Job Management Partner 1/Automatic Job Management System 3 - Web Operation Assistant Description, Operator's Guide and Reference

Appendix E.3 Estimating the Global Buffer

Organization of this subsection

(1) Estimating the number of global buffers

(2) Estimating shared memory requirements

(1) Estimating the number of global buffers

Use the following equation to estimate the number of global buffers to set for an embedded database or HiRDB.

Number of buffers = x * 1520 / 100000 + y

x: number of records of the table which is in the unit status (AJSSTAT)

y: number of global buffers before changes

Set the estimated maximum number of records based on operation conditions for the number of records of the table which is in the unit status (AJSSTAT).

The number of records necessary for each registered root jobnet is (root-jobnet-and-total-number-of-nested-jobnets-and-jobs-within) * (number-of-logs-to-keep + number-of-generations-registered-for-fixed-execution + 1), where the number of logs to keep includes subgenerations created when start conditions are satisfied.

(2) Estimating shared memory requirements

When the global buffer is expanded, shared memory requirements increase.

Use the following equation to estimate the increased amount of shared memory requirements.

Increase in shared memory = (x - y) * 6516 / 1520 [kilobytes]

x: number of global buffers after changes

y: number of global buffers before changes

The maximum size of the shared memory segment for the global buffer used by the embedded database or HiRDB is set in the SHMMAX operands of the system common definitions.

Add the value of the increase in shared memory requirements calculated from the above estimate to the setting value for the SHMMAX operands.

For details about the SHMMAX operands, see the related manual.

For the embedded database:

If you are using the version 08-00 or later of JP1/AJS2 - Manager, see the manual Job Management Partner 1/Automatic Job Management System 2 Planning and Administration Guide for more information. If you are using the version -07-50 or earlier, see the manual Job Management Partner 1 Embedded Database Operator's Guide for more information.

For HiRDB:

See the manual of the HiRDB you are using for more information.

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