On 30 Oct 2007 11:30:25 -0700, in bit.listserv.ibm-main you wrote: >>But why should a program care about block size? >> > >Funny you should ask this; We had a major project implement a couple weeks >ago. To deal with the number of object moves, many of the libraries were just >cloned and renamed at implementation time. During this, a couple pretty >important PDS's were reblocked. A pretty benign change from my point of view. > >It turns out a program update process allocates one of these PDS's >SHR,BLKSIZE=3200. This effectively reblocked the PDS. Every member in this >PDS that was longer than about 40 lines was corrupted and innaccessible. > >That's a reason to care, but probably not the point trying to be made. There >are code bombs waiting to explode. Even a seemingly benign change can >trigger one.
It is absolutely a reason to care - and to demand that the Operating System do the work. It's like having Java do housekeeping - in today's society memory leaks cost more than the overhead of having the system do the work. And we also find it cost effective to put privilege checks into the database instead of the programs. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
