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2. Rollback (data management) - Wikipedia

   en.wikipedia.org/wiki/Rollback_(data_management)

   SQL refers to Structured Query Language, a kind of language used to access, update and manipulate database. In SQL, ROLLBACK is a command that causes all data changes since the last START TRANSACTION or BEGIN to be discarded by the relational database management systems (RDBMS), so that the state of the data is "rolled back" to the way it was before those changes were made.

3. Database transaction - Wikipedia

   en.wikipedia.org/wiki/Database_transaction

   A database transaction symbolizes a unit of work, performed within a database management system (or similar system) against a database, that is treated in a coherent and reliable way independent of other transactions. A transaction generally represents any change in a database. Transactions in a database environment have two main purposes:

4. Liquibase - Wikipedia

   en.wikipedia.org/wiki/Liquibase

   Rollback database to "tag" SQL for Database Updates and Rollbacks can be saved for manual review; Stand-alone IDE and Eclipse plug-in "Contexts" for including/excluding change sets to execute; Database diff report; Database diff changelog generation; Ability to create changelog to generate an existing database; Database change documentation ...

5. Savepoint - Wikipedia

   en.wikipedia.org/wiki/Savepoint

   A savepoint is a way of implementing subtransactions (also known as nested transactions) within a relational database management system by indicating a point within a transaction that can be "rolled back to" without affecting any work done in the transaction before the savepoint was created. Multiple savepoints can exist within a single ...

6. Two-phase commit protocol - Wikipedia

   en.wikipedia.org/wiki/Two-phase_commit_protocol

   The coordinator sends a rollback message to all the participants. Each participant undoes the transaction using the undo log, and releases the resources and locks held during the transaction. Each participant sends an acknowledgement to the coordinator. The coordinator undoes the transaction when all acknowledgements have been received.

7. Database transaction schedule - Wikipedia

   en.wikipedia.org/wiki/Database_transaction_schedule

   The conflict is materialized if the requested conflicting operation is actually executed: in many cases a requested/issued conflicting operation by a transaction is delayed and even never executed, typically by a lock on the operation's object, held by another transaction, or when writing to a transaction's temporary private workspace and ...