在告警日志中发现了ORA-600(5351)错误，同时出现大量的There are 3 memory allocation errors for object-level stat错误。

详细的错误信息为：

Tue Jun 22 12:00:09 2010
Thread 1 advanced to log sequence 1522
Current log# 3 seq# 1522 mem# 0: /dev/rredo03
There are 6 memory allocation errors for object-level stat
in the last 15 minutes
There are 4 memory allocation errors for object-level stat
in the last 15 minutes
There are 3 memory allocation errors for object-level stat
in the last 15 minutes
There are 26 memory allocation errors for object-level stat
in the last 15 minutes
There are 9 memory allocation errors for object-level stat
in the last 15 minutes
There are 3 memory allocation errors for object-level stat
in the last 15 minutes
There are 2 memory allocation errors for object-level stat
in the last 15 minutes
There are 3 memory allocation errors for object-level stat
in the last 15 minutes
There are 3 memory allocation errors for object-level stat
in the last 15 minutes
Tue Jun 22 16:14:21 2010
Errors in file /oracle/admin/ruledb/udump/ruledb_ora_233726.trc:
ORA-00600: internal error code, arguments: [5351], [4365070], [57664], [], [], [], [], []
Tue Jun 22 16:14:44 2010
Doing block recovery for file 201 block 170765
No block recovery was needed
There are 658 memory allocation errors for object-level stat
in the last 15 minutes
There are 362 memory allocation errors for object-level stat
in the last 15 minutes
There are 16 memory allocation errors for object-level stat
in the last 15 minutes
There are 4 memory allocation errors for object-level stat
in the last 15 minutes
Tue Jun 22 17:43:01 2010
ALTER SYSTEM SET db_cache_size='2100M' SCOPE=BOTH;
Tue Jun 22 17:43:17 2010
ALTER SYSTEM SET shared_pool_size='712M' SCOPE=BOTH;

在MOS中查询了一下ORA-600(5351)，只差到一篇文章，基本上和当前的问题没有什么关系。不过除了这个明显的ORA-600错误外，大量的memory allocation errors for object-level错误信息也值得关注，查询发现问题和数据库共享池使用有关，如果频繁出现这个错误，最终可能导致ORA-4031错误。

Oracle在文档Memory Allocation Errors For Object-Level Stat Appearing in the Alert Log File [ID 757895.1]中描述了这个问题，而给出的解决方法是增大共享池或者设置隐含参数_OBJECT_STATISTICS=FALSE。

当前的数据库shared_pool的设置是500M左右，调整到712M后，无论是memory allocation errors还是ORA-600(5351)错误，都没有再重现。