Commits on Mar 20, 2022

1. Increase database work_mem to 20MB …

   When troubleshooting production outages due to 100% CPU usage we use pgbadger to
   analyze and inspect the database logs. In the report of temp file usage there
   were some queries that produced temp files over 4MB in size, the default working
   memory setting for Postgres. The largest temp file we saw in our logs was just
   over 16MB so in this commit we increase the working memory to 20MB in an attempt
   to have all queries run in memory without spilling onto disk, which is
   expensive.
   
   The RDS parameter group value for `work_mem` is specified in KB, so we use a
   value of 20000.
   
   Our database free memory graph always remains stable at at over 2.3GB and we
   have fewer than ten simultaneous connections to the database at any given time
   so we do not expect this increase in working memory to cause a free memory
   issue.

   

   jwalgran committed Mar 20, 2022
   Configuration menu

   • View commit details
   • Copy full SHA for 8fad3dc
   • Browse repository at this point

   Copy the full SHA

   8fad3dc View commit details

   Browse the repository at this point in the history