Abstract: A transaction processing system comprises a querying system and a logical database having an active database and a backup database. The querying system transmits a message for a transaction to the logical database for processing. The message is transmitted to the active database where the message is processed. The active database creates transaction state data based, in part, on the message. The active database transmits a response message to the querying system and forwards the original message to the backup database. The backup database processes the original message and creates its own transaction state data. The transaction state data in the backup database operationally matches the transaction state data in the active database so that if the active database fails, the backup database includes the requisite transaction state data necessary to complete the transaction. The querying system processes the response message and transmits a termination message to the logical database for processing.

Abstract: A database system comprises a plurality of replicated databases and a database provisioning system such that when a record needs to be updated, the database provisioning system selects one of the replicated databases as a selected database with the remaining databases being non-selected databases. The provisioning system transmits to each non-selected database update data for updating the record and pointer data that identifies the selected database. The update data is placed in a memory queue in each non-selected database while the pointer data is written into a pointer field in the record being updated in each non-selected database. The non-selected databases then each transmit a ready-to-commit acknowledgment to the provisioning system. The provisioning system then transmits the update data to the selected database. The pointer field of the record being updated in the selected database is reset indicating that the selected database has been selected.