以下脚本来自于 http://www.oracle-base.com/dba/DBACategories.php

-- -----------------------------------------------------------------------------------
-- File Name    : http://www.oracle-base.com/dba/monitoring/top_sql.sql
-- Author       : DR Timothy S Hall
-- Description : Displays a list of SQL statements that are using the most resources.
-- Comments     : The address column can be use as a parameter with SQL_Text.sql to display the full statement.
-- Requirements : Access to the V$ views.
-- Call Syntax : @top_sql (number)
-- Last Modified: 15/07/2000
-- -----------------------------------------------------------------------------------
SET LINESIZE 500
SET PAGESIZE 1000
SET VERIFY OFF

SELECT *
FROM   (SELECT Substr(a.sql_text,1,50) sql_text,
               Trunc(a.disk_reads/Decode(a.executions,0,1,a.executions)) reads_per_execution,
               a.buffer_gets,
               a.disk_reads,
               a.executions,
               a.sorts,
               a.address
        FROM   v$sqlarea a
        ORDER BY 2 DESC)
WHERE rownum <= &&1;

SET PAGESIZE 14

-- -----------------------------------------------------------------------------------
-- File Name    : http://www.oracle-base.com/dba/monitoring/top_sessions.sql
-- Author       : DR Timothy S Hall
-- Description : Displays information on all database sessions ordered by executions.
-- Requirements : Access to the V$ views.
-- Call Syntax : @top_sessions.sql (reads, execs or cpu)
-- Last Modified: 21/02/2005
-- -----------------------------------------------------------------------------------
SET LINESIZE 500
SET PAGESIZE 1000
SET VERIFY OFF

COLUMN username FORMAT A15
COLUMN machine FORMAT A25
COLUMN logon_time FORMAT A20

SELECT NVL(a.username, '(oracle)') AS username,
       a.osuser,
       a.sid,
       a.serial#,
       c.value AS &1,
       a.lockwait,
       a.status,
       a.module,
       a.machine,
       a.program,
       TO_CHAR(a.logon_Time,'DD-MON-YYYY HH24:MI:SS') AS logon_time
FROM   v$session a,
       v$sesstat c,
       v$statname d
WHERE a.sid        = c.sid
AND    c.statistic# = d.statistic#
AND    d.name       = DECODE(UPPER('&1'), 'READS', 'session logical reads',
                                          'EXECS', 'execute count',
                                          'CPU',   'CPU used by this session',
                                                   'CPU used by this session')
ORDER BY c.value DESC;

SET PAGESIZE 14

-- -----------------------------------------------------------------------------------
-- File Name    : http://www.oracle-base.com/dba/monitoring/top_latches.sql
-- Author       : DR Timothy S Hall
-- Description : Displays information about the top latches.
-- Requirements : Access to the V$ views.
-- Call Syntax : @top_latches
-- Last Modified: 15-JUL-2000
-- -----------------------------------------------------------------------------------
SET LINESIZE 200

SELECT l.latch#,
       l.name,
       l.gets,
       l.misses,
       l.sleeps,
       l.immediate_gets,
       l.immediate_misses,
       l.spin_gets
FROM   v$latch l
WHERE l.misses > 0
ORDER BY l.misses DESC;

-- -----------------------------------------------------------------------------------
-- File Name    : http://www.oracle-base.com/dba/10g/session_waits.sql
-- Author       : DR Timothy S Hall
-- Description : Displays information on all database session waits.
-- Requirements : Access to the V$ views.
-- Call Syntax : @session_waits
-- Last Modified: 11/03/2005
-- -----------------------------------------------------------------------------------
SET LINESIZE 200
SET PAGESIZE 1000

COLUMN username FORMAT A20
COLUMN event FORMAT A30
COLUMN wait_class FORMAT A15

SELECT NVL(s.username, '(oracle)') AS username,
       s.sid,
       s.serial#,
       sw.event,
       sw.wait_class,
       sw.wait_time,
       sw.seconds_in_wait,
       sw.state
FROM   v$session_wait sw,
       v$session s
WHERE s.sid = sw.sid
ORDER BY sw.seconds_in_wait DESC;

-- -----------------------------------------------------------------------------------
-- File Name    : http://www.oracle-base.com/dba/monitoring/longops.sql
-- Author       : DR Timothy S Hall
-- Description : Displays information on all long operations.
-- Requirements : Access to the V$ views.
-- Call Syntax : @longops
-- Last Modified: 05/07/2007
--
-- Thanks to Will Rose for noticing my mistake in using ROUND rather than TRUNC when
-- calculating seconds.
-- -----------------------------------------------------------------------------------

COLUMN sid FORMAT 999
COLUMN serial# FORMAT 9999999
COLUMN machine FORMAT A30
COLUMN progress_pct FORMAT 99999999.00
COLUMN elapsed FORMAT A10
COLUMN remaining FORMAT A10

SELECT s.sid,
       s.serial#,
       s.machine,
       TRUNC(sl.elapsed_seconds/60) || ':' || MOD(sl.elapsed_seconds,60) elapsed,
       TRUNC(sl.time_remaining/60) || ':' || MOD(sl.time_remaining,60) remaining,
       ROUND(sl.sofar/sl.totalwork*100, 2) progress_pct
FROM   v$session s,
       v$session_longops sl
WHERE s.sid     = sl.sid
AND    s.serial# = sl.serial#;

-- -----------------------------------------------------------------------------------
-- File Name    : http://www.oracle-base.com/dba/monitoring/locked_objects.sql
-- Author       : DR Timothy S Hall
-- Description : Lists all locked objects.
-- Requirements : Access to the V$ views.
-- Call Syntax : @locked_objects
-- Last Modified: 15/07/2000
-- -----------------------------------------------------------------------------------
SET LINESIZE 500
SET PAGESIZE 1000
SET VERIFY OFF

COLUMN owner FORMAT A20
COLUMN username FORMAT A20
COLUMN object_owner FORMAT A20
COLUMN object_name FORMAT A30
COLUMN locked_mode FORMAT A15

SELECT b.session_id AS sid,
       NVL(b.oracle_username, '(oracle)') AS username,
       a.owner AS object_owner,
       a.object_name,
       Decode(b.locked_mode, 0, 'None',
                             1, 'Null (NULL)',
                             2, 'Row-S (SS)',
                             3, 'Row-X (SX)',
                             4, 'Share (S)',
                             5, 'S/Row-X (SSX)',
                             6, 'Exclusive (X)',
                             b.locked_mode) locked_mode,
       b.os_user_name
FROM   dba_objects a,
       v$locked_object b
WHERE a.object_id = b.object_id
ORDER BY 1, 2, 3, 4;

SET PAGESIZE 14
SET VERIFY ON

-- -----------------------------------------------------------------------------------
-- File Name    : http://www.oracle-base.com/dba/monitoring/invalid_objects.sql
-- Author       : DR Timothy S Hall
-- Description : Lists all invalid objects in the database.
-- Call Syntax : @invalid_objects
-- Requirements : Access to the DBA views.
-- Last Modified: 18/12/2005
-- -----------------------------------------------------------------------------------
COLUMN object_name FORMAT A30
SELECT owner,
       object_type,
       object_name,
       status
FROM   dba_objects
WHERE status = 'INVALID'
ORDER BY owner, object_type, object_name;

其他：

-- 值得怀疑的SQL
select substr(to_char(s.pct, '99.00'), 2) || '%' load,
       s.executions executes,
       p.sql_text
from (select address,
               disk_reads,
               executions,
               pct,
               rank() over(order by disk_reads desc) ranking
          from (select address,
                       disk_reads,
                       executions,
                       100 * ratio_to_report(disk_reads) over() pct
                  from sys.v_$sql
                 where command_type != 47)
         where disk_reads > 50 * executions) s,
       sys.v_$sqltext p
where s.ranking <= 5
   and p.address = s.address
order by 1, s.address, p.piece;

-- 逻辑读多的SQL
select *
from (select buffer_gets, sql_text
          from v$sqlarea
         where buffer_gets > 500000
         order by buffer_gets desc)
where rownum <= 30;

-- 执行次数多的SQL
select sql_text, executions
from (select sql_text, executions from v$sqlarea order by executions desc)
where rownum < 81;

-- 读硬盘多的SQL
select sql_text, disk_reads
from (select sql_text, disk_reads from v$sqlarea order by disk_reads desc)
where rownum < 21;

-- 排序多的SQL
select sql_text, sorts
from (select sql_text, sorts from v$sqlarea order by sorts desc)
where rownum < 21;

--分析的次数太多，执行的次数太少，要用绑变量的方法来写sql
set pagesize 600;
set linesize 120;
select substr(sql_text, 1, 80) "sql", count(*), sum(executions) "totexecs"
from v$sqlarea
where executions < 5
group by substr(sql_text, 1, 80)
having count(*) > 30
order by 2;

-- 游标的观察
set pages 300;
select sum(a.value), b.name
from v$sesstat a, v$statname b
where a.statistic# = b.statistic#
   and b.name = 'opened cursors current'
group by b.name;

select count(0) from v$open_cursor;

select user_name, sql_text, count(0)
from v$open_cursor
group by user_name, sql_text
having count(0) > 30;

--查看当前用户&username执行的SQL
select sql_text
from v$sqltext_with_newlines
where (hash_value, address) in
       (select sql_hash_value, sql_address
          from v$session
         where username = '&username')
order by address, piece;

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