How to Check Active Connection In Oracle?

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To check active connections in Oracle, you can query the V$SESSION view in the Oracle database. This view provides information about the active sessions in the database, including details such as the username, program name, and status of each session. By querying this view, you can see which users are currently connected to the database and what they are doing. Additionally, you can also use the V$SESSION view to monitor the overall health and performance of the database by looking at the number of active connections and the resources they are consuming.

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How can I see the active connections in Oracle SQL Developer?

In Oracle SQL Developer, you can view active database connections by following these steps:

  1. Open Oracle SQL Developer and connect to the database you want to monitor.
  2. In the main menu, go to "View" and select "DBA" from the dropdown menu.
  3. In the DBA panel that appears on the left side of the screen, expand the "Connections" node under your database connection.
  4. This will display a list of all active connections to the database, including information such as username, client IP address, and connection status.


Alternatively, you can run the following SQL query to view active connections:

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SELECT * FROM V$SESSION;


This query will display detailed information about all active sessions in the database, including username, program, machine, and status.


How to monitor active connections in Oracle Enterprise Manager?

To monitor active connections in Oracle Enterprise Manager, you can follow these steps:

  1. Log in to Oracle Enterprise Manager using your credentials.
  2. Navigate to the Performance menu and select Active Sessions from the drop-down list.
  3. This will display a list of active sessions in the database. You can see details such as user name, program, SQL statement, and other relevant information about each active session.
  4. You can also view the Active Sessions chart to visualize the active connections over a specified time period.
  5. You can further drill down into specific active sessions by clicking on them to see more detailed information.
  6. You can set up alerts and notifications to be notified when certain thresholds are reached for active connections.


By monitoring active connections in Oracle Enterprise Manager, you can keep track of the overall performance of your database and identify any potential issues or bottlenecks that may be affecting its performance. This can help you optimize the database and ensure smooth operation for your users.


How to identify active sessions in Oracle Database?

To identify active sessions in an Oracle Database, you can use the following methods:

  1. Query the V$SESSION view: You can query the V$SESSION view in Oracle to get information about all active sessions in the database. You can use the following SQL query to retrieve active sessions:
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SELECT sid, serial#, username, status, osuser, machine, program
FROM v$session
WHERE status = 'ACTIVE';


This query will return the session ID, serial number, username, status, operating system user, machine name, and program for all active sessions in the database.

  1. Check the Enterprise Manager: If you are using Oracle Enterprise Manager, you can go to the Performance section and look for the Active Sessions page. This page will display information about all active sessions in the database including details such as session ID, username, machine name, and program.
  2. Use the Oracle Active Session History (ASH) report: You can generate an ASH report to get a detailed analysis of active sessions in the database. The ASH report can provide information about active sessions, their wait events, and other related statistics.


By using these methods, you can easily identify active sessions in an Oracle Database.


What is the SQL query to display active connections in Oracle?

To display active connections in Oracle, you can use the following SQL query:

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SELECT SID, SERIAL#, USERNAME, OSUSER, PROGRAM, MACHINE, LOGON_TIME
FROM V$SESSION
WHERE STATUS = 'ACTIVE';


This query retrieves the SID, SERIAL#, USERNAME, OSUSER, PROGRAM, MACHINE, and LOGON_TIME for all active connections in the database from the V$SESSION view.


What is the recommended approach to optimizing active connections in Oracle?

There are several recommended approaches to optimizing active connections in Oracle:

  1. Use connection pooling: Connection pooling allows multiple clients to share a set of reusable connections to the database, reducing the overhead of creating and closing connections for each client. This helps improve performance by reducing the number of active connections and enhancing the overall efficiency of database operations.
  2. Tune the database connection settings: Adjusting parameters such as the maximum number of connections allowed, idle connection timeout, and maximum sessions per user can help optimize active connections in Oracle. These settings should be carefully configured to balance performance and resource usage.
  3. Monitor and manage connection usage: Regularly monitor the number of active connections to the database and identify any potential bottlenecks or issues. Implementing tools for connection tracking and management can help identify and address any issues related to connection usage.
  4. Implement connection caching: Caching database connections can help reduce the overhead of establishing new connections and improve overall performance. By caching connections at the application level, unnecessary connections can be avoided, leading to better resource utilization and performance.
  5. Optimize SQL queries and database design: Improving the efficiency of SQL queries and ensuring that the database schema is well-designed can help reduce the need for excessive connections and improve overall database performance. By optimizing queries and database design, the number of concurrent connections required can be minimized, leading to better performance and resource utilization.


Overall, optimizing active connections in Oracle involves a combination of connection pooling, tuning database settings, monitoring connection usage, implementing connection caching, and optimizing SQL queries and database design. By following these recommended approaches, organizations can achieve better performance and efficiency in their Oracle databases.

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