Skip site navigation (1) Skip section navigation (2)

Re: VACUUM ANALYZE is faster than ANALYZE?

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Nicolas Barbier <nicolas(dot)barbier(at)gmail(dot)com>
Cc: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: VACUUM ANALYZE is faster than ANALYZE?
Date: 2012-02-22 13:33:07
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On Wed, Feb 22, 2012 at 8:13 AM, Nicolas Barbier
<nicolas(dot)barbier(at)gmail(dot)com> wrote:
> 2012/2/22 Robert Haas <robertmhaas(at)gmail(dot)com>:
>> On Tue, Feb 21, 2012 at 9:00 AM, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> wrote:
>>> I had to reply to query about usage VACUUM ANALYZE or ANALYZE. I
>>> expected so ANALYZE should be faster then VACUUM ANALYZE.
>>> But is not true. Why?
>> I'm pretty sure that VACUUM ANALYZE *will* be faster than ANALYZE in
>> general, because VACUUM has to scan the whole table, and ANALYZE only
>> a fixed-size subset of its pages.
> It sounds like you just said the opposite of what you wanted to say.

Yeah, I did.  Woops.  Let me try that again:

ANALYZE should be faster; reads only some pages.

VACUUM ANALYZE should be slower; reads them all.

Dunno why Pavel's seeing the opposite without more info.

Robert Haas
The Enterprise PostgreSQL Company

In response to


pgsql-hackers by date

Next:From: Simon RiggsDate: 2012-02-22 13:38:40
Subject: Re: VACUUM ANALYZE is faster than ANALYZE?
Previous:From: Robert HaasDate: 2012-02-22 13:32:04
Subject: Re: 16-bit page checksums for 9.2

Privacy Policy | About PostgreSQL
Copyright © 1996-2017 The PostgreSQL Global Development Group