Block update command for a RACF database (BLKUPD)

You can use BLKUPD to examine or modify any block in a RACF® database: a data block, index block, BAM block, or deallocated block.

To use BLKUPD, you must have at least UPDATE authority to the RACF database.

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Before using the BLKUPD command, you should be familiar with the RACF database and its configuration, because using BLKUPD improperly can damage the RACF database. (See Format of the RACF database.)

Before entering the BLKUPD command, you should read and understand the format of the database. Then, before using the BLKUPD command to perform updates to your RACF database, try to use one of the other RACF commands to alter or delete the entry in question.

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This describes the following topics:
  • Considerations when using the BLKUPD command
  • Hierarchy and uses of the BLKUPD command
  • Examples
Parent topic: Format of the RACF database