|SAS Companion for the OpenVMS Operating Environment|
This section describes how to access Version 6 data libraries using the V6 engine. These data libraries are disk-format data libraries, probably the most common type of libraries.
|When to Use the V6 Engine|
You use the V6 engine to create Version 6 SAS data libraries on disk and to read from, write to, or update those libraries. The V6 engine also enables you to index and compress observations. For more information about indexes and compressing observations, see SAS Language Reference: Concepts.
|How to Select the V6 Engine|
There are three ways to select the V6 engine:
Engine:field of the New Library dialog box. You can open the New Library dialog box by issuing the LIBASSIGN command in the command window.
Defaultas the type in the
Engine:field of the New Library dialog box. The SAS System then examines the data set attributes and selects the V6 engine automatically.
|Member Types Supported|
The V6 engine supports files with all Version 6 member types:
|DATA (with indexing capabilities)|
|Engine/Host Options for the V6 Engine|
The V6 engine provides several engine/host options that control the creation and access of SAS data sets. Most of the following options correspond to options that are available through OpenVMS Record Management Services (RMS).
You can use the following engine/host options with the V6 engine:
The ALQ= option (allocation quantity) corresponds to the FAB$L_ALQ field in OpenVMS RMS. For additional details, see the data set option ALQ= and Guide to OpenVMS File Applications.
The CACHESIZ= and BUFSIZE= options are similar, but they have important differences. The BUFSIZE= option specifies the file's page size, which is permanent. It can only be set on file creation. The CACHESIZ= option is the size of the internal memory cache used for the life of the current open, so it can change any time the file is opened. Also, BUFSIZE= cannot be used as an engine/host option; it is only valid as a data set option.
For additional details, see the data set option CACHESIZ=.
If the value specified is 0, OpenVMS RMS uses the default value for the process.
The DEQ= option (default file extension quantity) corresponds to the FAB$W_DEQ field in OpenVMS RMS. For additional details, see the data set option DEQ= and Guide to OpenVMS File Applications.
|Data Set Options Supported by the V6 Engine|
The V6 engine recognizes all the data set options that are documented in SAS Language Reference: Dictionary except the FILECLOSE= option. The engine/host options discussed in Engine/Host Options for the V6 Engine can also be used as data set options when you use the V6 engine. For more information about data set options, see Data Set Options.
|System Option Values Used by the V6 Engine|
The V6 engine uses the values of the BUFNO= and BUFSIZE= system options to determine permanent physical characteristics of output SAS data sets. For details about these system options, see BUFNO= and BUFSIZE=.
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