CSCAN command

The CSCAN command collects information about the catalog structures and writes (offloads) the performance statistics maintained in real-time by the Catalog Scan performance facility.

When you issue the CSCAN command with no keywords, it collects information about the catalog structures and offloads the performance statistics. Specify the CSCAN command with the optional PERF=ONLY keyword to only offload the performance statistics.

Note

The SVCPF component must be active to offload performance statistics. The SVCPF component does not have to be active for the CSCAN command to collect catalog structure information.

You can issue the CSCAN command manually or by time-driven rules in the MainView SRM Scheduled Services facility. The distributed scheduled services definition (SMSCHD00) contains a sample definition for a CSCAN interval.

CSCAN command format

CSCAN
PERF=NO/N/YES/Y/ONLY/O/INTEND/I

CSCAN command keyword

Command keyword	Description and values
PERF=	Specifies whether to offload performance statistics to the CSCAN output collection data set YES or Y collects information on the catalog structure and offloads the performance statistics (default). If the PERF keyword is not specified, the performance statistics will be offloaded. NO or N collects information on the catalog structure but does not offload the performance statistics. Any performance statistics currently on the output CSCAN data set are kept. ONLY or O offloads the performance statistics but does not collect information on the catalog structure. Specifying this keyword value updates (rather than overwrites) the CSCAN collection data set. INTEND or I offloads the performance statistics only, the same as specifying PERF=ONLY, and forces the end of the interval defined by the CSCAN_PERFI= SMMSYS keyword. This keyword can be used when changes could impact catalog response times. Issuing a CSCAN with PERF=INTEND moves the current interval to the prior interval and starts a new current interval.

Command keyword

Description and values

PERF=

Specifies whether to offload performance statistics to the CSCAN output collection data set

YES or Y collects information on the catalog structure and offloads the performance statistics (default).
If the PERF keyword is not specified, the performance statistics will be offloaded.
NO or N collects information on the catalog structure but does not offload the performance statistics. Any performance statistics currently on the output CSCAN data set are kept.
ONLY or O offloads the performance statistics but does not collect information on the catalog structure.
Specifying this keyword value updates (rather than overwrites) the CSCAN collection data set.
INTEND or I offloads the performance statistics only, the same as specifying PERF=ONLY, and forces the end of the interval defined by the CSCAN_PERFI= SMMSYS keyword.
This keyword can be used when changes could impact catalog response times. Issuing a CSCAN with PERF=INTEND moves the current interval to the prior interval and starts a new current interval.

In the SVOS JESLOG, message SVO5082I indicates that the CSCAN process has started; SVO5083I indicates process completion.

CSCAN command

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