Re: Select max(primary_key) taking a long time

From: Francisco Reyes <lists(at)stringsutils(dot)com>
To: Merlin Moncure <mmoncure(at)gmail(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL general <pgsql-general(at)postgresql(dot)org>
Subject: Re: Select max(primary_key) taking a long time
Date: 2010-05-22 23:22:55
Message-ID: cone.1274570575.501300.30938.1000@shelca
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Merlin Moncure writes:

> do a big delete recently? any other open transactions?

Some inserts were taking place. Roughly 2 to 5 million rows inside
transactions. We were doing some ETL and each batch represented a file we
were loading. We need to have the entire file or roll back so each file is
done within a transaction.

> the remedy for the former is to simply eat it (one time penalty) or
> rebuild the table. for the latter you simply have to resolve the
> other transaction.

I think it is related to the inserts... after they were done everything was
back to normal.

> how big is your table according to pg_relation_size()?

\dt+ is easier. :-)
116GB

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