What is ORA-12528 error?

The ORA-12528 is a new error which has begun with Oracle 10g. Typically (in Oracle 9i and above), when you “shutdown” an Oracle database, that process “unregisters” the database with the LISTENER. Then when you “startup” the database, it “registers” with the LISTENER.

How do I fix ORA-12528 TNS listener all appropriate instances are blocking new connections?

ORA-12528: TNS:listener: all appropriate instances are blocking new connections. To solve this problem you need to make static registration of your service in listener. ora. You need to restart listener to make it effective.

How do I fix Ora 01507 database not mounted?

This ORA-01507 error is related with the Bug 17308532 : ORA-1507 DETECTED WHEN STOP DB BY SRVCTL. Check and try to make database in mount mode as follows. SQL> alter database mount; Read the following post if your controlfile doesn’t exist.

What does Cannot find available handler for requested type of server?

This error is related with out of available Oracle processes. If processes parameters are insufficient, then you should increase the PROCESSES parameter as follows. Restart database after this operation.

What does Oracle listener do?

Oracle Net Listener is a separate process that runs on the database server computer. It receives incoming client connection requests and manages the traffic of these requests to the database server. This chapter describes how to configure the listener to accept client connections.

What is alter database open?

Opening a Closed Database To open a mounted database, use the ALTER DATABASE statement with the OPEN clause: ALTER DATABASE OPEN; After executing this statement, any valid Oracle Database user with the CREATE SESSION system privilege can connect to the database.

How do you mount a database?

To mount the database, the instance finds the database control files and opens them. Control files are specified in the CONTROL_FILES initialization parameter in the parameter file used to start the instance. Oracle then reads the control files to get the names of the database’s datafiles and redo log files.

How do I fix my ORA 12520?

The immediate solution was to stop/restart Aleph and Oracle. This # processes needs to be increased to 400 or 800: 200 for (recommended value for a ‘small’ system), 400 for (recommended value for a ‘medium’ system).

How does SQL Listener work?

A listener allows a client to connect to a replica without having to know the physical instance name of the SQL Server. If read-only routing is configured for one or more readable secondary replicas, read-intent client connections to the listener are automatically redirected to a readable secondary replica.

What is listener process?

Use Listener processes to monitor incoming requests to an endpoint. In a listener process, the Start shape either has a connector with the Listen action or is configured with the Trading Partner option. When a listener process is deployed, the Start shape monitors incoming requests to the endpoint.

What does ora-12528 : TNS : listener mean?

Sometimes You can get “ ORA-12528: TNS:listener: all appropriate instances are blocking new connections ” error. Details of error are as follows. the new connections. This condition may be temporary, such as at instance startup. Action: Attempt the connection again.

What to do if you get an ora-12528 error?

If error persists, then contact the administrator to check the status of the instances. The ORA-12528 is a new error which has begun with Oracle 10g. Restarting the Oracle instance can solve transient ORA-12528 errors.

How to add listener description to Ora file?

Add the following listener descriptions to the listener.ora file under $ORACLE_HOME/network/admin. Check your Hostname, Port, DB Name and fill them correctly. Or Restart database and listener. Do you want to learn more details about RMAN, then read the following articles.