Re: [HACKERS] PG_UPGRADE status?

> Bruce Momjian wrote:
> > pg_upgrade will not work in converting from <= 6.4.* to 6.5.* because
> > the on-disk date format changed in 6.5.  Hopefully, 6.6 will allow
> > pg_upgrade for 6.5.* databases.  We try not to change the on-disk
> > format, but sometimes we have to.  MVCC required it for 6.5.*.
> 
> Ok, answers my question.  It would be nice to be able to say:
> pg_upgrade --source-pgdata=/var/lib/pgsql-old --pgdata=/var/lib/pgsql
> and have any version PostgreSQL database converted to the newest, but
> maybe that's a pipe dream.  Sure would make upgrades easier, on
> everybody, not just RedHatters -- such as those who have large amounts
> of large objects. 
> 
> If I were a better C coder, and had more experience with the various
> versions' on-disk formats, I'd be happy to try to tackle it myself. 
> But, I'm not that great of a C coder, nor do I know the data structures
> well enough.  Oh well.


You would have to convert tons of rows of data in raw format.  Seems
like dump/reload would be easier.

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