How to check oracle database status

Steps to view the status of Oracle database: Connect to the database to view the database instance status (SELECT instance_name, status FROM v$instance;) View the database session status (SELECT sid, serial#, status FROM v$session;) View Database waiting event (SELECT event, wait_time, time_waited, instance_id FROM v$event;) View database parameters (SELECT name, value FROM v$paramet

How to check the status of Oracle database

To check the status of Oracle database, you can use the following steps:

1. Connect to the database

Use the following command to connect to the database through SQL*Plus or other client tools:

<code>sqlplus username/password</code>

2. View the status of the database instance

Use the following command to view the status of the database instance:

<code>SELECT instance_name, status FROM v$instance;</code>

In output:

• ##instance_name: The name of the database instance. status: The status of the database instance, for example:

• OPEN: The database is running. MOUNTED: The database is mounted but not open. NOMOUNT: The database has not been mounted.

  • ##3. View database session status
  • Use the following command to view all sessions connected to the database. Status:

  <code>SELECT sid, serial#, status FROM v$session;</code>

Output:

##sid:

Session ID. :

Session serial number.

##status:

Session status, for example:

• ACTIVE: Session is running. #INACTIVE: The session is idle.
WAITING: The session is waiting for events
• #4. View database waiting events

  Use the following command to view the events that the database is waiting for:

  <code>SELECT event, wait_time, time_waited, instance_id FROM v$event;</code>

  • Output:
  • event:
  The name of the waiting event .

##wait_time:

The time the session waits for the event. ##time_waited:

The total time the session waits for the event.

instance_id: The ID of the database instance.

• 5. View database parameters
Use the following command to view database parameters:

• <code>SELECT name, value FROM v$parameter;</code>

  Output:
name:
• Parameter name.
value:

Parameter value.

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