oracle Library Cache Object loaded into SGA
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今天在测试数据库发现alert出现警告错误
Memory Notification: Library Cache Object loaded into SGAHeap size 2919K exceeds notification threshold (2048K)KGL object name :select service_name, uio_waits, uio_time, con_waits, con_time, adm_waits, adm_time, net_waits, net_time from (select stat1.service_name service_name, db_time, uio_waits, uio_time, con_waits, con_time, adm_waits, adm_time, net_waits, net_time from (select s1.service_name, sum(decode(s1.stat_name, 'DB time', s1.diff, 0)) db_time from (select e.service_name service_name, e.stat_name stat_name, Tue May 6 11:12:12 2014Memory Notification: Library Cache Object loaded into SGAHeap size 2757K exceeds notification threshold (2048K)Details in trace file /u01/app/oracle/admin/amidb/udump/amidb_or
后来在网上查了一下原来是在Oracle 10.2.0.1版本数据库中隐含参数_kgl_large_heap_warning_threshold默认值是2M,该参数控制加载到内存中对象的大小,当加载的对象大于2M时,就会在alert警告文件中进行提示。2M的默认大小相对太小,因此在10.2.0.1版本中可能很容易遇到这个报错信息。该参数默认值在10.2.0.2版本中进行了调整,调整到了50M。
alter system set "_kgl_large_heap_warning_threshold"=52428800 scope=spfile;System altered.
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