Обсуждение: After Vacuum Analyse - Procedure performance not improved - Innner select is faster
After Vacuum Analyse - Procedure performance not improved - Innner select is faster
Hi All,
I have a procedure which contains only one Select statement. The procedure take more time than expected to complete, the select statement inside the procedure was taking about 2 minutes to complete.
After running a Vacuum Analyze on the underlying tables the select statement could complete within seconds. But the procedure was still taking long time.
I tried after recreating the procedure, the procedure is taking only a few seconds after recreation.
Why the procedure is not getting the performance advantage of Vacuum analyse?
Regards,
Anoo
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Re: After Vacuum Analyse - Procedure performance not improved - Innner select is faster
Anoo Sivadasan Pillai wrote: > Why the procedure is not getting the performance advantage of Vacuum > analyse? Plan caching by the function, probably. Try disconnecting the session and reconnecting to prove the hypothesis. If it is a recurring problem for you, you could put the SELECT under EXECUTE in the function. But most likely this is just a one-time problem. -- Alvaro Herrera http://www.CommandPrompt.com/ PostgreSQL Replication, Consulting, Custom Development, 24x7 support
Re: After Vacuum Analyse - Procedure performance notimproved - Innner select is faster
>> Why the procedure is not getting the performance advantage of Vacuum >> analyse? >Plan caching by the function, probably. Try disconnecting the session >and reconnecting to prove the hypothesis. >If it is a recurring problem for you, you could put the SELECT under >EXECUTE in the function. But most likely this is just a one-time >problem. Is there any way to clear the cached plan manually other than disconnecting (With the help of some commands/Configuration settings) ? Visit our Website at http://www.rmesi.co.in This message is confidential. You should not copy it or disclose its contents to anyone. You may use and apply the informationfor the intended purpose only. Internet communications are not secure; therefore, RMESI does not accept legalresponsibility for the contents of this message. Any views or opinions presented are those of the author only and notof RMESI. If this email has come to you in error, please delete it, along with any attachments. Please note that RMESImay intercept incoming and outgoing email communications. Freedom of Information Act 2000 This email and any attachments may contain confidential information belonging to RMESI. Where the email and any attachmentsdo contain information of a confidential nature, including without limitation information relating to trade secrets,special terms or prices these shall be deemed for the purpose of the Freedom of Information Act 2000 as informationprovided in confidence by RMESI and the disclosure of which would be prejudicial to RMESI's commercial interests. This email has been scanned for viruses by Trend ScanMail.
On Jan 9, 2008, at 12:00 AM, Anoo Sivadasan Pillai wrote: > >>> Why the procedure is not getting the performance advantage of Vacuum >>> analyse? > >> Plan caching by the function, probably. Try disconnecting the >> session >> and reconnecting to prove the hypothesis. > >> If it is a recurring problem for you, you could put the SELECT under >> EXECUTE in the function. But most likely this is just a one-time >> problem. > > Is there any way to clear the cached plan manually other than > disconnecting (With the help of some commands/Configuration > settings) ? Only as of 8.3. Erik Jones DBA | Emma® erik@myemma.com 800.595.4401 or 615.292.5888 615.292.0777 (fax) Emma helps organizations everywhere communicate & market in style. Visit us online at http://www.myemma.com