I have been reading the z/OS V1.7 to V1.9 Migration guide and though it states you do not need to remove IMBED, REPLCIATE or KEYRANGE. It does mention that there is a performance issue by having them on your VSAM files.
I was wondering if anyone did an analysis to see what the buy back for VSAM response was if these are removed? It would help me build a case to get the VSAM data sets reorged more quickly. My VSAM seems to be strictly IMBED at this time. I did not find any KEYRANGE or REPLICATE definitions. Redefine existing VSAM data sets that contain the IMBED, REPLICATE, and KEYRANGE attributes Description: No supported release of z/OS honors the IMBED, REPLICATE, and KEYRANGE attributes for new VSAM data sets. In fact, using these attributes can waste DASD space and often degrades performance. Servicing these VSAM data sets has become increasingly difficult. In some cases, unplanned outages have occurred. For these reasons, IBM recommends that you stop using IMBED and REPLICATE, and that you minimize or eliminate your use of KEYRANGE. IMBED and REPLICATE were intended as performance improvements and have been obsoleted by newer, cached DASD devices. Striped data sets provide much better performance than KEYRANGE and should be viewed as a candidate for any existing KEYRANGE data sets. Is the migration action required? No, but recommended to avoid degraded performance and wasted DASD space. Any comments are always welcomed. Lizette ---------------------------------------------------------------------- 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
