Implementing Siebel eBusiness Applications on DB2 UDB for z/OS and OS/390 > Preparing for Implementation on the DB2 Host >

Setting Up the Subsystem

Siebel Systems supports production deployments of Siebel eBusiness Applications in both separate and shared DB2 subsystems. However, setting up a separate subsystem is preferable for Siebel applications, particularly for larger deployments, for the following reasons:

  • DSNZPARM optimization. The DSNZPARMs used with this release of Siebel eBusiness Applications are optimized for the Siebel application, but might not be optimal for use with non-Siebel applications. It is recommended, but not required, that you run the Siebel eBusiness Application on its own subsystem.
  • OLTP and OLAP characteristics. Siebel applications possess the characteristics of both an OLTP and OLAP application. However, most other vendors' applications have the characteristics of either one or the other.
  • DB2 maintenance requirements. This release of Siebel eBusiness Applications requires the application of a number of maintenance activities that are documented in an informational APAR that can be located on IBM's Web site.

    CAUTION:  It is crucial that you apply all maintenance releases in the informational APAR to the subsystem that you set up. Otherwise, operating anomalies and unpredictable behavior might occur.

  • System catalog locking during Siebel database recovery. With the Siebel 7.7 approach of defining one table space per a database, this is not a problem. However, if you use database layouts with multiple table spaces per database, recovery of the Siebel Schema might affect other applications on a shared DB2 subsystem if the system catalog becomes locked during the recovery process. Because recovery typically requires the restoration of all Siebel table spaces, locking could last many hours.

Even though a shared DB2 subsystem is preferable for implementing Siebel eBusiness Applications, there are numerous successful Siebel deployments in shared DB2 subsystems.

Implementing Siebel eBusiness Applications on DB2 UDB for z/OS and OS/390