Re: Alerting on memory use and instance crash

On Wed, Oct 8, 2025 at 2:58 PM sud <suds1434(at)gmail(dot)com> wrote:
[snip]

> Do you mean in normal Postgres it's alway a single instance/memory and
> single storage attached? then I also do not see any such cluster level
> views in aws aurora postgres too?
>

Yup.

> Pardon if it's a silly one to ask.
>

A Google for "what's the difference between Oracle and Postgresql" _might_
help. I've never done that, so don't know what you'll find.

As far as how Aurora works... you need to ask AWS. It's been too heavily
modified for a list dedicated to pure/unmodified Postgresql to help.

> On Wed, Oct 8, 2025 at 9:52 PM Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com>
> wrote:
>
>> On 10/8/25 08:42, sud wrote:
>> > Hi Experts,
>> >
>> > It's postgres version 16. I have two questions on alerting as below.
>> >
>> > 1)If we want to have alerting on any node/instance that gets crashed :-
>> > In other databases like Oracle the catalog Views like "GV$Instance"
>> used
>> > to give information on whether the instances are currently active/down
>> > or not. But in postgres it seems all the pg_* views are instance
>> > specific and are not showing information on the global/cluster level
>> but
>> > are restricted to instance level only. So is there any other way to
>> > query the pg_* views to have alerts on the specific instance crash?
>>
>> 1) When you say instance do you mean database?
>>
>> 2) Not all system tables/views are database only.
>>
>> For instance:
>> https://www.postgresql.org/docs/current/catalog-pg-database.html
>> https://www.postgresql.org/docs/current/catalog-pg-auth-members.html
>> https://www.postgresql.org/docs/current/catalog-pg-authid.html
>> https://www.postgresql.org/docs/current/view-pg-roles.html
>>
>>
>> > 2)Is there a way to fetch the data from pg_* view to highlight the
>> > specific connection/session/sqls which is using high memory in postgres?
>> >
>> > Appreciate your guidance.
>> >
>> > Regards
>> > Sud
>>
>>
>> --
>> Adrian Klaver
>> adrian(dot)klaver(at)aklaver(dot)com
>>
>

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