How to check how many users there are in oracle

Oracle method to check how many users there are: 1. Use the SQL*Plus command line interface, open the command line terminal, log in to the Oracle database, enter SELECT COUNT(*) FROM ALL_USERS to query; 2. Use Oracle SQL Developer, connect to the target database, enter SELECT COUNT(*) FROM ALL_USERS, click Run, and after execution, you can view the number of users, etc.

The operating environment of this tutorial: Windows 10 system, Oracle Database 20c version, DELL G3 computer.

Oracle is a relational database management system (RDBMS) that is widely used in enterprise-level data management and storage. In Oracle database, users are an important part of the database and are used to manage and maintain database objects and data. In this article, we will explore how to view the number of users in an Oracle database.

Users in Oracle database can be divided into two categories: system users and ordinary users. System users are users with special permissions and access rights used to manage and maintain database instances. Ordinary users are ordinary operating users in the database and only have permission to access and operate database objects.

To check the number of users in the Oracle database, you can use the following methods:

1. Use the SQL*Plus command line interface:

a. Open the command line terminal , and log in to the Oracle database.

b. Enter the following command to view the number of all users:

SELECT COUNT(*) FROM ALL_USERS;

c. After executing the command, all users in the database will be displayed quantity.

2. Use Oracle SQL Developer:

a. Open the Oracle SQL Developer tool and connect to the target database.

b. In the "Code Editor", enter the following SQL statement:

SELECT COUNT(*) FROM ALL_USERS;

c. Click the "Run" button to execute The above SQL statement.

d. After execution, the number of all users in the database will be displayed in the "Results" tab.

3. Using Oracle Enterprise Manager (OEM):

a. Open the Oracle Enterprise Manager console and connect to the target database.

b. Navigate to the Database tab and select the target database instance.

c. Click the "Users" tab and the list and number of all users will be displayed.

The above are three common methods to check the number of users in the Oracle database. No matter which method you choose, you'll get an accurate number of users. When performing any database management and maintenance operations, it is important to know the number of users in the database. In addition, you should also pay attention to the access control and permission settings of the database to ensure that only authorized users can access and operate the database.

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