Re: dropping an index inside a transaction - Mailing list pgsql-general

From Scott Marlowe
Subject Re: dropping an index inside a transaction
Date
Msg-id CAOR=d=2BzTcr7Zgv7oyig9VM1ajhijLWD7-kgvbz_wBveG30EQ@mail.gmail.com
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In response to dropping an index inside a transaction  (Andy Chambers <achambers@mcna.net>)
List pgsql-general
On Sat, Mar 17, 2012 at 8:37 PM, Andy Chambers <achambers@mcna.net> wrote:
> Hi All,
>
> If one drops an index inside a transaction, is that index still usable
> by other transactions?  My use-case is loading millions of records
> into a heavily indexed table.  I'd like to speed up the load by
> temporarily dropping the indices.  I'm wondering if I can do this
> inside a transaction so that the rest of the application can still
> benefit from the indices.

If another transaction is already relying on the index you can't drop
it.  Once you drop it in a transaction all other queries against the
tables will be waiting behind the exclusive lock on the transaction to
finish to access the table.

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