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How SAS Assigns an Engine When No Engine Is Specified

In some cases, you may choose not to specify an engine name in the LIBNAME statement or function for a data library. For these situations, you need to know how SAS assigns an engine to the library.

• If you specify TAPn as the physical name, SAS assigns the engine that is specified by the SEQENGINE= system option. This is true for both new and existing libraries.

• For existing libraries on disk, SAS examines the library header record and assigns an engine that is based on its content. The engines follow:
  • V7 for a Version 7 standard library.

  • V7TAPE for a Version 7 sequential library.

  • V6 for a Version 6 standard library.

  • V6TAPE for a Version 6 sequential library.

  • V5 for any Version 5 library.

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