{"id":1453,"date":"2019-03-02T10:37:36","date_gmt":"2019-03-02T02:37:36","guid":{"rendered":"http:\/\/www.821121.com\/?p=1453"},"modified":"2021-03-02T10:43:45","modified_gmt":"2021-03-02T02:43:45","slug":"oracle-11gr2%e7%bb%8f%e5%b8%b8%e4%bf%ae%e6%94%b9%e7%9a%84%e9%9a%90%e5%90%ab%e5%8f%82%e6%95%b0","status":"publish","type":"post","link":"http:\/\/www.821121.com\/?p=1453","title":{"rendered":"ORACLE 11GR2\u7ecf\u5e38\u4fee\u6539\u7684\u9690\u542b\u53c2\u6570"},"content":{"rendered":"

ORACLE 11GR2\u7ecf\u5e38\u4fee\u6539\u7684\u9690\u542b\u53c2\u6570<\/h1>\n
alter system set "_PX_use_large_pool" = true scope=spfile;\nalter system set "_clusterwide_global_transactions" = false scope=spfile;\nalter system set "_gc_defer_time" = 3 scope=spfile;\nalter system set "_resource_manager_always_off" = true scope=spfile;\nalter system set "_resource_manager_always_on"  = false scope=spfile;\nalter system set "_serial_direct_read" = never scope=spfile;\nalter system set "_cleanup_rollback_entries" = 400 scope=spfile;\nalter system set "_optimizer_use_feedback" = false scope=spfile;\nalter system set "_dbms_sql_security_level" =0 scope=spfile;\nalter system set "_bloom_pruning_enabled" = false scope=spfile;\nalter system set "_gc_policy_time" = 0 scope=spfile;\nalter system set "_bloom_filter_enabled" = false scope=spfile;\nalter system set "_gc_read_mostly_locking" = false scope=spfile;\nalter system set "_gc_undo_affinity" = false scope=spfile;\nalter system set "_smu_debug_mode" = 134217728 scope=spfile;\nalter system set "_undo_autotune" = false scope=spfile;\nalter system set deferred_segment_creation = false scope=spfile;\nalter system set Audit_trail = none scope=spfile;\nalter system set event='28401 trace name context forever,level 1' scope=spfile;\nalter system set "_optimizer_extended_cursor_sharing_rel"=none;\nalter system set "_optimizer_extended_cursor_sharing"=none;\nalter system set "_optimizer_adaptive_cursor_sharing"=false;<\/code><\/pre>\n
\u53c2\u6570\u91ca\u4e49\uff1a<\/h1>\n
\u4e00\u3001_PX_use_large_pool<\/h2>\n
\u5e76\u884c\u6267\u884c\u4ece\u5c5e\u8fdb\u7a0b\u4e00\u8d77\u5de5\u4f5c\u65f6\u4f1a\u4ea4\u6362\u6570\u636e\u548c\u4fe1\u606f\uff0c\u6240\u4ee5\u6211\u4eec\u9700\u8981\u4eceshared pool\u6216large pool\u4e2d\u5206\u914d\u5185\u5b58\uff0c
\n\u8fd9\u4e2a\u53d6\u51b3\u4e8ePARALLEL_AUTOMATIC_TUNING\u53c2\u6570\u503c\u7684\u8bbe\u7f6e\uff0c_PX_use_large_pool\u6240\u8d77\u7684\u4f5c\u7528\u8ddfPARALLEL_AUTOMATIC_TUNING\u53c2\u6570\u5dee\u4e0d\u591a\u3002
\n\u5f53PARALLEL_AUTOMATIC_TUNING=TRUE\u65f6\u4ecelarge pool\u4e2d\u5206\u914d\u5185\u5b58\uff0c\u5426\u5219\u4eceshared pool\u5206\u914d\u3002
\n10g\u4e2d,PX\u4fe1\u606f\u7f13\u5b58\u5728large pool\u4e2d\u5206\u914d\uff0c\u5982\u679c\uff1a
\na.) parallel_automatic_tuning = true (\u5f03\u7528)
\nor
\nb.) _PX_use_large_pool = true
\nor
\nc.) sga_target is set<\/p>\n
11g\u4e2d,PX\u4fe1\u606f\u7f13\u5b58\u5728large pool\u4e2d\u5206\u914d\uff0c\u5982\u679c\uff1a
\na.) parallel_automatic_tuning = true (\u5f03\u7528)
\nor
\nb.) _PX_use_large_pool = true
\nor
\nc.)  SGA memory is auto tuned (sga_target or memory_target)<\/p>\n
\u4e8c\u3001_clusterwide_global_transactions<\/h2>\n
\u96c6\u7fa4\u8303\u56f4\u5168\u5c40\u6027\u4e8b\u52a1(Clusterwide global transactions)\u662f11g\u7684\u65b0\u7279\u6027\uff0c\u5176\u5bb9\u8bb8XA\u4e8b\u52a1(XA\u5206\u5e03\u5f0f\u4e8b\u52a1)\u5728RAC\u4e2d\u66f4\u900f\u660e\u3002\u57fa\u672c\u4e0a\uff0c
\n\u4e00\u4e2a\u96c6\u7fa4\u8303\u56f4\u5168\u5c40\u6027\u4e8b\u52a1\u662f\u4e00\u4e2a\u5728RAC\u4e2d\u7684\u6bcf\u4e2a\u8282\u70b9\u5747\u6709\u4e00\u4e2a\u672c\u5730\u4e8b\u52a1\u7684\u5206\u5e03\u5f0f\u4e8b\u52a1\uff0c\u5f53_clusterwide_global_transactions=true(\u9ed8\u8ba4)\u65f6\uff0c
\nORACLE\u4f1a\u628a\u8fd9\u4e9b\u672c\u5730\u4e8b\u52a1\u5f53\u505a\u4e00\u4e2a\u4e8b\u52a1\u5bf9\u5f85\uff0c\u5f53_clusterwide_global_transactions=false\u65f6\uff0cORACLE\u4f1a\u5c06\u8fd9\u4e9b\u672c\u5730\u4e8b\u52a1\u5f53\u505a\u5355\u72ec\u7684\u4e8b\u52a1
\n\u901a\u8fc7\u591a\u9636\u6bb5\u63d0\u4ea4\u534f\u8c03\u5904\u7406\u3002\u8bbe\u7f6e\u8be5\u53c2\u6570\u4e3afalse\u4e0d\u4f1a\u6709\u4efb\u4f55\u6027\u80fd\u5f71\u54cd\u3002<\/p>\n
\u8bbe\u7f6e\u8be5\u53c2\u6570\u503c\u4e3aFALSE\u53ef\u4ee5\u89e3\u51b3\u5982\u4e0b\u7b49\u95ee\u9898\uff1a
\nBug 13605839 ORA-600 [ktbsdp1] ORA-600 [kghfrempty:ds] ORA-600 [kdBlkCheckError]. Corruption in Rollback with Clusterwide Global Transactions in RAC
\nORA-00600: [kjuscl:!free]<\/p>\n
\n
XA\u91ca\u4e49\uff1a
\nXA\u662fX\/Open DTP\u7ec4\u7ec7(X\/Open DTP group)\u5b9a\u4e49\u7684\u4e24\u9636\u6bb5\u63d0\u4ea4\u534f\u8bae\uff0cXA\u88ab\u8bb8\u591a\u6570\u636e\u5e93(\u5982Oracle\u548cDB2)\u548c\u4e2d\u95f4\u4ef6\u7b49\u5de5\u5177(\u5982CICS \u548c Tuxedo).\u672c\u5730\u652f\u6301 \u3002
\nX\/Open DTP\u6a21\u578b(1994)\u5305\u62ec\u5e94\u7528\u7a0b\u5e8f(AP)\u3001\u4e8b\u52a1\u7ba1\u7406\u5668(TM)\u3001\u8d44\u6e90\u7ba1\u7406\u5668(RM)\u3001\u901a\u4fe1\u8d44\u6e90\u7ba1\u7406\u5668(CRM)\u56db\u90e8\u5206\u3002\u5728\u8fd9\u4e2a\u6a21\u578b\u4e2d\uff0c
\n\u901a\u5e38\u4e8b\u52a1\u7ba1\u7406\u5668(TM)\u662f\u4ea4\u6613\u4e2d\u95f4\u4ef6\uff0c\u8d44\u6e90\u7ba1\u7406\u5668(RM)\u662f\u6570\u636e\u5e93\uff0c\u901a\u4fe1\u8d44\u6e90\u7ba1\u7406\u5668(CRM)\u662f\u6d88\u606f\u4e2d\u95f4\u4ef6\u3002
\n\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u67d0\u4e00\u6570\u636e\u5e93\u65e0\u6cd5\u77e5\u9053\u5176\u5b83\u6570\u636e\u5e93\u5728\u505a\u4ec0\u4e48\uff0c\u56e0\u6b64\uff0c\u5728\u4e00\u4e2aDTP\u73af\u5883\u4e2d\uff0c\u4ea4\u6613\u4e2d\u95f4\u4ef6\u662f\u5fc5\u9700\u7684\uff0c\u7531\u5b83\u901a\u77e5\u548c\u534f\u8c03\u76f8\u5173\u6570\u636e\u5e93\u7684\u63d0\u4ea4\u6216\u56de\u6eda\u3002
\n\u800c\u4e00\u4e2a\u6570\u636e\u5e93\u53ea\u5c06\u5176\u81ea\u5df1\u6240\u505a\u7684\u64cd\u4f5c(\u53ef\u6062\u590d)\u5f71\u5c04\u5230\u5168\u5c40\u4e8b\u52a1\u4e2d\u3002
\nXA\u5c31\u662fX\/Open DTP\u5b9a\u4e49\u7684\u4ea4\u6613\u4e2d\u95f4\u4ef6\u4e0e\u6570\u636e\u5e93\u4e4b\u95f4\u7684\u63a5\u53e3\u89c4\u8303(\u5373\u63a5\u53e3\u51fd\u6570)\uff0c\u4ea4\u6613\u4e2d\u95f4\u4ef6\u7528\u5b83\u6765\u901a\u77e5\u6570\u636e\u5e93\u4e8b\u52a1\u7684\u5f00\u59cb\u3001\u7ed3\u675f\u4ee5\u53ca\u63d0\u4ea4\u3001\u56de\u6eda\u7b49\u3002
\nXA\u63a5\u53e3\u51fd\u6570\u7531\u6570\u636e\u5e93\u5382\u5546\u63d0\u4f9b\u3002\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u4ea4\u6613\u4e2d\u95f4\u4ef6\u4e0e\u6570\u636e\u5e93\u901a\u8fc7XA\u63a5\u53e3\u89c4\u8303\uff0c\u4f7f\u7528\u4e24\u9636\u6bb5\u63d0\u4ea4\u6765\u5b8c\u6210\u4e00\u4e2a\u5168\u5c40\u4e8b\u52a1\u3002<\/p>\n
XA\u89c4\u8303\u7684\u57fa\u7840\u662f\u4e24\u9636\u6bb5\u63d0\u4ea4\u534f\u8bae\uff1a
\n\u5728\u7b2c\u4e00\u9636\u6bb5\uff0c\u4ea4\u6613\u4e2d\u95f4\u4ef6\u8bf7\u6c42\u6240\u6709\u76f8\u5173\u6570\u636e\u5e93\u51c6\u5907\u63d0\u4ea4(\u9884\u63d0\u4ea4)\u5404\u81ea\u7684\u4e8b\u52a1\u5206\u652f\uff0c\u4ee5\u786e\u8ba4\u662f\u5426\u6240\u6709\u76f8\u5173\u6570\u636e\u5e93\u90fd\u53ef\u4ee5\u63d0\u4ea4\u5404\u81ea\u7684\u4e8b\u52a1\u5206\u652f\u3002
\n\u5f53\u67d0\u4e00\u6570\u636e\u5e93\u6536\u5230\u9884\u63d0\u4ea4\u540e\uff0c\u5982\u679c\u53ef\u4ee5\u63d0\u4ea4\u5c5e\u4e8e\u81ea\u5df1\u7684\u4e8b\u52a1\u5206\u652f\uff0c\u5219\u5c06\u81ea\u5df1\u5728\u8be5\u4e8b\u52a1\u5206\u652f\u4e2d\u6240\u505a\u7684\u64cd\u4f5c\u56fa\u5b9a\u8bb0\u5f55\u4e0b\u6765\uff0c\u5e76\u7ed9\u4ea4\u6613\u4e2d\u95f4\u4ef6\u4e00\u4e2a\u540c\u610f\u63d0\u4ea4\u7684\u5e94\u7b54\uff0c
\n\u6b64\u65f6\u6570\u636e\u5e93\u5c06\u4e0d\u80fd\u518d\u5728\u8be5\u4e8b\u52a1\u5206\u652f\u4e2d\u52a0\u5165\u4efb\u4f55\u64cd\u4f5c\uff0c\u4f46\u6b64\u65f6\u6570\u636e\u5e93\u5e76\u6ca1\u6709\u771f\u6b63\u63d0\u4ea4\u8be5\u4e8b\u52a1\uff0c\u6570\u636e\u5e93\u5bf9\u5171\u4eab\u8d44\u6e90\u7684\u64cd\u4f5c\u8fd8\u672a\u91ca\u653e(\u5904\u4e8e\u9501\u5b9a\u72b6\u6001)\u3002
\n\u5982\u679c\u7531\u4e8e\u67d0\u79cd\u539f\u56e0\u6570\u636e\u5e93\u65e0\u6cd5\u63d0\u4ea4\u5c5e\u4e8e\u81ea\u5df1\u7684\u4e8b\u52a1\u5206\u652f\uff0c\u5b83\u5c06\u56de\u6eda\u81ea\u5df1\u7684\u6240\u6709\u64cd\u4f5c\uff0c\u91ca\u653e\u5bf9\u5171\u4eab\u8d44\u6e90\u4e0a\u7684\u9501\uff0c\u5e76\u8fd4\u56de\u7ed9\u4ea4\u6613\u4e2d\u95f4\u4ef6\u5931\u8d25\u5e94\u7b54\u3002<\/p>\n
\u5728\u7b2c\u4e8c\u9636\u6bb5\uff0c\u4ea4\u6613\u4e2d\u95f4\u4ef6\u5ba1\u67e5\u6240\u6709\u6570\u636e\u5e93\u8fd4\u56de\u7684\u9884\u63d0\u4ea4\u7ed3\u679c\uff0c\u5982\u6240\u6709\u6570\u636e\u5e93\u90fd\u53ef\u4ee5\u63d0\u4ea4\uff0c\u4ea4\u6613\u4e2d\u95f4\u4ef6\u5c06\u8981\u6c42\u6240\u6709\u6570\u636e\u5e93\u505a\u6b63\u5f0f\u63d0\u4ea4\uff0c\u8fd9\u6837\u8be5\u5168\u5c40\u4e8b\u52a1\u88ab\u63d0\u4ea4\u3002
\n\u800c\u5982\u679c\u6709\u4efb\u4e00\u6570\u636e\u5e93\u9884\u63d0\u4ea4\u8fd4\u56de\u5931\u8d25\uff0c\u4ea4\u6613\u4e2d\u95f4\u4ef6\u5c06\u8981\u6c42\u6240\u6709\u5176\u5b83\u6570\u636e\u5e93\u56de\u6eda\u5176\u64cd\u4f5c\uff0c\u8fd9\u6837\u8be5\u5168\u5c40\u4e8b\u52a1\u88ab\u56de\u6eda\u3002<\/p>\n
\n
\u4e09\u3001_gc_defer_time<\/h2>\n
how long to defer pings for hot buffers in milliseconds
\n\u7528\u4e8e\u786e\u5b9a\u670d\u52a1\u5668\u5728\u5c06\u9891\u7e41\u4f7f\u7528\u7684\u5757\u5199\u5165\u78c1\u76d8\u4e4b\u524d\u8981\u7b49\u5f85\u7684\u65f6\u95f4\u957f\u5ea6 (\u4ee5 1\/1000 \u79d2\u4e3a\u5355\u4f4d)\uff0c\u4ee5\u51cf\u5c11\u8fdb\u7a0b\u5bf9\u70ed\u5757\u7684\u4e89\u7528\uff0c\u9ed8\u8ba4\u4e3a0\u3002<\/p>\n
\u56db\u3001_resource_manager_always_off\u3001_resource_manager_always_on<\/h2>\n
\u9ed8\u8ba4FALSE\u3001TRUE\uff0c\u5176\u9ed8\u8ba4\u662f\u542f\u7528\u8d44\u6e90\u8c03\u5ea6\u3002
\n\u5c06_resource_manager_always_off = true\u3001_resource_manager_always_on = false\u5373\u4e3a\u7981\u7528Oracle\u7f3a\u7701\u542f\u7528\u7684\u8d44\u6e90\u8c03\u5ea6,
\n\u907f\u514d\u53ef\u80fd\u4ea7\u751fresmgr:cpu quantum\u7b49\u5f85\u4e8b\u4ef6\u60c5\u51b5\u3002\u7531\u4e8e\u572811g\u4e2d\u8d44\u6e90\u8c03\u5ea6\u5b58\u5728\u8bf8\u591aBUG\uff0c\u6545\u9009\u62e9\u5173\u95ed\u3002
\n\u90e8\u5206\u5b98\u6863\uff1a
\n'resmgr:cpu quantum' wait event in 11g when VKRM process is not present (\u6587\u6863 ID 1603996.1)
\nAwr Reports hang, MMon slaves are waiting on resmgr:cpu quantum (\u6587\u6863 ID 1530676.1)<\/p>\n
\u4e94\u3001_serial_direct_read<\/h2>\n
\u5728Oracle 11g\u4e2d\uff0c\u5168\u8868\u626b\u63cf\u53ef\u80fd\u4f7f\u7528direct path read\u65b9\u5f0f(\u65e0\u8bba\u8868\u5927\u5c0f)\uff0c\u800c\u4e0d\u662fbuffer cache\uff0c\u8fd9\u6837\u7684\u5168\u8868\u626b\u63cf\u5c31\u662f\u7269\u7406\u8bfb\u4e86\u3002
\n_serial_direct_read = false \u7981\u7528direct path read
\n_serial_direct_read = true \u542f\u7528direct path read
\n_serial_direct_read = never \u53ef\u4ee5\u663e\u8457\u5730\u51cf\u5c11direct path read<\/p>\n
\u516d\u3001_cleanup_rollback_entries<\/h2>\n
\u8be5\u53c2\u6570\u6307\u5b9a\u56de\u6eda\u65f6\u6bcf\u6b21\u56de\u6eda\u7684ENTRIES\u4e2a\u6570\uff0c\u9ed8\u8ba4\u4e3a100\uff0c\u8bbe\u7f6e\u6210400\u52a0\u5feb\u56de\u6eda\u901f\u5ea6\u3002<\/p>\n
\u4e03\u3001_optimizer_use_feedback<\/h2>\n
11.2\u5f00\u59cbOracle\u6709\u4e86\u4e00\u79cd\u65b0\u7684\u7279\u6027Cardinality Feedback\uff0cCardinality Feedback\u662f\u4e00\u4e2a\u4f18\u5316\u5668\u81ea\u52a8\u4f18\u5316\u7684\u8fc7\u7a0b\uff0c
\n\u4f18\u5316\u5668\u4f1a\u81ea\u52a8\u4fee\u6b63\u91cd\u590d\u6267\u884c\u7684\u67e5\u8be2\u7684\u6267\u884c\u8ba1\u5212\u3002\u5bf9\u4e8e\u4e00\u4e9b\u590d\u6742\u7684\u67e5\u8be2\uff0c\u6bd4\u5982\u591a\u5b57\u6bb5\u6761\u4ef6\uff0c\u5b57\u7b26\u4e32\u8303\u56f4\u6bd4\u8f83\uff0c\u6570\u636eSKEW\u7b49\u7b49\uff0c
\n\u4ee5\u53ca\u7f3a\u4e4f\u7edf\u8ba1\u4fe1\u606f\uff0c\u4f18\u5316\u5668\u53ef\u80fd\u4e0d\u80fd\u591f\u4ea7\u751f\u4e00\u4e2a\u5b8c\u5168\u51c6\u786e\u7684\u57fa\u6570\u4f30\u8ba1, \u5982\u4e22\u5931\u6216\u7edf\u8ba1\u6570\u636e\u4e0d\u51c6\u786e\uff0c\u6216\u590d\u6742\u7684\u8c13\u8bcd\u7684\u57fa\u6570\u4f30\u8ba1\u3002
\ncardinality feedback \u5c31\u662f\u57fa\u4e8e\u8fd9\u4e00\u539f\u56e0\u800c\u4ea7\u751f\u7684\u3002
\n_optimizer_use_feedback\u53c2\u6570\u9ed8\u8ba4\u662fTRUE\uff0c\u5373\u5f00\u542fCardinality Feedback\uff0cFALSE\u4e3a\u5173\u95edCardinality feedback\u3002
\n\u7531\u4e8e\u572811GR2\u4e2dCardinality feedback\u751f\u6548\u5b58\u5728\u5f88\u591a\u9650\u5236\u4e14BUG\u8f83\u591a\uff0c\u6545\u6ca1\u5fc5\u8981\u542f\u7528\u3002<\/p>\n
\u516b\u3001_dbms_sql_security_level<\/h2>\n
\u8be5\u53c2\u6570\u67090,1,2\u51713\u4e2a\u503c(\u9ed8\u8ba4\u503c\u4e3a1)\uff0c0\u5173\u95eddbms_sql\u5305\u7684\u5b89\u5168\u68c0\u67e5\uff0c\u6253\u5f00\u5149\u6807\u7ea7\u522b\u4e3a1\u7684\u8981\u6c42\u6267\u884c\/\u7ed1\u5b9a\u548c\u89e3\u6790\u7528\u6237id\u662f\u76f8\u540c\u7684\u3002
\n2\u7ea7\u662f\u66f4\u4e25\u683c\u7684\u548c\u9700\u8981id\u548c\u89d2\u8272\u662f\u76f8\u540c\u7684\u6240\u6709\u64cd\u4f5c,\u5982\u7ed1\u5b9a\u3001\u63cf\u8ff0\u3001\u6267\u884c\u3001\u63d0\u53d6\u7b49\u3002\u5982\u679c\u51fa\u73b0ORA-29471\u7684\u9519\u8bef\u4e4b\u540e\uff0c\u53ea\u6709\u65ad\u5f00\u5f53\u524d\u8fd9\u4e2asession\uff0c
\n\u7136\u540e\u91cd\u65b0\u8fde\u63a5\u6570\u636e\u5e93\u624d\u53ef\u4ee5\u6b63\u5e38\u8c03\u7528DBMS_SQL\u5305\u3002\u82e5\u662f\u60f3\u5c01\u95edsecurity check\uff0c\u987b\u8981\u5c06\u4e00\u4e2a\u9690\u542b\u53c2\u6570_dbms_sql_security_level\u8bbe\u7f6e\u62100\uff0c
\n\u91cd\u542f\u6570\u636e\u5e93\u751f\u6548\u3002<\/p>\n
\u4e5d\u3001_bloom_pruning_enabled\u3001_bloom_filter_enabled<\/h2>\n
\u5e03\u9686\u8fc7\u6ee4\u5668(Bloom Filter)\u7b97\u6cd5\u5728Oracle Database 10gR2\u4e2d\u88ab\u5f15\u5165\u5230Oracle\u6570\u636e\u5e93\u4e2d,
\n\u5e03\u9686\u8fc7\u6ee4\u80fd\u591f\u4f7f\u7528\u6781\u4f4e\u7684\u5b58\u50a8\u7a7a\u95f4\uff0c\u5b58\u50a8\u6d77\u91cf\u6570\u636e\u7684\u6620\u5c04\uff0c\u4ece\u800c\u53ef\u4ee5\u63d0\u4f9b\u5feb\u901f\u7684\u8fc7\u6ee4\u673a\u5236\u3002
\n11R2\u4f1a\u9047\u5230\u4e00\u4e2aBLOOM\u8fc7\u6ee4\u5668\u5bfc\u81f4\u7684BUG 9124206\u548cBUG 8361126\uff0c\u51fa\u73b0ORA-00060 ORA-10387\u9519\u8bef\uff0c
\n_bloom_pruning_enabled\u3001_bloom_filter_enabled\u5747\u8bbe\u4e3aFALSE\u907f\u514dBUG
\n\u8be6\u7ec6\u9519\u8bef\u5982\u4e0b\uff1a
\nORA-00060: deadlock detected while waiting for resource
\nORA-10387: parallel query server interrupt (normal)<\/p>\n
\u5341\u3001_gc_policy_time<\/h2>\n
\u53c2\u6570\u9ed8\u8ba4\u503c\u662f10\uff0c0\u662f\u5173\u95edDRM\u7279\u6027,DRM\u572811G\u4e2d\u4e0d\u7a33\u5b9a\uff0c\u5b58\u5728\u4f17\u591aBUG<\/p>\n
\u5341\u4e00\u3001_gc_read_mostly_locking<\/h2>\n
\u53c2\u6570\u9ed8\u8ba4\u662fTRUE\uff0c\u5373\u5f00\u542fread mostly locking\uff0c
\nFALSE\u5373\u4e3a\u7981\u7528read mostly\u7684\u7279\u6027\uff0cread mostly locking\u673a\u5236\uff0c\u80fd\u51cf\u5c11\u8bfb\u8bbf\u95ee\u7684\u6d88\u606f\u4f20\u9012\u548cCPU\u6d88\u8017\uff0c
\n\u4f46\u662f\u5199\u8bbf\u95ee\u5c31\u4f1a\u6bd4\u4f20\u7edf\u7684cache fusion locking\u673a\u5236\u6d88\u8017\u66f4\u591a\u7684IO\u3002read-mostly\u7684\u7279\u6027\u662f\u7ed9\u90a3\u4e9b\u8bfb\u5f88\u591a\uff0c
\n\u5199\u5f88\u5c11\u7684\u7cfb\u7edf\u6765\u542f\u7528\u6bd4\u8f83\u5408\u9002\u3002<\/p>\n
\u5341\u4e8c\u3001_gc_undo_affinity<\/h2>\n
\u53c2\u6570\u9ed8\u8ba4\u662fTRUE\uff0c\u8bbe\u7f6e\u4e3aFALSE\u7528\u4e8e\u5173\u95edDRM\u3002<\/p>\n
\u5341\u4e09\u3001_smu_debug_mode<\/h2>\n
\u9ed8\u8ba4\u4e3a0\uff0c\u4f1a\u6709\u90e8\u5206\u6027\u80fd\u6545\u969c\u53caBUG\u9700\u8981\u8bbe\u7f6e"_smu_debug_mode" = 134217728\u6765\u907f\u514d\uff0c
\n\u53e6\u901a\u8fc7\u8bbe\u7f6e_smu_debug_mode\u503c\u53ef\u4ee5\u5f88\u597d\u7684\u5b9e\u73b0\u5728undo\u81ea\u52a8\u7ba1\u7406\u6a21\u5f0f\u4e0b,\u6307\u5b9a\u4e8b\u52a1\u5728\u7279\u5b9a\u7684\u56de\u6eda\u6bb5,
\n\u5728\u67d0\u4e9b\u6781\u9650\u60c5\u51b5\u4e0b,\u53ef\u4ee5\u901a\u8fc7\u8be5\u64cd\u4f5c\u6765\u51cf\u5c11\u56de\u6eda\u6bb5\u4e89\u7528\u3002<\/p>\n
\u4f8b\u5982\uff1a
\n(1)\u5f53undo\u81ea\u52a8\u7ba1\u7406\u5206\u914dundo\u65f6\uff0c\u67d0\u4e9b\u60c5\u51b5\u4e0b\u6709\u4e9bundo\u6bb5\u5f88\u5f88\u5fd9\uff0c\u6709\u4e9b\u5219\u6bd4\u8f83\u7a7a\u95f2\uff0c\u8fd9\u4e2a\u65f6\u5019\u6211\u4eec\u9700\u5c06\u4e8b\u52a1\u4f7f\u7528\u7684\u56de\u6eda\u6bb5\u4ece\u5fd9\u7684\u56de\u6eda\u6bb5
\n\u4fee\u6539\u6210\u95f2\u7684\u56de\u6eda\u6bb5\u3002
\nselect segment_name,owner,tablespace_name from DBA_ROLLBACK_SEGS;           <<==\u67e5\u8be2\u56de\u6eda\u6bb5
\nset transaction use rollback segment "_SYSSMU8_517538920$";                 <<==\u6267\u884c\u56de\u6eda\u6bb5
\nselect XIDUSN from V$TRANSACTION;                                           <<==\u67e5\u8be2\u4e8b\u52a1\u56de\u6eda\u6bb5<\/p>\n
2)\u572811.2.0.2\u53ca\u4ee5\u540e\u7248\u672c\uff0c\u53ef\u80fd\u4f1a\u9047\u5230BUG 9272671\uff0c\u73b0\u8c61\u662f\u6bcf\u96945\u5206\u949f\u5728alert\u65e5\u5fd7\u4e2d\u4f1a\u8f93\u51fa
\nminact-scn: Slave 1 discarding message for out-of-order msg\uff0c\u8be5\u4fe1\u606f\u53ef\u4ee5\u5ffd\u7565\uff0c
\n\u4ea6\u53ef\u8bbe\u7f6e"_smu_debug_mode" = 134217728\u6765\u907f\u514d\u8be5\u4fe1\u606f\u8f93\u51fa\u503calert\u65e5\u5fd7\u3002<\/p>\n
3)\u5f53\u4e00\u4e2a\u5927\u4e8b\u52a1\u88abkill\u540e\uff0cSMON\u8fdb\u884c\u4e8b\u52a1\u56de\u6eda\u65f6\u4f1a\u88abMMON\u8fdb\u7a0b\u5835\u585e<\/p>\n
select usn, state, undoblockstotal "Total", undoblocksdone "Done", undoblockstotal-undoblocksdone "ToDo",\ndecode(cputime,0,'unknown',sysdate+(((undoblockstotal-undoblocksdone) \/ (undoblocksdone \/ cputime)) \/ 86400)) "Estimated time to complete"\nfrom v$fast_start_transactions;\n\n\u89e3\u51b3\u65b9\u6cd5\uff1a\n\u8bbe\u7f6e\u53c2\u6570\n```sql\nalter system set \"_smu_debug_mode\"=134217728;<\/code><\/pre>\n
kill MMON\u8fdb\u7a0b(\u6ce8\uff1akill MMOM\u8fdb\u7a0b\u4e0d\u4f1a\u7ec8\u6b62\u5b9e\u4f8b\uff0cAWR\u4e3b\u8981\u7684\u8fdb\u7a0b\uff0ckill\u4e4b\u540e\u4e00\u4e2a\u65b0\u7684MMON\u8fdb\u7a0b\u4f1a\u81ea\u52a8\u4f7f\u7528_smu_debug_mode=134217728\u542f\u52a8)
\nkill -9<\/p>\n
\u5b98\u6863\uff1a
\nMinact-Scn Master-Status: Grec-Scn Messages In Trace File (\u6587\u6863 ID 1361567.1)
\nSMON Is Waiting On Latch High CPU Resource consumption MMON blocking SMON (\u6587\u6863 ID 1496453.1)<\/p>\n
\u5341\u56db\u3001_undo_autotune<\/h2>\n
\u9ed8\u8ba4TRUE\uff0c\u8bbe\u7f6eFALSE\u5373\u5173\u95edundo retention\u81ea\u52a8\u8c03\u6574\u3002
\n\u8be5\u53c2\u6570\u7528\u4e8e\u81ea\u52a8\u8c03\u6574undo retention\u65f6\u95f4\uff0c\u5bf9\u4e8e\u81ea\u52a8\u6269\u5c55(autoextend on)\u7684undo\u8868\u7a7a\u95f4\uff0c\u53c2\u6570undo_retention\u8bbe\u7f6e\u6210\u4e3aOracle\u81ea\u52a8
\n\u8c03\u8282undo retention\u7684\u6700\u4f4e\u9600\u503c\u3002\u5bf9\u4e8e\u975e\u81ea\u52a8\u6269\u5c55(autoextend off)\uff0c\u975eguarantee\u7684undo\u8868\u7a7a\u95f4\uff0cOracle\u4f1a\u6839\u636eundo\u8868\u7a7a\u95f4\u5927\u5c0f
\n\u548cv$undostat\u7684\u5386\u53f2\u4fe1\u606f(\u662f\u5426\u7edf\u8ba1undo\u4fe1\u606f\u662f\u7531\u9690\u542b\u53c2\u6570_collect_undo_stats\u51b3\u5b9a\u7684\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e3aTRUE)\u6700\u5927\u53ef\u80fd\u6027\u4fdd\u7559undo\u4fe1\u606f\u3002<\/p>\n
\u5341\u4e94\u3001deferred_segment_creation<\/h2>\n
\u6bb5\u5ef6\u8fdf\u521b\u5efa\uff0c\u9ed8\u8ba4\u662ftrue\uff0c\u4e5f\u5c31\u662f\u65b0\u5efa\u4e00\u4e2a\u8868\uff0c\u5e76\u4e14\u6ca1\u6709\u5411\u5176\u4e2d\u63d2\u5165\u6570\u636e\uff0c\u90a3\u4e48\u8fd9\u4e2a\u8868\u4e0d\u4f1a\u7acb\u5373\u5206\u914dextent\uff0c\u4e5f\u5c31\u662f\u4e0d\u5360\u6570\u636e\u7a7a\u95f4\uff0c
\n\u53ea\u6709\u5f53insert\u6570\u636e\u540e\u624d\u4f1a\u5206\u914d\u7a7a\u95f4\uff0c\u8fd9\u4f1a\u5bfc\u81f4\u5728exp\u65f6\uff0c\u6ca1\u6709segment\u7684\u5bf9\u8c61\u4e0d\u4f1a\u5bfc\u51fa\u3002\u8bbe\u7f6e\u6210false\u5373\u7981\u7528\u6bb5\u5ef6\u8fdf\u521b\u5efa\u3002<\/p>\n
\u5341\u516d\u3001Audit_trail<\/h2>\n
\u7528\u4e8e\u63a7\u5236\u6570\u636e\u5e93\u5ba1\u8ba1\uff0c\u9ed8\u8ba4\u662fDB\uff0c\u8bbe\u7f6e\u6210none\u5373\u5173\u95ed\u5ba1\u8ba1\u3002<\/p>\n
\u5341\u4e03\u3001_optimizer_extended_cursor_sharing_rel\u3001_optimizer_extended_cursor_sharing\u3001_optimizer_adaptive_cursor_sharing<\/h2>\n
\u81ea\u9002\u5e94\u6e38\u6807\u5171\u4eab(Adaptive Cursor Sharing\uff1a ACS)<\/p>\n
alter system set \"_optimizer_extended_cursor_sharing_rel\"=none;\nalter system set \"_optimizer_extended_cursor_sharing\"=none;\nalter system set \"_optimizer_adaptive_cursor_sharing\"=false;<\/code><\/pre>\n
\u5373\u4e3a\u5173\u95edACS\uff0c\u907f\u514d\u4f17\u591aBug\uff0c\u4f8b\u5982Bug 11657468\uff0cBug 12333007\u7b49\u3002<\/p>\n
\u5b98\u6863\uff1a
\nBug 11657468 - Excessive mutex waits with adaptive cursor sharing (\u6587\u6863 ID 11657468.8)
\nBug 12333007 - Dump on kkocscopycolstats (\u6587\u6863 ID 12333007.8)<\/p>\n
\u5341\u516b\u3001event='28401 trace name context forever,level 1'<\/h2>\n
\u572810.2.0.5\u53ca\u4ee5\u540e\u7248\u672c\uff0c\u4f7f\u7528\u9519\u8bef\u5bc6\u7801\u767b\u9646\u5c1d\u8bd5\u4f1a\u5bfc\u81f4\u5f88\u9ad8\u7684Library Cache Locks\u6216row cache lock,
\n\u53ef\u4ee5\u8bbe\u7f6e\u8be5event\u6765\u907f\u514d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
ORACLE 11GR2\u7ecf\u5e38\u4fee\u6539\u7684\u9690\u542b\u53c2\u6570 alt<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-1453","post","type-post","status-publish","format-standard","hentry","category-oracle-11g"],"_links":{"self":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts\/1453","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1453"}],"version-history":[{"count":2,"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts\/1453\/revisions"}],"predecessor-version":[{"id":1455,"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts\/1453\/revisions\/1455"}],"wp:attachment":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1453"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1453"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1453"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}