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Mapper Purge

Mapper Purge

Mapper Purge

Hi is there any body who could help with this, or indeed explain what it means? Basically I am getting Command rejects During (CM-REJ)a MAPPER PURGE ON a bunch of StorageTek 9840 DRIVES all in the same frame, attached to a 9310 Silo.(Repeated CM-REJs occur during MAPPER PURGE operation.As a result the Purge operation had to keep being restarted due to CM-REJs.)

What is a Mapper purge? Something to do with Unisys?
What is a CM-REJ?
What is a Channel program?
What is a CDB?


RE: Mapper Purge

In the end this was a code issue

RE: Mapper Purge

A MAPPER purge is actually creating a backup.
Why the folks at Unisys (formerly Sperry UNIVAC) chose the word purge (delete) has something to do with updates that are applied to reports are put into a temporary database area and at somepoint those updates need to be made permanent or purged. On the Unisys 2200 (now called ClearPath IX) mainframe, selected drawers can have their own temporary database area for updates. Some drawers can have updates made permananet, other drawers can have their updates not made permanent. Until the updates are applied these updates are on what is called a PURGE tape (or disk area). If some or all of the drawers do not have their updates applied permanently, then incense the updates were purged. This covers where purge comes from. The task called PRSTR (pree-ster) also is common task with the PURGE task.

In the Open MAPPER relm (MAPPER-C for UNIX-like-OS/Linux, MAPPER-NT for Windows) the process of backing up used the nomenclature from the mainframe but is a very different task. The Open MAPPER did not keep updates in a separate database area because updates were applied immediately.
Purge in Open MAPPER creates a file on UNIX or Windows containing a backup.

In Open MAPPER, if you create a purge file (backup) containing some database areas (reports, drawers, and cabinets), then lets say you do some updates to the live database, if necessary you can easily back those updates out by merely APPLOADing the older data sitting in the backup file, thus you purged the updates.

So purge makes sense in some ways. Perhaps a the words BACKUP and RESTORE would make better sense; since they have PURGE and PRSTR in mainframe - for UNIX-Linux-Windows they could use BKSTR (Baxster).

MAPPER - Managing And PreParing Executive Reports,
is now called BIS - Business Information Server.

Sorry I don't know the other terms.

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