CREATE OR REPLACE PACKAGE runstats_pkg
AS
    PROCEDURE rs_start;
    PROCEDURE rs_middle;
    PROCEDURE rs_stop( p_difference_threshold IN NUMBER DEFAULT 0 );
END;
/

CREATE OR REPLACE PACKAGE BODY runstats_pkg
AS

g_start NUMBER;
g_run1  NUMBER;
g_run2  NUMBER;

PROCEDURE rs_start
IS
BEGIN
    DELETE FROM run_stats;

    INSERT INTO run_stats
    SELECT 'before', stats.* FROM stats;

    g_start := dbms_utility.get_cpu_time;
END;

PROCEDURE rs_middle
IS
BEGIN
    g_run1 := (dbms_utility.get_cpu_time-g_start);

    INSERT INTO run_stats
    SELECT 'after 1', stats.* FROM stats;
    g_start := dbms_utility.get_cpu_time;

END;

PROCEDURE rs_stop(p_difference_threshold IN NUMBER DEFAULT 0)
IS
BEGIN
    g_run2 := (dbms_utility.get_cpu_time-g_start);

    dbms_output.put_line
    ( 'Run1 ran in ' || g_run1 || ' cpu hsecs' );
    dbms_output.put_line
    ( 'Run2 ran in ' || g_run2 || ' cpu hsecs' );
        IF ( g_run2 <> 0 )
        THEN
    dbms_output.put_line
    ( 'run 1 ran in ' || ROUND(g_run1/g_run2*100,2) ||
      '% of the time' );
        END IF;
    dbms_output.put_line( CHR(9) );

    INSERT INTO run_stats
    SELECT 'after 2', stats.* FROM stats;

    dbms_output.put_line
    ( RPAD( 'Name', 30 ) || LPAD( 'Run1', 12 ) ||
      LPAD( 'Run2', 12 ) || LPAD( 'Diff', 12 ) );

    FOR x IN
    ( SELECT RPAD( a.name, 30 ) ||
             TO_CHAR( b.value-a.VALUE, '999,999,999' ) ||
             TO_CHAR( c.value-b.VALUE, '999,999,999' ) ||
             TO_CHAR( ( (c.value-b.VALUE)-(b.value-a.VALUE)), '999,999,999' ) data
        FROM run_stats a, run_stats b, run_stats c
       WHERE a.name = b.name
         AND b.name = c.name
         AND a.runid = 'before'
         AND b.runid = 'after 1'
         AND c.runid = 'after 2'
         -- and (c.value-a.value) > 0
         AND ABS( (c.value-b.VALUE) - (b.value-a.VALUE) )
               > p_difference_threshold
       ORDER BY ABS( (c.value-b.VALUE)-(b.value-a.VALUE))
    ) LOOP
        dbms_output.put_line( x.data );
    END LOOP;

    dbms_output.put_line( CHR(9) );
    dbms_output.put_line
    ( 'Run1 latches total versus runs -- difference and pct' );
    dbms_output.put_line
    ( LPAD( 'Run1', 12 ) || LPAD( 'Run2', 12 ) ||
      LPAD( 'Diff', 12 ) || LPAD( 'Pct', 10 ) );

    FOR x IN
    ( SELECT TO_CHAR( run1, '999,999,999' ) ||
             TO_CHAR( run2, '999,999,999' ) ||
             TO_CHAR( diff, '999,999,999' ) ||
             TO_CHAR( ROUND( run1/DECODE( run2, 0, TO_NUMBER(NULL), run2) *100,2 ), '99,999.99' ) || '%' data
        FROM ( SELECT SUM(b.value-a.VALUE) run1, SUM(c.value-b.VALUE) run2,
                      SUM( (c.value-b.VALUE)-(b.value-a.VALUE)) diff
                 FROM run_stats a, run_stats b, run_stats c
                WHERE a.name = b.name
                  AND b.name = c.name
                  AND a.runid = 'before'
                  AND b.runid = 'after 1'
                  AND c.runid = 'after 2'
                  AND a.name LIKE 'LATCH%'
                )
    ) LOOP
        dbms_output.put_line( x.data );
    END LOOP;
END;

END;