TNS-12518: TNS:listener could not hand off client connection

Hi,

Sometimes You can get “TNS-12518: TNS:listener could not hand off client connection  ” error.

Details of error are as follows.

TNS-12518: TNS:listener could not hand off client connection

This error is related with out of available Oracle processes.

To solve this error, you should increase the PROCESSES parameter as follows.

SQL> show parameter processes

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
aq_tm_processes integer 1
db_writer_processes integer 1
gcs_server_processes integer 0
global_txn_processes integer 1
job_queue_processes integer 1000
log_archive_max_processes integer 4
processes integer 1500
SQL>
SQL>
SQL> alter system set processes=2000 scope=spfile;

System altered.

SQL>

Restart database after this operation.

Or you should check ‘max user processes’ etc. with ‘ulimit -a‘ command, and if it is insufficient, then increase it.

For windows environment.

set logging_listener_name=on in the listener.ora and reload the listener.

Or restart all Oracle services, it will be fine.

Do you want to learn more details about RMAN, then read the following articles.

https://ittutorial.org/rman-backup-restore-and-recovery-tutorials-for-beginners-in-the-oracle-database/

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