查找消耗资源多的sql
1 通过top监控操作系统负载发现：
top
top - 09:17:15 up 43 days, 18:51, 5 users, load average: 38.78, 37.45, 28.53
Tasks: 391 total, 44 running, 346 sleeping, 0 stopped, 1 zombie
Cpu(s): 95.8%us, 3.1%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 1.1%si, 0.0%st
Mem: 16336460k total, 15764084k used, 572376k free, 71200k buffers
Swap: 17591288k total, 1132188k used, 16459100k free, 12091484k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
10840 oracle 20 0 12.3g 321m 313m R 9.8 2.0 34:42.91 oracle
10856 oracle 20 0 12.3g 640m 631m R 9.5 4.0 33:49.30 oracle
11341 oracle 20 0 12.3g 626m 622m R 9.5 3.9 4:13.94 oracle
11369 oracle 20 0 12.3g 626m 616m R 9.5 3.9 4:23.53 oracle
11524 oracle 20 0 12.3g 610m 606m R 9.5 3.8 1:39.00 oracle
11534 oracle 20 0 12.3g 291m 287m R 9.5 1.8 1:32.16 oracle
11625 oracle 20 0 12.3g 474m 469m R 9.5 3.0 0:57.79 oracle
11643 oracle 20 0 12.3g 288m 283m R 9.5 1.8 1:06.34 oracle
11260 oracle 20 0 12.3g 654m 649m R 9.1 4.1 5:18.50 oracle
11351 oracle 20 0 12.3g 1.0g 1.0g R 9.1 6.6 5:30.35 oracle
11639 oracle 20 0 12.3g 448m 444m R 9.1 2.8 1:09.25 oracle
11681 oracle 20 0 12.3g 274m 270m R 9.1 1.7 0:40.24 oracle
10713 oracle 20 0 12.3g 786m 777m R 8.8 4.9 34:02.16 oracle
11237 oracle 20 0 12.3g 730m 726m R 8.8 4.6 6:43.29 oracle
11262 oracle 20 0 12.3g 651m 647m R 8.8 4.1 5:03.98 oracle
11331 oracle 20 0 12.3g 589m 581m R 8.8 3.7 3:27.44 oracle
11563 oracle 20 0 12.3g 319m 315m R 8.8 2.0 1:38.29 oracle
11569 oracle 20 0 12.3g 494m 490m R 8.8 3.1 1:09.75 oracle
11605 oracle 20 0 12.3g 283m 279m R 8.8 1.8 1:26.11 oracle
11607 oracle 20 0 12.3g 229m 226m R 8.8 1.4 1:20.35 oracle
11663 oracle 20 0 12.3g 285m 281m R 8.8 1.8 0:47.90 oracle
11665 oracle 20 0 12.3g 495m 490m R 8.8 3.1 0:22.92 oracle
11667 oracle 20 0 12.3g 517m 514m R 8.8 3.2 0:36.17 oracle
11730 oracle 20 0 12.3g 226m 222m R 8.8 1.4 0:22.71 oracle
11744 oracle 20 0 12.3g 179m 175m R 8.8 1.1 0:23.03 oracle
11276 oracle 20 0 12.3g 761m 756m R 8.5 4.8 4:32.40 oracle
11347 oracle 20 0 12.3g 694m 689m R 8.5 4.4 3:49.45 oracle
11498 oracle 20 0 12.3g 570m 566m R 8.5 3.6 2:09.96 oracle
11567 oracle 20 0 12.3g 298m 294m R 8.5 1.9 1:13.86 oracle
11645 oracle 20 0 12.3g 556m 552m R 8.5 3.5 1:00.15 oracle
11683 oracle 20 0 12.3g 460m 456m R 8.5 2.9 0:28.87 oracle
11726 oracle 20 0 12.3g 158m 155m R 8.5 1.0 0:28.52 oracle
11746 oracle 20 0 12.3g 234m 230m R 8.5 1.5 0:23.50 oracle
11222 oracle 20 0 12.3g 638m 632m R 8.2 4.0 5:41.07 oracle
11466 oracle 20 0 12.3g 542m 538m R 8.2 3.4 2:55.76 oracle
通过top监控到数据库CPU使用率达到了95%以上，并且都是oracle进程
select sql_text from v$process pr,v$session ss,v$sqlarea sl where pr.addr=ss.PADDR and ss.SQL_HASH_VALUE=sl.HASH_VALUE and pr.spid=10840; select sql_text from v$process pr,v$session ss,v$sqlarea sl where pr.addr=ss.PADDR and ss.SQL_HASH_VALUE=sl.HASH_VALUE and pr.spid=10856; select sql_text from v$process pr,v$session ss,v$sqlarea sl where pr.addr=ss.PADDR and ss.SQL_HASH_VALUE=sl.HASH_VALUE and pr.spid=11341; select sql_text from v$process pr,v$session ss,v$sqlarea sl where pr.addr=ss.PADDR and ss.SQL_HASH_VALUE=sl.HASH_VALUE and pr.spid=11369; select sql_text from v$process pr,v$session ss,v$sqlarea sl where pr.addr=ss.PADDR and ss.SQL_HASH_VALUE=sl.HASH_VALUE and pr.spid=11524; select sql_text from v$process pr,v$session ss,v$sqlarea sl where pr.addr=ss.PADDR and ss.SQL_HASH_VALUE=sl.HASH_VALUE and pr.spid=11534; select sql_text from v$process pr,v$session ss,v$sqlarea sl where pr.addr=ss.PADDR and ss.SQL_HASH_VALUE=sl.HASH_VALUE and pr.spid=11625; select sql_text from v$process pr,v$session ss,v$sqlarea sl where pr.addr=ss.PADDR and ss.SQL_HASH_VALUE=sl.HASH_VALUE and pr.spid=11643;发现占用资源较高的进程所执行的sql语句