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Oracle中捕获问题SQL解决CPU过渡消耗(2) 116 0 0 5338192 1495400 177 1162 0 0 0 0 0 0 0 1 0 1947 7781 1639 97 3 0
2.使用Top命令
观察进程CPU耗用,发现没有明显过高CPU使用的进程
$ top
last pid: 28313; load averages: 99.90, 117.54, 125.71 23:28:38
296 processes: 186 sleeping, 99 running, 2 zombie, 9 on cpu
CPU states: 0.0% idle, 96.5% user, 3.5% kernel, 0.0% iowait, 0.0% swap
Memory: 4096M real, 1404M free, 2185M swap in use, 5114M swap free
PID USERNAME THR PRI NICE SIZE RES STATE TIME CPU COMMAND
27082 oracle8i 1 33 0 1328M 1309M run 0:17 1.29% oracle
26719 oracle8i 1 55 0 1327M 1306M sleep 0:29 1.11% oracle
28103 oracle8i 1 35 0 1327M 1304M run 0:06 1.10% oracle
28161 oracle8i 1 25 0 1327M 1305M run 0:04 1.10% oracle
26199 oracle8i 1 45 0 1328M 1309M run 0:42 1.10% oracle
26892 oracle8i 1 33 0 1328M 1310M run 0:24 1.09% oracle
27805 oracle8i 1 45 0 1327M 1306M cpu/1 0:10 1.04% oracle
23800 oracle8i 1 23 0 1327M 1306M run 1:28 1.03% oracle
25197 oracle8i 1 34 0 1328M 1309M run 0:57 1.03% oracle
21593 oracle8i 1 33 0 1327M 1306M run 2:12 1.01% oracle
27616 oracle8i 1 45 0 1329M 1311M run 0:14 1.01% oracle
27821 oracle8i 1 43 0 1327M 1306M run 0:10 1.00% oracle
26517 oracle8i 1 33 0 1328M 1309M run 0:33 0.97% oracle
25785 oracle8i 1 44 0 1328M 1309M run 0:46 0.96% oracle
26241 oracle8i 1 45 0 1327M 1306M run 0:42 0.96% oracle
3.检查进程数量
bash-2.03$ ps -efgrep orawc -l
258
bash-2.03$ ps -efgrep orawc -l
275
bash-2.03$ ps -efgrep orawc -l
274
bash-2.03$ ps -efgrep orawc -l
278
bash-2.03$ ps -efgrep orawc -l
277
bash-2.03$ ps -efgrep orawc -l
366
发现系统存在大量Oracle进程,大约在300左右，大量进程消耗了几乎所有CPU资源,而正常情况下Oracle连接数应该在100左右.
4.检查数据库
查询v$session_wait获取各进程等待事件
SQL> select sid,event,p1,p1text from v$session_wait;
SID EVENT P1 P1TEXT
---------- ------------------------------ ---------- ----------------------------------------------------------------
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