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CICS dynamically allocates LSRPOOLs??

 
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rakeshreddy
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Joined: 21 Mar 2007
Posts: 28
Location: Bangalore

PostPosted: Fri Nov 20, 2009 8:28 pm    Post subject: CICS dynamically allocates LSRPOOLs??
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Hi,

My questions are about LSRPOOL.

1) Can any one explain me the Differance between "Allowing CICS to build LSRpools Dynamically" AND " Defining LSRpools in CSD".

2) I have a file defined in CICS with LSR =3, but i didn't define any
LSRpools in CICS. In this case will CICS creates a LSR 3 POOL or it
allocates the file in POOL 1 by dynamically creating pool 1.

3) Is there a System initialize parameter to stop CICS allocating LSRPOOL. I mean, OPEN request of a file which is referring to a pool which is not created should fail.
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Robert Sample

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Joined: 06 Jun 2008
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Location: Bellevue, IA

PostPosted: Fri Nov 20, 2009 9:00 pm    Post subject:
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1. You may know specifics about an LSRPOOL that would allow you to define the pool better than CICS defaults (such as needing more strings than normal). Much of the time, it's fine to let CICS do the definition but it all depends.

2. CICS would define LSRPOOL 3 using defaults. CICS allows up to (IIRC) 8 LSR pools. If you tell CICS LSR=3, it's not going to change that to LSR=1.

3. Why on earth would you not want to use LSR pools? They are a performance boost in almost all cases. You can specify LSR=NONE for a particular file if you absolutely don't want the buffers shared, but that may cause a performance hit to the region.
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Bill O'Boyle

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Joined: 14 Jan 2008
Posts: 2502
Location: Atlanta, Georgia, USA

PostPosted: Fri Nov 20, 2009 9:26 pm    Post subject: Reply to: CICS dynamically allocates LSRPOOLs??
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As strange as this may sound, VSE supports 15 LSR Pools. icon_eek.gif

The OP should also look at defining Read-Only files (in their respective FCT entries) as CICS Data-Tables as they will yield better performance than LSR and don't involve any I-O whatsoever.

But (IIRC), ESDS files cannot be defined as Data-Tables. icon_sad.gif

As Robert has said, you really don't want CICS automatically building LSR pools unless you have good reason.

Bill
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