Release 10.1A: OpenEdge Data Management:
Database Administration

> ## Direct I/O

> The database engine can use an I/O technique that forces blocks to be written directly from the buffer pool to disk. This optional technique prevents writes to disk from being deferred by the operating system’s buffer manager.

> In general, use Direct I/O only if you are experiencing memory shortages. In many cases the normal buffered I/O will provide better performance. Test the performance impact before implementing Direct I/O on a production database.

> To use this feature, specify the Direct I/O (-`directio`) startup parameter. If you use the -`directio` startup parameter, you might need to add additional APWs to compensate for the fact that with Direct I/O, each database write requires more processing time from the APWs.

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