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BEGIN
/* Show the conflict resolution logic with a tiny hash table
whose starting value is right at the end of the valid range. */
altind.trc (2**31-5, 20);
altind.loadcache;
altind.notrc;
altind.loadcache;
END;
/
CREATE OR REPLACE PROCEDURE altind_compare (
counter IN INTEGER,
ename_in IN VARCHAR2
)
/* Compare performance of hash scan and full table scan. */
IS
emprec employee%ROWTYPE;
BEGIN
sf_timer.set_factor (counter);
sf_timer.start_timer;
FOR i IN 1 .. counter
LOOP
emprec := altind.onerow (ename_in, TRUE);
IF i = 1
THEN
do.pl /* do.pkg */ (emprec.employee_id);
END IF;
END LOOP;
sf_timer.show_elapsed_time ('Hash');
sf_timer.set_factor (counter);
sf_timer.start_timer;
FOR i IN 1 .. counter
LOOP
emprec := altind.onerow (ename_in, FALSE);
IF i = 1
THEN
do.pl /* do.pkg */ (emprec.employee_id);
END IF;
END LOOP;
sf_timer.show_elapsed_time ('Full index-by scan');
sf_timer.set_factor (counter);
sf_timer.start_timer;
FOR i IN 1 .. counter
LOOP
emprec := altind.onerow_dbind (ename_in);
IF i = 1
THEN
do.pl /* do.pkg */ (emprec.employee_id);
END IF;
END LOOP;
sf_timer.show_elapsed_time ('Indexed DB lookup');
sf_timer.set_factor (counter);
sf_timer.start_timer;
FOR i IN 1 .. counter
LOOP
emprec := altind.onerow_dbnoind (ename_in);
IF i = 1
THEN
do.pl /* do.pkg */ (emprec.employee_id);
END IF;
END LOOP;
sf_timer.show_elapsed_time ('Non-indexed DB lookup');
END;
/
BEGIN
do.pl /* do.pkg */ ('Testing for SMITH');
altind_compare (1000, 'SMITH');
END;
/
BEGIN
do.pl /* do.pkg */ ('Testing for WEST');
altind_compare (1000, 'WEST');
END;
/
BEGIN
do.pl /* do.pkg */ ('Testing for MURRAY');
altind_compare (1000, 'MURRAY');
END;
/
/*======================================================================
| Supplement to the fifth edition of Oracle PL/SQL Programming by Steven
| Feuerstein with Bill Pribyl, Copyright (c) 1997-2009 O'Reilly Media, Inc.
| To submit corrections or find more code samples visit
| http://oreilly.com/catalog/9780596514464/
*/