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  2. Redo log - Wikipedia

    en.wikipedia.org/wiki/Redo_log

    Oracle must re-do all redo-log transactions that have both a BEGIN and a COMMIT entry (roll forward), and it must undo all transactions that have a BEGIN entry but no COMMIT entry (roll back). [6] (Re-doing a transaction in this context simply means applying the information in the redo log files to the database; the system does not re-run the ...

  3. Commit (data management) - Wikipedia

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

    The general format is to issue a BEGIN WORK (or BEGIN TRANSACTION, depending on the database vendor) statement, one or more SQL statements, and then the COMMIT statement. Alternatively, a ROLLBACK statement can be issued, which undoes all the work performed since BEGIN WORK was issued. A COMMIT statement will also release any existing ...

  4. Savepoint - Wikipedia

    en.wikipedia.org/wiki/Savepoint

    Issuing the commands ROLLBACK or COMMIT will also discard any savepoints created since the start of the main transaction. Savepoints are defined in the SQL standard and are supported by all established SQL relational databases, including PostgreSQL , Oracle Database , Microsoft SQL Server , MySQL , IBM Db2 , SQLite (since 3.6.8), Firebird , H2 ...

  5. Database transaction - Wikipedia

    en.wikipedia.org/wiki/Database_transaction

    A transaction is typically started using the command BEGIN (although the SQL standard specifies START TRANSACTION). When the system processes a COMMIT statement, the transaction ends with successful completion. A ROLLBACK statement can also end the transaction, undoing any work performed since BEGIN.

  6. 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.

  7. SQL syntax - Wikipedia

    en.wikipedia.org/wiki/SQL_syntax

    Once the COMMIT statement completes, the transaction's changes cannot be rolled back. COMMIT and ROLLBACK terminate the current transaction and release data locks. In the absence of a START TRANSACTION or similar statement, the semantics of SQL are implementation-dependent. The following example shows a classic transfer of funds transaction ...

  8. Turn on or off vacation response in New AOL Mail

    help.aol.com/articles/turn-on-or-off-vacation...

    6. Click Save. Turn on another response for specific domains. 1. Toggle on or off Add another response. 2. Enter up to 2 domains (like aol.com or yahoo.com). 3. Enter a different message in the box. 4. Click Save.

  9. Compensating transaction - Wikipedia

    en.wikipedia.org/wiki/Compensating_transaction

    For systems without a commit/rollback mechanism available, one can undo a failed transaction with a compensating transaction, which will bring the system back to its initial state. Typically, this is only a workaround which has to be implemented manually and cannot guarantee that the system always ends in a consistent state.