RE: Top N queries
- From: "Juan Miranda" <j.miranda@xxxxxxxxxxxx>
- To: <rachidtamba@xxxxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 7 Mar 2006 09:20:46 +0100
You can use statspack also.
set wrap on
set tab off
set trimspool on
set linesize 6000
set pagesize 60
set heading on
set serveroutput on
column SQL_TEXT format A80 wrapped
select * from
(select executions, disk_reads, buffer_gets, sql_text
from v$sqlarea
-- where parsing_user_id != 0
order by disk_reads / decode(executions,0,1,executions) desc)
where rownum <= 10
/
----------------------------------------------------------------------------
----------
prompt SQL to identify heavy SQL (Get the SQL with heavy BUFFER_GETS)
select sql_text ,executions ,disk_reads ,buffer_gets
from v$sqlarea
where decode(executions,0,buffer_gets,buffer_gets/executions)
> (select
avg(decode(executions,0,buffer_gets,buffer_gets/executions))
+ stddev(decode(executions,0,buffer_gets
,buffer_gets/executions))
from v$sqlarea)
and parsing_user_id != 0
/
prompt SQL to identify heavy SQL (Get the SQL with heavy DISK_READS)
select sql_text ,executions ,disk_reads ,buffer_gets
from v$sqlarea
where decode(executions ,0,disk_reads,disk_reads/executions)
> (select
avg(decode(executions,0,disk_reads,disk_reads/executions))
+
stddev(decode(executions,0,disk_reads,disk_reads/executions))
from v$sqlarea)
and parsing_user_id != 0
/
----------------------------------------------------------------------------
----------
prompt 10+ SQL que realizan FULL TABLE SCAN ordenados por LECTURAS DE DISCO
(sin SYS)
prompt OJO con la columna EXECUTIONS
select * from
(select t.*,p.operation,p.options from v$sqlarea t, v$sql_plan p
where t.hash_value=p.hash_value and p.operation='TABLE ACCESS' and
p.options='FULL'
and p.object_owner not in ('SYS','SYSTEM')
order by DISK_READS DESC, EXECUTIONS DESC)
where rownum <= 10;
----------------------------------------------------------------------------
------------
prompt 10+ SQL que realizan FULL TABLE SCAN ordenados por BUFFER_GETS (sin
SYS)
prompt OJO con la columna EXECUTIONS
select * from
(select t.* from v$sqlarea t, v$sql_plan p
where t.hash_value=p.hash_value and p.operation='TABLE ACCESS' and
p.options='FULL'
and p.object_owner not in ('SYS','SYSTEM')
order by BUFFER_GETS DESC, EXECUTIONS DESC)
where rownum <= 10;
----------------------------------------------------------------------------
------------
prompt ##################################################################
prompt Top 10 by Buffer Gets:
SELECT * FROM
(SELECT sql_text, buffer_gets, executions, buffer_gets/executions
"Gets/Exec", hash_value,address
FROM V$SQLAREA
WHERE buffer_gets > 10000
ORDER BY buffer_gets DESC)
WHERE rownum <= 10
/
prompt ##################################################################
prompt Top 10 by Physical Reads:
SELECT * FROM
(SELECT sql_text, disk_reads, executions, disk_reads/executions
"Reads/Exec", hash_value,address
FROM V$SQLAREA
WHERE disk_reads > 1000
ORDER BY disk_reads DESC)
WHERE rownum <= 10
/
prompt ##################################################################
prompt Top 10 by Executions:
SELECT * FROM
(SELECT sql_text,executions, rows_processed, rows_processed/executions
"Rows/Exec", hash_value,address
FROM V$SQLAREA
WHERE executions > 100
ORDER BY executions DESC)
WHERE rownum <= 10
/
prompt ##################################################################
prompt Top 10 by Parse Calls:
SELECT * FROM
(SELECT sql_text, parse_calls, executions, hash_value,address
FROM V$SQLAREA
WHERE parse_calls > 1000
ORDER BY parse_calls DESC)
WHERE rownum <= 10
/
prompt ##################################################################
prompt Top 10 by Sharable Memory:
SELECT * FROM
(SELECT sql_text, sharable_mem, executions, hash_value,address
FROM V$SQLAREA
WHERE sharable_mem > 1048576
ORDER BY sharable_mem DESC)
WHERE rownum <= 10
/
prompt ##################################################################
prompt Top 10 by Version Count:
SELECT * FROM
(SELECT sql_text, version_count, executions, hash_value,address
FROM V$SQLAREA
WHERE version_count > 20
ORDER BY version_count DESC)
WHERE rownum <= 10
/
-----------------------------------------------------------------------
--set recsepchar '-'
--set RECSEP each
--Block gets - logical i/o, current mode, usually DML activity.
--Consistent gets - logical i/o, consistent mode, usually SELECT statements
--some physical reads may be direct and may bypass the buffer cache. When
that happens, physical reads are recorded but gets are not.
--Physical reads - physical i/o, if a block get or consistent get resulted
in a cache miss, it caused a physical i/o.
--Block changes - logical i/o, how many changes were applied to blocks due
to DML. (Changes to current mode blocks)
--Consistent changes - logical i/o, how many changes were applied to blocks
for read consistency purposes. (Consistent mode changes)
set tab off
set pages 50
column usern format a6 heading 'User'
column substr(s.status,1,3) format a3 heading 'Stat'
column program format a20 wrap heading 'Program'
column event format a15 wrap heading 'Evento|espera'
column SID format 999 heading 'SID'
column waitt format A8 heading 'waits'
column txt format a200 wrapped heading 'Current Statment'
column cpu format 9999
column phread format 99999 heading 'Lecturas|Fisicas'
column consistent_gets format 9999999 heading 'Consistent|gets'
column spid format A6 heading 'OSpid'
column puser format a8 heading 'O/S|ID' noprint
column BLOCK_GETS format 999999 heading 'Block|gets'
column osu format a6 heading 'OsUser'
column sser format 9999 heading 'Serial'
prompt Estadisticas de cada session abierta actualmente ordenados por
lecturas físicas
select s.username usern, p.username puser, s.osuser osu, a.sid, trim(p.spid)
spid, s.serial# sser,substr(s.status,1,3), s.PROGRAM, a.value cpu,
c.BLOCK_GETS, c.CONSISTENT_GETS, c.physical_reads phread,
trim(d.seconds_in_wait) waitt, d.event, sa.sql_text txt
from v$sesstat a,v$statname b, v$sess_io c, v$session_wait d,
v$session s, v$sqlarea sa, v$process p
where b.name = 'CPU used by this session' and
p.addr=s.paddr
and a.statistic# = b.statistic#
and a.sid=c.sid
and a.sid=d.sid
and a.sid=s.sid
AND s.sql_address=sa.address(+)
AND s.sql_hash_value=sa.hash_value(+)
order by phread DESC
/
--------------------------------------------------------------------------
column prog format A8
column username format a8 heading 'User'
prompt Estadísticas de cada sessión.
select s.sid,username,substr(program,-8,8) prog,substr(status,1,3)
stat,name,value
from v$statname n, v$sesstat s, v$session ses
where n.STATISTIC#=s.STATISTIC# and ses.sid=s.sid and s.value<>0
order by s.sid
/
-------------------------------------------------------------------------
prompt Show all running SQLs
select distinct spid, s.sid, s.serial#,to_char(sysdate -
last_call_et/(24*3600),'mm/dd/yyhh24:mi:ss') "LAST_ACTIVITY",
logon_time,
osuser,
s.program,
schemaname,
sql_text
from v$session s,
v$process p,
v$sql t
where s.paddr=p.addr
and t.hash_value(+)=s.sql_hash_value
and s.type !='BACKGROUND';
-----Mensaje original-----
De: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] En
nombre de RACHID TAMBA
Enviado el: martes, 07 de marzo de 2006 0:36
Para: oracle-l@xxxxxxxxxxxxx
Asunto: Top N queries
Hi All :
Any one has an idea how to write a script ( on UNIX ) to find out the top N
queries which are consuming a lot of resources ?
Thank you.
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