work-mem how do I identify the proper size - Mailing list pgsql-performance

From Campbell, Lance
Subject work-mem how do I identify the proper size
Date
Msg-id A3AC4FA47DC0B1458C3E5396E685E63302395C69@SAB-DC1.sab.uiuc.edu
Whole thread Raw
Responses Re: work-mem how do I identify the proper size  (Bill Moran <wmoran@collaborativefusion.com>)
List pgsql-performance

If I set work-mem at a particular amount of memory how do I answer the following questions:

 

1)       How many of my queries were able to run inside the memory I allocated for work-mem?

2)       How many of my queries had to run from disk because work-mem was not set high enough?

3)       If a query had to go to disk in order to be sorted or completed is there a way to identify how much memory it would have taken in order to run the query from memory?

 

Thanks for all of your help,

 

Lance Campbell

Project Manager/Software Architect

Web Services at Public Affairs

University of Illinois

217.333.0382

http://webservices.uiuc.edu

 

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