I'm not sure what ISPF does as far as indexing sequence numbers. For other applications, the devil is in the detail. There are various cases where the initialization to determine or store TTRs is noise compared to read time. I had one application where the data changed twice a year. Storing TTRs in the records twice a year is a negligible amount of time. BDAM or ISAM would have been overkill.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 עַם יִשְׂרָאֵל חַי ________________________________________ From: IBM Mainframe Assembler List <[email protected]> on behalf of Paul Gilmartin <[email protected]> Sent: Saturday, November 11, 2023 9:36 PM To: [email protected] Subject: Re: Is True Skip-Sequential Processing Possible with RECFM=FB,DSORG=PS? On Sun, 12 Nov 2023 02:24:50 +0000, Seymour J Metz wrote: >It doesn't have to be FBS if you know the location of the block. > Doesn't ISPF BROWSE do something of that sort, creating an index for rapid positioning to a requested record? But it must (except for FBS?) read once to build the index. On Sun, 12 Nov 2023 02:21:26 +0000, Seymour J Metz wrote: >Are you a betting man? > what's your proposition? -- gil
