Analyzing the DEDB during an extend

If your site has a license for the Fast Path Online Analyzer/EP product, pointer validation will occur automatically (by default) when you execute an online extend.

This automatic process applies the default value QUICK for the POINTER_VALIDATION keyword. The analysis function performs a checksum validation of pointers for each area of the database that is specified on the EXTEND command. Automatic pointer validation provides assurance of the area’s pointer integrity, while providing statistics that show how the extend process affected space usage.

Note

You can override automatic quick pointer validation and request more detailed validation by specifying POINTER_VALIDATION=FULL on the EXTEND or GLOBAL command. Direct pointers are validated by using the cross-reference technique. Although not recommended, you can also specify another valid value for the POINTER_VALIDATION keyword (such as POINTER_VALIDATION=NONE) to completely disable the analysis function).

You can manually specify any valid value for the SDEP_VALIDATION keyword to control how SDEP pointers are to be validated.

You can also specify additional functions that are associated with the analysis function:

  • Use the RAP_VALIDATION keyword to control how RAPs are processed.

  • Use the LARGEST_DATABASE_RECORDS keyword to specify the number of largest database records to be tracked by the analysis process.

  • Use the REPORT and THRESHOLD subcommands to control the generation of analysis reports and exception testing.

For more information about these keywords and subcommands, see Analyzing a DEDB online.

Because no values are specified for the POINTER_VALIDATION and SDEP_VALIDATION keywords, the following example requests that pointer validation be performed during the extension of the area by using the quick (checksum) technique and that no validation of SDEP pointers is performed. Full validation for RAP pointers is requested explicitly. The example produces only the Free Space Analysis report and does not check threshold conditions.

Control statements for requesting analysis during an extend

EXTEND DBD=<dbdname>,EXTEND_SDEP=(Control_INTERVALS,100)RAP_VALIDATION=XREF
  REPORT 
    REPORT_DEFAULT=NO,
    FREESPACE_ANALYSIS=YES




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