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| SAS/SHARE User's Guide |
The primary obstacles that limit compatibility between versions are the changes to the data file format and how applications exploit the new format. Version 7 and Version 8 offers several new features that make Version 7 and Version 8 data files incompatible with Version 6 data files. Some of the base SAS Software Version 7 and Version 8 features, which are supported by SAS/SHARE, that affect the data file format include:
Cross-version compatibility enables cross-version access that has some restrictions. Version 6 SAS sessions may be able to access Version 7 or Version 8 SAS data files if those files do not contain new Version 7 or Version 8 features.
For example, a Version 6 client can read, write, and update a Version 7 or Version 8 data file on a Version 7 or Version 8 server that has not implemented Version 7 or Version 8 features such as long variable names. Likewise, a Version 7 or Version 8 client can read, write and update a Version 6 data file on a Version 6 server if the client application adheres to the restricted mode (does not implement Version 7 or Version 8 features).
For complete information about Version 7 and Version 8 features, see SAS Language Reference: Concepts.
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