Hi Steve, Thanks for your reply. We are now running 9.0.13. Before it was 9.0.7. How can I find out if we are running into this issue: "ie if statistics are no longer being updated because analyze can't get the exclusive lock for truncation"?
I will dig into our logs to see for the query times. Thanks, Anne -----Original Message----- From: Steve Singer [mailto:st...@ssinger.info] Sent: Monday, April 22, 2013 12:59 PM To: Anne Rosset Cc: email@example.com Subject: Re: [HACKERS] Performance with the new security release? On 13-04-22 01:38 PM, Anne Rosset wrote: > Hi, > We are seeing some overall performance degradation in our application > since we installed the security release. Other commits were also > done at the same time in the application so we don't know yet if the > degradation has any relationship with the security release. > > While we are digging into this, I would like to know if it is possible > that the release has some impact on performance. After reading this > "It was created as a side effect of a refactoring effort to make > establishing new connections to a PostgreSQL server faster, and the > associated code more maintainable.", I am thinking it is quite possible. > > Please let me know. Thanks, Exactly which version of PostgreSQL are you running? (we released security update releases for multiple PG versions). Also which version were you running before? There were some changes to analyze/vacuum in the previous set of minor releases that could cause performance issues in some cases (ie if statistics are no longer being updated because analyze can't get the exclusive lock for truncation). There might be other unintended performance related changes. Are all queries taking longer or only some? Can you find any sort of pattern that might help narrow the issue? Steve > Anne > > -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers