Глоссарий терминов Oracle
Перевод групповая фиксация транзакций
Описание E.g., a user commits a transaction. LGWR must write the transaction's redo entries to disk, and as this happens, other users issue COMMIT statements. But LGWR cannot write to the online redo log file to commit these transactions until it has completed its previous write operation. After the first transaction's entries are written to the online redo log file, the entire list of redo entries of waiting transactions (not yet committed) can be written to disk in one operation.