MariaDB Enterprise Server InnoDB Schema Changes

In MariaDB Enterprise Server, InnoDB supports many different schema change operations. Many of the operations can be performed online with concurrent DML using little or no locking.

DDL Statements

InnoDB schema changes are performed using the following DDL statements:

About InnoDB Schema Changes and Online DDL

InnoDB schema changes and online DDL are performed with a wide range of statements:

  • Each operation supports a subset of the following algorithms: INSTANT, NOCOPY, INPLACE, or COPY.

  • By default, InnoDB will use the most efficient algorithm supported by an operation. This behavior can be changed by using the ALGORITHM clause with the ALTER TABLE statement or by changing the value of the alter_algorithm system variable.

  • Each operation supports a subset of the following locking strategies: NONE, SHARED, or EXCLUSIVE.

  • By default, InnoDB will use the most permissive locking strategy supported by an operation. This behavior can be changed by using the LOCK clause with the ALTER TABLE statement.

Feature

Detail

Resources

Operations support instant algorithm

Yes

Operations support no-copy algorithm

Yes

Operations support in-place algorithm

Yes

Adding a column

Yes

Dropping a column

Yes

Reordering columns

Yes

Changing a column to NULL

Yes

Changing a column to NOT NULL

Yes

Adding a new ENUM option

Yes

Adding a new SET option

Yes

Adding system versioning

Yes

Removing system versioning

Yes

Setting a column's DEFAULT

Yes

Removing a column's DEFAULT

Yes

Adding a primary key

Yes

Dropping a primary key

Yes

Adding an index

Yes

Dropping an index

Yes

Adding a foreign key

Yes

Dropping a foreign key

Yes

Setting the next AUTO_INCREMENT value

Yes

Setting the row format

Yes

Setting the block size for the Compressed row format

Yes

Enabling page compression

Yes

Setting the page compression level

Yes

Disabling page compression

Yes

Enabling data-at-rest encryption

Yes

Setting the encryption key ID

Yes

Disabling data-at-rest encryption

Yes

Adding a constraint

Yes

Dropping a constraint

Yes

Rebuilding the table

Yes

Renaming the table

Yes