频繁出现ORA-07445和ORA-20000的错误

0727

我的数据库alert日志频繁出现下面的日志信息：

ORA-07445: exception encountered: core dump [kprball()+681] [SIGSEGV] [Address not mapped to object] [0x000000238] [] []
Tue Feb  6 13:05:08 2007
Trace dumping is performing id=[cdmp_20070206130508]
Tue Feb  6 17:22:07 2007

……

ORA-20000: Unable to analyze TABLE "SYS"."WRH$_ACTIVE_SESSION_HISTORY", insufficient privileges or does not exist