一套Linux上的10.2.0.4系统,日志中频繁出现ORA-00600[6711]内部错误:
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Wed Sep 1 21:24:30 2010 Errors in file /s01/10gdb/admin/YOUYUS/bdump/youyus_smon_5622.trc: ORA-00600: internal error code, arguments: [6711], [4256248], [1], [4256242], [0], [], [], [] Wed Sep 1 21:24:31 2010 Non-fatal internal error happenned while SMON was doing logging scn->time mapping.
MOS上有一个关于6711内部错误十分简单的Note,该文档声称出现6711错误极有可能是部分类型为簇(cluster)的数据字典表存在潜在的讹误,这个Note甚至没有告诉我们该错误argument参数的意义。
不过其实我们可以猜出来,因为是和corruption相关的错误,那么实际上可能关联的几个因素无非是obj#,file#,block#;4256248和4256242 两个数字像极了Data Block Address,把他们当做dba来看待,也就指向了1号数据文件的61938块和61944数据块,我们来看看这些块属于哪个对象:
SQL> set linesize 200; SQL> select segment_name, segment_type 2 from dba_extents 3 where relative_fno = 1 4 and (61938 between block_id and block_id + blocks or 5 61944 between block_id and block_id + blocks); SEGMENT_NAME SEGMENT_TYPE --------------------------------------------------------------------------------- ------------------ SMON_SCN_TO_TIME CLUSTER
不出意料是一个cluster,SMON_SCN_TO_TIME是SMON_SCN_TIME表的基簇,SMON_SCN_TIME表用以记录数据库中scn对应的时间戳。我们直接查看用以创建数据字典的sql.bsq文件,可以进一步了解他们的结构:
cat $ORACLE_HOME/rdbms/admin/sql.bsq|grep -A 24 "create cluster smon_scn_to_time" create cluster smon_scn_to_time ( thread number /* thread, compatibility */ ) / create index smon_scn_to_time_idx on cluster smon_scn_to_time / create table smon_scn_time ( thread number, /* thread, compatibility */ time_mp number, /* time this recent scn represents */ time_dp date, /* time as date, compatibility */ scn_wrp number, /* scn.wrp, compatibility */ scn_bas number, /* scn.bas, compatibility */ num_mappings number, tim_scn_map raw(1200), scn number default 0, /* scn */ orig_thread number default 0 /* for downgrade */ ) cluster smon_scn_to_time (thread) / create unique index smon_scn_time_tim_idx on smon_scn_time(time_mp) / create unique index smon_scn_time_scn_idx on smon_scn_time(scn) /
从以上脚本可以看到这个簇上存在多个索引,我们需要进一步validate验证所有这些对象:
SQL> analyze table SMON_SCN_TIME validate structure; Table analyzed. SQL>analyze table SMON_SCN_TIME validate structure cascade; Table analyzed. SQL> analyze cluster SMON_SCN_TO_TIME validate structure; Cluster analyzed. SQL> analyze cluster SMON_SCN_TO_TIME validate structure cascade; analyze cluster SMON_SCN_TO_TIME validate structure cascade * ERROR at line 1: ORA-01499: table/index cross reference failure - see trace file
到这里问题已经很清晰了,问题出在SMON_SCN_TO_TIME的索引smon_scn_to_time_idx身上,极有可能是该索引上出现了逻辑讹误。所幸有问题的仅仅是索引,找出问题所在后要解决就显得容易得多了:
SQL> alter index smon_scn_to_time_idx rebuild ; Index altered. /* 在索引出现讹误的情况下仅仅rebuild往往是无效的,在我们rebuild的同时告警日志中再次出现了ORA-00600[6711]错误 !!! */ /* 我们需要的彻底把有问题的索引drop掉,并再次创建!!! */ SQL> drop index smon_scn_to_time_idx ; Index dropped. SQL> create index smon_scn_to_time_idx on cluster smon_scn_to_time; Index created. /* 至此问题解决,告警日志中不再出现错误! * / /* That's great! * /
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