I checked the release notes till 8.1.17, but could not come across any such issue which leads to db performance degradation after doing heavy db operations. AutoVacuum is also enabled parallel.
-----Original Message-----
From: Grzegorz Jaśkiewicz [mailto:gryzman(at)gmail(dot)com]
Sent: Monday, June 08, 2009 9:59 PM
To: Preeti Khura
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: [GENERAL] Postgres's Performance degrades after heavy db operation
oh, and take the time to upgrade to newest 8.1.X as the matter of urgency!.