High Waits on 'Db File Sequential Read' Due to Table Lookup Following Index Access
(Doc ID 875472.1)
Last updated on SEPTEMBER 01, 2023
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.
NOTE:
In the images and/or the document content below, the user information and data used represents fictitious data from the Oracle sample schema(s) or Public Documentation delivered with an Oracle database product.
Any similarity to actual persons, living or dead, is purely coincidental and not intended in any manner.
In the images and/or the document content below, the user information and data used represents fictitious data from the Oracle sample schema(s) or Public Documentation delivered with an Oracle database product.
Any similarity to actual persons, living or dead, is purely coincidental and not intended in any manner.
For Example:
Changes
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |