Enabling read/write access to your data

You can use the SHRLEVEL CHANGE option to enable read/write access to your data during check processing.

To enable SHRLEVEL CHANGE

1. Ensure that a currently supported version of XBM or SUF (as described in Software requirements) is installed and available to CHECK PLUS.
2. XBM and SUF require a started task.
3. Create and activate the XBM configuration that contains the appropriate cache attributes.
4. Create and activate the XBM configuration that contains the appropriate cache attributes.

For proper CHECK PLUS performance, ensure that XBM or SUF is cond 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 SNAPSHOT UPGRADE FEATURE for DB2 documentation.

1.  Specify the SHRLEVEL CHANGE option on your CHECK command statement.
2.  Specify the appropriate XBM subsystem ID with either the XBMID installation option (see XBMID=) or the XBMID command option.

EXTENDED BUFFER MANAGER (XBM) and SNAPSHOT UPGRADE FEATURE (SUF)

To enable read and write access to your data during check processing, CHECK PLUS uses the snapshot-processing features of XBM or SUF to make a consistent image of the data. CHECK PLUS checks this image while your data remains available.

XBM and SUF are licensed, installed, and maintained separately from CHECK PLUS. You can use either XBM or SUF, depending on the license that you have obtained:

• A license for the full version of the XBM product authorizes you to use both the I/O caching and snapshot-processing features of XBM.
• A license for SUF authorizes you to use only the snapshot-processing features of XBM.

For detailed information about XBM and SUF, see SNAPSHOT UPGRADE FEATURE for DB2 documentation.