28.4.3 检测Oracle数据库状态

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