We use it for datasets allocated to SYSUDUMP etc. It allocates 0 tracks until the moment a dump has to be written, if any.
Kees. "Ron Hawkins" <[email protected]> wrote in message news:<[email protected]>... > Radoslaw, > > Infrequent but not illogical. > > I've used it for datasets that are only opened and written to on a weekly or > monthly basis. The secondary extents are allocated and used when anything is > written. > > You will also find empty datasets with space released to zero tracks. This > is one of the effects of having a HWM written to an empty dataset. If it is > logical at space release, why wouldn't it be logical at allocation? It's net > same result. > > Ron > > > -----Original Message----- > > From: IBM Mainframe Discussion List [mailto:[email protected]] > > On Behalf Of R.S. > > Sent: Monday, August 27, 2012 3:34 PM > > To: [email protected] > > Subject: Re: [IBM-MAIN] Space Allocation In Bytes > > > > W dniu 2012-08-25 17:49, Skip Robinson pisze: > > > Zero space allocation is perfectly valid. > > > > Valid, but illogical. Data set with zero size is illogical. > > > > > As is SPACE (0,1) also. The > > > result is just as requested. In either case, the data set exists in > > > the VTOC but takes up no space on disk. The data set is treated as > > > 'real', including GRS enqueue. Hence it can be used like any other > > > exclusively held data set to serialize execution. > > That's exploitation of "side effect". Stilla valid (it works, so it is > valid), but it's > > still illogical. > > > > > > -- > > Radoslaw Skorupka > > Lodz, Poland > > > > > > > > > > > > > > -- > > Tre tej wiadomoci moe zawiera informacje prawnie chronione Banku > > przeznaczone wycznie do uytku subowego adresata. Odbiorc moe > > by jedynie jej adresat z wyczeniem dostpu osób trzecich. 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