Re: UnUsed Tuple Space Huge

"Michael G. Martin" <michael@vpmonline.com> writes:
> VACUUM verbose symbol_Data;
> NOTICE:  --Relation symbol_data--
> NOTICE:  Pages 767990: Changed 0, Empty 0; Tup 21595176: Vac 0, Keep 0,
                 ^^^^^^
> UnUsed 16560877.
>     Total CPU 61.94s/6.94u sec elapsed 179.25 sec.

That seems to be a couple orders of magnitude above the default size of
the free space map (10000 pages IIRC).  How big is your database in
total?  You definitely need to increase MAX_FSM_PAGES in
postgresql.conf, but I can't tell how far on the basis of this one
datapoint.

You will probably want to do a VACUUM FULL to clean out some of the free
space and then see where you really stand on number of pages.

            regards, tom lane