CDC Guide for z/OS

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Changing CDC Override Options for VSAM Data Sets

You can change the CDC override options in the

//EDMKOVRD DD

statement in the CICS startup JCL or in the data set to which the DD statement points while the CICS/VSAM ECCR is active.

For example, you might want to enable or disable change data for a VSAM data set type or a specific data set.

For KSDS and RRDS data sets and CICS-maintained tables, change data capture is enabled by default. You can disable change data capture for any of these source types, even if data sets of the specified type are registered for CDC, by specifying OFF for the following options:

CAPTURE_KSDS

CAPTURE_RRDS

CAPTURE_CMDT

For ESDS data sets, change data capture is disabled by default. To enable change data capture for ESDS data sets, you must specify CAPTURE_ESDS=ON. You can also customize ECCR handling of backouts for ESDS data sets by specifying the optional BACKOUTRC and ESDSFAIL override options.

For a specific VSAM data set, you can use the DSN option to enable or disable change data capture or override the default backout handling.

For more information about all of these options, see Configuring CICS for CDC.

After you change CDC override options, issue the EDMC REFRESH command to validate the syntax. If syntax errors are reported, correct them.

Then issue the EDMC RESTART command to re-initialize the CICS/VSAM ECCR so that the ECCR can start using the updated CDC override options.

After you issue the RESTART command, the CICS/VSAM ECCR will be momentarily inactive between ECCR termination and re-initialization. If you issue the command during a period of high file I/O activity, the ECCR might miss some change data, which can damage data integrity.

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CDC Guide for z/OS

CDC Guide for z/OS

Changing CDC Override Options for VSAM Data Sets

Changing CDC Override Options for VSAM Data Sets