分类： Oracle
2013-02-01 10:37:51
dba培训http://www.cuug.com/一.检查CKPT进程的跟踪文件
我们可以很容易的发现CKPT进程每3秒都对控制文件进行一次写入
[oracle@jumper bdump]$ tail -f conner_ckpt_2563.trc WAIT #0: nam='rdbms ipc message' ela= 2994710 p1=300 p2=0 p3=0WAIT #0: nam='control file parallel write' ela= 2442 p1=3 p2=3 p3=3WAIT #0: nam='rdbms ipc message' ela= 2995171 p1=300 p2=0 p3=0WAIT #0: nam='control file parallel write' ela= 2586 p1=3 p2=3 p3=3WAIT #0: nam='rdbms ipc message' ela= 2994962 p1=300 p2=0 p3=0WAIT #0: nam='control file parallel write' ela= 2582 p1=3 p2=3 p3=3WAIT #0: nam='rdbms ipc message' ela= 2995020 p1=300 p2=0 p3=0WAIT #0: nam='control file parallel write' ela= 2455 p1=3 p2=3 p3=3WAIT #0: nam='rdbms ipc message' ela= 2995188 p1=300 p2=0 p3=0WAIT #0: nam='control file parallel write' ela= 2412 p1=3 p2=3 p3=3WAIT #0: nam='rdbms ipc message' ela= 2995187 p1=300 p2=0 p3=0WAIT #0: nam='control file parallel write' ela= 2463 p1=3 p2=3 p3=3WAIT #0: nam='rdbms ipc message' ela= 2995095 p1=300 p2=0 p3=0WAIT #0: nam='control file parallel write' ela= 2448 p1=3 p2=3 p3=3
二.检查控制文件的变更
通过2次dump控制文件，比较其trace文件输出可以比较得到不同之处，我们发现，Oracle仅仅更新了Heartbeat这个数值。
[oracle@jumper udump]$ sqlplus "/ as sysdba"
SQL*Plus: Release 9.2.0.4.0 - Production on Wed Jan 18 22:44:10 2006
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Connected to:Oracle9i Enterprise Edition Release 9.2.0.4.0 - ProductionWith the Partitioning optionJServer Release 9.2.0.4.0 - Production
SQL> alter session set events 'immediate trace name CONTROLF level 10';
Session altered.
SQL> exitDisconnected from Oracle9i Enterprise Edition Release 9.2.0.4.0 - ProductionWith the Partitioning optionJServer Release 9.2.0.4.0 - Production[oracle@jumper udump]$ sqlplus "/ as sysdba"
SQL*Plus: Release 9.2.0.4.0 - Production on Wed Jan 18 22:44:18 2006
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Connected to:Oracle9i Enterprise Edition Release 9.2.0.4.0 - ProductionWith the Partitioning optionJServer Release 9.2.0.4.0 - Production
SQL> alter session set events 'immediate trace name CONTROLF level 10' ;
Session altered.
SQL> exitDisconnected from Oracle9i Enterprise Edition Release 9.2.0.4.0 - ProductionWith the Partitioning optionJServer Release 9.2.0.4.0 - Production
[oracle@jumper udump]$ lsconner_ora_21896.trc conner_ora_21898.trc[oracle@jumper udump]$ diff conner_ora_21896.trc conner_ora_21898.trc 1c1< /opt/oracle/admin/conner/udump/conner_ora_21896.trc---> /opt/oracle/admin/conner/udump/conner_ora_21898.trc14c14< Unix process pid: 21896, image: oracle@jumper.hurray.com.cn (TNS V1-V3)---> Unix process pid: 21898, image: oracle@jumper.hurray.com.cn (TNS V1-V3)16c16< *** SESSION ID9.813) 2006-01-18 22:44:14.314---> *** SESSION ID9.815) 2006-01-18 22:44:21.569
