8fd9\u901a\u8fc7\u603b\u662f\u5728\u4e00\u4e2a\u67e5\u8be2\u524d\u7acb\u5373\u8bf7\u6c42\u6240\u6709\u5fc5\u8981\u7684\u9501\u5b9a\u5e76\u4e14\u603b\u662f\u4ee5\u540c\u6837\u7684\u987a\u5e8f\u9501\u5b9a\u8868\u6765\u7ba1\u7406\u3002 <\/p>\n<p>\u5bf9WRITE\uff0cMySQL\u4f7f\u7528\u7684\u9501\u5b9a\u65b9\u6cd5\u539f\u7406\u5982\u4e0b\uff1a <\/p>\n<p>\u5982\u679c\u5728\u8868\u4e0a\u6ca1\u6709\u9501\uff0c\u653e\u4e00\u4e2a\u9501\u5728\u5b83\u4e0a\u9762\u3002 <br \/>\u5426\u5219\uff0c\u628a\u9501\u5b9a\u8bf7\u6c42\u653e\u5728\u5199\u9501\u5b9a\u961f\u5217\u4e2d\u3002 <br \/>\u5bf9READ\uff0cMySQL\u4f7f\u7528\u7684\u9501\u5b9a\u65b9\u6cd5\u539f\u7406\u5982\u4e0b\uff1a <\/p>\n<p>\u5982\u679c\u5728\u8868\u4e0a\u6ca1\u6709\u5199\u9501\u5b9a\uff0c\u628a\u4e00\u4e2a\u8bfb\u9501\u5b9a\u653e\u5728\u5b83\u4e0a\u9762\u3002 <br \/>\u5426\u5219\uff0c\u628a\u9501\u8bf7\u6c42\u653e\u5728\u8bfb\u9501\u5b9a\u961f\u5217\u4e2d\u3002 <br \/>\u5f53\u4e00\u4e2a\u9501\u5b9a\u88ab\u91ca\u653e\u65f6\uff0c\u9501\u5b9a\u53ef\u88ab\u5199\u9501\u5b9a\u961f\u5217\u4e2d\u7684\u7ebf\u7a0b\u5f97\u5230\uff0c\u7136\u540e\u662f\u8bfb\u9501\u5b9a\u961f\u5217\u4e2d\u7684\u7ebf\u7a0b\u3002 <\/p>\n<p>\u8fd9\u610f\u5473\u7740\uff0c\u5982\u679c\u4f60\u5728\u4e00\u4e2a\u8868\u4e0a\u6709\u8bb8\u591a\u66f4\u6539\uff0cSELECT\u8bed\u53e5\u5c06\u7b49\u5f85\u76f4\u5230\u6709\u6ca1\u6709\u66f4\u591a\u7684\u66f4\u6539\u3002 <\/p>\n<p>\u4e3a\u4e86\u89e3\u51b3\u5728\u4e00\u4e2a\u8868\u4e2d\u8fdb\u884c\u5f88\u591aINSERT\u548cSELECT\u64cd\u4f5c\u7684\u60c5\u51b5\uff0c\u4f60\u53ef\u5728\u4e00\u5f20\u4e34\u65f6\u8868\u4e2d\u63d2\u5165\u884c\u5e76\u4e14\u5076\u5c14\u7528\u6765\u81ea\u4e34\u65f6\u8868\u7684\u8bb0\u5f55\u66f4\u65b0\u771f\u6b63\u7684\u8868\u3002 <\/p>\n<p>\u8fd9\u53ef\u7528\u4e0b\u5217\u4ee3\u7801\u505a\u5230\uff1a <\/p>\n<p>mysql>; LOCK TABLES real_table WRITE, insert_table WRITE;<br \/>mysql>; insert into real_table select * from insert_table;<br \/>mysql>; delete from insert_table;<br \/>mysql>; UNLOCK TABLES;<\/p>\n<p>\u5982\u679c\u4f60\u5728\u4e00\u4e9b\u7279\u5b9a\u7684\u60c5\u51b5\u5b57\u4e0b\u533a\u5206\u68c0\u7d22\u7684\u4f18\u5148\u6b21\u5e8f\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528LOW_PRIORITY\u9009\u9879\u7684INSERT\u3002\u89c17.14 INSERT\u53e5\u6cd5\u3002 <\/p>\n<p>\u4f60\u4e5f\u80fd\u6539\u53d8\u5728\u201cmysys\/thr_lock.c\u201d\u4e2d\u7684\u9501\u4ee3\u7801\u4ee5\u4f7f\u7528\u4e00\u4e2a\u5355\u4e2a\u961f\u5217\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5199\u9501\u5b9a\u548c\u8bfb\u9501\u5b9a\u5c06\u6709\u540c\u6837\u4f18\u5148\u7ea7\uff0c\u5b83\u53ef\u80fd\u5e2e\u52a9\u4e00\u4e9b\u5e94\u7528\u7a0b\u5e8f\u3002 <\/p>\n<p>10.2.9 \u6570\u636e\u5e93\u8868\u7ea7\u9501\u5b9a\u7684\u95ee\u9898<\/p>\n<p>MySQL\u7684\u8868\u9501\u5b9a\u4ee3\u7801\u662f\u4e0d\u4f1a\u6b7b\u9501\u7684\u3002 <\/p>\n<p>MySQL\u4f7f\u7528\u8868\u7ea7\u9501\u5b9a(\u800c\u4e0d\u662f\u884c\u7ea7\u9501\u5b9a\u6216\u5217\u7ea7\u9501\u5b9a)\u4ee5\u8fbe\u5230\u5f88\u9ad8\u7684\u9501\u5b9a\u901f\u5ea6\u3002\u5bf9\u4e8e\u5927\u8868\uff0c\u8868\u7ea7\u9501\u5b9a\u5bf9\u5927\u591a\u6570\u5e94\u7528\u7a0b\u5e8f\u6765\u8bf4\u6bd4\u884c\u7ea7\u9501\u5b9a\u597d\u4e00\u4e9b\uff0c\u4f46\u662f\u5f53\u7136\u6709\u4e00\u4e9b\u7f3a\u9677\u3002 <\/p>\n<p>\u5728MySQL3.23.7\u548c\u66f4\u9ad8\u7248\u672c\u4e2d\uff0c\u4e00\u4e2a\u4eba\u80fd\u628a\u884c\u63d2\u5165\u5230MyISAM\u8868\u540c\u65f6\u5176\u4ed6\u7ebf\u7a0b\u6b63\u5728\u8bfb\u8be5\u8868\u3002\u6ce8\u610f\uff0c\u76ee\u524d\u53ea\u6709\u5728\u8868\u4e2d\u5185\u6709\u5220\u9664\u7684\u884c\u65f6\u624d\u5de5\u4f5c\u3002 <\/p>\n<p>\u8868\u7ea7\u9501\u5b9a\u4f7f\u5f88\u591a\u7ebf\u7a0b\u80fd\u591f\u540c\u65f6\u8bfb\u4e00\u4e2a\u8868\uff0c\u4f46\u662f\u5982\u679c\u4e00\u4e2a\u7ebf\u7a0b\u60f3\u8981\u5199\u4e00\u4e2a\u8868\uff0c\u5b83\u5fc5\u987b\u9996\u5148\u5f97\u5230\u72ec\u5360\u5b58\u53d6\u6743\u3002\u5728\u66f4\u6539\u671f\u95f4\uff0c\u6240\u6709\u5176\u4ed6\u60f3\u8981\u5b58\u53d6\u8be5\u7279\u5b9a\u8868\u7684\u7ebf\u7a0b\u5c06\u7b49\u5230\u66f4\u6539\u5c31\u7eea\u3002 <\/p>\n<p>\u56e0\u4e3a\u6570\u636e\u5e93\u7684\u66f4\u6539\u901a\u5e38\u88ab\u89c6\u4e3a\u6bd4SELECT\u66f4\u91cd\u8981\uff0c\u66f4\u65b0\u4e00\u4e2a\u8868\u7684\u6240\u6709\u8bed\u53e5\u6bd4\u4ece\u4e00\u4e2a\u8868\u4e2d\u68c0\u7d22\u4fe1\u606f\u7684\u8bed\u53e5\u6709\u66f4\u9ad8\u7684\u4f18\u5148\u7ea7\u3002\u8fd9\u5e94\u8be5\u4fdd\u8bc1\u66f4\u6539\u4e0d\u88ab\u201c\u997f\u6b7b\u201d\uff0c\u56e0\u4e3a\u4e00\u4e2a\u4eba\u9488\u5bf9\u4e00\u4e2a\u7279\u5b9a\u8868\u4f1a\u53d1\u51fa\u5f88\u591a\u7e41\u91cd\u7684\u67e5\u8be2\u3002 <\/p>\n<p>\u4eceMySQL 3.23.7\u5f00\u59cb\uff0c\u4e00\u4e2a\u4eba\u53ef\u4ee5\u80fd\u4f7f\u7528max_write_lock_count\u53d8\u91cf\u5f3a\u5236MySQL\u5728\u4e00\u4e2a\u8868\u4e0a\u4e00\u4e2a\u7279\u5b9a\u6570\u91cf\u7684\u63d2\u5165\u540e\u53d1\u51fa\u4e00\u4e2aSELECT\u3002 <\/p>\n<p>\u5bf9\u6b64\u4e00\u4e2a\u4e3b\u8981\u7684\u95ee\u9898\u5982\u4e0b\uff1a <\/p>\n<p>\u4e00\u4e2a\u5ba2\u6237\u53d1\u51fa\u4e00\u4e2a\u82b1\u5f88\u957f\u65f6\u95f4\u8fd0\u884c\u7684SELECT\u3002 <br \/>\u7136\u540e\u5176\u4ed6\u5ba2\u6237\u5728\u4e00\u4e2a\u4f7f\u7528\u7684\u8868\u4e0a\u53d1\u51fa\u4e00\u4e2aUPDATE\uff1b\u8fd9\u4e2a\u5ba2\u6237\u5c06\u7b49\u5f85\u76f4\u5230SELECT\u5b8c\u6210\u3002 <br \/>\u53e6\u4e00\u4e2a\u5ba2\u6237\u5728\u540c\u4e00\u4e2a\u8868\u4e0a\u53d1\u51fa\u53e6\u4e00\u4e2aSELECT\u8bed\u53e5\uff1b\u56e0\u4e3aUPDATE\u6bd4SELECT\u6709\u66f4\u9ad8\u7684\u4f18\u5148\u7ea7\uff0c\u8be5SELECT\u5c06\u7b49\u5f85UPDATE\u7684\u5b8c\u6210\u3002\u5b83\u4e5f\u5c06\u7b49\u5f85\u7b2c\u4e00\u4e2aSELECT\u5b8c\u6210\uff01 <br \/>\u5bf9\u8fd9\u4e2a\u95ee\u9898\u7684\u4e00\u4e9b\u53ef\u80fd\u7684\u89e3\u51b3\u65b9\u6848\u662f\uff1a <\/p>\n<p>\u8bd5\u7740\u4f7fSELECT\u8bed\u53e5\u8fd0\u884c\u5f97\u66f4\u5feb\uff1b\u4f60\u53ef\u80fd\u5fc5\u987b\u521b\u5efa\u4e00\u4e9b\u6458\u8981(summary)\u8868\u505a\u5230\u8fd9\u70b9\u3002 <br \/>\u7528&#8211;low-priority-updates\u542f\u52a8mysqld\u3002\u8fd9\u5c06\u7ed9\u6240\u6709\u66f4\u65b0(\u4fee\u6539)\u4e00\u4e2a\u8868\u7684\u8bed\u53e5\u4ee5\u6bd4SELECT\u8bed\u53e5\u4f4e\u7684\u4f18\u5148\u7ea7\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5728\u5148\u524d\u60c5\u5f62\u7684\u6700\u540e\u7684SELECT\u8bed\u53e5\u5c06\u5728INSERT\u8bed\u53e5\u524d\u6267\u884c\u3002 <br \/>\u4f60\u53ef\u4ee5\u7528LOW_PRIORITY\u5c5e\u6027\u7ed9\u4e0e\u4e00\u4e2a\u7279\u5b9a\u7684INSERT\u3001UPDATE\u6216DELETE\u8bed\u53e5\u8f83\u4f4e\u4f18\u5148\u7ea7\u3002 <br \/>\u4e3amax_write_lock_count\u6307\u5b9a\u4e00\u4e2a\u4f4e\u503c\u6765\u542f\u52a8mysqld\u4f7f\u5f97\u5728\u4e00\u5b9a\u6570\u91cf\u7684WRITE\u9501\u5b9a\u540e\u7ed9\u51faREAD\u9501\u5b9a\u3002 <br \/>\u901a\u8fc7\u4f7f\u7528SQL\u547d\u4ee4\uff1aSET SQL_LOW_PRIORITY_UPDATES=1\uff0c\u4f60\u53ef\u4ece\u4e00\u4e2a\u7279\u5b9a\u7ebf\u7a0b\u6307\u5b9a\u6240\u6709\u7684\u66f4\u6539\u5e94\u8be5\u7531\u7528\u4f4e\u4f18\u5148\u7ea7\u5b8c\u6210\u3002\u89c17.25 SET OPTION\u53e5\u6cd5\u3002 <br \/>\u4f60\u53ef\u4ee5\u7528HIGH_PRIORITY\u5c5e\u6027\u6307\u660e\u4e00\u4e2a\u7279\u5b9aSELECT\u662f\u5f88\u91cd\u8981\u7684\u3002\u89c17.12 SELECT\u53e5\u6cd5\u3002 <br \/>\u5982\u679c\u4f60\u6709\u5173\u4e8eINSERT\u7ed3\u5408SELECT\u7684\u95ee\u9898\uff0c\u5207\u6362\u5230\u4f7f\u7528\u65b0\u7684MyISAM\u8868\uff0c\u56e0\u4e3a\u5b83\u4eec\u652f\u6301\u5e76\u53d1\u7684SELECT\u548cINSERT\u3002 <br \/>\u5982\u679c\u4f60\u4e3b\u8981\u6df7\u5408INSERT\u548cSELECT\u8bed\u53e5\uff0cDELAYED\u5c5e\u6027\u7684INSERT\u5c06\u53ef\u80fd\u89e3\u51b3\u4f60\u7684\u95ee\u9898\u3002\u89c17.14 INSERT\u53e5\u6cd5\u3002 <br \/>\u5982\u679c\u4f60\u6709\u5173\u4e8eSELECT\u548cDELETE\u7684\u95ee\u9898\uff0cLIMIT\u9009\u9879\u7684DELETE\u53ef\u4ee5\u5e2e\u52a9\u4f60\u3002\u89c17.11 DELETE\u53e5\u6cd5\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>10.2.3 \u8c03\u8282\u670d\u52a1\u5668\u53c2\u6570\u4f60\u80fd\u7528\u8fd9\u4e2a\u547d\u4ee4\u5f97\u5230mysqld\u670d\u52a1\u5668\u7f3a\u7701\u7f13\u51b2\u533a\u5927\u5c0f\uff1a shell>; mysqld <a href='https:\/\/www.icocean.com\/blog\/?p=1995' class='excerpt-more'>[&#8230;]<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24],"tags":[366,392,1870,1881,3208,2391],"class_list":["post-1995","post","type-post","status-publish","format-standard","hentry","category-lamp","tag-mysql","tag-392","tag-1870","tag-1881","tag-3208","tag-2391","category-24-id","post-seq-1","post-parity-odd","meta-position-corners","fix"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1995","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1995"}],"version-history":[{"count":0,"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1995\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1995"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1995"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.icocean.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1995"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}