Re: Need to find the no. of connections for a database

Need to lock around 10 tables.  Let me try with pg_advisory_lock().

On Thursday, 27 February, 2020, 07:39:13 pm IST, Ireneusz Pluta/wp.pl <ipluta(at)wp(dot)pl> wrote:

W dniu 2020-02-27 o 14:37, sivapostgres(at)yahoo(dot)com pisze:
> Hello,
>
> I'm saying isolation will not work out to my requirement.   The steps.
>
> 1.  On completion of all entries by all,  say for a day.
> 2.  Lock, so that no one enters any other data.
> 3.  Create a report from the entered data.
> 4.  Create / Modify required entries from the values arrived in the report. [ long process ]
> 5.  Once completed, commit all data.
> 6.  Unlock, so that other users can enter data again.  Data entered will be for another date. 
> Data cannot [should] not entered for the processed date.
>
so wouldn't pg_advisory_lock() in step 2, and pg_advisory_unlock() in step 6, make the process work
in the way you expect?

https://www.postgresql.org/docs/current/functions-admin.html#FUNCTIONS-ADVISORY-LOCKS

>
>
> On Thursday, 27 February, 2020, 06:29:00 pm IST, Ireneusz Pluta/wp.pl <ipluta(at)wp(dot)pl> wrote:
>
>
> W dniu 2020-02-27 o 12:35, sivapostgres(at)yahoo(dot)com <mailto:sivapostgres(at)yahoo(dot)com> pisze:
>
> > I need to prevent other users from entering any transaction till I finish taking reports from my
> > application.  All users will be using the same application, from which this report is supposed to
> > be printed.
>
> >
> maybe advisory lock is what you need?
>
> https://www.postgresql.org/docs/current/explicit-locking.html#ADVISORY-LOCKS
>
>
>
>