Specifying resource percentile for LSR (SHARELIMIT)

The SHARELIMIT parameter in the LSR pool definition specifies the percentage of the buffers and strings that CICS® should apply to the value that it calculates.

Effects

The method used by CICS to calculate LSR pool parameters and the use of the SHARELIMIT value is described in VSAM tuning: general objectives.

This parameter has no effect if both the BUFFERS and the STRINGS parameters are specified for the pool.

Where useful

The SHARELIMIT parameter can be used in CICS systems with VSAM data sets.

Recommendations

See VSAM tuning: general objectives.

Because SHARELIMIT can be applied only to files that are allocated at initialization of the LSR pool (when the first file in the pool is opened), it is always wise to specify the decimal STRINGS and BUFFERS for an LSR pool.

How implemented

The SHARELIMIT parameter is specified in the LSR pool definition. For more information, see the CICS Resource Definition Guide.

Related tasks
VSAM and file control: improving performance
VSAM tuning: general objectives
Defining VSAM buffer allocations for NSR (INDEXBUFFERS and DATABUFFERS)
Defining VSAM buffer allocations for LSR
Defining VSAM string settings for NSR (STRINGS)
Defining VSAM string settings for LSR (STRINGS)
Specifying maximum keylength for LSR (KEYLENGTH and MAXKEYLENGTH)
Using VSAM local shared resources (LSR)
Using Hiperspace buffers
Permitting VSAM subtasking (SUBTSKS=1)
Using data tables to improve performance
Using coupling facility data tables to gain performance benefits
Performance aspects of VSAM record-level sharing (RLS)
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