"For example I don't know what is partition in VSE and how it is differ from regular address spaces or just several jobs (in VSE) working with same shared VSAM file."
Think of the flat 16MB address space, on IBM 370. Now think about a machine that has say 512K of RAM in that address space. So, you might partition that 512K as 64K sub "address spaces". The difference is that the partitions are fixed amount of memory. You have x number of foreground partitions (F1-Fx) and 1 background partition (BG). In DOS/VSE, you have 11 foreground partitions (F1-FB) and 1 background partition (BG), for a total of 12 partitions. In z/VSE, you can have up to 200 dynamic partitions in addition to the 12 fixed. VSE uses a system for Job Scheduling called POWER similar to JES2. That always runs in F1, and everything else runs under the control of POWER. Usually VTAM runs in F2, and CICS/ICCF in F3. That leaves F4-FB for work, as well as background (BG). Most batch work is done in BG, and it is usually the largest partition. So, all that to say, when using VSAM on z/VSE, it is possible for multiple partitions to have a VSAM file open for update. That is what shareoption (4) does for you, VSE coordinates the VSAM file access among the multiple partitions... Joe On Sun, Nov 1, 2020 at 6:53 AM R.S. <[email protected]> wrote: > W dniu 31.10.2020 o 00:40, Joe Monk pisze: > > Radoslaw, > > > > He is asking about shareoption (4 x) not (x 4) aka cross-region sharing, > > not cross-system sharing. > > > > In VSE, Shareoption(4) allows vsam file sharing among partitions (similar > > to a z/os address space). VSE manages that automatically, for the user. > > Well, I just learnt something new about VSAM. Thank you. > Actually it is strictly related to z/VSE - this system is unknown for me > (my research told me there were only two installations in Poland). > For example I don't know what is partition in VSE and how it is differ > from regular address spaces or just several jobs (in VSE) working with > same shared VSAM file. > > BTW: Few questions > Where can I read about VSAM SHR (4 x)? > Was SHR (4 x) available on MVS or its predecessor? > Is there any "introduction" of VSE disks usage, datasets, and so called > file system? How is it similar to z/OS? > > > > However, regarding the subject I sustain that migration to Db2 is worth > to analyze. > Of course everything depends on many factors like appliation complexity, > staff availability, MIPS in use, budget, plans for the future, etc. > > -- > Radoslaw Skorupka > Lodz, Poland > > > > > > ====================================================================== > > Jeśli nie jesteś adresatem tej wiadomości: > > - powiadom nas o tym w mailu zwrotnym (dziękujemy!), > - usuń trwale tę wiadomość (i wszystkie kopie, które wydrukowałeś lub > zapisałeś na dysku). > Wiadomość ta może zawierać chronione prawem informacje, które może > wykorzystać tylko adresat.Przypominamy, że każdy, kto rozpowszechnia > (kopiuje, rozprowadza) tę wiadomość lub podejmuje podobne działania, > narusza prawo i może podlegać karze. > > mBank S.A. z siedzibą w Warszawie, ul. Senatorska 18, 00-950 Warszawa, > www.mBank.pl, e-mail: [email protected]. Sąd Rejonowy dla m. st. Warszawy > XII Wydział Gospodarczy Krajowego Rejestru Sądowego, KRS 0000025237, NIP: > 526-021-50-88. Kapitał zakładowy (opłacony w całości) według stanu na > 01.01.2020 r. wynosi 169.401.468 złotych. > > If you are not the addressee of this message: > > - let us know by replying to this e-mail (thank you!), > - delete this message permanently (including all the copies which you have > printed out or saved). > This message may contain legally protected information, which may be used > exclusively by the addressee.Please be reminded that anyone who > disseminates (copies, distributes) this message or takes any similar > action, violates the law and may be penalised. > > mBank S.A. with its registered office in Warsaw, ul. Senatorska 18, 00-950 > Warszawa,www.mBank.pl, e-mail: [email protected]. District Court for the > Capital City of Warsaw, 12th Commercial Division of the National Court > Register, KRS 0000025237, NIP: 526-021-50-88. Fully paid-up share capital > amounting to PLN 169.401.468 as at 1 January 2020. > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
