silverlight 做的网站,山东网站建设设计公司,怎么制做网站,展览中心近期展会ORACLE 12c的数据库#xff0c;以多租户方式运行#xff0c;运行了一段时间#xff0c;还比较稳定#xff0c;分享一下相关参数修改。
1、一些参数
DEFERRED_SEGMENT_CREATION
默认是true#xff0c;建议设置为false
_DATAFILE_WRITE_ERRORS_CRASH_INSTANCE
默认是tr…ORACLE 12c的数据库以多租户方式运行运行了一段时间还比较稳定分享一下相关参数修改。
1、一些参数
DEFERRED_SEGMENT_CREATION
默认是true建议设置为false
_DATAFILE_WRITE_ERRORS_CRASH_INSTANCE
默认是true所有datafile的IO写error都会导致数据库crash。建议设置为false。12.2.0.1之后版本不用修改
JOB_QUEUE_PROCESSES
默认是1000建议设置为你真正需要的数字。如果你不知道建议设置为10。如
_OPTIMIZER_AGGR_GROUPBY_ELIM
默认是true可能会导致groupby类的结果集错误。建议设置为false。
SESSION_CACHED_CURSORS
默认值是50太小容易导致内存碎片建议设置为1000.
RAC环境设置ASM实例audit_sys_operations 参数设置为FALSE
RAC环境设置ASM实例PROCESSES参数2000
2、上线前打好补丁
请参考以下note查看Oracle相应的补丁上线前安装最新补丁
Assistant: Download Reference for Oracle Database/GI Update, Revision, PSU, SPU(CPU), Bundle Patches, Patchsets and Base Releases ( Doc ID 2118136.2 )
https://support.oracle.com/epmos/faces/DocumentDisplay?parentSrDetailTextsourceId3-17677673745id2118136.2
3、内存过大导致实例宕机SGA超过600G
The following workarounds are available until a permanent fix for base bug will be released:
1/ Increase sga_target by 10% and set _shared_io_pool_sizegranule_size so that system component can allocate 1 granule during startup instead of asking buffer cache.
-- You can determine your granule size with this SQL:
SQL select bytes from v$sgainfo where name like Granule Size;
-- and set _shared_io_pool_sizegranule_size by running:
SQL alter system set _shared_io_pool_size granule_size;
- or -
2/ Comment the following in parameter file:
dispatchers (PROTOCOLTCP) (SERVICEsidXDB) . sid should be replaced with the relevant ORACLE_SID value.
Refer more on 2250078.1.
