In a message dated 5/8/2007 9:48:16 A.M. Central Daylight Time,
[EMAIL PROTECTED] writes:
It's not that simple of course. It has nothing to do with paging counts
either.
>>
Since DFP 1.4, IBM recommends SMB vs BLSR. Might start small and see if it
can
work in this situation. Certainly gives you better numbers to wave around.
Some restrictions:
2.5.4.2 Tuning for System-Managed Buffering
VSAM can use a technique called system-managed buffering (SMB
) to determine the number of buffers and the type of buffer management to
use for VSAM data sets. VSAM also determines the number of buffers to locate
in
Hiperspace(TM) for use in direct optimization.
To indicate that VSAM is to use SMB, specify either of the following options:
* Specify the ACCBIAS subparameter of the JCL DD statement AMP
parameter and an appropriate value for record access bias.
* Specify Record Access Bias in the data class and an application
processing option in the ACB.
For system-managed buffering (SMB), the data set must use both of the
following options:
* System Management Subsystem (SMS) storage
* Extended format (DSNTYPE=ext in the data class)
JCL takes precedence over the specification in the data class. You must
specify NSR. SMB either weights or optimizes buffer handling toward sequential
or
direct processing.
To optimize your extended format data sets, use the ACCBIAS subparameter of
the AMP parameter along with related subparameters SMBVSP, SMBDFR, and SMBHWT.
You can also use these subparameters with Record Access Bias=SYSTEM in the
data class. These subparameters are only for Direct Optimized processing.
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