Check whether oracle is started

Oracle is a common relational database management system that is usually widely used in enterprise-level applications. When using Oracle for database development and maintenance, the most important step is to ensure that Oracle has been started correctly.

In this article, we will introduce how to check whether Oracle has started.

1. Check whether the Oracle service has been started

In the Windows operating system, you can press the "Win R" key to open the run window and enter "services.msc" Open the service manager, and then find the Oracle service in the service manager to confirm whether the Oracle service has been started.

If the Oracle service has been started, it means that Oracle is running normally. If the Oracle service does not start, you need to start the Oracle service manually.

2. Running Oracle Instance

An Oracle database instance includes many processes that work together to manage the database. After confirming that the Oracle service has been started, you need to check whether the Oracle instance is running.

You can log in to the database server, open a command line window, and then run the Oracle instance as an administrator. It should be noted that the name of the Oracle instance can vary according to the actual situation.

If the Oracle instance is running, information similar to "Instance started: XXXX" (where XXXX represents the name of the Oracle instance) will be displayed.

If the Oracle instance is not running, you can use the following command to start the Oracle instance:

$ sqlplus /nolog
SQL> conn / as sysdba
SQL> startup

The above command first opens the SQL*Plus command line tool, then connects to the Oracle instance as the SYSDBA user, and Start the Oracle instance.

3. Check whether the listener is working properly

The Oracle listener is the process that communicates with the Oracle database. If the Oracle listener is not working properly, the client cannot connect to the Oracle database.

You can use the following command to check whether the Oracle listener is working properly:

$ lsnrctl status

If the listener is running, "Listener is running" will be displayed. If the listener is not running, you can use the following command to start the listener:

$ lsnrctl start

The above command will start the listener and allow the client to connect to the Oracle database.

4. Check whether the Oracle connection is normal

The last step is to check whether you can connect to the Oracle database. You can use the following command to log in to the Oracle database:

$ sqlplus username/password@database

where username is the username to log in to the Oracle database, password is the password corresponding to the username, and database is the name of the database to be connected.

If you can successfully log in to the Oracle database, it means that Oracle has been started normally and is running.

Summary:

When using Oracle for database development and maintenance, you first need to ensure that Oracle has been started correctly. You can confirm whether Oracle has started by checking whether the Oracle service has been started, running the Oracle instance, checking whether the listener is working normally, and checking whether the Oracle connection is normal.

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