> 1. SchemaCache.CheckSchemaVersionTable has to be used just once to create
> the database structure, isn't it?

Once is sufficient. You also need to plumb in the appropriate action to
clear out your own schema information on the client.

> 2. If I don't assign any schemacache dir it is suposed to to use any

schema

> cache, isn't it?

It always uses an in memory schema cache. Using the SchemaCacheDir is just
your way of allowing the schema information to be persisted on the client.

Jason Wharton
CPS - Mesa AZ
http://www.ibobjects.com