5. Maintenance › 5.14 Vertical Checkpoint Expansion

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5.14 Vertical Checkpoint Expansion


Review your CA MICS configuration and if you still need to
increase the checkpoint size, then complete the checklist
below.

Note:  This procedure assumes you have already completed all
       installation processing for this unit database and
       that the database is populated with valid data.
__  1.  Backup Checkpoint Data Set

        Run a BACKUP operational job to backup all of your
        databases, especially your checkpoint data set.

__  2.  COPY Checkpoint Data Set

        Manually copy the prefix.MICS.CHECKPT.DATA data set.
__  3.  Modify CKPTCNT Parameter

        Modify the CKPTCNT parameter in
        prefix.MICS.PARMS(SITE).  CKPTCNT must be a number
        between 100 and 9999.  Specify no more checkpoint
        entries than you will reasonably need.

        NOTE: A good rule of thumb is to set checkpoint size
        to twice the size of the original checkpoint.  For
        example, if your original CKPTCNT specification is
        100, then 200 is a reasonable size for your enlarged
        checkpoint.  If you run out of checkpoint entries at
        200, then try expanding the checkpoint size to 400
        entries.  Remember that the maximum checkpoint size
        is 9999.
__  4.  Execute BASPGEN

        Execute the job in prefix.MICS.CNTL(BASPGEN) to
        validate your CKPTCNT specification and generate the
        %CKPTCNT macro for the unit database.
__  5.  Execute CKPTINIT

        Execute the following job to resize your checkpoint
        data set:

           'prefix.MICS.CNTL(CKPTINIT)'
__  6.  Resume Operations

        Resume normal operational job processing.