Skip to Content
Information

This site will undergo a brief period of maintenance on Friday, 18 December at 12:30 AM Central/12:00 PM IST. During a 30 minute window, site availability may be intermittent.

Information
Limited support BMC provides limited support for this version of the product. As a result, BMC no longer accepts comments in this space. If you encounter problems with the product version or the space, contact BMC Support.BMC recommends upgrading to the latest version of the product. To see documentation for that version, see BMC AMI Batch Optimizer (Advanced and Standard) 2.9.

LSR option

With the LSR option, you can specify the degree to which LSR processing is used.

 

Parameter

Description

Values

This option has the following possible values:

  • Y (Yes) - Use LSR processing when appropriate. Data Optimizer uses captured history data to determine whether LSR or NSR processing optimizes I/O processing. Data Optimizer does not enable LSR where history data indicates that LSR use is unacceptable or that NSR yields better performance. You might want to specify this value to improve direct access index processing.

    Error
    Warning

    This value can cause problems for applications that cannot tolerate LSR processing.

  • N (No) - Do not enable LSR processing for files selecting this option. You might want to specify this value for applications that cannot tolerate VSAM LSR processing for specific files.
  • P (Prefer) - Enable LSR processing for VSAM files selecting this option if no other restrictions preclude its application. Data Optimizer does not use history data to make this determination. Data Optimizer use s NSR to optimize I/O if use of LSR is not possible. You might want to specify this value when you have intimate knowledge of a file and its associated applications. With this option, Data Optimizer enables LSR processing.
  • R (Require) - Optimize I/O for files using this option only if LSR processing is enabled. If Data Optimizer cannot enable LSR, it bypasses further attempts to optimize I/O for this execution.
  • F (Force) - Force Data Optimizer to place a VSAM data set into an LSR pool even if the ACB DIR bit is off. Without this option, VSAM data sets are eligible to be placed into an LSR pool only if the ACB DIR bit is on. All other restrictions disallowing placement into an LSR pool still apply.
  • H (HISTLSR) - Enable LSR processing only if the History data set indicates that LSR is recommended.
Warning

Note

The HISTLSR option applies only when both the ACB DIR and ACB SEQ bits are on.

Default value

Y

DD overrides

//DAP@LSR DD DUMMY

Use LSR processing when appropriate.

//DAP@NLSR DD DUMMY

Do not enable LSR processing for files selecting this option.

//DAP@PLSR DD DUMMY

Enable LSR processing for VSAM files selecting this option if no other restrictions preclude the use of this option.

//DAP@RLSR DD DUMMY

Optimize I/O for files selecting this option only if LSR processing is enabled.

//DAP@FLSR DD DUMMY

Force Data Optimizer to place a VSAM data set into an LSR pool.

//DAP@HLSR DD DUMMY

 Enable LSR processing only if the History data set indicates that LSR is recommended.

Data policy keywords

LSR

NOLSR

PREFERLSR

REQUIRELSR

FORCELSR

HISTLSR

Warning

Note

These keywords are honored only if you are working in ADVANCED Optimization mode.

Related topic

    VSAM-options



 

Tip: For faster searching, add an asterisk to the end of your partial query. Example: cert*

MainView Batch Optimizer (Advanced and Standard) 2.8