If, as seems likely, you are going to read a significant number of members from the same PDS[E], then the DESERV macro is likely to yield better performance (and a simpler program) than BLDL either above or under the covers. This would also be the case if you had occasion to read the same member more than once.
Where exactly the breakpoint is I have never tried to find out, but if you need is only for one or two members then one or two simple DCB FINDs are likely to incur less system overhead than the DESERV. I also have some measurements that suggest (without really establishing in a definitive way) that DESERV is better at dealing with a significant concatenation of a number of libraries than BLDL; but I would be more enthusiastic about this result if I had some inkling of why it is the case. John Gilmore, Ashland, MA 01721 - USA ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
