>From the Share session "what's new in DFSMS" under z/OS V1.9 Statement of Direction
VSAM KEYRANGE Attribute • Support for the VSAM KEYRANGE attribute will not be withdrawn as previously stated • No supported release of z/OS allows you to define new VSAM data sets with the KEYRANGE attribute • On modern storage devices, KEYRANGE is generally detrimental to performance. For this reason, IBM recommends that you minimize or eliminate your use of KEYRANGE. • Striped data sets are expected to provide better performance than KEYRANGE, and can be viewed as a good replacement for KEYRANGE data sets. • To detect the KEYRANGE attribute on existing data sets, refer to INFO APAR II13894. • Use the DFSMShsm ARCTOOLS (FINDKRDS) to detect this attribute for data sets migrated with DFSMShsm. Details on how to use this tool are in the DFSMShsm Implementation and Customization Guide (SC35-0418). and VSAM IMBED and REPLICATE Attributes • In a future release of z/OS, when DFSMShsm or DFSMSdss recalls or restores a VSAM data set with either IMBED or REPLICATE attribute or both, the attributes will be removed. • Once recalled or restored, the data sets would no longer have these attributes. Until this enhancement is made available, support for IMBED and REPLICATE will not be withdrawn. • No supported release of z/OS allows you to define new VSAM data sets or catalogs with the IMBED or REPLICATE attributes • Using them for existing data sets can waste DASD space and can often degrade performance, and for this reason, IBM recommends that you stop using these attributes. • For information about how to detect IMBED and REPLICATE attributes on existing data sets and catalogs, refer to INFO APAR II13894. • Tivolitm Advanced Catalog Management for z/OS also has the ability to remove these attributes Regards, Chris Taylor ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
