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SUF (also known as XBM) considerations

To enhance performance, REORG PLUS uses several features of SUF (also known as XBM) during portions of the reorganization process.

Related topics

Using SUF (also known XBM) to enable zIIP processing

Operational considerations

If you have installed the required version of 

SUF

 (also known as 

XBM

), REORG PLUS can use the following 

SUF

 (also known as 

XBM

) functions:

  • Software snapshot functions for a SHRLEVEL CHANGE reorganization
  • Instant Snapshot technology for the nonpartitioned indexes during a SHRLEVEL REFERENCE or SHRLEVEL CHANGE partial table space reorganization
  • zIIP processing

SUF(also known as XBM) are licensed, installed, and maintained separately from REORG PLUS. You can use either SUF (also known as XBM), depending on the license that you have obtained:

  • A license for the full version of the SUF (also known as XBM) product authorizes you to use all SUF (also known as XBM) features.
  • A license for SUF (also known as XBM) authorizes you to use only the snapshot and zIIP-processing features of SUF (also known as XBM).

Important

If you are licensed only for a BMC solution that contains REORG PLUS, your license authorizes you to use SUF (also known as XBM), not the full version of SUF (also known as XBM).

For more information, see the

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documentation.

Using SUF (also known as XBM) with nonpartitioned indexes

For a SHRLEVEL REFERENCE or SHRLEVEL CHANGE partial table space reorganization, REORG PLUS can use Instant Snapshot technology to copy each nonpartitioned index to a staging data set.

Instant Snapshot copies the entire nonpartitioned index in one operation, thus eliminating the multiple reads and writes of the traditional copy method (for SHRLEVEL REFERENCE) and the software snapshots (for SHRLEVEL CHANGE).

For the steps to take to use Instant Snapshot technology in this case, see  Instant Snapshot with nonpartitioned indexes.

Using SUF (also known as XBM) with SHRLEVEL CHANGE

By using the software snapshot functions of SUF (also known as XBM) when performing a SHRLEVEL CHANGE reorganization, REORG PLUS can reorganize and apply the log records to a consistent image of the data while the data is available for RW operations.

Using SUF (also known as XBM) also allows you to monitor and alter the execution of the reorganization by using the MVS console or the SUF (also known as XBM) Utility Monitor.

For REORG PLUS processing, software snapshots are the most efficient and require the least amount of time to register. For proper REORG PLUS operation, ensure that SUF (also known as XBM) is configured with sufficient cache for the number of concurrent snapshots and the level of Db2 update activity at your site. For specific cache configuration information, see the

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documentation.

REORG PLUS does not use the traditional hardware snapshot functions of SUF (also known as XBM), even if SUF (also known as XBM) is configured to take hardware snapshots.

For the steps to take to run a SHRLEVEL CHANGE reorganization, see Running a SHRLEVEL CHANGE reorganization.

 

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