Can DDL Statements Be Rolled Back in Major SQL Databases?

Data Definition Language (DDL) Statement Rollback in Major SQL Databases

This article examines the transaction handling of Data Definition Language (DDL) statements—such as CREATE TABLE and ALTER TABLE—in popular SQL databases. Understanding this behavior is critical for database management.

PostgreSQL's Transactional DDL

PostgreSQL seamlessly integrates DDL and Data Manipulation Language (DML) statements within transactions. Consequently, CREATE TABLE and similar DDL commands can be rolled back.

MySQL's Non-Transactional DDL

Unlike PostgreSQL, MySQL's DDL statements are not transactional. Executing a DDL command in MySQL automatically commits any outstanding transactions.

SQLite's Transactional DDL

Similar to PostgreSQL, SQLite supports transactional DDL. CREATE TABLE and other DDL operations can be reliably rolled back.

Other Database Systems

The transactional nature of DDL varies across other database systems:

• Oracle Database: Oracle 11g and later versions offer optional edition-based redefinition, enabling DDL rollback. Older versions, however, implicitly commit transactions upon DDL execution.
• SQL Server: Supports transactional DDL.
• Sybase Adaptive Server: Supports transactional DDL.
• DB2: Supports transactional DDL.
• Informix: Supports transactional DDL.
• Firebird (Interbase): Supports transactional DDL.

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