IAM Release 09.03.02 SPIN=10 added enhanced reorganization processing for IAM Extended Format Data Sets. The goal of these enhancements is to provide increased data availability for IAM data sets by reducing the time that the data is not available due to data set reorganizations. See Dynamic Reorganization of IAM Data Sets on the FDR website for more details. The new functions and features included with this enhancement are:
Dynamic Reorganization process to perform the bulk of the reorganization process while the IAM data set remains completely available to CICS online transaction processing.
Employs various techniques to enhance the performance of the reorganization process with use of the latest IBM Z features including 64-bit storage, z/Architecture instructions, and z/HPF I/O. Unlike typical reorganizations, that use an intermediary flat file, the data is written directly into a new IAM data set. An optional flat file copy of the data set can be concurrently created by this process for backup purposes and optional use of z/EDC to reduce the size.
Eliminate the need to decompress and compress data for data sets that use any form of IAM data compression. While that has been available for IAM software compressed files, this is a new feature for hardware compressed files. This is a very significant improvement in both CPU time and clock time to reorganize hardware compressed IAM data sets.
Export and Import functions are available that create a flat file image of the IAM data set that has the compressed data, the file attributes for subsequent import, and the hardware compression dictionary for the data set if applicable. This is an excellent alternative to using IDCAMS REPRO for application data set backups. The exported data set can be compressed with z/EDC to further reduce the amount of space needed for the backup copy.
See Chapter 43 in the IAM Release 09.00.02 SPIN 10 User Manual for more details.
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