Re: Patch: show relation and tuple infos of a lock to acquire

On Tue, Mar 18, 2014 at 5:51 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Alvaro Herrera <alvherre@2ndquadrant.com> writes:
>> 1. MyProcPort contains the database name; no need for the
>> get_database_name() call in there.
>
> Wait. A. Minute.  This patch wants to print the current database name in
> the message?  What on earth for?  What other error messages do you see
> doing that?

The message for exclusive lock on tuple print the database information.

"LOG:  process 3012 still waiting for ExclusiveLock on tuple (0,1) of
relation 57
499 of database 12045 after 1014.000 ms"

I think database related info (dbid) will be printed in other Lock
related messages
as well, for example:

LOG:  process 1332 still waiting for AccessExclusiveLock on relation 16384 of da
tabase 12077 after 1014.000 ms

I believe the reason is to uniquely identify a tuple on which
transaction is waiting.


With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com