Implementing Siebel Business Applications on DB2 UDB for z/OS > Maintenance Considerations for z/OS >

About Coordinated Universal Time and DB2 for z/OS

The Global Deployment Guide contains information on using Coordinated Universal Time (UTC). Since Release 7.x of Siebel Business Applications, the UTC System Preference default value is TRUE so, if you do not want to implement UTC, you must change this value to FALSE.

When installing and configuring UTC on DB2 for z/OS, you should consider the following:

• The UTC upgrader is not supported on DB2 for z/OS.

  Configure UTC using a fresh database install only.

• The Siebel UTC implementation only works if the system time that the database software uses is in UTC.

  Any system or database parameter that implements a time zone different to UTC must remain at zero. The use of any other value is not supported, as it effectively returns the database configuration to a local time zone.

  As an example, the z/OS system parameter, TIMEZONE, can be set in the CLOCKxx member of SYS1.PARMLIB. For a correct Siebel UTC implementation, the value of this parameter must be zero, as shown:

  TIMEZONE W.00.00.00 /* GMT */