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enq: HV - contention(Insert append partion table)

原创 Oracle 作者:q418441117 时间:2017-09-11 11:27:47 0 删除 编辑
Bug 8198783 - Create partitioned table as select in RAC shows significant HV enqueue wait time (文档 ID 8198783.8)

Description

CTAS can show significant HV enqueue wait time in RAC environments.
 
Rediscovery Notes:
 This fix introduces an enhancement for direct patch inserts / CTAS 
 on RAC Systems.
 
Note:
 This fix has caused problems as described in bug 10113090.



Bug 10113090 - ORA-600 [kxfxGetHVEnqMstr1] from a direct path insert/CTAS (文档 ID 10113090.8)

Description

An ORA-600 [kxfxGetHVEnqMstr1] may be encountered when executing 
a direct path insert / Create Table as Select (CTAS). Workaround Disable HVE (HV enqueue) remastering on participating load instances 
 via fix control. 
 eg: to disable it in a SQL session that attempts the direct load/CTAS 
     operation:
 alter session set "_fix_control"='8198783:OFF'
(HVE = HV enqueue is the direct loader high watermark enqueue) Note: This fix just changes the default "_fix_control" value for bug 8198783 to OFF .




解决办法:
1.
 alter session set "_fix_control"='8198783:OFF'
2.将datafile先resize


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