Calculating IMS data space

Two tables are used to store IMS™ data.

About this task

Collect IMS data as follows:
  1. Estimate the number of application programs that are used in the CICS® region that use DLI calls. Call this number NUM_IMS_PROG.
  2. Estimate the average number of EXEC DLI calls per program. Call this number AVG_IMS.
  3. Estimate the number of transaction and program associations. In this example, the estimate is that each can be associated with five transactions.
  4. Calculate IMS data space as follows:
    (75 * NUM_IMS_PROG * AVG_IMS * PROG_TRAN_RATIO) + 
    (20 * NUM_IMS_PROG * AVG_IMS * PROG_TRAN_RATIO) = IMS_DS bytes.

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Timestamp icon Last updated: Friday, 7 February 2014


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