What’s New in MySQL 9.3? Backup, JavaScript Support, and Group Replication Explained

MySQL 9.3 has been officially released, bringing significant enhancements to backup capabilities, the mysqldump tool, and user management options.

Backup improvements include a new --users option that creates logical backups of user accounts, generating convenient CREATE USER and GRANT statements. The --add-drop-user flag adds DROP USER commands to backup scripts, while --include-user and --exclude-user allow precise inclusion or exclusion of specific accounts.

For developers, MySQL 9.3 expands JavaScript stored procedure support. The Enterprise edition’s Multi‑Language Engine now fully supports the DECIMAL data type, storing it as a JavaScript string to preserve precision and offering flexible numeric handling. An integrated JavaScript Internationalization API simplifies localization tasks.

Library management gains asynchronous loading via the await keyword, and new statements ALTER LIBRARY and SHOW LIBRARY STATUS make library administration easier.

Query optimization is extended to handle more complex comparison predicates in WHERE and SELECT clauses, improving execution efficiency for sophisticated queries.

Group Replication receives a new Primary Election component that selects the most up‑to‑date secondary server during failover, reducing data inconsistency and downtime for high‑availability deployments.

Deprecated features such as the Version Tokens plugin have been removed, and the minimum value for replica_parallel_workers is now set to 1 to ensure stable replication performance.