{"id":2131,"date":"2012-05-14T05:57:50","date_gmt":"2012-05-14T05:57:50","guid":{"rendered":"http:\/\/enjoyasp.net\/?p=2131"},"modified":"2012-05-15T09:23:45","modified_gmt":"2012-05-15T09:23:45","slug":"%e6%89%a7%e8%a1%8c%e8%ae%a1%e5%88%92%e7%bc%93%e5%ad%98","status":"publish","type":"post","link":"https:\/\/enjoyasp.net\/index.php\/2012\/05\/14\/%e6%89%a7%e8%a1%8c%e8%ae%a1%e5%88%92%e7%bc%93%e5%ad%98\/","title":{"rendered":"\u6267\u884c\u8ba1\u5212\u7f13\u5b58"},"content":{"rendered":"

\u6267\u884c\u8ba1\u5212\u7f16\u8bd1\u662f\u9700\u8981\u65f6\u95f4\u7684\uff0c\u4e3a\u4e86\u63d0\u9ad8\u6548\u7528\u7387\uff0c\u662f\u8981\u7f13\u5b58\u7684\uff0c\u53ef\u7528\u5982\u4e0b\u65b9\u5f0f\u67e5\u770b\uff1a
\n–\u67e5\u770b\u6267\u884c\u8ba1\u5212\u7684\u7f13\u5b58<\/p>\n

\r\nSELECT UseCounts,RefCounts, Cacheobjtype, Objtype,dbid,\r\nISNULL(DB_NAME(dbid),'ResourceDB') AS DatabaseName, TEXT AS SQL\r\nFROM sys.dm_exec_cached_plans\r\nCROSS APPLY sys.dm_exec_sql_text(plan_handle)\r\nORDER BY dbid,usecounts DESC;\r\n\r\n SELECT cacheobjtype,objtype,sql FROM sys.syscacheobjects a\r\n WHERE cacheobjtype = 'compiled plan' AND dbid = 7\r\n\r\n\r\n<\/pre>\n
\n 
\n–\u6e05\u7a7a\u6267\u884c\u8ba1\u5212\u7f13\u5b58
\nDBCC FREEPROCCACHE
\nGO
\n–\u4ece\u7f13\u5b58\u4e2d\u6e05\u9664\u7ed9\u5b9a\u6570\u636e\u5e93\u7684\u8ba1\u5212\u7f13\u5b58
\nDBCC FLUSHPROCINDB(<dbid>)
\nGO<\/p>\n
\u6267\u884c\u8ba1\u5212\u91cd\u65b0\u7f16\u8bd1\u653e\u5230\u7f13\u5b58\u4e2d\u7684\u65f6\u673a\uff1a
\n1\uff0c\u8868\u6216\u89c6\u56fe\u7684\u67b6\u6784\u53d1\u751f\u4e86\u66f4\u6539\uff0c\u7d22\u5f15\u53d1\u751f\u4e86\u6539\u53d8\u9020\u6210\u7edf\u8ba1\u4fe1\u606f\u53d1\u751f\u66f4\u6539\u3002
\n2\uff0c\u8fd0\u884c\u4e86sp_recompile
\n3,\u6267\u884c\u8ba1\u5212\u88ab\u6e05\u9664\uff0c\u5982\u670d\u52a1\u5668\u91cd\u542f\uff0c\u670d\u52a1\u91cd\u542f\uff0c\u653e\u5728\u5185\u5b58\u4e2d\u7684\u6267\u884c\u8ba1\u5212\u5c31\u4f1a\u88ab\u6e05\u7a7a\u3002
\n4,\u7f13\u5b58\u4f1a\u7528LRU\u7b97\u6cd5\u627e\u51fa\u5f88\u5c11\u4f7f\u7528\u7684\uff0c\u7136\u540e\u4ece\u5185\u5b58\u4e2d\u5220\u9664\uff0c\u5728sys.dm_exec_query_stats\u4e2d\u6709\u4e00\u5b57\u6bb5creation_time\u6807\u8bc6\u8ba1\u5212\u7684\u521b\u5efa\u65f6\u95f4\uff0c\u4e00\u822c\u4e00\u3001\u4e24\u4e2a\u5c0f\u65f6\u5c31\u4f1a\u91cd\u65b0\u5efa\u7acb\u4e00\u4efd\u7684\u3002
\n\u53ef\u901a\u8fc7\u89c2\u5bdf\u4ee5\u4e0b\u4e8b\u4ef6\u770b\u7f13\u5b58\u7684\u53d8\u66f4\u3002SP:CacheInsert SP:CacheMiss SP:CacheHit<\/p>\n
\u6267\u884c\u8ba1\u5212\u8981\u4fdd\u6301\u91cd\u7528\uff0c\u4ee5\u63d0\u9ad8\u5229\u7528\u7387\uff0c\u53ef\u4ee5\u67e5\u51fa\u7ecf\u5e38\u91cd\u65b0\u7f16\u8bd1\u7684sql\u4ee5\u505a\u4f18\u5316\uff0c\u5f53\u7136\u91cd\u7528\u5e76\u4e0d\u4e00\u5b9a\u597d\uff0c\u56e0\u4e3a\u6267\u884c\u8ba1\u5212\u4e0d\u9002\u5408\uff0c\u5982\u53c2\u6570\u5316\u95ee\u9898\u7b49\u3002<\/p>\n
\r\nsys.dm_exec_query_stats \u6709\u4e00\u4e2a\u680f\u4f4dplan_generation_num\uff0c\u8ba1\u5212\u7f16\u8bd1\u6b21\u6570\uff0c\u53ef\u7528\u6b64\u6765\u5206\u6790\u6700\u5e38\u7f16\u8bd1\u7684\u8ba1\u5212\u3002\r\nselect top 25\r\n    plan_generation_num,\r\n    SUBSTRING(qt.text,qs.statement_start_offset\/2+1,\r\n        (case when qs.statement_end_offset = -1\r\n        then DATALENGTH(qt.text)\r\n        else qs.statement_end_offset end -qs.statement_start_offset)\/2 + 1)\r\n        as stmt_executing,\r\n    qt.text,\r\n    execution_count,\r\n    sql_handle,\r\n    dbid,\r\n    db_name(dbid) DBName,\r\n    objectid,\r\n    object_name(objectid,dbid) ObjectName\r\nfrom sys.dm_exec_query_stats as qs\r\n    Cross apply sys.dm_exec_sql_text(sql_handle) qt\r\nwhere plan_generation_num >1\r\n--AND qs.last_execution_time >='2011-08-28 10:00' \u9650\u5b9a\u65f6\u95f4\r\norder by plan_generation_num desc\r\n\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
\u6267\u884c\u8ba1\u5212\u7f16\u8bd1\u662f\u9700\u8981\u65f6\u95f4\u7684\uff0c\u4e3a\u4e86\u63d0\u9ad8\u6548\u7528\u7387\uff0c\u662f\u8981\u7f13\u5b58\u7684\uff0c\u53ef\u7528\u5982\u4e0b\u65b9\u5f0f\u67e5\u770b\uff1a –\u67e5\u770b\u6267\u884c\u8ba1\u5212\u7684\u7f13\u5b58 S […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[36],"tags":[],"class_list":["post-2131","post","type-post","status-publish","format-standard","hentry","category-sql-server"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/posts\/2131","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/comments?post=2131"}],"version-history":[{"count":0,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/posts\/2131\/revisions"}],"wp:attachment":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/media?parent=2131"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/categories?post=2131"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/tags?post=2131"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}