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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 to [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':

    application name: imp (TNS V1-V3), hash value=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:




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