![]() Now we see, that Oracle does not allow us to delete a connected user and displays an error message: ORA-01940: cannot drop a user that is currently connected. Assuming that it does not contain any objects, we will not be using the CASCADE clause: DROP USER customer Let us try to drop this user by executing the DROP USER syntax. Let us imagine that we are working with another customer user that is currently connected. Note: If you use DROP USER as is in this case, you are going to get the following error: ORA-01922: CASCADE must be specified to drop ‘VISITOR’. For example, let us assume we have the visitor user that owns a couple of tables and we are going to delete it with all its belongings: DROP USER visitor CASCADE Īs a result, the visitor user and all the related objects will be deleted. DROP USER including contents with CASCADEĪs mentioned earlier, an Oracle user that owns any kind of objects can be dropped with the help of the CASCADE placed after the DROP USER keywords. Moreover, we will go over the scenario when we need to drop a user that is currently connected. ![]() Thus, we will take this difference into consideration. There is a substantial difference in approaches to dropping a user that owns some objects and a user that owns none. In this chapter, we suggest diving into the practical side of the matter by looking into some examples of how to delete a user with the help of the DROP USER statement. You should disable the flashback data archive first. Note: You cannot delete the user with a schema containing a table that uses a flashback data archive. The roles created by the dropped user will remain intact after the deletion. These views will not be removed but you will not be able to refresh them as the table does not exist anymore. However, if we are talking about the materialized views in other schemas that refer to the table in a dropped one, the scenario will not be the same. In such a scenario, these objects will be removed along with the dropped user even if they belong to a different schema. You might encounter a situation where some of the objects in the database refer to the schema objects owned by the user we are going to drop. There is another important thing to remember. To ensure that all the objects are dropped, add CASCADE before executing the command. In this syntax, it is important to specify the name of the user to be deleted after the DROP USER keywords. The CASCADE clause will help you make sure everything, including contents and datafiles, is deleted along with the owner shema.įor a better understanding of the DROP USER practical usage, take a look at the basic syntax of the command: DROP USER username CASCADE In case an Oracle user owns any database objects, this syntax is the only way to drop it. The next thing we are going to discuss is the DROP USER CASCADE command. Later in this article, we will figure out how to delete a user in Oracle despite these factors. The DROP USER command in Oracle will work for a user that owns no database objects and is not currently connected. The basic syntax to drop a user in Oracle looks like this: DROP USER username If you try to drop users SYS or SYSTEM, this will lead to your database corruption. Note: You must have the DROP USER privileges to successfully run the query. Additionally, with the DROP USER statement, you can remove the user’s schema objects as well. The main purpose of the statement is to delete a database user that you no longer need. To begin with, let us take a closer look at the syntax of the DROP USER command. Manage and delete users’ accounts easily!.Forcefully drop connected user in Oracle.DROP USER including contents with CASCADE. ![]() This tutorial is valid for all Oracle versions starting from 11g-12c and ending with 19c. Basically, there are two ways of achieving this goal: by using the Oracle DROP USER command or with the help of an Oracle IDE allowing you to automate the process. Sometimes, it is necessary to delete particular users from your Oracle database. ![]() You can easily adjust any Oracle database to meet your everyday requirements. Oracle is one of the most popular relational database management systems famous for its flexibility and convenience for information management.
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