Why does Oracle table have read-only permissions?

The reasons why Oracle tables have read-only permissions: 1. Data security can prevent unauthorized users from modifying or deleting the table; 2. Data consistency can prevent data conflicts and conflicts caused by concurrent reading and writing. Chaos; 3. Data protection can reduce unnecessary data modification operations; 4. Performance optimization can reduce data writing operations.

The operating environment of this tutorial: Windows 10 system, Oracle version 19c, DELL G3 computer.

Why does Oracle table have read-only permissions?

In Oracle database, table permissions are divided into various types such as read (SELECT), modification (INSERT, UPDATE, DELETE) and management (GRANT, REVOKE). However, typically, Oracle tables have read-only permissions by default. This is the result of Oracle database design philosophy and data security considerations.

Data security: Oracle, as an enterprise-level database management system, pays attention to data security and integrity. In order to avoid the risk of misoperation or improper modification of data, the table is set to read-only permission by default to ensure data security. This prevents unauthorized users from modifying or deleting the table, thereby reducing the risk of data tampering or loss.

Data consistency: Oracle database adopts AC (atomicity, consistency, isolation and durability) transaction model to ensure data consistency and reliability. If multiple users perform read and write operations on a table at the same time, data inconsistency may easily occur. By setting the table to read-only permissions, you can prevent data conflicts and confusion caused by concurrent reading and writing. Read-only permission can ensure the consistency of data when reading and ensure that the data read is the latest and correct.

Data protection: Oracle database provides a variety of data protection mechanisms, such as backup, recovery, logs, etc. Read-only permissions can reduce unnecessary data modification operations, thereby reducing the cost and complexity of data backup and recovery. At the same time, read-only permissions can also reduce the risk of accidental data damage or loss, improving data reliability and security.

Performance optimization: Oracle database performance optimization is one of the important tasks for database administrators and developers. By setting the table to read-only permissions, data writing operations can be reduced, thereby improving the read performance of the database. Read-only permissions can reduce lock competition and write conflicts, improve concurrency performance and system response speed.

Although Oracle tables have read-only permissions by default, database administrators can flexibly adjust table permissions according to specific needs. They can allow users to perform operations such as inserting, updating, and deleting operations on the table by granting users corresponding modification permissions. This can ensure the normal operation of the database and the security of the data based on actual business needs and security requirements.

To sum up, Oracle tables have read-only permissions by default to ensure data security, consistency, protection and performance optimization. Read-only permissions can reduce unnecessary data modification operations, reduce data risks and costs, and improve database performance and reliability. However, the database administrator can adjust the table permissions according to actual needs to meet the user's data reading and writing needs.

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