On Wed, 2015-12-02 at 10:47 -0800, Christophe Pettus wrote:
> On Dec 2, 2015, at 10:29 AM, Tom Lane <t...@sss.pgh.pa.us> wrote:
> > The short answer is that heavyweight tuple locks can be taken
> > internally
> > by UPDATE, DELETE, and other row-level operations, and the
> > specifics of
> > which type of lock any given action takes are implementation
> > details that
> > can change from time to time.
> 
> Great, thank you!
> 
> --
> -- Christophe Pettus
>    x...@thebuild.com
> 
> 
> 


Don't know if this helps at all. On the hot standby doco.

http://www.postgresql.org/docs/9.4/static/hot-standby.html

About two-thirds of the way down it refers to the pg_locks table.

Are you using "hot standby"?




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