Re: pg_upgrade project status

Tom Lane píše v st 28. 01. 2009 v 14:06 -0500:

> Trying to do catalog upgrade
> in-place is going to be a complete mess.  I'd be interested to know,
> for example, how you imagine rearranging the contents of pg_class would
> work.  You don't get to modify pg_class if you can't even find it, which
> you can't because you can't read it. 

It is relatively easy. There are very high design:

1) upgrade move old catalog table into save location. We can create for
example special tablespace for it

2) bootstrap creates catalog + create records for old catalog structure

3) data will be copied like 

INSERT INTO pg_class select from pg_upgrade.pg_class where oid>16...

In reality it will be more complicated command but pure SQL.

    Zdenek