How partitions can be unloaded and reloaded in parallel

In some situations, the REORG utility attempts to unload and reload partitions in parallel. In other situations, parallel unloading and reloading does not occur.

REORG attempts to unload and reload table space partitions in parallel in the following situations:

  • If you specify the NOSYSREC keyword.
  • If the NOSYSREC keyword is defaulted like it is for SHRLEVEL CHANGE
  • If you specify the UNLDDN keyword with a template name, where the template's data set name pattern includes a partition number.

REORG does not attempt to unload and reload table space partitions in parallel in the following situations:

  • If the DATAWKnn DD statements are coded in the JCL.
  • If you do not specify the SORTDEVT keyword.
  • If the UTPRINT data set is not allocated to SYSOUT.
  • If you specify the REBALANCE keyword.
  • If rows might move from one partition to another as a result of alter limit keys or partition-by-growth table space.
  • If you specify the UNLDDN keyword with a template name and specify UNIT(TAPE) STACK(YES).).
  • When the number of subtasks that are started in parallel exceeds the value of the PARALLEL option or the PARAMDEG_UTIL subsystem parameter.