Martijn van Oosterhout napsal(a):
On Tue, Jul 08, 2008 at 11:27:35AM +0200, Zdenek Kotala wrote:
Zdenek Kotala napsal(a):
I though more about it and I discussed it with Radek yesterday. The
problem is that collation must be created before user want to use CREATE
DATABASE ... COLLATE ... command. It inclines to have have pg_collation
as a global catalog, but ANSI specifies to use schema name in collation
specification and schemes are database specific ... It means that
pg_collation have to be non-shared catalog and new database only
inherits collation from template db. And CREATE DATABASE have to check
list of collation in template database :(.
thinking more ...
It must be shared catalog because pg_database will depend on it.
Not necessarily. pg_class is not shared yet without it you can't even
find pg_database. Same deal with pg_type. All it means is that
pg_collation in template1 must contain all the collations used in
template1, which shouldn't be hard to arrange.
I think, Collation situation is different, becasue pg_database will contains
column colname. pg_class (and all bootstrap catalog) only contains row which
specify that shared table exists and content is cloned to the new database from
template database. In corner case you can get context specific dependency for
example if Czech collation will have oid=10 in database test01 and Swedish
collation will have oid=10 in database test02. How to handle CREATE DATABASE and
connect database? OK it shouldn't happen in normal situation but ...
Zdenek
--
Zdenek Kotala Sun Microsystems
Prague, Czech Republic http://sun.com/postgresql
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