Upgrade Guide for DB2 UDB for z/OS and OS/390 > Database and UI Upgrade Planning > Planning Your Upgrade >

Executions of Jobs Using Siebel-Scheduled Mode or Vendor-Scheduled Mode

Before you perform a production upgrade, determine whether you will execute the jobs using Siebel-provided job scheduling or a third-party vendor scheduler. Choose your scheduling mode carefully, because once you begin an upgrade process under a selected mode, you cannot change your scheduling mode or reverse this decision.

If you plan to use a third-party job scheduler, you will find it useful to first generate the upgrade scripts using Siebel scheduling to gain an understanding of job dependencies, because the Siebel-provided job scheduler submits dependent jobs by their predecessors.