Re: Multiple index builds on same table - in one sweep?

On Mon, Apr 11, 2011 at 12:39 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Scott Marlowe <scott.marlowe@gmail.com> writes:
>> On Mon, Apr 11, 2011 at 1:41 AM, Greg Smith <greg@2ndquadrant.com> wrote:
>>> Scott Marlowe wrote:
>>>> FYI, in 8.3.13 I get this for all but one index:
>>>> ERROR:  deadlock detected
>
>>> Is that trying to build them by hand?  The upthread request here is actually
>>> already on the TODO list at http://wiki.postgresql.org/wiki/Todo and it
>>> talks a bit about what works and what doesn't right now:
>
>> Yes, by hand.  It creates an entry for the index but lists but marks
>> it as INVALID
>
> Are you trying to use CREATE INDEX CONCURRENTLY?  AFAIR that doesn't
> support multiple index creations at the same time.  Usually you wouldn't
> want that combination anyway, since the point of CREATE INDEX
> CONCURRENTLY is to not prevent foreground use of the table while you're
> making the index --- and multiple index creations are probably going to
> eat enough I/O that you shouldn't be doing them during normal operations
> anyhow.
>
> Just use plain CREATE INDEX.

I thought they'd stand in line waiting on each other.  I'll give it a try.