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SAS Companion for the OpenVMS Operating Environment |
The section describes how to access Version 7 data libraries using the V7 engine. The V7 engine supports indexing and compression of observations.
When to Use the V7 Engine |
Generally, SAS automatically determines the appropriate engine to use for accessing the files in the library. If you want to create a new library with an engine other than the default engine, you can override the automatic selection.
You use the V7 engine to create SAS data libraries on disk and to read from, write to, or update those libraries.
How to Select the V7 Engine |
There are three ways to select the V7 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.
Default
as the type in the
Engine:
field of the New Library dialog box.
The SAS System then selects the V7 engine automatically. SAS also selects
the V7 engine automatically if you use the DCL DEFINE command to assign an OpenVMS logical
name to an existing Version 7 SAS data library on disk and then use that logical
name as a libref in a SAS file specification.
Member Types Supported |
The V7 engine supports files with all Version 7 member types:
ACCESS | ITEMSTOR |
AUDIT | MDDB |
BACKUP | PROGRAM |
CATALOG | PUTILITY |
DATA | SASODS |
DMDB | UTILITY |
FDB | VIEW |
INDEX |
Engine/Host Options for the V7 Engine |
The V7 engine provides several engine/host options that control the creating 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 V8 engine:
The ALQ= option (allocation quantity) corresponds to the FAB$L_ALQ field in OpenVMS RMS. For additional details, see the data set option ALQ= and Guide to OpenVMS File Applications.
For additional details, see the data set option ALQMULT=.
For additional details, see the data set option BUFSIZE=.
For additional details, see the data set option CACHENUM=.
The CACHESIZ= and BUFSIZE= options are similar, but they have important differences. The BUFSIZE= option specifies the file's page size, which is permanent. It can only be set on file creation. The CACHESIZ= option is the size of the internal memory cache used for the life of the current open, so it can change any time the file is opened. Also, BUFSIZE= cannot be used as an engine/host option; it is only valid as a data set option.
For additional details, see the data set option CACHESIZ=.
For additional details, see the data set option CNTLLEV=.
If the value specified is 0, OpenVMS RMS uses the default value for the process.
The DEQ= option (default file extension quantity) corresponds to the FAB$W_DEQ field in OpenVMS RMS. For additional details, see the data set option DEQ= and Guide to OpenVMS File Applications.
For additional details, see the data set option DEQMULT=.
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Copyright 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.