[原]记一次处理Oracle死会话的过程

# top -u oracle
top - 22:24:54 up 186 days,  6:50,  4 users,  load average: 2.57, 2.53, 2.33
Tasks: 179 total,   2 running, 177 sleeping,   0 stopped,   0 zombie
Cpu0  :  0.3% us,  0.0% sy,  0.0% ni, 98.3% id,  1.3% wa,  0.0% hi,  0.0% si
Cpu1  : 16.9% us,  6.0% sy,  0.0% ni,  0.0% id, 77.1% wa,  0.0% hi,  0.0% si
Cpu2  : 73.8% us, 24.5% sy,  0.0% ni,  1.7% id,  0.0% wa,  0.0% hi,  0.0% si
Cpu3  :  2.7% us,  0.3% sy,  0.0% ni, 94.0% id,  3.0% wa,  0.0% hi,  0.0% si
Mem:   8165004k total,  8124392k used,    40612k free,     7520k buffers
Swap:  2031608k total,   113680k used,  1917928k free,  6181492k cached

PID USER      PR  NI %CPU    TIME+  %MEM  VIRT  RES  SHR S COMMAND
21752 oracle    25   0   99  37633:19 12.2 2187m 970m 963m R oracle
27111 oracle    15   0    4   3720:27  4.1 2205m 324m 307m D oracle
2045 oracle    16   0    0   0:01.29  0.8 2184m  67m  61m S oracle
5456 oracle    16   0    0   0:00.04  0.2 2182m  16m  12m S oracle
6057 oracle    16   0    0   4:30.34  0.1 65188   9m 6236 S tnslsnr

从top可以看到PID为21752的进程占用了很多的CPU，而运行的时间很长了。

使用以下语句找出对应的会话：

sys$mydb@mailserver SQL>]exec sys.dbms_system.set_sql_trace_in_session(129,12900,true);
-- 等一段时间
exec sys.dbms_system.set_sql_trace_in_session(129,12900,false);


郁闷的是竟然没有生成一个trc文件。

再看看该会话正在跑的SQL：

sys$mydb@mailserver SQL> alter system kill session '&sid,&serial' ;
Enter value for sid: 129
Enter value for serial: 12900
old   1: alter system kill session '&sid,&serial'
new   1: alter system kill session '129,12900'

System altered.

Elapsed: 00:00:01.02


再用top看一下：

[root@mailserver ~]# top -u oracle
top - 22:54:55 up 186 days,  7:20,  4 users,  load average: 0.63, 0.96, 1.23
Tasks: 186 total,   1 running, 185 sleeping,   0 stopped,   0 zombie
Cpu0  :  0.0% us,  0.0% sy,  0.0% ni, 100.0% id,  0.0% wa,  0.0% hi,  0.0% si
Cpu1  :  1.7% us,  0.0% sy,  0.0% ni, 90.0% id,  8.3% wa,  0.0% hi,  0.0% si
Cpu2  :  0.0% us,  0.0% sy,  0.0% ni, 100.0% id,  0.0% wa,  0.0% hi,  0.0% si
Cpu3  :  0.0% us,  0.0% sy,  0.0% ni, 100.0% id,  0.0% wa,  0.0% hi,  0.0% si
Mem:   8165004k total,  8102144k used,    62860k free,    16052k buffers
Swap:  2031608k total,   113440k used,  1918168k free,  6208748k cached

PID USER      PR  NI %CPU    TIME+  %MEM  VIRT  RES  SHR S COMMAND
2045 oracle    16   0    0   0:01.29  0.8 2184m  67m  61m S oracle
5456 oracle    16   0    0   0:00.04  0.2 2182m  16m  12m S oracle
6057 oracle    16   0    0   4:30.39  0.1 65188   9m 6236 S tnslsnr
6652 oracle    16   0    0   0:59.26  0.1  7800 6224 1556 S perl