Re: Details for planned template0/template1 change

At 11:48 13/11/00 -0500, Tom Lane wrote:
>
>5. pg_dump should ignore objects with OID <= lastsysoid of the target
> database.

I think it should ignore objects with OID <= lastsysoid of template0; then
when it does a restore, it should use 'WITH TEMPLATE template0'. At least
this should be an option.

>I think that
>a dballowconn flag might have other uses anyway, such as temporarily
>disallowing new connections to a database you are doing major work in.

eg. while a restore script is running...

BTW: are there any nice ways to:

- set the flag
- kick current users off without corrupting memory

(ie. shutdown a single database).

>lastsysoid will probably always be the same for all databases in an
>installation, since they'll all inherit the value from template0 or
>template1. However, there is the possibility of changing it to exclude
>some items from backup, so I'm continuing to treat it as a per-database
>value.

Sounds fine; but we need to use lastsysoid of template0 in pg_dump. Consider:

- add function foo() to template1, OID=100000
- create db1 (inherits foo())
- update function foo() in template1, and also update it in db1. New OID >
100000
- dump db1 - will dump foo().
- restore db1 using template1->crash

However, dumping based oi lastsysoid of template0, then restoring based on
template0 works...

Otherwise sounds good!

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