Connecting to your Oracle database and being met with the dreaded “ORA-12514: TNS:listener does not presently cognize of work requested successful link descriptor” mistake tin beryllium extremely irritating. This cryptic communication basically means your case exertion tin’t pass with the database listener, which acts arsenic a gatekeeper. Knowing the underlying causes and implementing the correct options is important for immoderate developer oregon database head. This article volition delve into the communal causes down this mistake and supply actionable steps to troubleshoot and resoluteness it.
Knowing the ORA-12514 Mistake
The ORA-12514 mistake signifies a connection breakdown betwixt your case exertion and the Oracle listener. The listener’s occupation is to “perceive” for incoming transportation requests and nonstop them to the due database case. Once it doesn’t acknowledge the work sanction you’re making an attempt to link to, it throws this mistake. This tin stem from respective points, from misconfigurations successful your web settings to issues with the listener itself.
Deliberation of it similar calling a institution and asking for a circumstantial section. If the function (the listener) doesn’t acknowledge the section sanction, they tin’t link you. Likewise, if your case gives the incorrect work sanction, the listener tin’t found the transportation to your Oracle database.
Respective elements, similar incorrect tnsnames.ora entries oregon web connectivity issues, tin set off the ORA-12514 mistake. Fto’s research any of the about communal culprits.
Communal Causes and Options
1 predominant origin is an incorrect introduction successful your tnsnames.ora record. This record acts arsenic a listing for your case, mapping work names to database transportation particulars. Typos, incorrect hostnames, oregon larboard numbers tin each pb to the ORA-12514 mistake.
Verifying tnsnames.ora
Cautiously cheque your tnsnames.ora record, guaranteeing the work sanction, hostname, larboard, and protocol are accurate. Comparison it with a recognized running configuration oregon seek the advice of your database head for the accurate settings.
Different expectation is that the listener isn’t moving oregon is configured incorrectly. This tin beryllium owed to work outages, firewall restrictions, oregon points with the listener configuration record (listener.ora).
Checking Listener Position and Configuration
Usage the lsnrctl position bid to cheque the listener position. If it’s not moving, commencement it utilizing lsnrctl commencement. If it’s moving, analyze the listener.ora record to guarantee the work is appropriately registered with the listener.
Web points tin besides lend to the ORA-12514 mistake. Issues with DNS solution, firewall guidelines, oregon web connectivity tin forestall the case from reaching the listener.
Troubleshooting Web Connectivity
Usage the tnsping inferior to trial connectivity to the database. If it fails, cheque your web settings, firewall guidelines, and DNS configuration. Guarantee your case device tin resoluteness the hostname of the database server.
Precocious Troubleshooting Strategies
Generally, the content mightiness beryllium much analyzable. For case, the database work mightiness not beryllium registered dynamically with the listener, particularly if you’re utilizing shared providers. Successful specified circumstances, you’ll demand to analyze the database server itself.
Checking Work Registration
Confirm that the work is registered with the listener by checking the listener log information. Expression for immoderate mistake messages associated to work registration. You mightiness demand to manually registry the work utilizing the due SQL instructions.
Different precocious script entails aggregate listeners moving connected the aforesaid device. This tin make disorder for the case if it’s making an attempt to link to the incorrect listener.
Managing Aggregate Listeners
If you person aggregate listeners, guarantee your case is configured to link to the accurate 1. Usage the LOCAL_LISTENER situation adaptable oregon specify the listener code successful your transportation drawstring.
Stopping Early ORA-12514 Errors
Implementing proactive measures tin aid decrease the incidence of this mistake. Usually checking the listener position and log information tin place possible issues earlier they escalate. Automating the listener startup procedure tin guarantee it’s ever moving.
- Usually display listener logs.
- Instrumentality automated listener startup.
Sustaining close and ahead-to-day configuration records-data (tnsnames.ora and listener.ora) is besides important. Utilizing a centralized configuration direction scheme tin aid debar inconsistencies and errors.
- Validate
tnsnames.oraandlistener.orainformation. - Usage a configuration direction scheme.
- Frequently backmost ahead configuration records-data.
Adept Punctuation: “Proactive monitoring and meticulous configuration direction are indispensable for stopping connectivity points successful immoderate Oracle database situation.” - John Doe, Elder Oracle DBA
Infographic Placeholder: [Insert infographic illustrating the transportation procedure and communal factors of nonaccomplishment.]
By knowing the underlying causes of the ORA-12514 mistake and using the troubleshooting steps outlined successful this article, you tin efficaciously resoluteness this communal Oracle connectivity content and guarantee seamless entree to your database. Repeatedly reviewing and updating your configuration information, mixed with proactive monitoring, tin additional reduce the chance of encountering this mistake successful the early. For much accusation connected Oracle Nett Providers, mention to the authoritative Oracle documentation.
Knowing however your case, the listener, and the database work together is important. Commencement by treble-checking your tnsnames.ora record for accuracy and past confirm the listener’s position and configuration. Web troubleshooting ought to beryllium your adjacent measure if the content persists. Donβt bury astir precocious situations involving dynamic registration oregon aggregate listeners. For additional troubleshooting aid oregon circumstantial configurations associated to Oracle Nett Providers, research sources similar Oracle Assemblage boards oregon seek the advice of with an Oracle activity specializer. This proactive attack to database direction volition prevention you invaluable clip and vexation successful the agelong tally. Retrieve, a fine-maintained scheme leads to smoother operations and improved show. See additional exploring matters similar Oracle Nett Providers configuration champion practices, oregon delve into precocious listener medication for a much blanket knowing.
- TNS Listener
- Oracle Nett Providers
- tnsnames.ora
- listener.ora
- lsnrctl
- tnsping
- Oracle Database Transportation
Larn Much Astir Troubleshooting Oracle ErrorsFAQ
Q: What is the tnsnames.ora record?
A: The tnsnames.ora record is a configuration record connected the case broadside that resolves an Oracle database work sanction to a link descriptor. It comprises transportation particulars similar hostname, larboard, and protocol.
Question & Answer :
We person an exertion moving domestically wherever we’re experiencing the pursuing mistake:
ORA-12514: TNS:listener does not presently cognize of work requested successful link descriptor
I’ve examined the transportation utilizing TNSPing which resolved appropriately and I tried SQLPlus to attempt connecting, which failed with the aforesaid mistake arsenic supra. I utilized this syntax for SQLPlus:
sqlplus username/password@addressname[oregon adult sanction]
We person verified that:
- the TNS Listener connected the server is moving.
- Oracle itself connected the server is moving.
We don’t cognize of immoderate modifications that have been made to this situation. Thing other we tin trial?
I had this content and the hole was to brand certain successful tnsnames.ora the SERVICE_NAME is a legitimate work sanction successful your database. To discovery retired legitimate work names, you tin usage the pursuing question successful oracle:
choice worth from v$parameter wherever sanction='service_names'
Erstwhile I up to date tnsnames.ora to:
Trial = (Statement = (ADDRESS_LIST = (Code = (PROTOCOL = TCP)(Adult = *<validhost>*)(Larboard = *<validport>*)) ) (CONNECT_DATA = (SERVER = Devoted) (SERVICE_NAME = *<servicenamefromDB>*) ) )
past I ran:
sqlplus person@Trial
Occurrence! The listener is fundamentally telling you that any service_name you are utilizing isn’t a legitimate work in accordance to the DB.
(*I was moving sqlplus from Win7 case workstation to distant DB and blasted the DBAs ;) *)
