Re: [PERFORM] : Column Performance in a query

2011-10-04 Thread Ondrej Ivanič
Hi, On 4 October 2011 21:25, Venkat Balaji wrote: > I got hold of two catalog tables "pg_stats" and "pg_class". > Column "avg_width" and "distinct" in pg_stats gets me lot of sensible > information regarding, column values and size of the column. > Can someone help me know when the values in thes

[PERFORM] : Column Performance in a query

2011-10-04 Thread Venkat Balaji
Hello Everyone, Generally when it comes to query performance, I check how the vacuuming and statistics collection is performed on Tables and Indexes hit by the query. Apart from the above i check the code logic ( for any bad joins ) and column statistics as well. I got hold of two catalog tables