On Mon, 21 Apr 2014 09:09:37 -0700, Ed Jaffe wrote: >On 4/21/2014 7:59 AM, Joel C. Ewing wrote: >> DB2 required greater flexibility and control to achieve its performance >> and data consistency goals than was possible with VSAM keyed-access >> support. A very cursory look at "Experiences Installing Oracle >> Database 10g on z/OS" would suggest Oracle on z/OS makes use of VSAM LDS >> for table storage as well. > >As does zFS. > What do PDSE and the (obsolescent) HFS use? I believe they're both called DSORG=PO, for PDSE for the objective of application compatibility, but doing so strains the older notion of DSORG; the physical organization of either is vastly different from the classic DSORG=PO, more like an emulated emulated FBA, isn't it?
And I know that some RDB implementations on UNIX systems (optionally) bypass UNIX file I/O and do low-level disk operations in the interest of performance. Does VSAM LDS meet these performance criteria? What about paging and JES? Do both antedate VSAM LDS? What do they do? -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
