SQL Performance (MOSC)

MOSC Banner

Why is my index not used?

in SQL Performance (MOSC)

Performance team frequently gets cases where indexes are not being used.  So the big question is why is an index not used when the table has indexes?

There are many reasons why an index is not used.  For one, the table may be small, and full table scan may be better plan.  Review our following note to go

down the list to check why an index may not be used:

Diagnosing Why a Query is Not Using an Index (Doc ID 67522.1)

Have any questions?  Please ask!

Howdy, Stranger!

Log In

To view full details, sign in to My Oracle Support Community.

Register

Don't have a My Oracle Support Community account? Click here to get started.

Category Leaderboard

Top contributors this month

Instructions for posting

×

1. Select a discussion category from the picklist.


2. Enter a title that clearly identifies the subject of your question.


3. In the body, insert detailed information, including Oracle product and version.


Please abide by the Oracle Community guidelines and refrain from posting any customer or personally identifiable information (PI/CI).


Cloud / Fusion customers - Our Cloud community has moved! Please go to Cloud Customer Connect .


New to My Oracle Support Community? Visit our Welcome Center

MOSC Help Center