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APD1
New User
Joined: 18 Feb 2009
Posts: 59
Location: India
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Hi
I know that EDSA is the extended Dynamic storage area but waht would be a better technical definition to it ? |
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APD1
New User
Joined: 18 Feb 2009
Posts: 59
Location: India
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| I mean I need a better detail explaination |
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enrico-sorichetti
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Joined: 14 Mar 2007
Posts: 10873
Location: italy
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Robert Sample
Global Moderator
Joined: 06 Jun 2008
Posts: 8697
Location: Dubuque, Iowa, USA
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Googling "CICS EDSA" rapidly leads to ...
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The dynamic storage areas
The dynamic storage areas are used to supply CICS® tasks with the storage needed to execute your transactions. From the storage size that you specify on the DSALIM and the EDSALIM parameters, CICS allocates the dynamic storage areas above and below the line respectively.
Too small a dynamic storage area results in increased program compression or, more seriously, SOS (short on storage) conditions, or even storage deadlock abends when program compression is not sufficient.
DSAs consist of one or more extents. An extent below the line is 256KB and above the line, 1MB (except UDSA with TRANISO active, when the extent is 1M).
CICS GETMAIN requests for dynamic storage are satisfied from one of the following: the CDSA, UDSA, SDSA, ECDSA, , EUDSA, or the ESDSA during normal execution. The sizes of the dynamic storage areas are defined at CICS initialization, but the use of storage within them is very dynamic.
The dynamic storage areas consist of a whole number of virtual storage pages allocated from a number of MVS™ storage subpools. CICS uses about 180 storage subpools, which are located in the dynamic storage areas. For a list of the subpools see the tables in topics Table 255 through Table 260. Each dynamic storage area has it own "storage cushion" These subpools (including the cushion) are dynamically acquired, as needed, a page at a time, from within the dynamic storage area. |
The "estended" means above the line. |
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Earl Haigh
Active User
Joined: 25 Jul 2006
Posts: 475
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| This sounds like another interview question. |
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APD1
New User
Joined: 18 Feb 2009
Posts: 59
Location: India
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| Thanks for the explainations .....it was not a an interview questions.......it is a leraner's question who is pretty new to the world of CICS.....thanks again |
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