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ORA-12454: connect failed because target host or object does not exist tips

Oracle Error Tips by Stephanie F

The Oracle docs note this on the ora-12454 error:

ORA-12545: Connect failed because target host or object does not exist
Cause: The address specified is not valid, or the program being connected to does not exist.
 

Action: Ensure the ADDRESS parameters have been entered correctly; the most likely incorrect parameter is the node name. Ensure that the executable for the server exists (perhaps "oracle" is missing.) If the protocol is TCP/IP, edit the TNSNAMES.ORA file to change the host name to a numeric IP address and try again.

On Oracle DBA Forums, a user posts about having problems connecting on local workstation options to a new database. Below are the specifics of the question, as well as the original conflicts with ORA-12545:

Question

I have Oracle 9i installed on my local Windows XP workstation that will be used for local development only.  Now I am trying to create a database and using OEM Database Configuration Assistant.
I put in FirstDB for the Global Database Name and put in FirstDB for the SID.

I completed the wizard and set up my tnsnames.ora file with the SID and hostname. Then I tried to connect using OEM with the Sys login and it says:
ORA-12545:Connect failed because target host or object does not exist.

Should I put in localhost or 127.0.0.1 for my Global Database Name?

I assume I connect as Sys or System and the password I created right after creating the database.

Please advise on how I can get this to work?

Answer:  The replier advised two actions to begin resolving ORA-12545, starting by:

  • making sure that your listener is running (lsnrcrl stat)
  • testing connectivity with ping, and then tnsping.
  • verifying connectivity via the DNS (e.g. /etc/hosts)
  • make sure to check your tnsnames.ora parms.

Also important in resolving ORA-12545 if using VIP's is to "start by verifying connectivity via the DNS (e.g. /etc/hosts), and make sure to check your tnsnames.ora parms."


Here is a helpful link to offer more information on troubleshooting connectivity errors.



 

 

  
 

 
 
 
 
 

 
 
 
 
 
 
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