Re: STOP all user access except for admin for a few minutes?

Ha ha... thx Tino
Yes, I think this is way to go, strange how my mind climbs the wrong tree 
sometimes :)
I actually need to aquire a transaction across several dB's, check if the 
conditions are right, and then modify some tables, write and remove some 
triggers.
Transactions in postgres are 2 sophisticated, I dont think they will hold 
the locks at the level I need them.
But I was thinking (climbing out of the wrong tree;)... I can just aquire 
exclusive locks on the tables, and hey presto, users are on hold while the 
software checks the dB's.
Effectively creating a very rough transaction, with the lock scope needed? 
... ie it will keep users out long enough to align several dB's... I'm 
hoping?

From: "Tino Wildenhain" <tino@wildenhain.de>
>> ================ maybe I'm in the wrong tree================
>
> Yes I'm thinking that too:
>
>> Is it possible to make quick structural changes to postgres, with user 
>> activety?
>
> of course.
>
>> Maybe start a transaction that changes structure... wonder if that will 
>> stop or hold user activity???
>
> Usually not - all your DDL is done in a transaction just like any other
> access users would make. So it only fails (but as a whole) if you want
> to modify locked tables and such. But you would not end up w/ a partly
> changed database in any case. Just make sure you do everything in
> a transaction. No need to suspend user accounts for that.
>
>
> Regards
> Tino
>
>
>