Calculating storage requirements with the installation CLIST

By providing information about the sizes of your Db2 environment, you can use the installation CLIST to calculate certain storage requirements for your Db2 subsystem.

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Before you begin

For information about increased EDM storage requirements in Db2 12, see Increased EDM storage usage for DBDs (in Storage release incompatibilities).

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About this task

The CLIST contains the algorithms that Db2 uses to calculate storage based on the parameters that you supply during installation or migration.

Procedure

  1. Run the installation CLIST, as described in Generating tailored Db2 12 installation, migration, or function level activation jobs.
  2. In the INSTALL TYPE field on panel DSNTIPA1, specify INSTALL.
    If you specify MIGRATE for the INSTALL TYPE field, Db2 12 uses values from Db2 11 instead of running the CLIST calculations.
  3. On panel DSNTIPD, specify field values that describe the size of your Db2 environment.
    Specify integer values, not fractions. You can use K (as in 32 K) for multiples of 1024 bytes and M (as in 16 M) for multiples of 1,048,576 bytes in most fields. do not exceed the maximum value that is accepted by the field.

    The CLIST uses the values that you specify to calculate storage requirements. You can see the calculation results on the fields of the CLIST calculations panel: DSNTIPC.

  4. On panel DSNTIPC, specify whether to accept the calculated values.
    The Override column of panel DSNTIPC controls whether Db2 uses the calculated value:
    • To accept the calculated value, ensure that the Override column contains no value.
    • To override the calculated value, specify a value in the Override column.

What to do next

If you want to examine the algorithms that Db2 uses for the CLIST calculations, that Db2 uses, print or edit the installation CLIST and REXX EXEC. The DSNTCALC EXEC contains most of the data set calculations.