Parallel unload for migration to HALDB

If you are migrating a large database to HALDB, you can improve unload performance by running the HD Unload Utility (DFSURGU0) in multiple parallel jobs, with each job unloading a specified key range of database records.

Unloading a key range of database records is supported only when the MIGRATE=YES option is used.

To further improve migration performance, unload a key range for a single partition in one step followed by a migration reload of the corresponding HALDB partition.

The migration reload must use DBRC=Y and requires that the RECON data sets that contain the new HALDB partition definitions be allocated either with JCL or, for dynamic allocation, with DBRC RECON MDA members.