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最近发表
- ORA-00600: internal error code, arguments: [16703], [1403], [4] 原因
- 最近遇到几起ORA-600 16703故障(tab$被清空),请引起重视
- ORA-600 2662快速恢复之Patch scn工具
- TNS-12518: TNS:listener could not hand off client connection
- ora.storage无法启动报ORA-12514故障处理
- 断电引起文件scn异常数据库恢复
- ORA-16188: LOG_ARCHIVE_CONFIG settings inconsistent with previously started instance
- .[hudsonL@cock.li].mkp勒索加密数据库完美恢复
- 模拟带库实现rman远程备份
- 又一例:ORA-600 kclchkblk_4和2662故障
- Oracle误删除数据文件恢复
- Oracle 19C 备库DML重定向—DML Redirection
- ORA-01595/ORA-600 4194处理
- 从ORA-00283 ORA-16433报错开始恢复
- 近期又遇到ORA-600 16703和ORA-702故障
- RECOVER_YOUR_DATA勒索恢复
- ORA-01033: ORACLE initialization or shutdown in progress 故障处理
- Oracle 19c/21c最新patch信息-202401
- 存储故障,强制拉库报ORA-600 kcbzib_kcrsds_1处理
- ORA-600 kcrf_resilver_log_1故障处理
标签归档:reliable message
reliable message等待
在一次给客户的rac poc测试中,发现大量reliable message等待,严重影响性能
数据库版本
11.2.0.4+最新psu(180116)
SYS@xffdb1>select * from v$version; BANNER -------------------------------------------------------------------------------- Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production PL/SQL Release 11.2.0.4.0 - Production CORE 11.2.0.4.0 Production TNS for Linux: Version 11.2.0.4.0 - Production NLSRTL Version 11.2.0.4.0 - Production Elapsed: 00:00:00.00 SYS@xffdb1>exit Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP, Data Mining and Real Application Testing options [oracle@xifenfei01 ~]$ opatch lspatches 26609929;OCW Patch Set Update : 11.2.0.4.170814 (26609929) 26925576;Database Patch Set Update : 11.2.0.4.180116 (26925576) OPatch succeeded.
查询发现大量reliable message等待
SYS@xffdb1>@event INST_ID USERNAME EVENT COUNT(*) ---------------- ------------------------------ -------------------------------------------------- ---------------- 1 SOE reliable message 16 1 SOE gc current request 4 1 SOE gc cr request 5 1 SOE db file sequential read 17 1 SYS db file scattered read 1 2 SOE library cache: mutex X 2 2 SOE latch: ges resource hash list 2 2 SOE gc current request 1 2 SOE gc cr request 4 2 SOE db file sequential read 12 2 db file parallel write 1 2 SOE SQL*Net message to client 1 12 rows selected.
进一步查询发现大量Result Cache: Channel
SYS@xffdb1>SELECT CHANNEL, 2 SUM(wait_count) sum_wait_count 3 FROM GV$CHANNEL_WAITS 4 GROUP BY CHANNEL 5 ORDER BY SUM(wait_count) DESC; CHANNEL SUM_WAIT_COUNT ---------------------------------------------------------------- ---------------- Result Cache: Channel 379367698 RBR channel 128968 kxfp control signal channel 115091 MMON remote action broadcast channel 4646 obj broadcast channel 395 LCK0 ksbxic channel 17 parameters to cluster db instances - broadcast channel 4 service operations - broadcast channel 3 kill job broadcast - broadcast channel 2
查看result_cache_max_size参数
SYS@xffdb1>show parameter result_cache_max_size; NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ result_cache_max_size big integer 335552K
调整result_cache_max_size参数
SYS@xffdb1>alter system set result_cache_max_size=0; System altered. SYS@xffdb1>show parameter result_cache_max_size; NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ result_cache_max_size big integer 0
重启数据库,再次测试,发现相关等待消失,系统也更加稳定
SYS@xffdb1>@event INST_ID USERNAME EVENT COUNT(*) ---------------- ------------------------------ -------------------------------------------------- ---------------- 1 SOE library cache: mutex X 1 1 SOE gc current request 3 1 DBSNMP gc cr request 1 1 SOE gc cr request 7 1 SOE db file sequential read 18 1 db file parallel write 1 2 SOE library cache: mutex X 2 2 SOE latch free 1 2 SOE gc current request 4 2 SOE gc cr request 4 2 SOE db file sequential read 12 2 db file parallel write 3 12 rows selected.
参考:Very High Waits for ‘reliable message’ After Upgrade to 11.2.0.4 When Using Result Cache (Doc ID 1951729.1)