### 查看操作系统负载
    登上数据库服务器后，第一个就是通过系统命令确认下CPU、内存、I/O是否异常，每个系统的命令不一样，常见的有top、topas、vmstat、iostat
### 查看等待事件
```
--wait_event
col event for a45
SELECT  inst_id,EVENT, SUM(DECODE(WAIT_TIME, 0, 0, 1)) "Prev", 
SUM(DECODE(WAIT_TIME, 0, 1, 0)) "Curr", COUNT(*) "Tot" , 
sum(SECONDS_IN_WAIT) SECONDS_IN_WAIT
FROM GV$SESSION_WAITWHERE event 
NOT IN ('smon timer','pmon timer','rdbms ipc message','SQL*Net message from client',
'gcs remote message')   
AND event NOT LIKE '%idle%'    AND event NOT LIKE '%Idle%'    
AND event NOT LIKE '%Streams AQ%'GROUP BY inst_id,EVENTORDER BY 1,5 desc;
```

### 根据等待事件查会话
```
--session_by_event
SELECT /*+rule */ sid, s.serial#, spid, event, sql_id, seconds_in_wait ws, row_wait_obj# obj,
s.username, s.machine, BLOCKING_INSTANCE||'.'||blocking_session b_sess 
FROM v$session s, v$process p WHERE event='&event_name' AND s.paddr = p.addr order by 6;
```

### 查询某个会话详情
```
--session_by_sid
SELECT s.sid, s.serial#, spid, event, sql_id, PREV_SQL_ID, seconds_in_wait ws, 
row_wait_obj# obj,s.username, s.machine, module,blocking_session b_sess,logon_time  
FROM v$session s, v$process p WHERE sid = '&sid' AND s.paddr = p.addr;
```

### 查询对象信息
```
--obj_info
col OBJECT_NAME for a30
select owner,object_name,subobject_name,object_type from dba_objects where object_id=&oid;
```

### 查询SQL语句信息
```
--sql_text
select sql_id,SQL_fullTEXT 
from v$sqlarea --DBA_HIST_SQLTEXT
where (sql_id='&sqlid' or hash_value=to_number('&hashvale') ) and rownum<2;
```

###查询会话阻塞情况
```
--blocking_sess
select count(*),blocking_session 
from v$session where blocking_session is not null group by blocking_session;
```

### 查询数据库的锁
```
--lockset 
linesize 180
col username for a15
col owner for a15
col OBJECT_NAME for a30
col SPID for a10
--查询某个会话的锁
select /*+rule*/SESSION_ID,OBJECT_ID,ORACLE_USERNAME,OS_USER_NAME,PROCESS,LOCKED_MODE 
from gv$locked_object where session_id=&sid;
--查询TM、TX锁
select /*+rule*/* from v$lock where ctime >100 and type in ('TX','TM') order by 3,9;
--查询数据库中的锁
select /*+rule*/s.sid,p.spid,l.type,round(max(l.ctime)/60,0) lock_min,
s.sql_id,s.USERNAME,b.owner,b.object_type,b.object_name 
from v$session s, v$process p,v$lock l,v$locked_object o,dba_objects b 
where  o.SESSION_ID=s.sid and s.sid=l.sid and o.OBJECT_ID=b.OBJECT_ID 
and s.paddr = p.addr and l.ctime >100 and l.type in ('TX','TM','FB') 
group by s.sid,p.spid,l.type,s.sql_id,s.USERNAME,b.owner,b.object_type,b.object_name 
order by 9,1,3;
```

### 保留现场证据
```
--systemstate dump
sqlplus -prelim / as sysdba
oradebug setmypid
oradebug unlimit;
oradebug dump systemstate 266;
--wait for 1 min
oradebug dump systemstate 266;
--wait for 1 min
oradebug dump systemstate 266;
oradebug tracefile_name;
--hanganalyze
oradebug setmypid
oradebug unlimit;
oradebug dump hanganalyze 3
--wait for 1 min
oradebug dump hanganalyze 3
--wait for 1 min
oradebug dump hanganalyze 3
oradebug tracefile_name
```
## 杀会话
```
--kill_sess
set line 199
col event format a35
--杀某个SID会话
SELECT /*+ rule */ sid, s.serial#, 'kill -9 '||spid, event, blocking_session b_sess 
FROM v$session s, v$process p WHERE sid='&sid' AND s.paddr = p.addr order by 1;
--根据SQL_ID杀会话
SELECT /*+ rule */ sid, s.serial#, 'kill -9 '||spid, event, blocking_session b_sess 
FROM v$session s, v$process p WHERE sql_id='&sql_id' AND s.paddr = p.addr order by 1;
--根据等待事件杀会话
SELECT /*+ rule */ sid, s.serial#, 'kill -9 '||spid, event, blocking_session b_sess 
FROM v$session s, v$process p WHERE event='&event' AND s.paddr = p.addr order by 1;
--根据用户杀会话
SELECT /*+ rule */ sid, s.serial#, 'kill -9 '||spid, event, blocking_session b_sess 
FROM v$session s, v$process p WHERE username='&username' AND s.paddr = p.addr order by 1;
--kill所有LOCAL=NO进程
ps -ef|grep LOCAL=NO|grep $ORACLE_SID|grep -v grep|awk '{print $2}' | xargs kill -9
```

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