Concepts › CA IDMS/DB Reorg Reorganization Capabilities › Direct an Efficient Reorganization Through Parameters

Direct an Efficient Reorganization Through Parameters

In addition to the parameters that control internal physical reorganization functions for sets and records, some of CA IDMS/DB Reorg's parameters provide operational efficiency features. By using these parameters, you can direct a more efficient reorganization--one that is compatible with your processing environment and its requirements. The parameters give you the capabilities to:

• Interrupt the reorganization process. During a reorganization you may find it necessary to recover from a system failure, perform backup procedures, perform operations functions, or conserve and manage disk space. With the STOPAFTER parameter you can interrupt CA IDMS/DB Reorg after any individual step. Later, you can direct CA IDMS/DB Reorg to resume execution where it left off and complete the reorganization by using the RESTART parameter.
• Monitor the process through console communication. The DSPLYINT parameter lets you establish a console communication facility through which you can display CA IDMS/DB Reorg's status at specified time intervals, at the end of each step, or on demand. In addition to establishing console communication, you can also monitor the reorganization from TSO terminals by using the TSOUSERS parameter.

  Once the communication facility is established through the DSPLYINT parameter, you can issue dynamic commands from the operator console to view the status, to stop or cancel the reorganization process, and to change the interval at which the status is displayed.

• Sweep or not sweep non-copy areas. When the area you are reorganizing has set linkage with records in another area, CA IDMS/DB Reorg must access those records to update their pointers. CA IDMS/DB Reorg sweeps the non-copy area and create extracts for any records with set linkage unless directed otherwise.

  When the non-copy area contains few record occurrences with set linkage to records in a copy area, random access of these records (set walking) is the most efficient way to create the necessary pointer extracts. The NOSWEEP parameter directs CA IDMS/DB Reorg to walk only the sets which are necessary to create pointer extracts.

  If CA IDMS/DB Reorg can generate pointer extracts for a record in a non-copy area by using the NEXT and PRIOR pointers in the copy area, the NOSWEEP parameter is turned on automatically, and no sets are walked.

  To determine whether area sweeping or set walking is more efficient it is necessary to know the number of record (or active set) occurrences in an area. You can use the CA IDMS/DB Analyzer Set Report to give you this information. If you are not sure which mode is faster, use the area sweep default.

Parameters and Commands includes details for each parameter and command.