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an MQSeries termination, and automatic resource resynchronization
after a restart.
The CICS adapter is supplied with MQSeries as the CICS transaction CKQC.
9.5.1.4 Data Sets
MQSeries for VSE/ESA uses the following data sets:
•
the System Setup file: a VSAM ESDS file containing system setup
information. It is only used once to initialize the System Configuration file.
•
the System Configuration file: a VSAM KSDS file. It initially contains system
definitions, messages, names of MQSeries maps and programs and so on. It
will be updated whenever the user defines additional MQSeries objects such
as queues and channels.
•
Queue data sets: VSAM KSDS files to hold messages.
MQSeries for MVS/ESA uses the following data sets:
•
Page sets to store messages and definitions.
A page set is a linear VSAM data set that has been formatted for use by
MQSeries for MVS/ESA. Each page set is identified by a page set ID (PSID),
an integer in the range 00 through 99. In particular, MQSeries for MVS/ESA
uses page set 00 to store queue definitions and other important information
relevant to the queue manager.
•
Log data sets to log data and events.
MQSeries for MVS/ESA records all persistent messages in the active log.
When the active log is full, MQSeries for MVS/ESA switches to the next
available log data set. Each active log data set is a single-volume,
single-extent VSAM entry-sequenced data set (ESDS).
If archiving has been switched on during customization, MQSeries for
MVSE/ESA copies the contents of a full active log to an archive log when it
switches logs. The archive logs can be a data set on a direct access storage
device (DASD) or on magnetic tape. The archive log consists of up to 1000
sequential data sets. Each data set can be cataloged using the Integrated
Catalog Facility (ICF).
MQSeries for MVS/ESA allows you to have either single logging or dual
logging.
•
The boot strap data set is a VSAM key-sequenced data set (KSDS) that holds
information needed by MQSeries for MVS/ESA. It contains an inventory of all
active and archived log data sets known to MQSeries for MVS/ESA.
No migration of the data sets used by MQSeries for VSE/ESA to those used by
MQSeries for MVS/ESA is supported.
To set up MQSeries for MVS/ESA you need to define and populate the required
data set from scratch.
You can use the information on the size of your VSE/ESA data sets to estimate
the space required under OS/390.
No facility exists to move messages from a VSE/ESA queue to a queue under
OS/390. Therefore, you should make sure that all your queue entries have been
processed under VSE/ESA before you switch to the OS/390 system.
202 VSE to OS/390 Migration Workbook