> -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:[email protected]] On Behalf Of R.S. > Sent: Monday, August 10, 2009 11:41 AM > To: [email protected] > Subject: Re: DASD: to share or not to share <snip> > > In fact VSAM datasets are safe as long as an application respects > shareoptions. For PS datasets - there is no system-supported way to > share it within single image (EXCEPT DISP=SHR), however it is > worth to > mention that there is no GRS ENQ. That means the ENQ is not > visible on > another system.
Enhanced Data Integrity, http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/DGT2DI30/4.4 <quote> Enhanced data integrity prevents accidental data loss when concurrent users are writing to a shared sequential data set. </quote> http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/DGT2D470/3.4.1 <quote> You can concurrently access a shared sequential data set for output or update processing. In some cases, you can lose or destroy data when you update the data set, because one user could, at the same time, overwrite another user's updates. The enhanced data integrity function prevents this type of data loss. This data integrity function either ends the program that is opening a sequential data set that is already opened for writing, or it writes only a warning message but allows the data set to open. Only sequential data sets can use the enhanced data integrity function. </quote> > > -- > Radoslaw Skorupka > Lodz, Poland John McKown Systems Engineer IV IT Administrative Services Group HealthMarkets(r) 9151 Boulevard 26 * N. Richland Hills * TX 76010 (817) 255-3225 phone * (817)-961-6183 cell [email protected] * www.HealthMarkets.com Confidentiality Notice: This e-mail message may contain confidential or proprietary information. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. HealthMarkets(r) is the brand name for products underwritten and issued by the insurance subsidiaries of HealthMarkets, Inc. -The Chesapeake Life Insurance Company(r), Mid-West National Life Insurance Company of TennesseeSM and The MEGA Life and Health Insurance Company.SM ---------------------------------------------------------------------- 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
