linux close oracle

How to close Oracle database in Linux

Oracle database is one of the most popular and widely used relational databases in the industry. Installing and running an Oracle database on a Linux system is a complex process, especially when shutting down the database. You also need to pay attention to some details. In this article, we will introduce how to shut down the Oracle database gracefully to avoid data loss and hardware damage.

First of all, before shutting down the Oracle database, it is recommended that administrators back up the data. Although the Oracle database will automatically write data to disk, if the system crashes or a hardware failure occurs, data loss may still occur, so backup is the best choice. Backup can be completed through the backup tool that comes with the Oracle database or the tar command that comes with the Linux system.

After preparing the backup, you can start closing the database. In Linux systems, closing the Oracle database can be done through the sqlplus command line interface or using the graphical management tools provided by Oracle. Next, the specific steps of these two methods are introduced respectively.

1. Close the database through the sqlplus command line interface

Step 1: Log in to the system

First you need to log in to the system as the Oracle database administrator user:

$ su - oracle

Step 2: Start sqlplus

Enter the sqlplus command line:

$ sqlplus / as sysdba

Step 3: Close the database instance

In the sqlplus command line, enter the following Command to shut down the database instance:

SQL> shutdown immediate;

This command will immediately shut down the running database instance. If there is an executing session, the session will be interrupted and all uncommitted transactions rolled back.

Step 4: Exit sqlplus

After closing the database instance, you can exit the sqlplus command line interface:

SQL> exit;

2. Close the database through the graphical management tool

Oracle database provides some graphical management tools, such as Enterprise Manager (EM) and Database Control (DBControl), which can help administrators manage and monitor the database more conveniently. Below are the steps to close the database through EM and DBControl.

Step 1: Log in to EM or DBControl

You need to log in to EM or DBControl management tool as the Oracle administrator user.

Step 2: Select "Close Instance"

Select the "Close Instance" option on the EM or DBControl interface. This will pop up a confirmation window asking the administrator if they are sure to shut down the database instance.

Step 3: Confirm and close the instance

In the pop-up confirmation window, confirm that the administrator wants to close the instance, and click the "Close" button to complete the shutdown process.

Step 4: Exit EM or DBControl

After closing the instance, you can exit the EM or DBControl management tool.

Summary

Oracle database is one of the key parts of enterprise-level applications. Shutting down a database is a task that every administrator must face. When shutting down an Oracle database, make sure to back up the data beforehand and use appropriate methods to shut down the database. In this article, two methods of shutting down the Oracle database are introduced. Administrators can choose the method that suits them to shut down the database according to their own needs.

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