DMEM Command: Some Usage Notes - IBM CICS Interface for Teradata

IBM CICS Interface for Teradata Reference

Product
IBM CICS Interface for Teradata
Release Number
15.10
Language
English (United States)
Last Update
2018-10-07
dita:id
B035-2448
lifecycle
previous
Product Category
Teradata Tools and Utilities

When you use the DMEM command transit, remember the following:

  • The DMEM counters are stable for the life of CICS.
  • This means that the counts and the free chain contents are maintained across DBCC restarts.

  • Free blocks of storage are not pre‑allocated during DBCC initialization.
  • This means that the MIN column is not significant.

    Blocks are placed on the free chain when released if the sum of #FRE plus ALOC is less than MAX.

    All storage used by CLI is shared storage and is not accounted for under the TCA of the requesting application.

  • For CICS releases prior to CICS/ESA 3.2, all memory used is below the 16 MB line.
  • Therefore, large numbers for MAX can result in virtual storage impact below the line.

  • For CICS release CICS/ESA 3.2 and above, the free chain is only used for blocks that are above the 16 MB line.
  • The response buffers for AMODE 24 applications may be below the line.

    For these, use of the free chain will be bypassed, but the DMEM counter will be updated.