【Oracle】网上一些实用脚本归纳

系统管理员 2022-08-18 14:20 168阅读 0赞

1 查找当前表级锁的SQL如下：

select sess.sid, 
        sess.serial#, 
        lo.oracle_username, 
        lo.os_user_name, 
        ao.object_name, 
        lo.locked_mode 
    from v$locked_object lo, 
        dba_objects ao, 
        v$session sess 
    where ao.object_id = lo.object_id 
    	and lo.session_id = sess.sid;

2 杀掉锁表进程：

alter system kill session '436,35123';

3 RAC环境中锁查找：

SELECT inst_id,
    		DECODE(request,0,'Holder: ','Waiter: ')||sid sess, 
    		id1, 
    		id2, 
    		lmode, 
    		request, 
    		type,
    		block,
    		ctime
    FROM GV$LOCK
    WHERE (id1, id2, type) IN
           (SELECT id1, id2, type FROM GV$LOCK WHERE request>0)
    ORDER BY id1, request;

4 监控当前数据库谁在运行什么SQL语句

select osuser, 
    		username, 
    		sql_text  
    from  v$session a, v$sqltext b 
    where  a.sql_address =b.address 
    order by address, piece;

5 找使用CPU多的用户session

select a.sid,
    		spid,
    		status,
    		substr(a.program,1,40) prog,
    		a.terminal,
    		osuser,
    		value/60/100 value 
    from  v$session a,v$process b,v$sesstat c 
    where  c.statistic#=12 and 
           c.sid=a.sid and  
           a.paddr=b.addr  
    order by value desc;

6 查看死锁信息

SELECT (SELECT username
              FROM v$session
             WHERE SID = a.SID) blocker, a.SID, 'is blocking',
           (SELECT username
              FROM v$session
             WHERE SID = b.SID) blockee, b.SID
    FROM v$lock a, v$lock b
    WHERE a.BLOCK = 1 
    	AND b.request > 0 
    	AND a.id1 = b.id1 
    	AND a.id2 = b.id2;

7 具有最高等待的对象

SELECT o.OWNER,
    		o.object_name, 
    		o.object_type, 
    		a.event,
            SUM (a.wait_time + a.time_waited) total_wait_time
    FROM v$active_session_history a, dba_objects o
    WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE
         AND a.current_obj# = o.object_id
    GROUP BY o.OWNER,o.object_name, o.object_type, a.event
    ORDER BY total_wait_time DESC;

SELECT a.session_id, 
    		s.osuser, 
    		s.machine, 
    		s.program, 
    		o.owner, 
    		o.object_name,
    		o.object_type, 
    		a.event,
    		SUM (a.wait_time + a.time_waited) total_wait_time
    FROM v$active_session_history a, dba_objects o, v$session s
    WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE
         AND a.current_obj# = o.object_id
         AND a.session_id = s.SID
    GROUP BY o.owner,
             o.object_name,
             o.object_type,
             a.event,
             a.session_id,
             s.program,
             s.machine,
             s.osuser
    ORDER BY total_wait_time DESC;

8 查询当前连接会话数

select s.value,
    		s.sid,
    		a.username
    from v$sesstat S,v$statname N,v$session A
    where n.statistic#=s.statistic# 
    	and name='session pga memory'
    	and s.sid=a.sid
    order by s.value;

9 等待最多的用户

SELECT s.SID, 
    		s.username, 
    		SUM (a.wait_time + a.time_waited) total_wait_time
    FROM v$active_session_history a, v$session s
    WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE
    GROUP BY s.SID, s.username
    ORDER BY total_wait_time DESC;

10 等待最多的SQL

SELECT a.program, 
    		a.session_id, 
    		a.user_id, 
    		d.username, 
    		s.sql_text,
            SUM (a.wait_time + a.time_waited) total_wait_time
    FROM v$active_session_history a, v$sqlarea s, dba_users d
    WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE
         AND a.sql_id = s.sql_id
         AND a.user_id = d.user_id
    GROUP BY a.program, a.session_id, a.user_id, s.sql_text, d.username;

11 查看消耗资源最多的SQL

SELECT hash_value, 
    		executions, 
    		buffer_gets, 
    		disk_reads,
    		parse_calls
    FROM V$SQLAREA
    WHERE buffer_gets > 10000000 OR disk_reads > 1000000
    ORDER BY buffer_gets + 100 * disk_reads DESC;

12 查看某条SQL语句的资源消耗

SELECT hash_value,
    		buffer_gets,
    		disk_reads,
    		executions,
    		parse_calls
    FROM V$SQLAREA
    WHERE hash_Value = 228801498 
    	AND address = hextoraw('CBD8E4B0');

13 查询会话执行的实际SQL

SELECT a.SID,
    		a.username,
    		s.sql_text
    FROM v$session a, v$sqltext s
    WHERE a.sql_address = s.address
         AND a.sql_hash_value = s.hash_value
         AND a.status = 'ACTIVE'
    ORDER BY a.username, a.SID, s.piece;

14 显示正在等待锁的所有会话

SELECT * FROM DBA_WAITERS;

15 查询表空间使用情况

SELECT UPPER(F.TABLESPACE_NAME) "表空间名",
    　　D.TOT_GROOTTE_MB "表空间大小(M)",
    　　D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空间(M)",
    　　TO_CHAR(ROUND((D.TOT_GROOTTE_MB - F.TOTAL_BYTES) / D.TOT_GROOTTE_MB * 100,2),'990.99') || '%' "使用比",
    　　F.TOTAL_BYTES "空闲空间(M)",
    　　F.MAX_BYTES "最大块(M)"
    FROM (SELECT TABLESPACE_NAME,
    	　　ROUND(SUM(BYTES) / (1024 * 1024), 2) TOTAL_BYTES,
    	　　ROUND(MAX(BYTES) / (1024 * 1024), 2) MAX_BYTES
    　　   FROM SYS.DBA_FREE_SPACE
    	   GROUP BY TABLESPACE_NAME) F,
    　　  (SELECT DD.TABLESPACE_NAME,
    	　　 ROUND(SUM(DD.BYTES) / (1024 * 1024), 2) TOT_GROOTTE_MB
    	  FROM SYS.DBA_DATA_FILES DD
    　　   GROUP BY DD.TABLESPACE_NAME) D
    WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME
    ORDER BY 1;

16 查询表空间的free space

select tablespace_name,
    　　count(*) as extends,
    　　round(sum(bytes) / 1024 / 1024, 2) as MB,
    　　sum(blocks) as blocks
    from dba_free_space
    group by tablespace_name;

17 查询表空间的总容量

select tablespace_name, sum(bytes) / 1024 / 1024 as MB
    from dba_data_files
    group by tablespace_name;

18 查询表空间使用率

select total.tablespace_name,
    　　round(total.MB, 2) as Total_MB,
    　　round(total.MB - free.MB, 2) as Used_MB,
    　　round((1 - free.MB / total.MB) * 100, 2) || '%' as Used_Pct
    from (select tablespace_name, sum(bytes) / 1024 / 1024 as MB
    	　　from dba_free_space
    	　　group by tablespace_name) free,
    　　  (select tablespace_name, sum(bytes) / 1024 / 1024 as MB
    	　　from dba_data_files
    	　　group by tablespace_name) total
    where free.tablespace_name = total.tablespace_name;

19 查询数据库最大连接数

select value from v$parameter where name = 'processes';