What is error code :- 12545 in SQL?
What is error 12545 in SQL?
The cause of an ORA-12545 error is a failed connection. This results from a target host or object not existing in the specified parameters of Oracle. It can also result intermittently when trying to connect to a RAC database, via no connection being achieved or the connection being redirected to the wrong host.How to solve ora-12545?
Resolving ORA-12545:
- Verify the TNSNAMES.ORA Entry and validate Host Name. ...
- Test Connectivity to the HOST by. ...
- Use IP instead of HOST Name in ADDRESS (HOST) of TNSNAMES. ...
- If you are able to reach HOST, validate Oracle and Listener exist and are running.
How to restart the Oracle database?
To shut down and restart the database instance, perform the following steps:
- Open a terminal window as the oracle user. ...
- Log in to SQL*Plus as the SYSDBA user. ...
- Issue the SHUTDOWN command to close the database and shut down the instance. ...
- Issue the STARTUP command to start the instance and open the database.
How to refresh Oracle database?
To access the Refresh from Database dialog box, right-click an object in Oracle Metadata Explorer and click Refresh from Database.Resolving SQL Server Connection Errors - SQL in Sixty Seconds #030
How to repair Oracle database?
This is also known as formatting corrupted blocks that are not part of any segment.
- Create a user and grant the user access to the database. ...
- Identify the corrupt block against the data file. ...
- Find the free space. ...
- Reformat first corrupted block. ...
- Verify that the corrupted blocks are fixed.
How to fix ora 12154?
Resolving The Problem
- Verify that a TNSNAMES. ...
- Check to see that the service name is mapped to a connect descriptor in the TNSNAMES. ...
- Confirm there are no syntax errors anywhere in the file. ...
- Check with Oracle/SQL*NET Administrator, and confirm a successful connection can be made through SQL*Plus.
What is error code Ora 12454?
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.)How to activate Oracle database?
To start up a database instance, you use the STARTUP command:
- STARTUP.
- STARTUP;
- STARTUP OPEN;
- STARTUP stage;
- STARTUP NOMOUNT;
- ALTER DATABASE MOUNT;
- shutdown immediate;
- Database closed. Database dismounted. ORACLE instance shut down.
What is SQL error code :- 12154?
The “ORA-12154: TNS:could not resolve the connect identifier specified” Oracle error is a commonly seen message for database administrators. When this occurs, there's an issue with creating a connection with one of your Oracle services or database instances.How do I resolve SQL errors?
Debugging a SQL query
- Go to the line that is failing in your SQL query. ...
- Check the SQL syntax on the line that is failing in your SQL query.
- Check your query logic if the query uses joins, subqueries, or CTEs.
- If you get an error message that isn't specific to your SQL query, go to Troubleshooting error messages.
How do I get rid of SQL error?
1 Answer
- In Object Explorer, expand the instance of SQL Server, expand Management, right-click SQL Server Logs, and then click Configure.
- In the Configure SQL Server Error Logs dialog box, choose from the following options. a. Log files count. Limit the number of the error log files before they are recycled.
How to connect Oracle Database to SQL?
To connect to OracleOn the File menu, select Connect to Oracle. If you previously connected to Oracle, the command name will be Reconnect to Oracle. In the Provider box, select Oracle Client Provider or OLE DB Provider, depending on which provider is installed. The default is Oracle client.
How to connect to Oracle Database using SQL?
Accessing Oracle Database with Oracle SQL Developer
- Right-click Connections.
- Select New Connection.
- In the New/Select Database Connection dialog box, enter a Connection name, username, password, and for the host string, the name of the database to which you want to connect.
- Click Connect.
What is Ora 12543 TNS destination host unreachable?
The error "ORA-12543: TNS: destination host unreachable" is most commonly found when there is there is a problem with network connectivity; however, there are a few other reasons for encountering the error. Cause: Contact can not be made with remote party.What is vendor code 12504?
ORA-12504 TNS-12504 – TNS:listener was not given the SERVICE_NAME in CONNECT_DATA. This error occurs when there was no default service configured for the listener and SERVICE_NAME was missing from the request received by the listener.What is Oracle vendor code 12504?
The error 12504 is an Oracle error code, specifying that the Oracle listener was not configured with a default service and SERVICE_NAME was missing from the CONNECT_DATA received by the listener.What is error ora 12543?
ORA-12543: TNS:destination host unreachable Cause: Contact can not be made with remote party. Action: Make sure the network driver is functioning and the network is up. If the Network driver is broken and network is down, you can get this error. So you need to make sure network is up and enabled.How to resolve ora 12547?
To resolve the "ORA-12547: TNS:lost contact" error:
- Shutdown the Oracle instance.
- Remove the erroneous forward slash from the environment variable, shell profiles, scripts used to start the database, the listener inside SRVCTL, /etc/oratab, et cetera.
- Restart the Oracle instance.
Where is TNS Ora file located?
By default, the tnsnames. ora file is located in the ORACLE_HOME/network/admin directory.How to ping an Oracle database?
You can use tnsping in your command line and ping the connect identifier, which will direct the ping to the database server. Use the host command to call the tnsping(note that for using tnsping, db must be installed in the machine where you are calling the form).How do I repair a SQL database?
How To Repair a Corrupted SQL Database
- Step 1 – Attempt Repair with SQL Server Management Studio (Optional) ...
- Step 2 – Choose a Good Database Repair Tool (Recommended) ...
- Step 3 – Download Your SQL Repair Tool. ...
- Step 4 – Run Your SQL Database Repair Tool. ...
- Step 5 – Scan the Corrupted SQL Database.
How do I know if my Oracle database is corrupted?
- To check a database for physical and logical corruption, run the following command within Oracle RMAN:
- DBVerify is an external command-line utility for validating online and offline databases and files, including backups.
How to restore Oracle database in SQL Server?
Recommended Migration Process
- Create a new SSMA project. ...
- Connect to the Oracle database server.
- Connect to an instance of SQL Server.
- Map Oracle database schemas to SQL Server database schemas.
- Optionally, Create assessment reports to assess database objects for conversion and estimate the conversion time.
How to check database connections in Oracle?
To verify connectivity for a client computer, use Oracle Net Manager:
- Start Oracle Net Manager. See Also: ...
- In the navigator, expand Directory or Local > Service Naming.
- Select the net service name or database service.
- Choose Command > Test Net Service. ...
- Click Close to dismiss the Connect Test dialog box.
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