10000+ cathegories and forums

[Illthis]

Damn.
How to manage datastore[forumcache] with 10000 and more forums and cathegories in one mysql-db?

--------------- Added [DATE]1237154011[/DATE] at [TIME]1237154011[/TIME] ---------------

I put about 10000 forums in the "forum"-mysql-table. always i run the misc.php?do=updateforum script i get a mysql database error, like this:

REPLACE INTO vb_datastore
(title, data, unserialize) VALUES ...
20:25

MySQL-Fehler : Got a packet bigger than 'max_allowed_packet' bytes
Fehler-Nr. : 1153
Fehler-Zeit : Sunday, 15.03.2009 @ 20:18:57
Datum : Sunday, 15.03.2009 @ 20:19:30
Skript : XXX/misc.php?do=updateforum&startat=11234&pp=100
Referrer : XXX/misc.php?do=updateforum&startat=11134&pp=100
IP-Adresse : XXX.XXX.XXX.XXX
Benutzername : XXX
Klassenname : vb_database
MySQL-Version : 4.1.22-max-log

Unfortunately my hoster dont allows me to change the max_allowed_packet size.
I dont get $config['Datastore']['class'] = 'vB_Datastore_Filecache'; in config.php working.
"includes/datastore/" and "includes/datastore/datastore_cache.php" has chmod777.
Is there anything to take care off?

Any idea for a solution?