Oracle啟動后，為檢測Oracle服務(wù)的運行是否正常，可以執(zhí)行ps命令檢查相關(guān)的Oracle服務(wù)進(jìn)程，也可以通過Oracle所提供的命令進(jìn)行檢查。具體介紹如下所示。
（1）執(zhí)行ps命令查看數(shù)據(jù)庫進(jìn)程情況。
ps -ef | grep oracle
（2）在sqlplus中執(zhí)行命令查看數(shù)據(jù)庫狀態(tài)。
$ export ORACLE_SID=orcl //設(shè)置ORACLE_SID環(huán)境變量
$ sqlplus /nolog //執(zhí)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 //連接數(shù)據(jù)庫
Enter password:
Connected.
SQL> select open_mode from v$database; //執(zhí)行SQL查看數(shù)據(jù)庫的打開方式
OPEN_MODE
----------
READ WRITE //“READ WRITE”表示數(shù)據(jù)庫狀態(tài)正常
如果連接數(shù)據(jù)庫時看到如下提示，那么表示數(shù)據(jù)庫并未啟動。
SQL> conn sys as sysdba
Enter password:
Connected to an idle instance. //數(shù)據(jù)庫未啟動
（3）執(zhí)行lsnrctl status命令查看網(wǎng)絡(luò)監(jiān)聽程序的狀態(tài)，正常情況下應(yīng)該能夠看到如下提示信息。
$ lsnrctl status //查看oracle監(jiān)聽程序的狀態(tài)
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 //名稱
Version TNSLSNR for Linux: Version 11.1.0.6.0 – Production //版本號
Start Date 29-OCT-2008 15:40:30 //啟動時間
Uptime 0 days 0 hr. 54 min. 41 sec //已經(jīng)運行的時間
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
//監(jiān)聽程序的參數(shù)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 //監(jiān)聽程序的日志文件
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服務(wù)
Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orcl_XPT" has 1 instance(s). //orcl_XPT服務(wù)
Instance "orcl", status READY, has 1 handler(s) for this service...
The command completed successfully
如果監(jiān)聽程序沒有啟動，那么將返回如下錯誤信息。
$ lsnrctl status //查看oracle監(jiān)聽程序的狀態(tài)
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 //沒有發(fā)現(xiàn)監(jiān)聽程序
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 //沒有發(fā)現(xiàn)監(jiān)聽程序
TNS-12560: TNS:protocol adapter error
TNS-00511: No listener
Linux Error: 2: No such file or directory
