Linklist

  • Linklist is used to improve the performance of program management and mechanisms utilized to locate and fetch Load modules, such as LLA and VLF.
  • Linklist is a group of system and a user-defined Load library that is a continuation of SYS1.LINKLIB and also indicates the search order the system uses for programs.
  • Can have PDS and PDS/E libraries in its concatenation.
  • The data sets are concatenated in the order in which they appear in the Linklist, and the system creates a Data Extent Block (DEB) describing the data sets concatenated to SYS1.LINKLIB and their extents.
  • By default Linklist begins with:
    • SYS1.LINKLIB
    • SYS1.MIGLIB
    • SYS1.CSSLIB
  • The linklist concatenation can be defined in PARMLIB members PROGxx or LNKLSTxx.

Notes:

When determining which data sets LLA and VLF are to manage, try to limit the choices to production Load libraries that are rarely changed. This avoids a refresh of LLA or VLF operations.

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