Oracle数据库关闭命令简介（关闭oracle的命令）

The Oracle database is one of the most widely used databases in the world, and understanding the different commands for managing it is critical for anyone using the software. Oracle databases have certain commands for stopping or shutting down the database. In this article, we’ll take a look at the basics of the Oracle database close command.

Oracle databases must be stopped or shut down to ensure data integrity and performance. When the Oracle database is stopped or shut down, all client sessions that are currently accessing the database are immediately disconnected. This is done to protect against data loss and to reduce processing load when the database is no longer needed.

The Oracle database close command is used to shut down the database. This command is part of the Oracle Database Utilities Package. To execute the command, use the following syntax:

SQL> shutdown immediate;

This command will immediately close all client sessions connected to the Oracle database. It is important to note that any uncommitted transactions will be lost. Therefore, it is recommended to commit any outstanding transactions before executing the command.

The Oracle database close command can also be used to initiate a graceful shutdown. This command will wait for all committed transactions to be completed before closing down the database. To perform a graceful shutdown, use the following syntax:

SQL> shutdown normal;

In addition to the close command, Oracle databases also provide commands for starting up and shutting down the database. The shutdown abort command is used to terminate the database without waiting for transactions to complete. This command should only be used as a last resort, as it could cause data integrity issues.

Finally, Oracle databases also provide a startup command, which is used to start the database. This command is used in conjunction with the close command, as it is used to restart the database after it has been shut down.

In summary, the Oracle database close command is used to terminate all client Sessions connected to the Oracle database, and any uncommitted transactions are lost. The Oracle database provides commands for starting and shutting down the database, as well as a graceful shutdown command. Understanding and correctly using these commands is essential for anyone working with Oracle databases.