UNLOAD and RELOAD commands

The scenarios in this section show how to use the UNLOAD and RELOAD commands in conjunction with key related keywords and subcommands. Most of these scenarios show both UNLOAD control card input and RELOAD control card input in order to demonstrate the respective JCL requirements that are necessary to successfully execute these processes.

Primary command/scenario task	Subcommand/keyword	Concept/process	Page
UNLOAD/RELOAD Increase Area Space/Size Parameters	IAREA / OAREA AREA DD statements SDEP_PROCESS (on UNLOAD) SORT (on RELOAD) IC (on RELOAD)	Change the size of UOW, RAA, and CI for areas Specify processing for defined SDEPs Request image copy to be taken on reload	Use UNLOAD and RELOAD to increase area size and space parameters
UNLOAD/RELOAD Change DEDB Compression	IAREA / OAREA EXPAND (on UNLOAD) COMPRESS (on RELOAD) IC (on RELOAD) SEGM statements from DBD	Apply added/changed compression routines for selected segments based on changed SEGM statements in DBD Expand compressed data using newly defined routines Request image copy to be taken on reload	Use UNLOAD and RELOAD to change compression
UNLOAD/RELOAD Increase Number of Areas Initialize New Fields in Segments	IAREA / OAREA INPUT_DSN_MASK OUTPUT_DSN_MASK OUTPUT SEGMENT FIELDS POINTER_VALIDATION EXPAND (on RELOAD) SDEP_PROCESS IC	Request image copy to be taken on reload Specify allocation parameters for image copy Increase segment length for specified segments Expand compressed segments Request NO pointer validation on reload Dynamically allocate input and output data sets Specify processing for defined SDEPs	Increase number of areas and initialize new fields in segments
UNLOAD/RELOAD Create a Test Database with a Subset of Data	INPUT_DSN_MASK INCLUDE SEGMENT SAMPLE_LIMIT SAMPLE_INTERVAL OFILECTL SDEP_PROCESS ERROR_THRESHOLD	Dynamic allocation of input areas Include sampling of root segments of interval and limit criteria Specify processing for defined SDEPs Define and dynamically allocate output files	Create a test database with a subset of data
UNLOAD/RELOAD Unload and Reload a DEDB Add (Build) Associated Indexes During Reload	INPUT_DSN_MASK SDEP_PROCESS OUTPUT_DSN_MASK OFILECTL IX with INDEX IC	Dynamic allocation of input and output areas Specify processing for defined SDEPs Define output unload file Add (build) multiple associated indexes during reload process	Unload and reload a DEDB and add (build) associated indexes during reload
UNLOAD/RELOAD Unload DEDB, Use FABEUR6 and FABEUR7 Utilities to Change Segment Data, then Reload DEDB	SDEP_PROCESS OFILECTL with OAREA IC with STACK_NAME	Specify processing for defined SDEPs Write all unloaded areas to one output file Use FABEUR6/7 utilities to make changes to segment data Create stacked image copy for each reloaded area	Unload DEDB and use FABEUR6 and FABEUR7 utilities to change segment data then reload DEDB
RELOAD Define Different Space Allocations for Reload Output Areas	ALLOCATE with OAREA ACTUATE SPACE / VOLSER	Define allocation for multiple output areas Define different space allocation for each output area	Define different space allocations for reload output areas

Related topic

Sample command scenarios

UNLOAD and RELOAD commands

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