Re: WIP: getting rid of the pg_database flat file

Alvaro Herrera <alvherre@commandprompt.com> writes:
> Are you going to commit the current patch?  We can remove the hacks that
> support autovacuum later.  I was thinking that InitPostgres could be
> split in two, with the first half ending just after
> RelationCacheInitializePhase2.  Then workers could figure out their
> database names and go off on the second half; regular backends would
> just call the two halves directly.  That way, the launcher could use the
> first half.

Yeah, I intend to commit what I have after I finish cleaning up a few
loose ends (just found a bug with CLOBBER_CACHE_ALWAYS), and then we
can take a look at making autovacuum play with it.  I envision three
or four commits before flatfiles.c can disappear.

> (BTW I assume there is going to be an index on OID
> available on pg_database after the shared relcache initialization?)

Yeah.  That's not in the patch I sent last night, but the OID index has
to become nailed too in order to allow removing FindMyDatabaseByOid.
However, I'm not sure that the AV launcher could touch it --- were
you thinking that would be important?
        regards, tom lane