Re: Building multiple indexes concurrently - Mailing list pgsql-performance

From Tom Lane
Subject Re: Building multiple indexes concurrently
Date
Msg-id 27969.1268836243@sss.pgh.pa.us
Whole thread Raw
In response to Re: Building multiple indexes concurrently  (Greg Smith <greg@2ndquadrant.com>)
Responses Re: Building multiple indexes concurrently  (Rob Wultsch <wultsch@gmail.com>)
List pgsql-performance
Greg Smith <greg@2ndquadrant.com> writes:
> Rob Wultsch wrote:
>> At a minimum I assume that if both of the commands were started at
>> about the same time they would each scan the table in the same
>> direction and whichever creation was slower would benefit from most of
>> the table data it needed being prepopulated in shared buffers. Is this
>> the case?

> This might be optimistic;

No, it's not optimistic in the least, at least not since we implemented
synchronized seqscans (in 8.3 or thereabouts).

            regards, tom lane

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