筆記 SQL Server 如何使用 TSQL 的方式更改 Collate, Collation (定序)。
使用指令的好處是可以先切換成 Single User Mode 完成調整 Collate 所需的獨佔權限，作業完成後再切換恢復。
ALTER DATABASE DatabaseName SET SINGLE_USER WITH ROLLBACK IMMEDIATE;
ALTER DATABASE [DatabaseName] COLLATE Chinese_Taiwan_Stroke_CI_AS
ALTER DATABASE DatabaseName SET MULTI_USER;
Collation in SQL Server is more than just a technical detail; it’s a fundamental aspect that influences data integrity, performance, compatibility, globalization support, and the overall scalability of a database. By understanding and carefully selecting the appropriate collation, you can ensure efficient, accurate, and flexible data management that aligns with your business needs and goals.
Data Integrity and Consistency:
- Explanation: Collation impacts how data is stored and retrieved. It ensures that data is consistently sorted and compared in a way that adheres to specific rules and standards, such as case sensitivity and accent sensitivity.
- Example: If your database stores data in multiple languages, a collation that supports Unicode characters ensures that all characters are stored and retrieved correctly.
- Impact: Using the correct collation preserves data integrity and prevents issues such as data mismatches and incorrect query results.
- Explanation: The right collation can enhance the performance of your database. This is because SQL Server can more efficiently sort and compare data when the collation aligns with the data’s nature and the way it is accessed.
- Example: For a database predominantly dealing with English text, choosing a collation designed for English characters can speed up sorting and querying operations.
- Impact: Optimized performance leads to faster query responses and overall improved user experience.
Application Compatibility and Development Efficiency:
- Explanation: Collation settings in SQL Server must align with the needs of the applications that access the database. Mismatches can lead to errors and inefficient data handling.
- Example: An application designed for a case-insensitive environment might not function correctly if connected to a database with a case-sensitive collation.
- Impact: Proper collation settings ensure compatibility with applications, leading to more efficient development and fewer runtime errors.
Globalization and Localization Support:
- Explanation: SQL Server’s collation settings play a vital role in globalization and localization strategies. They enable the database to handle multiple languages and cultural settings appropriately.
- Example: A database that needs to support both English and Arabic languages will require a collation that respects the linguistic rules of both languages.
- Impact: By supporting various languages and cultural norms, businesses can expand their reach and cater to a global audience more effectively.
Maintenance and Scalability:
- Explanation: Choosing the right collation at the outset simplifies maintenance and scalability of the database. It’s easier to expand or modify a database when its fundamental settings align with long-term needs.
- Example: Changing collation settings on a large, established database can be complex and risky. It’s much simpler when the database is designed with future expansion in mind.
- Impact: Scalability and ease of maintenance are crucial for the long-term success and adaptability of a database system.