# InnoDB Online DDL

- [InnoDB Online DDL Overview](https://mariadb.com/docs/server/server-usage/storage-engines/innodb/innodb-online-ddl/innodb-online-ddl-overview.md): An introduction to InnoDB's online DDL capabilities, detailing the ALGORITHM and LOCK clauses for controlling performance and concurrency during schema changes.
- [InnoDB Online DDL Operations with the INPLACE Alter Algorithm](https://mariadb.com/docs/server/server-usage/storage-engines/innodb/innodb-online-ddl/innodb-online-ddl-operations-with-the-inplace-alter-algorithm.md): Learn about operations supported by the INPLACE algorithm, which rebuilds the table but allows concurrent DML, offering a balance between performance and availability.
- [InnoDB Online DDL Operations with the INSTANT Alter Algorithm](https://mariadb.com/docs/server/server-usage/storage-engines/innodb/innodb-online-ddl/innodb-online-ddl-operations-with-the-instant-alter-algorithm.md): Discover the INSTANT algorithm, which modifies table metadata without rebuilding the table, enabling extremely fast schema changes like adding columns.
- [InnoDB Online DDL Operations with the NOCOPY Alter Algorithm](https://mariadb.com/docs/server/server-usage/storage-engines/innodb/innodb-online-ddl/innodb-online-ddl-operations-with-the-nocopy-alter-algorithm.md): Understand the NOCOPY algorithm, which avoids rebuilding the clustered index for certain operations like adding secondary indexes, significantly reducing I/O.
- [Instant ADD COLUMN for InnoDB](https://mariadb.com/docs/server/server-usage/storage-engines/innodb/innodb-online-ddl/instant-add-column-for-innodb.md): A focused guide on the Instant ADD COLUMN feature, explaining how it works by modifying metadata and its advantages over traditional table-rebuilding methods.


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