28.4.3 检测Oracle数据库状态
Oracle启动后，为检测Oracle服务的运行是否正常，可以执行ps命令检查相关的Oracle服务进程，也可以通过Oracle所提供的命令进行检查。具体介绍如下所示。
（1）执行ps命令查看数据库进程情况。
- ps -ef | grep oracle
（2）在sqlplus中执行命令查看数据库状态。
- $ export ORACLE_SID=orcl //设置ORACLE_SID环境变量
- $ sqlplus /nolog //执行sqlplus命令
- SQL*Plus: Release 11.1.0.6.0 - Production on Wed Oct 29 16:27:36 2008
- Copyright (c) 1982, 2007, Oracle. All rights reserved.
- SQL> conn sys@orcl as sysdba //连接数据库
- Enter password:
- Connected.
- SQL> select open_mode from v$database; //执行SQL查看数据库的打开方式
- OPEN_MODE
- ----------
- READ WRITE //"READ WRITE"表示数据库状态正常
如果连接数据库时看到如下提示，那么表示数据库并未启动。
- SQL> conn sys as sysdba
- Enter password:
- Connected to an idle instance. //数据库未启动
（3）执行lsnrctl status命令查看网络监听程序的状态，正常情况下应该能够看到如下提示信息。
- $ lsnrctl status //查看oracle监听程序的状态
- LSNRCTL for Linux: Version 11.1.0.6.0 - Production on 29-OCT-2008 16:35:11
- Copyright (c) 1991, 2007, Oracle. All rights reserved.
- Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=demoserver)(PORT=
- 1521)))
- STATUS of the LISTENER
- ------------------------
- Alias LISTENER //名称
- Version TNSLSNR for Linux: Version 11.1.0.6.0 - Production
//版本号 - Start Date 29-OCT-2008 15:40:30 //启动时间
- Uptime 0 days 0 hr. 54 min. 41 sec //已经运行的时间
- Trace Level off
- Security ON: Local OS Authentication
- SNMP OFF
- //监听程序的参数文件
- Listener Parameter File /u01/app/oracle/product/11.1.0/db_1/network/ad-
- min/listener.ora
- Listener Log File /u01/app/oracle/product/11.1.0/db_1/log/diag/tn-
- slsnr/demoserver/listener/alert/log.xml //监听程序的日志文件
- Listening Endpoints Summary...
- (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost.
localdomain)(PORT=1521))) - (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
- Services Summary...
- Service "orcl" has 1 instance(s). //orcl服务
- Instance "orcl", status READY, has 1 handler(s) for this service...
- Service "orcl_XPT" has 1 instance(s). //orcl_XPT服务
- Instance "orcl", status READY, has 1 handler(s) for this service...
- The command completed successfully
如果监听程序没有启动，那么将返回如下错误信息。
- $ lsnrctl status //查看oracle监听程序的状态
- LSNRCTL for Linux: Version 11.1.0.6.0 - Production on 29-OCT-2008 16:36:28
- Copyright (c) 1991, 2007, Oracle. All rights reserved.
- Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=demoserver)(PORT=
- 1521)))
- TNS-12541: TNS:no listener //没有发现监听程序
- TNS-12560: TNS:protocol adapter error
- TNS-00511: No listener
- Linux Error: 111: Connection refused
- Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
- TNS-12541: TNS:no listener //没有发现监听程序
- TNS-12560: TNS:protocol adapter error
- TNS-00511: No listener
- Linux Error: 2: No such file or directory