Why is the query not using the index for sorting? - Mailing list pgsql-performance

From Jonathan Blitz
Subject Why is the query not using the index for sorting?
Date
Msg-id 6913EA33EE934FF3B17ADA8A87082D15@jblaptop
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Re: Why is the query not using the index for sorting?
Re: Why is the query not using the index for sorting?
List pgsql-performance
I have a table with a number of columns.
 
I perform
 
Select *
from table
order by a,b
 
There is an index on a,b which is clustered (as well as indexes on a and b alone).
I have issued the cluster and anyalze commands.
 
Nevertheless, PostgreSQL performs a Sequential Scan on the table and then performs a sort.
Am I missing something?
 
Jonathan Blitz

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