Обсуждение: Getting
Hello,
I am a newb in Postgres coming from Oracle. Does anyone know if it's possible to see the plan being executed by Postgres for an active sql statement (from pg_stat_activity). This is to be able to troubleshoot poor performing ones and in Oracle we are able to retrieve such a plan.
I am a newb in Postgres coming from Oracle. Does anyone know if it's possible to see the plan being executed by Postgres for an active sql statement (from pg_stat_activity). This is to be able to troubleshoot poor performing ones and in Oracle we are able to retrieve such a plan.
Additionally, how do I see the actual sql statement that shows as "<unnamed portal x>".
Thanks so much for any advice you all may have.
-Dan
Thanks so much for any advice you all may have.
-Dan
On Wed, Jan 23, 2013 at 11:50 PM, Dan Ng <surfnet@yahoo.com> wrote:
Hello,
I am a newb in Postgres coming from Oracle. Does anyone know if it's possible to see the plan being executed by Postgres for an active sql statement (from pg_stat_activity). This is to be able to troubleshoot poor performing ones and in Oracle we are able to retrieve such a plan.Additionally, how do I see the actual sql statement that shows as "<unnamed portal x>".
Thanks so much for any advice you all may have.
-Dan
Welcome...!!!
You need to use additional module to write query plan in logs i.e., AUTO_EXPLAIN.
---
Regards,
Raghavendra
EnterpriseDB Corporation
Of course you can also see what the query plan will be without having to run the query through a standard explain query:
http://www.postgresql.org/docs/9.0/static/sql-explain.html
From: pgsql-admin-owner@postgresql.org [pgsql-admin-owner@postgresql.org] on behalf of Raghavendra [raghavendra.rao@enterprisedb.com]
Sent: Wednesday, January 23, 2013 9:52 PM
To: Dan Ng
Cc: pgsql-admin@postgresql.org
Subject: Re: [ADMIN] Getting
Sent: Wednesday, January 23, 2013 9:52 PM
To: Dan Ng
Cc: pgsql-admin@postgresql.org
Subject: Re: [ADMIN] Getting
On Wed, Jan 23, 2013 at 11:50 PM, Dan Ng <surfnet@yahoo.com> wrote:
Hello,
I am a newb in Postgres coming from Oracle. Does anyone know if it's possible to see the plan being executed by Postgres for an active sql statement (from pg_stat_activity). This is to be able to troubleshoot poor performing ones and in Oracle we are able to retrieve such a plan.Additionally, how do I see the actual sql statement that shows as "<unnamed portal x>".
Thanks so much for any advice you all may have.
-Dan
Welcome...!!!
You need to use additional module to write query plan in logs i.e., AUTO_EXPLAIN.
---
Regards,
Raghavendra
EnterpriseDB Corporation
Dan -- >________________________________ > From: Michael Holt <MHolt@terapeak.com> >To: Raghavendra <raghavendra.rao@enterprisedb.com>; Dan Ng <surfnet@yahoo.com> >Cc: "pgsql-admin@postgresql.org" <pgsql-admin@postgresql.org> >Sent: Wednesday, January 23, 2013 9:55 PM >Subject: Re: [ADMIN] Getting > > > >Of course you can also see what the query plan will be without having to run the query through a standard explain query: > > >http://www.postgresql.org/docs/9.0/static/sql-explain.html > > I am not familiar with the Oracle tools, but you should note that the "EXPLAIN ANALYZE" does actually do the transaction,so if you doing an update / insert / delete you may want to wrap it in an explicit transaction and then rollit back. HTH, Greg Williamson
Hi,
The problem is the current_query (in pg_stat_activity) contains bind variables and I can't just take it to do the explain (and, of course I don't know the values of the bind variables).
On a related issue, how can I see the actual sql statement when the current_query shows "<unnamed portal x>".
pg_cursors is only accessible within the same transaction and as a DBA we want to see that cursor of any active transactions.
pg_cursors is only accessible within the same transaction and as a DBA we want to see that cursor of any active transactions.
Thanks,
-Dan
From: Greg Williamson <gwilliamson39@yahoo.com>
To:
Cc: "pgsql-admin@postgresql.org" <pgsql-admin@postgresql.org>
Sent: Thursday, January 24, 2013 1:08 AM
Subject: Re: [ADMIN] Getting
To:
Cc: "pgsql-admin@postgresql.org" <pgsql-admin@postgresql.org>
Sent: Thursday, January 24, 2013 1:08 AM
Subject: Re: [ADMIN] Getting
Dan --
>________________________________
> From: Michael Holt <MHolt@terapeak.com>
>To: Raghavendra <raghavendra.rao@enterprisedb.com>; Dan Ng <surfnet@yahoo.com>
>Cc: "pgsql-admin@postgresql.org" <pgsql-admin@postgresql.org>
>Sent: Wednesday, January 23, 2013 9:55 PM
>Subject: Re: [ADMIN] Getting
>
>
>
>Of course you can also see what the query plan will be without having to run the query through a standard explain query:
>
>
>http://www.postgresql.org/docs/9.0/static/sql-explain.html
>
>
I am not familiar with the Oracle tools, but you should note that the "EXPLAIN ANALYZE" does actually do the transaction, so if you doing an update / insert / delete you may want to wrap it in an explicit transaction and then roll it back.
HTH,
Greg Williamson
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