Can DDL Statements Be Rolled Back in SQL Databases?

Can DDL statements in SQL database be rolled back?

Data Definition Language (DDL) statements such as CREATE TABLE and ALTER TABLE play a vital role in database management. However, the ability to rollback after executing a DDL statement varies among the major SQL databases. Here's a breakdown of how each database handles DDL transactions:

PostgreSQL

PostgreSQL supports transactional DDL, allowing statements such as CREATE TABLE to be rolled back within a transaction. This feature ensures data integrity and consistency even during complex DDL operations.

MySQL

Unlike PostgreSQL, MySQL does not support transactional DDL by default. DDL statements in MySQL cause implicit commits and cannot be rolled back once executed. Therefore, you must be careful when using DDL in MySQL.

SQLite

SQLite is a popular embedded database that also supports transactional DDL. Similar to PostgreSQL, CREATE TABLE and other DDL statements in SQLite can be rolled back within a transaction, providing greater flexibility and security.

Other databases

The other major SQL databases handle DDL transactions differently:

• Oracle 11g: Support for transactional DDL via version-based redefinition.
• Old Oracle: Transactional DDL is not supported; DDL causes implicit commits.
• SQL Server: supports transactional DDL.
• Sybase Adaptive Server: Support for transactional DDL.
• DB2: supports transactional DDL.
• Informix: Support transactional DDL.
• Firebird: supports transactional DDL.

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