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Youreceivedtheseerrormessagesbecausetheclientcannotfindthedesireddatabase：ORA-12198：TNS：couldnotpathtodestinationORA-12203：TNS：unabletoconnecttodestinationWhichactionwouldbeappropriateinhelpingtoresolvetheerrors？（）
A.A
B.B
C.C
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合成气中,氢碳比的计算公式是()。
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YouworkasadatabaseadministratorforSupportcenter.cn.Whenyoutriedtoconnecttothedatabase，youreceivedthefollowingerror：ERROR：ORA-12541：TNS：no_listenerYoufoundthatthelistenerisnotrunningontheserver，soyouissuedthefollowingcommandintheListenerControlutilitytostartthelistener.lsnrctlSTARTWhatstatementistrue？（）A.ItwouldattempttostartthedefaultlistenerB.It wouldstartthemostrecentlycreatedlistener.C.Itwoulddisplayanerrorwithamessageaskingforthelistenernametobespecified.D.Itwouldshowyoualistoflistenersandpromptsforthelistenernamethatyouwanttostart.
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YouworkasadatabaseadministratorforSupportcenter.cn.YoudecidedtomanageclientandserverconnectionsusingLocalNamingmethodinSupportcenter.cn.Whenyoutrytoconnecttothedatabaseyougetthefollowingerror：ERROR：ORA-12154：TNS：couldnotresolveservicenameWhichnetworkconfigurationfileswouldyoulookintotoresolvethiserror？（）A.snmp.oraB.names.oraC.spfile.oraD.sqlnet.oraE.listener.oraF.tnsnames.ora
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Youmanuallycreateanadditionallistenerprocess,L1,forstartl1Starting/u01/app/oracle/product/10.1.0/db_1/bin/tnslsnr：pleasewait...TNSLSNRforLinux：Version10.1.0.2.0-ProductionSystemparameterfileis/u01/app/oracle/product/10.1.0/db_1/network/admin/listener.oraLogmessageswrittento/u01/app/oracle/product/10.1.0/db_1/network/log/l1.logErrorlisteningon：（ADDRESS=（PROTOCOL=TCP）（HOST=144.23.230.185）（port=8899））TNS-12542：TNS：addressalreadyinuseTNS-12560：TNS：protocoladaptererrorTNS-00512：AddressalreadyinuseLinuxError：98：AddressalreadyinuseListenerfailedtostart.Seetheerrormessage（s）above...Whatactionwouldyoutaketoovercomethiserrorwithoutdisruptinganyexistingdatabasecommunications？（）
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Whichofthefollowingenvironmentvariablesspecifiesanon－defaultlocationforthelistenerconfigurationfile?()
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在登录CTAIS生产机系统，输入用户名和密码后，系统提示“sqlca连接失败：ORA—12535：TNS：operation timed out请确认用户名或口令是否正确！”的错误提示，可能是什么原因？
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You manually create an additional listener process，L1，for databases PROD， PAYDB and FINDB. While starting up the listener process，you get the following error message： LSNRCTL start l1 Starting /u01/app/oracle/product/10.1.0/db_1/bin/tnslsnr： please wait... TNSLSNR for Linux： Version 10.1.0.2.0 - Production System parameter file is /u01/app/oracle/product/10.1.0/db_1/network/admin/listener.ora Log messages written to /u01/app/oracle/product/10.1.0/db_1/network/log/l1.log Error listening on： （ADDRESS=（PROTOCOL=TCP）（HOST=144.23.230.185）（port=8899）） TNS-12542： TNS：address already in use TNS-12560： TNS：protocol adapter error TNS-00512： Address already in use Linux Error： 98： Address already in use Listener failed to start. See the error message（s） above... What action would you take to overcome this error without disrupting any existing database communications？（）A、stop and restart the listener processB、set the TNS_ADMIN environmental variableC、stop all running listener processes and restart the listener processD、change the port number to an unused port number and restart the listener processE、change the IP address to host machine name in the LISTENER.ORA file and restart the listener process
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Which of the following environment variables specifies a non-default location for the listener configuration file？（）A、LSN_ADMINB、TNS_ADMINC、ADMIN_TNSD、TSN_ADMIN
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The tnsnames.ora file has an entry for the service alias ORCL as follows:The TNS ping command executes successfully when tested with ORCL; however, from the same OS usersession, you are not able to connect to the database instance with the following command:SQL CONNECT scott/tiger@orcl What could be the reason for this?（）A、The listener is not running on the database node.B、The TNS_ADMIN environment variable is set to the wrong value.C、The orcl.oracle.com database service is not registered with the listener.D、The DEFAULT_DOMAIN parameter is set to the wrong value in the sqlnet.ora file.E、The listener is running on a different port.
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单选题What could be the reason for this（）A
The listener is not running on the database node.B
The TNS_ADMIN environmental variable is set to a wrong value.C
The orcl.oracle.com database service is not registered with the listener.D
The DEFAULT_DOMAIN parameter is set to a wrong value in the sqlnet.ora file.
考题
单选题The tnsnames.ora file has an entry for the service alias ORCL as follows:The TNS ping command executes successfully when tested with ORCL; however, from the same OS usersession, you are not able to connect to the database instance with the following command:SQL CONNECT scott/tiger@orcl What could be the reason for this?（）A
The listener is not running on the database node.B
The TNS_ADMIN environment variable is set to the wrong value.C
The orcl.oracle.com database service is not registered with the listener.D
The DEFAULT_DOMAIN parameter is set to the wrong value in the sqlnet.ora file.E
The listener is running on a different port.
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问答题在登录CTAIS生产机系统，输入用户名和密码后，系统提示“sqlca连接失败：ORA—12535：TNS：operation timed out请确认用户名或口令是否正确！”的错误提示，可能是什么原因？
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