The R+/CHANGE ACCUM for Db2 product offers the ability to create new recovery resources. Using these resources with BMC AMI Recover for Db2 (BMC AMI Reorg) can significantly streamline normal and disaster recovery processes. R+/CHANGE ACCUMR+/CHANGE ACCUM extracts and sorts updates from the Db2 log for a designated group of spaces and stores the updates in a file. This file, called a change accumulation file, provides an efficient alternative recovery resource for BMC AMI Reorg to use instead of Db2 log data sets.
R+/CHANGE ACCUM is composed of an interactive ISPF interface and a batch utility. You can use the interface to define and create change accumulation groups.
A change accumulation group can include any number of table spaces, partitions, or data sets, as long as you specify a sufficient amount of REGION on the EXEC statement. The R+/CHANGE ACCUM repository stores the group definitions. You can include the indexes that are associated with table spaces in the change accumulation processing for the group.
You use the R+/CHANGE ACCUM batch utility to generate change accumulation files routinely.
R+/CHANGE ACCUM selects only the log record data that is needed for recovery and prepares records for processing in BMC AMI Reorg.
Consequently, R+/CHANGE ACCUM can enhance the speed at which recovery processes take place.
R+/CHANGE ACCUM offers the following benefits:
Reduces the elapsed time that is required to recover table spaces and, optionally, their associated indexes
Improves predictability because recovery time depends only on the resources needed for the table spaces (and, optionally, their associated indexes that you are recovering)
Limits shared resources, enabling greater concurrency
Increases availability of Db2 data
Reduces the number of tape mounts that are required for a recovery in a data sharing environment