From: | Souquieres Adam <adam(dot)souquieres(at)axege(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | pgsql-general(at)postgresql(dot)org, Merlin Moncure <mmoncure(at)gmail(dot)com> |
Subject: | Re: 8.4 -> 9.1 : ANALYSE VERBOSE; -> out of shared memory |
Date: | 2014-05-12 13:33:26 |
Message-ID: | 5370CDA6.4070308@axege.com |
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Lists: | pgsql-general |
Hi,
thanks you both for your quick answers,
Le 12/05/2014 15:29, Tom Lane a écrit :
> Merlin Moncure <mmoncure(at)gmail(dot)com> writes:
>> On Mon, May 12, 2014 at 7:57 AM, Souquieres Adam
>> <adam(dot)souquieres(at)axege(dot)com> wrote:
>>> when we play : ANALYSE VERBOSE; ( stat on all databases, with 500 tables and
>>> 1to DATA in all tables)
>>> we now have this message :
>>> org.postgresql.util.PSQLException: ERROR: out of shared memory Indice : You
>>> might need to increase max_locks_per_transaction.
>>> max_connections = 150
>>> max_locks_per_transaction = 128 # was at default val ( 64?), we already try
>>> to increase it without sucess
>> How high did you increase it? It's not uncommon to have to raise that
>> parameter significantly if you have a lot of tables. Try 2048.
We change the parameter from default value 64 to 128
> It's unsurprising for analyze across 500 tables to require 500 locks.
> However, with those settings you should already have 150*128 = 19200
> slots in the shared lock table, so there's no way that the analyze
> is eating them all. What else is going on in the system? How many
> entries do you see in pg_locks while this is happening?
>
> regards, tom lane
>
>
ANALYSE VERBOSE; should use only one transaction or one transaction per
table it analyse ?
anyway, i try too list pg_locks table during this issue and i'll post
you the result.
Adam
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