How to modify the number of connections in Oracle database

Oracle database is one of the more popular databases at present. It has the characteristics of high reliability, high stability and high security, and is widely used in enterprise-level applications. When using Oracle database, we often need to modify its number of connections to meet the needs of the application. This article will introduce how to modify the number of connections in Oracle database.

1. Check the current number of database connections

Before modifying the number of database connections, let’s first check the current number of database connections. We can use the following command to view the number of connections to the current Oracle database:

select count(*) from v$session;

After executing the above command, the number of sessions connected to the current Oracle database will be output. If you need to view detailed connection information, you can use the following command:

select username, machine, program, osuser, sid, serial# from v$session;

After execution, the currently connected session details will be displayed, including login user name, client IP address, connection program, operating system user, Information such as session ID and session serial number.

2. Modify the number of database connections

In the Oracle database, the number of connections is determined by the parameter processes, and its default value is 150. We can modify the number of database connections by modifying the value of the processes parameter. The specific steps are as follows:

1. Use the sysdba user to log in to the Oracle database

In the Linux system, you can use the following command to log in to the Oracle database using the sysdba user:

sqlplus /nolog
conn / as sysdba

2 .Check the value of the current processes parameter

After logging in to the Oracle database, we can use the following command to check the value of the current processes parameter:

show parameter processes;

After executing the above command, the processes of the current database will be output The value of the parameter.

3. Modify the value of the processes parameter

After confirming the value of the current processes parameter, we can use the following command to modify its value:

alter system set processes=<new_value> scope=spfile;

Among them,

4. Restart the Oracle database

After modifying the value of the processes parameter, you need to restart the Oracle database for it to take effect. You can use the following command to restart the Oracle database:

sqlplus /nolog
conn / as sysdba
shutdown immediate
startup

After executing the above command, the Oracle database will be shut down and started, and then the value of the new processes parameter will be applied.

5. Verify the modification results

Finally, we can use the command introduced above again to check the number of connections to the current database and the value of the processes parameter to verify whether the modification takes effect.

3. Summary

This article introduces how to modify the number of connections in the Oracle database. Correctly modifying the number of connections is important to ensure the stability and performance of the application. In practical applications, we need to modify the number of connections according to actual needs, and back up the database before modification to ensure data security.

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