Poor Performance of Expdp Against a Particular Table (Doc ID 1613750.1)

Last updated on JANUARY 13, 2014

Applies to:

Oracle Database - Standard Edition - Version 11.2.0.3 and later
Information in this document applies to any platform.

Symptoms

Expdp is running very slowly against a particular table. A 10046 trace of the expdp shows that the waits are for 'db file sequential read' against the table itself, reading one block at a time, even though the internally defined parameter 'db_file_multiblock_read_count' is set to 128.

Conventional export is also slow.

An explain plan of expdp shows a full table scan is being performed.

Trying different options for the ACCESS_METHOD parameter does not make any difference.

Cause

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