{"id":1205,"date":"2014-05-22T08:39:38","date_gmt":"2014-05-22T00:39:38","guid":{"rendered":"http:\/\/www.yallonking.com\/?p=1205"},"modified":"2014-05-23T10:57:19","modified_gmt":"2014-05-23T02:57:19","slug":"oracle%e8%b5%84%e6%ba%90%e7%ae%a1%e7%90%86%e5%99%a8%e7%ae%80%e4%bb%8b%e5%8f%8a%e7%ae%80%e5%8d%95%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"http:\/\/www.yallonking.com\/?p=1205","title":{"rendered":"oracle\u8d44\u6e90\u7ba1\u7406\u5668\u7b80\u4ecb\u53ca\u7b80\u5355\u4f7f\u7528"},"content":{"rendered":"

oracle\u8d44\u6e90\u7ba1\u7406\u5668\u7b80\u4ecb\uff1a
\noracle\u8d44\u6e90\u7ba1\u7406\u5668\u53ef\u4ee5\u5bf9\u5c5e\u4e8e\u4e00\u4e2a\u7279\u5b9a\u7ec4\u7684\u6240\u6709\u7528\u6237\u7684cpu\uff0c\u6267\u884c\u65f6\u957f\uff0c\u7a7a\u95f2\u4f1a\u8bdd\u7b49\u5f85\u65f6\u957f\uff0c\u5360\u7528undo\u5927\u5c0f\uff0c\u5e76\u53d1\u6570\u7b49\u8d44\u6e90\u8fdb\u884c\u9650\u5236\uff0c\u5e76\u53ef\u7075\u6d3b\u5c06\u5f53\u524d\u7ec4\u5207\u6362\u81f3\u5176\u4ed6\u8d44\u6e90\u7ec4\u3002
\n\u8be6\u7ec6\u89c1\u4e0b\u8868
\n\"resource_manager\"<\/a><\/p>\n

\u4e0b\u8fb9\u5c31\u662f\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528 oracle \u7684\u8d44\u6e90\u7ba1\u7406\u5668\u63a7\u5236\u4f7f\u957f\u8017\u65f6\u7684sql\u67e5\u8be2\uff08\u5176\u4e2d\u4e5f\u8bbe\u7f6e\u4e86\u4f1a\u8bdd\u6700\u5927\u7684cpu\u4f7f\u7528\u7387\uff09\u3002<\/p>\n

\u9996\u5148\u521b\u5efa2\u4e2a\u6d4b\u8bd5\u8868<\/p>\n

\r\nSQL> sho user\r\nUSER is "OLTP_USER"\r\nSQL> create table t1 as select owner,object_name from sys.dba_objects;\r\n\r\nTable created.\r\n\r\nSQL> insert into t1 select * from t1;\r\n\r\n9970 rows created.\r\n\r\nSQL> \/\r\n\r\n19940 rows created.\r\n\r\nSQL> commit;\r\n\r\nCommit complete.\r\n\r\nSQL> create table t2 as select * from t1;\r\n\r\nTable created.\r\n<\/pre>\n
\u6ce8\u610f\uff1a\u4e0a\u8fb9\u521b\u5efa\u76842\u4e2a\u6d4b\u8bd5\u8868\u7684\u5217\u5b58\u5728\u5927\u91cf\u91cd\u590d\u503c\u3002<\/p>\n
\u5c06\u6570\u636e\u5757\u4ece\u5185\u5b58\u4e2d\u5237\u65b0\u51fa\u53bb\uff0c\u5c06\u6d4b\u8bd5\u8bef\u5dee\u964d\u5230\u6700\u4f4e<\/p>\n
\r\nSQL> alter system flush buffer_cache;\r\n\r\nSystem altered.\r\n<\/pre>\n
\u4f7f\u7528\u7b1b\u5361\u5c14\u79ef\u6a21\u62df\u4e00\u4e2a\u957f\u8017\u65f6\u7684sql\u67e5\u8be2<\/p>\n
\r\nSQL> set timing on\r\nSQL> select count(*) from t1,t2 where t1.owner=t2.owner;\r\n\r\n  COUNT(*)\r\n----------\r\n 794796640\r\n\r\nElapsed: 00:00:49.64\r\n<\/pre>\n
\u4e0b\u8fb9\u6211\u4eec\u901a\u8fc7oracle\u8d44\u6e90\u7ba1\u7406\u5668\u6765\u63a7\u5236\u8be5\u7c7b\u957f\u8017\u65f6\u7684sql\u67e5\u8be2\u3002
\n\u521b\u5efa\u4e00\u4e2a\u8d44\u6e90\u7ec4<\/p>\n
\r\nSQL> SHO USER\r\nUSER is "SYS"\r\nSQL> begin   \r\n  2  DBMS_RESOURCE_MANAGER.CLEAR_PENDING_AREA;\r\n  3  DBMS_RESOURCE_MANAGER.CREATE_PENDING_AREA;\r\n  4  DBMS_RESOURCE_MANAGER.CREATE_CONSUMER_GROUP(CONSUMER_GROUP => 'MAX_EXEC_TIME_GRP',COMMENT=> 'MAX_EXEC_TIME_GRP');\r\n  5  DBMS_RESOURCE_MANAGER.SUBMIT_PENDING_AREA;\r\n  6  end;\r\n  7  \/\r\n\r\nPL\/SQL procedure successfully completed.\r\n<\/pre>\n
\u8d4b\u4e88\u7528\u6237\u6743\u9650<\/p>\n
\r\nSQL> EXEC DBMS_RESOURCE_MANAGER_PRIVS.GRANT_SWITCH_CONSUMER_GROUP ('oltp_user','MAX_EXEC_TIME_GRP', false);\r\n\r\nPL\/SQL procedure successfully completed.\r\n<\/pre>\n
\u8bbe\u7f6e\u8d44\u6e90\u7ec4\u6620\u5c04<\/p>\n
\r\nSQL> begin   \r\n  2  DBMS_RESOURCE_MANAGER.CLEAR_PENDING_AREA;\r\n  3  DBMS_RESOURCE_MANAGER.CREATE_PENDING_AREA;\r\n  4  DBMS_RESOURCE_MANAGER.VALIDATE_PENDING_AREA;\r\n  5  DBMS_RESOURCE_MANAGER.SET_CONSUMER_GROUP_MAPPING(DBMS_RESOURCE_MANAGER.ORACLE_USER,'OLTP_USER','MAX_EXEC_TIME_GRP');\r\n  6  DBMS_RESOURCE_MANAGER.SUBMIT_PENDING_AREA;\r\n  7  end;\r\n  8  \/\r\n\r\nPL\/SQL procedure successfully completed.\r\n<\/pre>\n
\u521b\u5efa\u8d44\u6e90\u8ba1\u5212<\/p>\n
\r\nSQL> begin\r\n  2  DBMS_RESOURCE_MANAGER.CLEAR_PENDING_AREA;\r\n  3  DBMS_RESOURCE_MANAGER.CREATE_PENDING_AREA;\r\n  4  DBMS_RESOURCE_MANAGER.CREATE_PLAN(PLAN => 'MAX_EXEC_TIME_PLAN',COMMENT => 'MAX_EXEC_TIME_PLAN');\r\n  5  DBMS_RESOURCE_MANAGER.CREATE_PLAN_DIRECTIVE\r\n  6  (\r\n  7  PLAN => 'MAX_EXEC_TIME_PLAN',\r\n  8  GROUP_OR_SUBPLAN => 'MAX_EXEC_TIME_GRP',\r\n  9  COMMENT    => '',\r\n 10  CPU_P1     => 60,\r\n 11  MAX_EST_EXEC_TIME  => 5\t\t\t\/\/\u5141\u8bb8\u4f1a\u8bdd\u6267\u884c\u6700\u5927\u7684\u65f6\u95f4\uff0c\u5355\u4f4d\u662f\u79d2\r\n 12  );  \r\n 13  DBMS_RESOURCE_MANAGER.CREATE_PLAN_DIRECTIVE\r\n 14  (\r\n 15  PLAN => 'MAX_EXEC_TIME_PLAN',\r\n 16  GROUP_OR_SUBPLAN => 'OTHER_GROUPS',\r\n 17  COMMENT    => 'OTHER_GROUPS',\r\n 18  CPU_P1     => 40\r\n 19  );  \r\n 20  DBMS_RESOURCE_MANAGER.SUBMIT_PENDING_AREA;\r\n 21  end;\r\n 22  \/\r\n\r\nPL\/SQL procedure successfully completed.\r\n<\/pre>\n
\u4f7f\u8d44\u6e90\u8ba1\u5212\u751f\u6548<\/p>\n
\r\nSQL> exec DBMS_RESOURCE_MANAGER.SWITCH_PLAN(plan_name=>'MAX_EXEC_TIME_PLAN',sid=>'yallonking');\r\n\r\nPL\/SQL procedure successfully completed.\r\n\r\n<\/pre>\n
\u518d\u6b21\u6d4b\u8bd5\u957f\u8017\u65f6sql\u67e5\u8be2<\/p>\n
\r\nSQL> show user\r\nUSER is "OLTP_USER"\r\nSQL> alter system flush buffer_cache;\r\n\r\nSystem altered.\r\n\r\nSQL> select count(*) from t1,t2 where t1.owner=t2.owner;\r\nselect count(*) from t1,t2 where t1.owner=t2.owner\r\n                     *\r\nERROR at line 1:\r\nORA-07455: estimated execution time (14 secs), exceeds limit (5 secs)\r\n\r\nSQL> select count(*) from t1\r\n  2  union all\r\n  3  select count(*) from t2;\r\n\r\n  COUNT(*)\r\n----------\r\n     39880\r\n     39880\r\n\r\nElapsed: 00:00:00.01\r\n<\/pre>\n
\u6ce8\u610f\uff1a\u8be5\u5904\u8d44\u6e90\u7ba1\u7406\u5668\u9884\u8ba1\u7b2c\u4e00\u4e2a\u67e5\u8be2\u9700\u8981\u8017\u65f614s\uff08\u5b9e\u9645\u6267\u884c\u6240\u9700\u65f6\u95f4\u53ef\u80fd\u6bd45s\u5927\u6216\u8005\u5c0f\uff0c\u540e\u8fb9\u4f1a\u8bc1\u5b9e\uff09\uff0c\u56e0\u5176\u5927\u4e8e\u8bbe\u7f6e\u76845s\uff0c\u6240\u4ee5\u672a\u5141\u8bb8\u8be5sql\u7ee7\u7eed\u6267\u884c\uff0c\u800c\u662f\u7ec8\u6b62\u67e5\u8be2\u5e76\u8fd4\u56de\u4e00\u5b9a\u7684\u4fe1\u606f\u3002
\n\u800c\u5e76\u6ca1\u6709\u9650\u5236\u5176\u4ed6\u9884\u4f30\u6267\u884c\u65f6\u95f4\u5c0f\u4e8e5s\u7684\u67e5\u8be2\u3002<\/p>\n
\u4e0b\u8fb9\u4f7f\u8be5\u8d44\u6e90\u8ba1\u5212\u5931\u6548\uff0c\u8fdb\u884c\u5bf9\u6bd4<\/p>\n
\r\nSQL> show user\r\nUSER is "SYS"\r\nSQL> exec DBMS_RESOURCE_MANAGER.SWITCH_PLAN(plan_name=>'',sid=>'yallonking');\r\n\r\nPL\/SQL procedure successfully completed.\r\n\r\nSQL> sho user\r\nUSER is "OLTP_USER"\r\nSQL> alter system flush buffer_cache;\r\n\r\nSystem altered.\r\n\r\nSQL> set timing on\r\nSQL> select count(*) from t1,t2 where t1.owner=t2.owner;\r\n\r\n  COUNT(*)\r\n----------\r\n 794796640\r\n\r\nElapsed: 00:00:54.66\r\n<\/pre>\n
\u6ce8\u610f\uff1a\u6b64\u5904\u5df2\u6062\u590d\u6b63\u5e38\u7684\u67e5\u8be2\u3002<\/p>\n
\u5bf9\u4e8e\u8d44\u6e90\u7ba1\u7406\u5668\u6765\u8bf4\uff0c\u5176\u5bf9sql\u6267\u884c\u7684\u65f6\u95f4\u53ea\u662f\u9884\u4f30\uff0c\u5e76\u4e0d\u662f\u5b9e\u9645\u8fd0\u884c\u7684\u65f6\u95f4\u3002
\n\u4e0b\u8fb9\u662f\u5728\u8d44\u6e90\u7ba1\u7406\u5668\u751f\u6548\u60c5\u51b5\u4e0b\u7684\u67e5\u8be2<\/p>\n
\r\nSQL> select count(*) from t1,t2 where rownum<2;\r\nselect count(*) from t1,t2 where rownum<2\r\n                     *\r\nERROR at line 1:\r\nORA-07455: estimated execution time (20855 secs), exceeds limit (5 secs)\r\n<\/pre>\n
\u4f46\u662f\u8be5sql\u5728\u8d44\u6e90\u7ba1\u7406\u5668\u5931\u6548\u7684\u60c5\u51b5\u4e0b\uff0c\u5b9e\u9645\u6267\u884c\u5374\u5982\u4e0b\uff1a<\/p>\n
\r\nSQL> select count(*) from t1,t2 where rownum<2;\r\n\r\n  COUNT(*)\r\n----------\r\n         1\r\n\r\nElapsed: 00:00:00.01\r\n<\/pre>\n
\u6ce8\u610f\uff1a\u6b64\u5904\u5b9e\u9645\u6267\u884c\u7528\u65f6\u4e0d\u52301s\uff0c\u4f46\u662f\u5728\u4e0a\u8fb9\u8d44\u6e90\u7ba1\u7406\u5668\u9884\u4f30\u7684\u5374\u662f20855s\u3002<\/p>\n
\u5220\u9664\u8d44\u6e90\u7ec4\u548c\u8d44\u6e90\u8ba1\u5212<\/p>\n
\r\nSQL> show user\r\nUSER is "SYS"\r\nSQL> begin   \r\n  2  DBMS_RESOURCE_MANAGER.CLEAR_PENDING_AREA;\r\n  3  DBMS_RESOURCE_MANAGER.CREATE_PENDING_AREA;\r\n  4  DBMS_RESOURCE_MANAGER.DELETE_PLAN(PLAN => 'MAX_EXEC_TIME_PLAN');\r\n  5  DBMS_RESOURCE_MANAGER.DELETE_CONSUMER_GROUP(CONSUMER_GROUP => 'MAX_EXEC_TIME_GRP');\r\n  6  DBMS_RESOURCE_MANAGER.SUBMIT_PENDING_AREA;\r\n  7  end;\r\n  8  \/\r\n\r\nPL\/SQL procedure successfully completed.\r\n\r\n<\/pre>\n
\u81f3\u6b64\uff0c\u5168\u90e8OK\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
oracle\u8d44\u6e90\u7ba1\u7406\u5668\u7b80\u4ecb\uff1a oracle\u8d44\u6e90\u7ba1\u7406\u5668\u53ef\u4ee5\u5bf9\u5c5e\u4e8e\u4e00\u4e2a\u7279\u5b9a\u7ec4\u7684\u6240\u6709\u7528\u6237\u7684cpu\uff0c\u6267\u884c\u65f6\u957f\uff0c\u7a7a\u95f2\u4f1a\u8bdd […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[87,37],"tags":[258],"_links":{"self":[{"href":"http:\/\/www.yallonking.com\/index.php?rest_route=\/wp\/v2\/posts\/1205"}],"collection":[{"href":"http:\/\/www.yallonking.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.yallonking.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.yallonking.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.yallonking.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1205"}],"version-history":[{"count":9,"href":"http:\/\/www.yallonking.com\/index.php?rest_route=\/wp\/v2\/posts\/1205\/revisions"}],"predecessor-version":[{"id":1218,"href":"http:\/\/www.yallonking.com\/index.php?rest_route=\/wp\/v2\/posts\/1205\/revisions\/1218"}],"wp:attachment":[{"href":"http:\/\/www.yallonking.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1205"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.yallonking.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1205"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.yallonking.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1205"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}