On Thu, Apr 17, 2014 at 1:39 PM, Andres Freund <and...@2ndquadrant.com> wrote: > On 2014-04-17 13:33:27 -0700, Peter Geoghegan wrote: >> Just over 99.6% of pages (leaving aside the meta page) in the big 10 >> GB pgbench_accounts_pkey index are leaf pages. > > That's a rather nice number. I knew it was big, but I'd have guessed > it'd be a percent lower.
Yes, it's usually past 99.5% for int4. It's really bad if it's as low as 96%, and I think that often points to what are arguably bad indexing choices, like indexing text columns that have long text strings. > Do you happen to have the same stat handy for a sensibly wide text or > numeric real world index? It'd be interesting to see what the worst case > there is. Yes, as it happens I do: http://www.postgresql.org/message-id/CAM3SWZTcXrdDZSpA11qZXiyo4_jtxwjaNdZpnY54yjzq7d64=a...@mail.gmail.com I was working of my Mouse Genome database, which is actually real-world data use by medical researchers, stored in a PostgreSQL database by those researchers and made available for the benefit of other medical researchers. -- Peter Geoghegan -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
