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

IBM CICS Interface for Teradata® Reference - 20.00

Deployment
VantageCloud
VantageCore
Edition
Enterprise
IntelliFlex
Lake
VMware
Product
IBM CICS Interface for Teradata
Release Number
20.00
Published
October 2023
Language
English (United States)
Last Update
2024-03-18
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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 lesser than 16 MB line.

    Therefore, large numbers for MAX can result in virtual storage impact lesser than the line.

  • For CICS release CICS/ESA 3.2 and later, the free chain is only used for blocks that are that are more than the 16 MB line.

    The response buffers for AMODE 24 applications may be lesser than the line.

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