These include statements that create data structures, such as tables or views, rules, and database events.

All data definition statements participate in transactions. Using one of these statements initiates a transaction if none was open, and any work performed by these statements is affected by the commit and rollback statements.

For more information about transactions, see How You Can Manage Transactions.

Two examples of this type are the set statement (including set autocommit and set lockmode) and the inquire_sql statement. The set statements do not take part in transactions and cannot be issued inside them.