https://mariadb.com/docs/server/server-usage/storage-engines/innodb/innodb-online-ddl/innodb-online-ddl-operations-with-the-instant-alter-algorithm
InnoDB Online DDL Operations with the INSTANT Alter Algorithm | Server | MariaDB Documentation
Discover the INSTANT algorithm, which modifies table metadata without rebuilding the table, enabling extremely fast schema changes like adding columns.
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https://www.percona.com/blog/impact-of-ddl-operations-on-aurora-mysql-readers/
Impact of DDL Operations on Aurora MySQL Readers - Percona
Mar 26, 2026 - Why you should avoid long-running transactions on Aurora readers when executing frequent DDL operations on the Writer.
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https://www.mongodb.com/es/docs/upcoming/reference/ddl-operations/
DDL Operations - Database Manual - MongoDB Docs
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