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What constitutes a transaction when reading BLOBs?

From: Irina Sourikova <irina(at)bnl(dot)gov>
To: pgsql-admin(at)postgresql(dot)org
Subject: What constitutes a transaction when reading BLOBs?
Date: 2008-10-14 15:26:48
Message-ID: 48F4BA38.8030900@bnl.gov (view raw or flat)
Thread:
Lists: pgsql-admin
Hi,

We have a read-only database with large BLOBs, and the field 
'xact_commit' of pg_stat_database is incremented by thousands every minute.
The number of concurrent connections is about 5-10.
What is considered a transaction in general and when BLOBs are involved 
and how does it affect the autovacuum?

Thank you,
Irina

-- 
Irina Sourikova
Brookhaven National Laboratory      phone: +1-631-344-3776
Physics Department, Bldg 510 C      fax:   +1-631-344-3253
Upton, NY 11973-5000                email: irina(at)bnl(dot)gov



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