Re: Empty materialized view

On 3/24/24 13:58, Thiemo Kellner wrote:
> Am 24.03.2024 um 21:50 schrieb Adrian Klaver:
>> On 3/24/24 13:36, Thiemo Kellner wrote:
>> It does depending on the order of viewing. Namely if you viewed the
>> 'old' empty MV in the outside session before you dropped/created the
>> 'new' MV and committed the changes.
>
> Something like the viewing session is in a transaction before the
> (re-)creation of the mv?
>
> The view session is on auto commit. (It's sole purpose to query stuff
> and not to have explicitly terminate transactions do to syntax errors
> and so on.)

Autocommit will only affect actions in that session, it will not make
the other sessions actions visible. That depends on the other sessions
committing actions.

See:

https://www.postgresql.org/docs/current/transaction-iso.html

>
> Feeling quite dumb now. But then, there neither is data visible in the
> install session.
>
> insert data into TASK_DEPENDENCY⠒V
> INSERT 0 34

The above says the data was inserted.

> COMMIT
>  count
> -------
>      0

Where and when was the count query run?

> (1 row)
>
>
> Thanks for taking care.

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com