oracle sql性能对比工具runstats

此工具是tom编写的工具，用来评估sql的消耗

创建：

1授权

grant SELECT on SYS.v_$statname to "SCOTT" ;
grant SELECT on SYS.v_$mystat to "SCOTT" ;
grant SELECT on SYS.v_$latch to "SCOTT" ;
grant SELECT on SYS.v_$timer to "SCOTT" ;
grant  create view to scott;

2创建视图

--在scott账户下创建视图
create or replace view stats
as select 'STAT...' || a.name name, b.value
from SYS.v_$statname a, SYS.v_$mystat b
where a.statistic# = b.statistic#
union all
select 'LATCH.' || name,  gets
from SYS.v_$latch
union all
select 'STAT...Elapsed Time', hsecs from SYS.v_$timer;

3创建信息表

--创建信息收集表
create global temporary table run_stats
( runid varchar2(15),
name varchar2(80),
value int )
on commit preserve rows;

4创建包

--创建包
create or replace package runstats_pkg
as
procedure rs_start;
procedure rs_middle;
procedure rs_stop( p_difference_threshold in number default 0 );
end;
/

5创建包体

--创建包体
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 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(0), 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;
/

使用：

执行runstats中的方法以及两个存储过程

SQL> set serverout on
SQL> exec dbms_output.put_line('ok');

SQL> exec runstats_pkg.rs_start;

PL/SQL procedure successfully completed

SQL> select * from emp where empno='7369';

EMPNO ENAME      JOB         MGR HIREDATE          SAL      COMM DEPTNO

----- ---------- --------- ----- ----------- --------- --------- ------

 7369 SMITH      CLERK      7902 1980/12/17     800.00               20

SQL> exec runstats_pkg.rs_middle;

PL/SQL procedure successfully completed

SQL> select /*+ full(e)*/ * from emp e where e.empno='7369';

EMPNO ENAME      JOB         MGR HIREDATE          SAL      COMM DEPTNO

----- ---------- --------- ----- ----------- --------- --------- ------

 7369 SMITH      CLERK      7902 1980/12/17     800.00               20

SQL> exec runstats_pkg.rs_stop(10000);

Run1 ran in 1 cpu hsecs

Run2 ran in 1 cpu hsecs

run 1 ran in 100% of the time

    

Name                                  Run1        Run2        Diff

STAT...session pga memory           65,536           0     -65,536

STAT...logical read bytes from     376,832     516,096     139,264

    

Run1 latches total versus runs -- difference and pct

        Run1        Run2        Diff       Pct

       2,720       6,631       3,911     41.02%

PL/SQL procedure successfully completed