How many ways you can invoke SAS in Mainframe:
You can invoke SAS with any of the following methods:
- in interactive mode under TSO using the SAS CLIST
- in interactive mode under TSO using the SASRX exec
- in batch mode with the SAS cataloged procedure
- by logging on to SAS directly and bypassing the TSO terminal monitor program.
Overview of SAS Library Engines
SAS provides different engines that enable you to access and, in most cases, to update files of different types and different formats.
A native library engine is an engine that accesses forms of SAS files that are created and processed only by SAS.
The V9 Engine
The default Base SAS engine for SAS libraries is V9. The V9 engine creates libraries in the V9 format, and it can also read and write libraries created using the V7 and V8 engines.
The V9 engine is the appropriate choice for most applications because it supports the full SAS data set functionality. The V9 engine also exploits the random access capabilities of disk devices to achieve greater performance than is possible with sequential engines.
The V9 engine is the default engine in most cases, but you can change the specified default engine with the ENGINE system option. The V9 engine can be used only for the types of devices that support it.
Use BASE as the engine name if you write programs that create new SAS libraries and you want to create the libraries in the latest available format. In SAS®9, BASE is an alias for V9, and it will be an alias for newer engines in subsequent releases of SAS.
The V9TAPE Engine
The sequential engine for SAS libraries is V9TAPE. The V9TAPE engine creates sequential libraries in the V9TAPE format, and it can also read and write libraries created using the V7TAPE and V8TAPE engines.
- The V9TAPE engine provides a way to store files on devices such as tape that do not support random access. Some of the uses of the V9TAPE engine on z/OS include
- archiving SAS files to tape for long-term storage.
- transporting SAS files between your z/OS system and another z/OS system or CMS system via tape.
- sending SAS data, via a pipe connection, for immediate consumption by another job running in parallel.
In contrast to the V9 engine, V9TAPE has the following limitations:
- does not support indexing, compression of observations, or audit trail capabilities
- does not support direct access to individual observations (using the POINT= or KEY= options in the SET or MODIFY statements)
- provides limited support for the following types of SAS library members: ACCESS, CATALOG, PROGRAM, and VIEW. You can move or transport these member types, but you cannot use the V9TAPE engine to access the information within these members.
Overview of Compatibility Engines
SAS provides various compatibility engines for the purpose of processing libraries that were created by previous versions of SAS.
The type of engine that should be used depends on the engine format of the library. In most cases, SAS can detect the engine format and automatically select the appropriate engine to use.
However, if you are using SAS 9.2 to create a new library or new members that will be processed by a prior version of SAS, you need to explicitly specify (on a LIBNAME statement or function) an engine that creates a library or members in a format that can be processed by the prior version of SAS. For more information about cross-release compatibility and migration, see the Migration focus area at support.sas.com/migration.
The following Base SAS engine library formats can be read and written by SAS 9.2:
Libraries created by the default Base SAS engine in V8 or V7 are identified by SAS 9.2 as being in V9 format.
These libraries were created using the default Base SAS engine in V6 or using the V6 compatibility engine under a later version of SAS.
Specifying one of the following compatibility engines has the indicated effect:
V8- creates a V9 library but does not allow creation of members with format names longer than 8 bytes.
V7- has the same effect as V8.
V6- creates a V6 format library.
The following sequential engine library formats can be read and written by SAS 9.2:
V9TAPE library- Libraries created by the default sequential engine in V8 or V7 are identified by SAS 9.2 as being in V9TAPE format.
V6TAPE library- These libraries were created using the default sequential engine in V6 or using the V6TAPE compatibility engine under a later version of SAS.