High Waits on 'Db File Sequential Read' Due to Table Lookup Following Index Access (Doc ID 875472.1)

Last updated on JULY 17, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 8.0.3.0 to 11.2.0.2 [Release 8.0.3 to 11.2]
Information in this document applies to any platform.

Symptoms

A query can wait on 'db file sequential read' for a long time even if the execution plan appears to be optimal. This usually happens when the result set of index scan is large.

For Example:

 

Cause

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