monalee_dba wrote: > Eg. SELECT col1, col2, col3,....col10 FROM table1; > > For above query If I didn't mention ORDER BY clause, then I want to know > selected data will appear in which order by a query planner? > > Because I have huge size table, and when I applied ORDER BY col1, col2..in > query the > performance is soo bad that I can't offred. > What should I do ? Because my requirement is data with ordered column. A B-Tree index may help with that: http://www.postgresql.org/docs/current/static/indexes-ordering.html Consider a multicolumn index. Yours, Laurenz Albe -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
