Very Slow Performance While Import For Particular Table
(Doc ID 305211.1)
Last updated on MARCH 12, 2019
Applies to:Oracle Database - Enterprise Edition - Version 126.96.36.199 to 188.8.131.52 [Release 9.2 to 11.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
Traditional import (imp) is slow on a particular table. Process state dump shows, imp is waiting for 'log file sync':
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:
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