Execution of an SPL Routine

When the database server executes an SPL routine with the EXECUTE PROCEDURE statement, with the CALL statement, or within an SQL statement, the following activities occur:

• The database server reads the interpreter code from the system catalog tables and converts it from a compressed format to an executable format. If the SPL routine is in the UDR cache, the database server retrieves it from the cache and bypasses the conversion step.
• The database server executes any SPL statements that it encounters.
• When the database server encounters an SQL statement, it retrieves the query plan from the database and executes the statement. If the query plan has not been created, the database server optimizes the SQL statement before it executes.
• When the database server reaches the end of the SPL routine or when it encounters a RETURN statement, it returns any results to the client application. Unless the RETURN statement has a WITH RESUME clause, the SPL routine execution is complete.