[Koha] Cron Job Questions Koha 3 with Zebra on Ubuntu 7.10

When a new item is added to the catalog it is not showing up until the rebuild_zebra.pl is run. The staff doing the cataloging would like to be able to have access to the records immediately. 1. What cron jobs or other procedures should be running, and how often should they run, to enable the records to update right away? 2. And a related question.... What cron jobs do you recommend running (and how often) in a "typical" koha w/ Zebra installation. Thanks, Bruce Raymond