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John Sears once explained that one of reasons IBM went with SLS on the S/38 was to be able to take advantage of new storage technologies that were promising at the time ( bubble memory ). Had bubble memory not been the big bust it was, DASD could have become obsolete. ----- Original Message ----- From: "DeLong, Eric" <EDeLong@xxxxxxxxxxxxxxx> > Regarding buffering and SLS, my understanding of this is that SLS is just a > big memory map that encompases all storage within the box. The fact that a > database file is associated with a particular memory address does not impart > any real performance benefit.... It just makes the management of those > resources simpler. When you access a file that is stored on DASD, the OS > must still copy that data from the device into main storage. From main > storage, then, it gets sent to the application in discreet chunks. Record > blocking sends larger chunks, saving on overhead.
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