On Fri, Oct 18, 2013 at 9:12 PM, Tom Lane <t...@sss.pgh.pa.us> wrote:
> dinesh kumar <dineshkuma...@gmail.com> writes: > > When we create an index, i believe the postgres engine it self update > it's > > catalog about the index availability. > > ANALYZE normally collects statistics about the contents of table columns. > Thus, adding (or removing) an index does not create any reason to > re-ANALYZE. > > However ... if you have an index on an expression (not just a simple > column value), that cues ANALYZE to collect statistics about the values of > that expression. So re-analyzing is useful after creating such an index, > to give the planner a better idea of when to use that index. > > Thank you Tom. > Whether you used CREATE INDEX CONCURRENTLY or some other way of creating > the index doesn't matter at all. > > regards, tom lane > Regards, Dinesh manojadinesh.blogspot.com
