OpenEdge Data Management: DataServer for Microsoft SQL Server

Chapter 4: Additional Features to Enhance DataServer Performance
Replacing FIND FIRST for performance
When coding ABL applications for the DataServer, FIND FIRST statements can often
be replaced with other ABL statements to greatly improve performance. OPEN QUERYs
and dynamic FINDs are significantly more efficient. Likewise, using FOR FIRST in place
of FIND FIRST can improve performance when retrieving a single record with NO-LOCK.
For example, if your application uses the following FIND FIRST code:
FIND FIRST tablename WHERE where-clause NO-LOCK.
The code can be replaced with the following for significant performance gains:
FOR FIRST tablename WHERE where-clause NO-LOCK:
END.
In the case of the FOR FIRST, the record is not reliably available beyond the end of the
FOR FIRST loop unless a LEAVE is specified. Similar performance advantages can be
gained when retrieving last record as well.
180 OpenEdge Data Management: DataServer for Microsoft SQL Server