Very Slow Performance While Import For Particular Table
(Doc ID 305211.1)
Last updated on AUGUST 04, 2018
Applies to:
Oracle Database - Enterprise Edition - Version 9.2.0.1 to 11.2.0.2 [Release 9.2 to 11.2]Information in this document applies to any platform.
***Checked for relevance on 04-Jul-2014***
Symptoms
Traditional import (imp) is slow on a particular table. Process state dump shows, imp is waiting for 'log file sync':
application name: imp (TNS V1-V3), hash value=0
waiting for 'log file sync' blocking sess=0x0 seq=4338 wait_time=0
waiting for 'log file sync' blocking sess=0x0 seq=4338 wait_time=0
If you import with COMMIT=N, the import is quick.
From event 10046 you always see the waiting statement:
INSERT /*+NESTED_TABLE_SET_REFS+*/ INTO ...
Cause
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In this Document
| Symptoms |
| Cause |
| Solution |
| References |