Oracle %Cpu 100 us

昨天中秋节，本该是团圆的好日子，苦逼的运维我还要值班（哈哈，吐槽一下）本以为会没有啥事，谁知道比较重要的一台Oracle服务器突然报警，CPU 2个core都飙到100%，load average也比较高，如下图：

AWS CloudWatch也可以看出来CPU长期使用率100%

从图可得：系统us比较高，sy基本可以忽略，Memory和IO都已经检查过，不存在瓶颈，根据以往经验，极有可能是Oracle数据库有SQL在长时间运行，并且没有释放，登录到数据库查看，可以看到sid为410，408，404进程执行的都是同一个SQL,

SYS@xxxxxx>SELECT b.sid oracleID,       b.username,       b.serial#,       spid,       paddr,       b.machine,       c.sql_textFROM v$process a, v$session b, v$sqlarea cWHERE a.addr = b.paddr AND b.sql_hash_value = c.hash_value;   ORACLEID USERNAME     SERIAL# SPID      PADDR       MACHINE---------- ------------------------------ ---------- ------------------------ ---------------- ----------------------------------------------------------------SQL_TEXT--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------       410 PRERNAP2 371 16743      00000002DEC84E60 Prernap2-mbrwith cte as(select distinct weekdate, week_month, week_year, SHIPTO, BUYERPARTNUMBER, dense_rank() over(partition by week_year,SHIPTO, BUYERPARTNUMBER, week_month order by weekdate) as rank_week FROM(Select weekdate, to_char(weekdate, 'MM') as week_month,  to_char(weekdate, 'YYYY') as week_year, SHIPTO, BUYERPARTNUMBER from AUTO.ford_forecast_details  ) order by weekdate),  cte1 as (select forecastdate,forecast_month, forecast_year, shipto, buyerpartnumber from (select to_date(forecastdate, 'YYYYMMDD') as forecastdate, TO_CHAR(to_date(forecastdate, 'YYYYMMDD'), 'MM' ) as forecast_month,  TO_CHAR(to_date(forecastdate, 'YYYYMMDD'), 'YYYY' ) as forecast_year,SHIPTO, BUYERPARTNUMBER from AUTO.ford_forecast_details  ) order by forecastdate ),  cte2 as (select cte.shipto, cte.buyerpartnumber,cte.week_month, cte.week_year, max(rank_week) as max_week  from cte group by cte.shipto, cte.buyerpartnumber,cte.week_month, cte.week_year),  cte4 as (select cte2.*, cte1.forecast_month, cte1.forecast_y       408 PRERNAP21163 15129      00000002DEC916A0 Prernap2-mbrwith cte as(select distinct weekdate, week_month, week_year, SHIPTO, BUYERPARTNUMBER, dense_rank() over(partition by week_year,SHIPTO, BUYERPARTNUMBER, week_month order by weekdate) as rank_week FROM(Select weekdate, to_char(weekdate, 'MM') as week_month,  to_char(weekdate, 'YYYY') as week_year, SHIPTO, BUYERPARTNUMBER from AUTO.ford_forecast_details  ) order by weekdate),  cte1 as (select forecastdate,forecast_month, forecast_year, shipto, buyerpartnumber from (select to_date(forecastdate, 'YYYYMMDD') as forecastdate, TO_CHAR(to_date(forecastdate, 'YYYYMMDD'), 'MM' ) as forecast_month,  TO_CHAR(to_date(forecastdate, 'YYYYMMDD'), 'YYYY' ) as forecast_year,SHIPTO, BUYERPARTNUMBER from AUTO.ford_forecast_details  ) order by forecastdate ),  cte2 as (select cte.shipto, cte.buyerpartnumber,cte.week_month, cte.week_year, max(rank_week) as max_week  from cte group by cte.shipto, cte.buyerpartnumber,cte.week_month, cte.week_year),  cte4 as (select cte2.*, cte1.forecast_month, cte1.forecast_y18 PRERNAP2 311 19710      00000002DEC948B0 Prernap2-mbrwith cte as(select distinct weekdate, week_month, week_year, SHIPTO, BUYERPARTNUMBER, dense_rank() over(partition by week_year,SHIPTO, BUYERPARTNUMBER, week_month order by weekdate) as rank_week FROM(Select weekdate, to_char(weekdate, 'MM') as week_month,  to_char(weekdate, 'YYYY') as week_year, SHIPTO, BUYERPARTNUMBER from AUTO.ford_forecast_details  ) order by weekdate),  cte1 as (select forecastdate,forecast_month, forecast_year, shipto, buyerpartnumber from (select to_date(forecastdate, 'YYYYMMDD') as forecastdate, TO_CHAR(to_date(forecastdate, 'YYYYMMDD'), 'MM' ) as forecast_month,  TO_CHAR(to_date(forecastdate, 'YYYYMMDD'), 'YYYY' ) as forecast_year,SHIPTO, BUYERPARTNUMBER from AUTO.ford_forecast_details  ) order by forecastdate ),  cte2 as (select cte.shipto, cte.buyerpartnumber,cte.week_month, cte.week_year, max(rank_week) as max_week  from cte group by cte.shipto, cte.buyerpartnumber,cte.week_month, cte.week_year),  cte4 as (select cte2.*, cte1.forecast_month, cte1.forecast_y       404 PRERNAP2 665 21911      00000002DEC95960 Prernap2-mbrwith cte as( select distinct weekdate, week_month, week_year, SHIPTO, BUYERPARTNUMBER, dense_rank() over(partition by week_year,SHIPTO, BUYERPARTNUMBER, week_month order by weekdate) as rank_week FROM (Select weekdate, to_char(weekdate, 'MM') as week_month,  to_char(weekdate, 'YYYY') as week_year, SHIPTO, BUYERPARTNUMBER from AUTO.ford_forecast_details  ) order by weekdate ),  cte1 as ( select forecastdate,forecast_month, forecast_year, shipto, buyerpartnumber from (select to_date(forecastdate, 'YYYYMMDD') as forecastdate, TO_CHAR(to_date(forecastdate, 'YYYYMMDD'), 'MM' ) as forecast_month,  TO_CHAR(to_date(forecastdate, 'YYYYMMDD'), 'YYYY' ) as forecast_year,SHIPTO, BUYERPARTNUMBER from AUTO.ford_forecast_details  ) order by forecastdate ),  cte2 as ( select cte.shipto, cte.buyerpartnumber,cte.week_month, cte.week_year, max(rank_week) as max_week ,  cte1.forecast_month, cte1.forecast_year from cte inner join cte1 on cte1.forecast_year>=cte.week_year  and cte.shipto = cte1.shipto and c22 SYS 447 23888      00000002DEC96A10 ec2-admart-01SELECT b.sid oracleID,      b.username, b.serial#,   spid,paddr,      b.machine,c.sql_text FROM v$process a, v$session b, v$sqlarea c WHERE a.addr = b.paddrAND b.sql_hash_value = c.hash_value       387 PRERNAP2 313 24261      00000002DEC97AC0 Prernap2-mbrwith cte as( select distinct weekdate, week_month, week_year, SHIPTO, BUYERPARTNUMBER, dense_rank() over(partition by week_year,SHIPTO, BUYERPARTNUMBER, week_month order by weekdate) as rank_week FROM (Select weekdate, to_char(weekdate, 'MM') as week_month,  to_char(weekdate, 'YYYY') as week_year, SHIPTO, BUYERPARTNUMBER from AUTO.ford_forecast_details  ) order by weekdate ),  cte1 as ( select forecastdate,forecast_month, forecast_year, shipto, buyerpartnumber from (select to_date(forecastdate, 'YYYYMMDD') as forecastdate, TO_CHAR(to_date(forecastdate, 'YYYYMMDD'), 'MM' ) as forecast_month,  TO_CHAR(to_date(forecastdate, 'YYYYMMDD'), 'YYYY' ) as forecast_year,SHIPTO, BUYERPARTNUMBER from AUTO.ford_forecast_details  ) order by forecastdate ),  cte2 as ( select cte.shipto, cte.buyerpartnumber,cte.week_month, cte.week_year, max(rank_week) as max_week ,  cte1.forecast_month, cte1.forecast_year from cte inner join cte1 on cte1.forecast_year>=cte.week_year  and cte.shipto = cte1.shipto and c6 rows selected.SYS@xxxxxx>select b.sid,b.serial#,b.machine,b.terminal,b.program,b.process,b.statusfrom v$lock a, v$session b where a.SID = b.SID and username is not null and username not in ('SYS','SYSTEM');       SID    SERIAL# MACHINE                                                              TERMINAL                       PROGRAM                                            PROCESS                       STATUS---------- ---------- ---------------------------------------------------------------- ------------------------------ ------------------------------------------------ ------------------------ --------       387     313 Prernap2-mbr                                                      unknown                             SQL Developer                                 6246                  ACTIVE       387     313 Prernap2-mbr                                                      unknown                             SQL Developer                                 6246                  ACTIVE       404     665 Prernap2-mbr                                                      unknown                             SQL Developer                                 4145                  ACTIVE       387     313 Prernap2-mbr                                                      unknown                             SQL Developer                                 6246                  ACTIVE       387     313 Prernap2-mbr                                                      unknown                             SQL Developer                                 6246                  ACTIVE       408    1163 Prernap2-mbr                                                   unknown                             SQL Developer                                 3377                  ACTIVE       387     313 Prernap2-mbr                                                      unknown                             SQL Developer                                 6246                  ACTIVE       387     313 Prernap2-mbr                                                      unknown                             SQL Developer                                 6246                  ACTIVE       404     665 Prernap2-mbr                                                      unknown                             SQL Developer                                 4145                  ACTIVE       408    1163 Prernap2-mbr                                                   unknown                             SQL Developer                                 3377                  ACTIVE       410     371 Prernap2-mbr                                                      unknown                             SQL Developer                                 5691                  ACTIVE        18        311 Prernap2-mbr                                                      unknown                             SQL Developer                                 1497                  ACTIVE        20        221 Prernap2-mbr                                                      unknown                             SQL Developer                                 4689                  ACTIVE        20        221 Prernap2-mbr                                                      unknown                             SQL Developer                                 4689                  ACTIVE       387     313 Prernap2-mbr                                                      unknown                             SQL Developer                                 6246                  ACTIVE15 rows selected.SYS@xxxxxx>select sid, username, blocking_session from v$session where blocking_session is not null;       SID USERNAME                       BLOCKING_SESSION---------- ------------------------------ ----------------        18 PRERNAP2                                       408       387 PRERNAP2                                    404       410 PRERNAP2                                    408SYS@xxxxxx>select sid, serial#, username from v$session where sid='410';       SID    SERIAL# USERNAME---------- ---------- ------------------------------       410     371 PRERNAP2

解决方法

找到开发人员，询问原因，得到的反馈是在测试几条SQL（我擦，竟然在生产环境测试SQL,哎，一点敬畏之心都没有，可怕！）

kill掉blocked的进程，释放资源，再这么跑下去，系统随时可能崩溃，最后去优化一下的SQL,再去执行

alter system kill session '410,371';

......其他几个进程同理干掉即可