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Returns the long plan optimization strategy of a SQL statement, as a string.
PLAN( string-expression, [ cursor-type ], [ update-status ] )
string-expression The SQL statement, which is commonly a SELECT statement but which may also be an UPDATE or DELETE statement.
cursor-type A string. cursor-type can be asensitive (default), insensitive, sensitive, or keyset-driven.
update-status A string parameter accepting one of the following values indicating how the optimizer should treat the given cursor:
|READ-ONLY||The cursor is read-only.|
|READ-WRITE (default)||The cursor can be read or written to.|
|FOR UPDATE||The cursor can be read or written to. This is exactly the same as READ-WRITE.|
SQL/2003 Vendor extension.
The following statement passes a SELECT statement as a string parameter and returns the plan for executing the query.
SELECT PLAN( 'SELECT * FROM Departments WHERE DepartmentID > 100' );
This information can help with decisions about indexes to add or how to structure your database for better performance.
The following statement returns a string containing the text plan for an INSENSITIVE cursor over the query
SELECT * FROM Departments WHERE DepartmentID > 100;.
SELECT PLAN( 'SELECT * FROM Departments WHERE DepartmentID > 100', 'insensitive', 'read-only' );
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