使用top工具，找出消耗CPU 较多的进程

 

 

1.使用top工具，找出消耗CPU 较多的进程

[oracle@cuug ~]$ top

 

top - 10:48:27 up 23:15,  4 users,  load average: 1.09, 0.43, 0.15

Tasks: 161 total,   3 running, 158 sleeping,   0 stopped,   0 zombie

Cpu(s): 74.3%us, 23.7%sy,  0.0%ni,  0.0%id,  2.0%wa,  0.0%hi,  0.0%si,  0.0%st

Mem:    900096k total,   894948k used,     5148k free,     6436k buffers

Swap:  2097144k total,    24692k used,  2072452k free,   666588k cached

 

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                                                                                

10306 oracle    25   0  326m 171m 168m R 93.4 19.5   1:51.53 oracle                                                                                                                                 

 3258 oracle    16   0  338m  32m  29m S  3.3  3.7   1:31.02 oracle                                                                                                                                

 3256 oracle    15   0  347m 191m 175m S  1.3 21.8   0:04.65 oracle     

 

可以看到用户ORACLE的进程 为 PID=10306 占用cpu 93.4    

 

2.根据刚才查到的pid 查找数据库中该进程的相关信息

SYS @ prod >select  pid,spid,addr  from  v$process where spid=10306;

 

       PID SPID         ADDR

---------- ------------ --------

        15 10306        2E61B254

 

3.根据查到的pid 查找v$session的相关会话信息

SYS @ prod >select sid,saddr,paddr from v$session where paddr='2E61B254';

 

       SID SADDR    PADDR

---------- -------- --------

       146 2E6FC134 2E61DA40

       147 2E6FD3E8 2E61C370

       150 2E700C04 2E61B254

 

4.根据查到的sid ,查找该会话的 sql_hash_value

SYS @ prod >select sid,SQL_HASH_VALUE from v$session where sid=150;

 

       SID SQL_HASH_VALUE

---------- --------------

       150     3514920902

 

5.根据查到的sql_hash_value,查找对应的sql语句

SYS @ prod >select sql_text from v$sqltext where hash_value='3514920902';

 

SQL_TEXT

----------------------------------------------------------------

declare begin for i in 1..10000000 loop insert into test values( i); end loop;  end;