From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
---|---|
To: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
Cc: | Simon Riggs <simon(at)2ndQuadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: [SPAM?]: Re: Support for REINDEX CONCURRENTLY |
Date: | 2012-12-10 22:39:42 |
Message-ID: | 20121210223941.GA25483@awork2.anarazel.de |
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Lists: | pgsql-hackers |
On 2012-12-10 17:27:45 -0500, Peter Eisentraut wrote:
> On 12/10/12 5:21 PM, Simon Riggs wrote:
> > On 10 December 2012 22:18, Peter Eisentraut <peter_e(at)gmx(dot)net> wrote:
> >> On 12/8/12 9:40 AM, Tom Lane wrote:
> >>> I'm tempted to propose that REINDEX CONCURRENTLY simply not try to
> >>> preserve the index name exactly. Something like adding or removing
> >>> trailing underscores would probably serve to generate a nonconflicting
> >>> name that's not too unsightly.
> >>
> >> If you think you can rename an index without an exclusive lock, then why
> >> not rename it back to the original name when you're done?
> >
> > Because the index isn't being renamed. An alternate equivalent index
> > is being created instead.
>
> Right, basically, you can do this right now using
>
> CREATE INDEX CONCURRENTLY ${name}_tmp ...
> DROP INDEX CONCURRENTLY ${name};
> ALTER INDEX ${name}_tmp RENAME TO ${name};
>
> The only tricks here are if ${name}_tmp is already taken, in which case
> you might as well just error out (or try a few different names), and if
> ${name} is already in use by the time you get to the last line, in which
> case you can log a warning or an error.
>
> What am I missing?
I don't think this is the problematic side of the patch.
The question is rather how to transfer the dependencies without too much
ugliness or how to swap oids without a race. Either by accepting an
exlusive lock or by playing some games, the latter possibly being easier
with renaming...
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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