Daily Archives: 2012 年 07 月 24 日

inactive transaction branch等待事件

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分析一份awr,发现不太熟悉的等待事件”inactive transaction branch”,awr相关信息如下



分析top 1 sql中的对象

SQL> select * from v$version;

BANNER
-----------------------------------------------------------------------------

Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
PL/SQL Release 11.2.0.2.0 - Production
CORE    11.2.0.2.0      Production
TNS for IBM/AIX RISC System/6000: Version 11.2.0.2.0 - Production
NLSRTL Version 11.2.0.2.0 - Production

SQL> select owner,object_type from dba_objects where object_name =upper('wCommonShortMsg');

OWNER                          OBJECT_TYPE
------------------------------ -------------------
PUBLIC                         SYNONYM
OFFONQUERY                     SYNONYM

SQL> COL DB_LINK FOR A12
SQL> select TABLE_OWNER,TABLE_NAME,DB_LINK from dba_SYNONYMS WHERE 
   2 SYNONYM_NAME=upper('wCommonShortMsg');

TABLE_OWNER                    TABLE_NAME                     DB_LINK
------------------------------ ------------------------------ ------------
                               WCOMMONSHORTMSG                CRMDB_LINK
                               WCOMMONSHORTMSG                DB_LINK_CRM

通过这里查询,可以确定引起dblink相关等待严重的是关于wCommonShortMsg同义词查询导致(使用dblink连接到其他库),结合数据库版本，大致可以确定inactive transaction branch等待和MOS中的bug 10413418相符