
Defining the JOBQ BIM-EPIC System Datasets
2-24 BIM-EPIC Installation and System Guide
Defining the JOBQ
If the JOBQ will reside in the DSN Catalog (the default), include the JOBQ size requirements
in the overall DSN Catalog size requirements when planning the size of the DSN Catalog.
When the JOBQ is a separate file, the JOBQ is not affected by, and does not affect, activity in
the DSN Catalog. If you create the JOBQ as a separate file, it cannot be shared with any
other CPU (each CPU must have its own unique JOBQ).
In single CPU environments, improved BIM-EPIC performance is the only reason to create
the JOBQ as a separate file.
In multiple CPU environments (Real, LPAR, or VM Guests), if the BIM-EPIC Catalog is
shared, a separate JOBQ file MUST be used for each CPU.
BIM-EPIC does not use VSE’s “device-reserve” or “external-lock” facilities when accessing
the separate JOBQ in a multiple-CPU environment. However, BIM-EPIC must use these VSE
facilities to ensure the integrity of the DSN Catalog when the DSN Catalog is shared in a
multiple-CPU environment.
To determine the size requirements for the JOBQ, first calculate the total number of records as
follows:
• Two records per partition
• One record for every dataset flagged for purge
•
One record for every BIM-EPIC DD statement that uses a dataset name longer than 17
characters
• One record for every BIM-EPIC DD statement that uses a refer-back
• One record for every Common Work Dataset (CWDS) extent
If the JOBQ will reside in the DSN Catalog (the default), add the total number of JOBQ
records to the other DSN Catalog requirements. If the JOBQ will be a separate file, use the
formulas above to determine the space required for a separate JOBQ.
Please see the User Referencefor descriptions of BIM-EPIC DD statements and Common
Work Datasets (CWDS).
A VSE/ESA virtual disk or other high-speed disk is recommended for a separate JOBQ.
Specify the DLBL name in the JQNAME configuration option
It is not necessary to format a separate JOBQ. BIM-EPIC formats it at start-up.
Description
Space
Requirements
Placement
Considerations
Configuration
Options
Formatting the
JOBQ
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