Oracle数据库操作之无需提交（oracle 不提交）

Introduction

Oracle database is one of the most popular relational database management systems (RDBMS) used by businesses and organizations around the world. Oracle offers a wide range of features and functionalities that allow users to manage and manipulate their data efficiently. One of the key features of Oracle database is the ability to make changes to the database without submitting.

What is Submitting in Oracle Database?

Submitting refers to the process of committing changes made to a database. When a user performs a transaction in Oracle database, the transaction remns in a pending state until they submit their changes. This means that any other user who wants to access the data will not be able to see these changes until they are submitted. Without submitting, even if a user exits the database or their session ends, the changes will not be saved to the database.

Why Should You Avoid Submitting in Oracle Database?

Submitting in Oracle database may cause several issues, such as inconsistencies and locks. When a user submits their changes, they are locking the data until the transaction is completed. This lock prevents other users from accessing the same data, causing delays and inconsistencies in the database. Additionally, submitting is also a time-consuming process that can significantly slow down database performance, especially when dealing with large amounts of data.

How to Make Changes in Oracle Database without Submitting?

Oracle has introduced the NOLOGGING feature, which allows users to make changes to the database without submitting. This feature is ideal for situations where users need to make temporary changes to the database, such as during testing or data analysis. The NOLOGGING feature works by temporarily disabling the writing of redo logs, which are used to track changes to the database.

To enable the NOLOGGING feature, you need to execute the following SQL statement:

ALTER DATABASE NOARCHIVELOG;

This will turn off the automatic archiving of redo logs, allowing you to make changes without submitting. However, it is important to note that this feature should only be used in specific situations, as it can compromise data integrity and may not be recoverable in case of a database flure.

Conclusion

In conclusion, the NOLOGGING feature in Oracle database allows users to make changes to the database without submitting. While this feature is useful for temporary changes and testing purposes, it should be used with caution, as it can compromise data integrity and may not be recoverable in case of a database flure. Therefore, it is recommended to only use the NOLOGGING feature in specific situations where its benefits outweigh the risks.