Re: Poor Performance on a table - Mailing list pgsql-performance

From Tom Lane
Subject Re: Poor Performance on a table
Date
Msg-id 29227.1102016219@sss.pgh.pa.us
Whole thread Raw
In response to Poor Performance on a table  (Pallav Kalva <pkalva@deg.cc>)
Responses Re: Poor Performance on a table
List pgsql-performance
Pallav Kalva <pkalva@deg.cc> writes:
>     I have a table in my production database which has 500k rows and
> from the pg_class it shows the number of "relpages" of
> around 750K for this table, the same table copied to a test database
> shows "relpages" as 35k. I run vacuumdb on the whole
> database (not on the table individually but the whole database) daily.

You're obviously suffering serious table bloat :-(.  Depending on how
heavy the update traffic on that table is, it might be that once-a-day
vacuum is simply not often enough.  Another likely problem is that you
need to increase the FSM settings (how big is your whole database?)

>   Is there any way to fix this problem ?

VACUUM FULL will fix the immediate problem.  You might well find CLUSTER
to be a faster alternative, though.

            regards, tom lane

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