Setting up Db2

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In a high availability environment, there is little sense in making SAP Central Services (SCS) highly available if the database server is not highly available. For this reason, you should use Db2 data sharing.

Because SCS does not connect to the database, there is no technical requirement to install it in one of the LPARs containing a Db2 subsystem, although it is possible to do so.

Using the *Db2 add-on policy to perform a light restart

In case of an LPAR or Db2 member failure, a restart of the Db2 member is needed to allow for recovery. The *Db2 add-on policy that is shipped with SA z/OS®, automates this restart in the following way:

  • Normal restart in place, if the LPAR is available.
  • Light restart on another LPAR in case of a failure of the original LPAR.

The LIGHT option of the START DB2 command performs the following:

  1. Restarts a Db2 data sharing member with a minimal storage footprint.
  2. Terminates the Db2 member normally after freeing any retained locks that were held by this member.