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Does Oracle support DDL transactions?
Oracle Database Oracle does not support transactional DDL: the transaction is considered as closed when CREATE, DROP, RENAME or ALTER command is executed. If the transaction contains DML commands, the Oracle commits the transaction as a whole and then commits the DDL command as a separate transaction.
What are DDL transactions?
DDL is the abbreviation of Data Definition Language. In summary, a DDL is a language that allows defining your data structure. That is a DDL statement. In SQL, there’s a lot of DDL operations you can do, such as creating a table, renaming a table, creating or removing a column, converting a column to a new type, etc.
Can we ROLLBACK DDL commands in Oracle?
The Rollback statement undoes all changes for the current session up to the savepoint specified. When you execute a DDL operation, there is an implied commit after the DDL. Therefore, any rollbacks will only undo changes to the new save point – which is after the last DDL operation.
What happens when commit occurs in Oracle?
A transaction is a sequence of SQL statements that Oracle Database treats as a single unit. After you commit the transaction, the changes are visible to other users’ statements that execute after the commit. You can roll back (undo) any changes made during the transaction with the ROLLBACK statement (see ROLLBACK.
Is commit DCL?
Transactions do not apply to the Data Control Language (DCL) or Data Definition Language (DDL) portions (such as CREATE, DROP, ALTER, and so on) of the SQL language. DCL and DDL commands always force a commit, which in turn commits everything done before them.
Is the DDL statement in Oracle transactional?
DDL is not transactional in Oracle. From the 11.2 doc: Oracle Database implicitly commits the current transaction before and after every DDL statement. Is this answer outdated?
Can a DDL statement fail in another session?
No. In Oracle DDL statements themselves are not transactional. Running a DDL statement will implicitly commit any open transaction for that session before starting the actual work. In addition some statements, like an alter table statement, may fail if another session has an open transaction on the object being modified or one of its dependencies.
Can a DDL rollback apply to the outer transaction?
It is unclear whether the rollback applies to the wrapped DDL statements only, as-if the create schema started a save-point, or the outer transaction with possibly some prior DML statement. You still cannot avoid the commit after the last wrapped DDL statement complete successfully though.