On Tue, Oct 18, 2005 at 06:15:02PM -0400, Tom Lane wrote: > "Marc G. Fournier" <[EMAIL PROTECTED]> writes: > > do we maintain anything anywhere for this? mainly, some way of > > determining # of 'sorts to disk' vs 'sort in memory', to determine whether > > or not sort_mem is set to a good value? > > As of 8.1 you could turn on trace_sort to collect some data about this.
While trace_sort is good, it doesn't really help for monitoring. What I would find useful would be statistics along the lines of: How many sorts have occured? How many spilled to disk? What's the largest amount of memory used by an in-memory sort? What's the largest amount of memory used by an on-disk sort? -- Jim C. Nasby, Sr. Engineering Consultant [EMAIL PROTECTED] Pervasive Software http://pervasive.com work: 512-231-6117 vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461 ---------------------------(end of broadcast)--------------------------- TIP 5: don't forget to increase your free space map settings