Re: Minmax indexes

From: "Erik Rijkers" <er(at)xs4all(dot)nl>
To: "Alvaro Herrera" <alvherre(at)2ndquadrant(dot)com>
Cc: "Pg Hackers" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Minmax indexes
Date: 2013-09-25 22:34:43
Message-ID: b9c303579bf1a2bd8f080264865cc93b.squirrel@webmail.xs4all.nl
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-hackers

On Wed, September 25, 2013 22:34, Alvaro Herrera wrote:

> [minmax-5.patch]

I have the impression it's not quite working correctly.

The attached program returns different results for different values of enable_bitmapscan (consistently).

( Btw, I had to make the max_locks_per_transaction higher for even not-so-large tables -- is that expected? For a 100M row
table, max_locks_per_transaction=1024 was not enough; I set it to 2048. Might be worth some documentation, eventually. )

From eyeballing the results it looks like the minmax result (i.e. the result set with enable_bitmapscan = 1) yields only
the last part because the only 'last' rows seem to be present (see the values in column i in table tmm in the attached
program).

Thanks,

Erikjan Rijkers

Attachment Content-Type Size
test.sh application/x-shellscript 1.0 KB

In response to

Responses

Browse pgsql-hackers by date

  From Date Subject
Next Message Michael Paquier 2013-09-26 03:13:30 Re: Support for REINDEX CONCURRENTLY
Previous Message Alvaro Herrera 2013-09-25 22:20:17 Re: [PATCH] bitmap indexes