Обсуждение: CREATING INDEX on column having null values
Hi, I have a partitioned table(partitioned on date) .There are about 1 million insertions per day. There is a column called mess_id. This column is updated .But update query is taking huge time.When i checked , this column is not unique, and most of the time its having null . Say everyday out of 1 million only 20K rows are not null for this column ;.Insertions are happening very fast , but update is very slow. How to optimize my update query? Is it good to create index on that column .. i m worried about my insertions getting slow Rgrds Suhas -- View this message in context: http://postgresql.1045698.n5.nabble.com/CREATING-INDEX-on-column-having-null-values-tp5735127.html Sent from the PostgreSQL - performance mailing list archive at Nabble.com.
Hello Suhas,
You need to supply good information for an accurate answer. Please have a look at this link:
http://wiki.postgresql.org/wiki/Slow_Query_Questions
Kind regards,
Willem
You need to supply good information for an accurate answer. Please have a look at this link:
http://wiki.postgresql.org/wiki/Slow_Query_Questions
Kind regards,
Willem
> Date: Wed, 5 Dec 2012 00:10:10 -0800
> From: suhas.b@verse.in
> To: pgsql-performance@postgresql.org
> Subject: [PERFORM] CREATING INDEX on column having null values
>
> Hi,
>
>
> I have a partitioned table(partitioned on date) .There are about 1 million
> insertions per day. There is a column called mess_id. This column is updated
> .But update query is taking huge time.When i checked , this column is not
> unique, and most of the time its having null . Say everyday out of 1
> million only 20K rows are not null for this column ;.Insertions are
> happening very fast , but update is very slow.
>
> How to optimize my update query? Is it good to create index on that
> column .. i m worried about my insertions getting slow
>
> Rgrds
> Suhas
>
>
>
> --
> View this message in context: http://postgresql.1045698.n5.nabble.com/CREATING-INDEX-on-column-having-null-values-tp5735127.html
> Sent from the PostgreSQL - performance mailing list archive at Nabble.com.
>
>
> --
> Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org)
> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-performance
> From: suhas.b@verse.in
> To: pgsql-performance@postgresql.org
> Subject: [PERFORM] CREATING INDEX on column having null values
>
> Hi,
>
>
> I have a partitioned table(partitioned on date) .There are about 1 million
> insertions per day. There is a column called mess_id. This column is updated
> .But update query is taking huge time.When i checked , this column is not
> unique, and most of the time its having null . Say everyday out of 1
> million only 20K rows are not null for this column ;.Insertions are
> happening very fast , but update is very slow.
>
> How to optimize my update query? Is it good to create index on that
> column .. i m worried about my insertions getting slow
>
> Rgrds
> Suhas
>
>
>
> --
> View this message in context: http://postgresql.1045698.n5.nabble.com/CREATING-INDEX-on-column-having-null-values-tp5735127.html
> Sent from the PostgreSQL - performance mailing list archive at Nabble.com.
>
>
> --
> Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org)
> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-performance