今天遇到一起ORACLE数据库宕机案例，下面是对这起数据库宕机案例的原因进行分析、解读。分析过程中顺便记录一下这个案例的前因后果，攒点经验值，培养一下分析、解决问题的能力。
案例环境：
操作系统 ：Oracle Linux Server release 5.7 64 bit
数据库版本：Oracle Database 10g Release 10.2.0.4.0 - 64bit Production
案例分析：
收到告警去检查数据库时，发现实例已经宕机。检查告警日志，发现下面错误信息：
ORA-00604: error occurred at recursive SQL level 1
ORA-04031: unable to allocate 32 bytes of shared memory ("shared pool","select count(*) from sys.job...","sql area","tmp")
Mon Nov 2 11:43:00 2015
Errors in file /u01/app/oracle/admin/SCM2/bdump/scm2_cjq0_6571.trc:
ORA-00604: error occurred at recursive SQL level 1
ORA-04031: unable to allocate 32 bytes of shared memory ("shared pool","select job, nvl2(last_date, ...","sql area","tmp")
Mon Nov 2 11:43:00 2015
Errors in file /u01/app/oracle/admin/SCM2/bdump/scm2_cjq0_6571.trc:
ORA-00604: error occurred at recursive SQL level 1
ORA-04031: unable to allocate 32 bytes of shared memory ("shared pool","select count(*) from sys.job...","sql area","tmp")
Mon Nov 2 11:43:05 2015
Errors in file /u01/app/oracle/admin/SCM2/bdump/scm2_cjq0_6571.trc:
ORA-00604: error occurred at recursive SQL level 1
ORA-04031: unable to allocate 32 bytes of shared memory ("shared pool","select job, nvl2(last_date, ...","sql area","tmp")
Mon Nov 2 11:43:05 2015
Errors in file /u01/app/oracle/admin/SCM2/bdump/scm2_cjq0_6571.trc:
ORA-00604: error occurred at recursive SQL level 1
ORA-04031: unable to allocate 32 bytes of shared memory ("shared pool","select count(*) from sys.job...","sql area","tmp")
Mon Nov 2 11:43:08 2015
Errors in file /u01/app/oracle/admin/SCM2/bdump/scm2_reco_6569.trc:
ORA-04031: unable to allocate 32 bytes of shared memory ("shared pool","select host,userid,password,...","sql area","tmp")
Mon Nov 2 11:43:08 2015
RECO: terminating instance due to error 4031
Mon Nov 2 11:43:08 2015
Errors in file /u01/app/oracle/admin/SCM2/bdump/scm2_pmon_6555.trc:
ORA-04031: unable to allocate bytes of shared memory ("","","","")
Instance terminated by RECO, pid = 6569