SQL> set serveroutput on
set echo on
drop role plustrace;
create role plustrace;
grant select on v_$sesstat to plustrace;
grant select on v_$statname to plustrace;
grant select on v_$mystat to plustrace;
grant plustrace to dba with admin option;
set echo off
| 실제수행여부 | 수행결과 | 실행계획 | 실행통계 | |
|---|---|---|---|---|
| set autotrace on | O | O | O | O |
| set autotrace on explain | O | O | O | |
| set autotrace on statistics | O | O | O | |
| set autotrace on traceonly | O | O | O | |
| set autotrace on traceonly explain | O | |||
| set autotrace on traceonly statistics | O | O |
-- sys로 접속
-- view 생성
create or replace view stats
as select 'STAT...' || a.name name, b.value
from v$statname a, v$mystat b
where a.statistic# = b.statistic#
union all
select 'LATCH.' || name, gets
from v$latch
union all
select 'STAT...Elapsed Time', hsecs from v$timer;
-- 글로벌 템프 테이블 생성 (세션단위 데이터 유지로)
create global temporary table run_stats
( runid varchar2(15),
name varchar2(80),
value int )
on commit preserve rows;
-- 패키지 생성
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_time;
end;
procedure rs_middle
is
begin
g_run1 := (dbms_utility.get_time-g_start);
insert into run_stats
select 'after 1', stats.* from stats;
g_start := dbms_utility.get_time;
end;
procedure rs_stop(p_difference_threshold in number default 0)
is
begin
g_run2 := (dbms_utility.get_time-g_start);
dbms_output.put_line
( 'Run1 ran in ' || g_run1 || ' hsecs' );
dbms_output.put_line
( 'Run2 ran in ' || g_run2 || ' 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(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;
/
-- synonym 생성
create public synonym stats for stats;
create public synonym run_stats for run_stats;
create public synonym runstats_pkg for runstats_pkg;
-- 권한 부여
grant select on stats to public;
grant all on run_stats to public;
grant execute on runstats_pkg to public;
-- 테스트 테이블 생성
create table t1
as
select * from big_table
where 1=0;
create table t2
as
select * from big_table
where 1=0;
exec runstats_pkg.rs_start;
insert into t1
select *
from big_table
where rownum <= 100000;
commit;
exec runstats_pkg.rs_middle;
begin
for x in (select * from big_table where rownum <= 100000)
loop
insert into t2 values x;
end loop;
commit;
end;
/
exec runstats_pkg.rs_stop(100000);
Run1 ran in 450 hsecs
Run2 ran in 599 hsecs
run 1 ran in 75.13% of the time
Name Run1 Run2 Diff
LATCH.shared pool 350 100,365 100,015
STAT...recursive calls 497 101,467 100,970
STAT...db block changes 11,980 209,367 197,387
STAT...physical read total byt 1,032,192 688,128 -344,064
LATCH.cache buffers chains 61,722 555,472 493,750
STAT...physical write total by 4,251,648 2,834,432 -1,417,216
STAT...cell physical IO interc 5,283,840 3,522,560 -1,761,280
STAT...undo change vector size 392,044 6,404,460 6,012,416
STAT...redo size 12,332,532 37,717,016 25,384,484
STAT...logical read bytes from 173,244,416 981,065,728 807,821,312
Run1 latches total versus runs -- difference and pct
Run1 Run2 Diff Pct
73,672 676,091 602,419 10.90%
h2.Mystat
-- mystat.sql
set echo off
set verify off
column value new_val V
define S="&1"
set autotrace off
select a.name, b.value
from v$statname a, v$mystat b
where a.statistic# = b.statistic#
and lower(a.name) like lower('&S')
/
set echo on
-- mystat2.sql
set echo off
set verify off
select a.name, b.value V, to_char(b.value-&V, '999,999,999,999') diff
from v$statname a, v$mystat b
where a.statistic# = b.statistic#
and lower(a.name) like lower('&S')
/
set echo on
@mystat "redo size"
NAME VALUE
---------------------------------------------------------------- ----------
redo size 156048
update big_table set owner = lower(owner)
where rownum <= 1000;
1000 행이 갱신되었습니다.
@mystat2
NAME V DIFF
---------------------------------------------------------------- ---------- ----------------
redo size 257348 101,300
rollback;
create or replace procedure show_space
( p_segname in varchar2,
p_owner in varchar2 default user,
p_type in varchar2 default 'TABLE',
p_partition in varchar2 default NULL )
-- this procedure uses authid current user so it can query DBA_*
-- views using privileges from a ROLE and so it can be installed
-- once per database, instead of once per user that wanted to use it
-- authid current_user
as
l_free_blks number;
l_total_blocks number;
l_total_bytes number;
l_unused_blocks number;
l_unused_bytes number;
l_LastUsedExtFileId number;
l_LastUsedExtBlockId number;
l_LAST_USED_BLOCK number;
l_segment_space_mgmt varchar2(255);
l_unformatted_blocks number;
l_unformatted_bytes number;
l_fs1_blocks number; l_fs1_bytes number;
l_fs2_blocks number; l_fs2_bytes number;
l_fs3_blocks number; l_fs3_bytes number;
l_fs4_blocks number; l_fs4_bytes number;
l_full_blocks number; l_full_bytes number;
-- inline procedure to print out numbers nicely formatted
-- with a simple label
procedure p( p_label in varchar2, p_num in number )
is
begin
dbms_output.put_line( rpad(p_label,40,'.') ||
to_char(p_num,'999,999,999,999') );
end;
begin
-- this query is executed dynamically in order to allow this procedure
-- to be created by a user who has access to DBA_SEGMENTS/TABLESPACES
-- via a role as is customary.
-- NOTE: at runtime, the invoker MUST have access to these two
-- views!
-- this query determines if the object is a ASSM object or not
begin
execute immediate
'select ts.segment_space_management
from dba_segments seg, dba_tablespaces ts
where seg.segment_name = :p_segname
and (:p_partition is null or
seg.partition_name = :p_partition)
and seg.owner = :p_owner
and seg.tablespace_name = ts.tablespace_name'
into l_segment_space_mgmt
using p_segname, p_partition, p_partition, p_owner;
exception
when too_many_rows then
dbms_output.put_line
( 'This must be a partitioned table, use p_partition => ');
return;
end;
-- if the object is in an ASSM tablespace, we must use this API
-- call to get space information, else we use the FREE_BLOCKS
-- API for the user managed segments
if l_segment_space_mgmt = 'AUTO'
then
dbms_space.space_usage
( p_owner, p_segname, p_type, l_unformatted_blocks,
l_unformatted_bytes, l_fs1_blocks, l_fs1_bytes,
l_fs2_blocks, l_fs2_bytes, l_fs3_blocks, l_fs3_bytes,
l_fs4_blocks, l_fs4_bytes, l_full_blocks, l_full_bytes, p_partition);
p( 'Unformatted Blocks ', l_unformatted_blocks );
p( 'FS1 Blocks (0-25) ', l_fs1_blocks );
p( 'FS2 Blocks (25-50) ', l_fs2_blocks );
p( 'FS3 Blocks (50-75) ', l_fs3_blocks );
p( 'FS4 Blocks (75-100)', l_fs4_blocks );
p( 'Full Blocks ', l_full_blocks );
else
dbms_space.free_blocks(
segment_owner => p_owner,
segment_name => p_segname,
segment_type => p_type,
freelist_group_id => 0,
free_blks => l_free_blks);
p( 'Free Blocks', l_free_blks );
end if;
-- and then the unused space API call to get the rest of the
-- information
dbms_space.unused_space
( segment_owner => p_owner,
segment_name => p_segname,
segment_type => p_type,
partition_name => p_partition,
total_blocks => l_total_blocks,
total_bytes => l_total_bytes,
unused_blocks => l_unused_blocks,
unused_bytes => l_unused_bytes,
LAST_USED_EXTENT_FILE_ID => l_LastUsedExtFileId,
LAST_USED_EXTENT_BLOCK_ID => l_LastUsedExtBlockId,
LAST_USED_BLOCK => l_LAST_USED_BLOCK );
p( 'Total Blocks', l_total_blocks );
p( 'Total Bytes', l_total_bytes );
p( 'Total MBytes', trunc(l_total_bytes/1024/1024) );
p( 'Unused Blocks', l_unused_blocks );
p( 'Unused Bytes', l_unused_bytes );
p( 'Last Used Ext FileId', l_LastUsedExtFileId );
p( 'Last Used Ext BlockId', l_LastUsedExtBlockId );
p( 'Last Used Block', l_LAST_USED_BLOCK );
end;
/
-- synonym 생성
create public synonym show_space for show_space;
-- 권한 부여
grant execute on show_space to public;
exec show_space('BIG_TABLE');
Unformatted Blocks ..................... 0
FS1 Blocks (0-25) ..................... 0
FS2 Blocks (25-50) ..................... 0
FS3 Blocks (50-75) ..................... 0
FS4 Blocks (75-100)..................... 0
Full Blocks ..................... 7,565
Total Blocks............................ 7,808
Total Bytes............................. 63,963,136
Total MBytes............................ 61
Unused Blocks........................... 113
Unused Bytes............................ 925,696
Last Used Ext FileId.................... 4
Last Used Ext BlockId................... 8,320
Last Used Block......................... 15
-- 테이블 생성
create table big_table nologging
as
select rownum id, a.*
from all_objects a
where 1 = 0;
-- 데이터 입력
declare
l_cnt number;
l_rows number := &1;
begin
insert /*+ append */
into big_table
select rownum, a.*
from all_objects a
where rownum <= &1;
l_cnt := sql%rowcount;
commit;
while (l_cnt < l_rows)
loop
insert /*+ append */ into big_table
select rownum + l_cnt, a.*
from all_objects a
where rownum <= l_rows - l_cnt;
l_cnt := l_cnt + sql%rowcount;
commit;
end loop;
end;
/
-- pk 생성
alter table big_table add constraint
big_table_pk primary key(id);
-- 통계 생성
exec dbms_stats.gather_table_stats(user, 'BIG_TABLE', estimate_percent=> 1);