Adopting new version 11.5 functionality in database applications and routines

After upgrading to version 11.5, enhance the functionality and improve the performance of your database applications by adopting new version 11.5 functionality.

Before you begin

You must upgrade your Db2® server to version 11.5.


For applications that access upgraded databases, perform any of the following steps to adopt the specified version 11.5 functionality:

  • Enable the batch CALL statement support in CLI applications to optimize network flow by specifying an array size with the SQL_ATTR_PARAMSET_SIZE statement attribute and provide argument data in form of an array. For more details, see Calling stored procedures from CLI applications.
  • Use NOT ENFORCED primary key and unique constraints to avoid performance costs during insert, update, and delete operations on a table and space requirements that are associated with enforcing a unique constraint when it is known that the data already conforms to the unique constraint. It also provides the same potential performance benefits for queries. Fore more details, see Informational constraints.

What to do next

If you upgraded from Db2 version 9.7, adopt functionality introduced in version 9.7 in your database applications and routines. See Adopting new Db2 version 9.7 functionality in database applications and routines in the Upgrading to Db2 version 9.7 guide for details.