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Request for new column in pg_namespace 4+ messages / 3 participants [nested] [flat]
* Request for new column in pg_namespace @ 2024-12-15 16:58 Ron Johnson <[email protected]> 0 siblings, 1 reply; 4+ messages in thread From: Ron Johnson @ 2024-12-15 16:58 UTC (permalink / raw) To: pgsql-general https://www.postgresql.org/docs/current/catalog-pg-namespace.html Currently, when I want to query all "userland" tables, I write something like: select ... from pg_class cl, pg_namespace nsp where cl.relnamespace = nsp.oid and nsp.nspname not like 'pg_% and nsp.nspname != 'information_schema'; A new boolean column named "indissystem" that's true only for system relations would make *many* maintenance queries cleaner, since they'd look like: select ... from pg_class cl, pg_namespace nsp where cl.relnamespace = nsp.oid and nsp.indissystem = false; -- Death to <Redacted>, and butter sauce. Don't boil me, I'm still alive. <Redacted> lobster! ^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: Request for new column in pg_namespace @ 2024-12-15 17:15 Pavel Stehule <[email protected]> parent: Ron Johnson <[email protected]> 0 siblings, 1 reply; 4+ messages in thread From: Pavel Stehule @ 2024-12-15 17:15 UTC (permalink / raw) To: Ron Johnson <[email protected]>; +Cc: pgsql-general Hi ne 15. 12. 2024 v 17:59 odesílatel Ron Johnson <[email protected]> napsal: > https://www.postgresql.org/docs/current/catalog-pg-namespace.html > > Currently, when I want to query all "userland" tables, I write something > like: > select ... > from pg_class cl, pg_namespace nsp > where cl.relnamespace = nsp.oid > and nsp.nspname not like 'pg_% > and nsp.nspname != 'information_schema'; > > A new boolean column named "indissystem" that's true only for system > relations would make *many* maintenance queries cleaner, since they'd > look like: > select ... > from pg_class cl, pg_namespace nsp > where cl.relnamespace = nsp.oid > and nsp.indissystem = false; > > oid of all system objects is less then 0x4000 Regards Pavel > -- > Death to <Redacted>, and butter sauce. > Don't boil me, I'm still alive. > <Redacted> lobster! > ^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: Request for new column in pg_namespace @ 2024-12-15 17:29 Tom Lane <[email protected]> parent: Pavel Stehule <[email protected]> 0 siblings, 1 reply; 4+ messages in thread From: Tom Lane @ 2024-12-15 17:29 UTC (permalink / raw) To: Pavel Stehule <[email protected]>; +Cc: Ron Johnson <[email protected]>; pgsql-general Pavel Stehule <[email protected]> writes: > ne 15. 12. 2024 v 17:59 odesílatel Ron Johnson <[email protected]> > napsal: >> A new boolean column named "indissystem" that's true only for system >> relations would make *many* maintenance queries cleaner, since they'd >> look like: >> select ... > oid of all system objects is less then 0x4000 That wouldn't help for excluding temp schemas, and it's not totally trustworthy for information_schema either. But I think the real problem with Ron's proposal is that it presumes there is a one-size-fits-all notion of "system schema". As a counterexample, for some maintenance activities (such as vacuuming) you might wish to process pg_catalog. What I'd suggest as an improvement that could be implemented immediately is to wrap the checks in a user-defined function like "is_system_schema(nspname name)". regards, tom lane ^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: Request for new column in pg_namespace @ 2024-12-15 17:46 Ron Johnson <[email protected]> parent: Tom Lane <[email protected]> 0 siblings, 0 replies; 4+ messages in thread From: Ron Johnson @ 2024-12-15 17:46 UTC (permalink / raw) To: pgsql-general On Sun, Dec 15, 2024 at 12:29 PM Tom Lane <[email protected]> wrote: > Pavel Stehule <[email protected]> writes: > > ne 15. 12. 2024 v 17:59 odesílatel Ron Johnson <[email protected]> > > napsal: > >> A new boolean column named "indissystem" that's true only for system > >> relations would make *many* maintenance queries cleaner, since they'd > >> look like: > >> select ... > > > oid of all system objects is less then 0x4000 > > That wouldn't help for excluding temp schemas, and it's not totally > trustworthy for information_schema either. > > But I think the real problem with Ron's proposal is that it presumes > there is a one-size-fits-all notion of "system schema". As a > counterexample, for some maintenance activities (such as vacuuming) > you might wish to process pg_catalog. > In that case, one would explicitly mention pg_catalog, no? where cl.relnamespace = nsp.oid and (nsp.indissystem = false or nsp.nspname = 'pg_catalog'); > What I'd suggest as an improvement that could be implemented > immediately is to wrap the checks in a user-defined function > like "is_system_schema(nspname name)". > Good idea. -- Death to <Redacted>, and butter sauce. Don't boil me, I'm still alive. <Redacted> lobster! ^ permalink raw reply [nested|flat] 4+ messages in thread
end of thread, other threads:[~2024-12-15 17:46 UTC | newest] Thread overview: 4+ messages (download: mbox mbox.gz follow: Atom feed) -- links below jump to the message on this page -- 2024-12-15 16:58 Request for new column in pg_namespace Ron Johnson <[email protected]> 2024-12-15 17:15 ` Pavel Stehule <[email protected]> 2024-12-15 17:29 ` Tom Lane <[email protected]> 2024-12-15 17:46 ` Ron Johnson <[email protected]>
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