Abstract: Method for making a consistent checkpoint of a page including at least one data object in a computer system having a primary and secondary storage, and a programmable software. The primary storage has at least one page which includes at least one original data object on the page. The computer system allows at least one write operation to modify at least one data object, and the page is written into the secondary storage during checkpointing. The method includes beginning the checkpointing, including at least one page in the primary storage into a group of pages to be checkpointed, altering at least one data object with at least one data write operation, marking at least one data object resulting from the data write operation, writing at least one of the data objects into the secondary storage, and altering the state of the pending data object to be the original data object.

Abstract: An apparatus for synchronizing data between DBMSs has a first DBMS and a second DBMS. The second DBMS has a storage for persistently storing data items in a form of a storage structure, i.e. database. The second DBMS has also a second data storage for persistently storing data in a form of a sequential order, i.e. a transaction log. The data to be synchronized from the first DBMS to the second DBMS is analysed and based on the analyzing, it is decided how to persistently store the data between the first and the second data storage in the second DBMS. There can be decided how to store the data between the first and the second data storage. The characteristics of the data to be stored may influence on the storage between the first and the second data storage. Thus, the storage depends on the actual data to be stored.

Abstract: An apparatus for synchronizing data between DBMSs has a first DBMS and a second DBMS. The second DBMS has a storage for persistently storing data items in a form of a storage structure, i.e. database. The second DBMS has also a second data storage for persistently storing data in a form of a sequential order, i.e. a transaction log. The data to be synchronized from the first DBMS to the second DBMS is analysed and based on the analyzing, it is decided how to persistently store the data between the first and the second data storage in the second DBMS. There can be decided how to store the data between the first and the second data storage. The characteristics of the data to be stored may influence on the storage between the first and the second data storage. Thus, the storage depends on the actual data to be stored.

Abstract: Method for making a consistent checkpoint of a page including at least one data object in a computer system having a primary and secondary storage, and a programmable software. The primary storage has at least one page which includes at least one original data object on the page. The computer system allows at least one write operation to modify at least one data object, and the page is written into the secondary storage during checkpointing. The method includes beginning the checkpointing, including at least one page in the primary storage into a group of pages to be checkpointed, altering at least one data object with at least one data write operation, marking at least one data object resulting from the data write operation, writing at least one of the data objects into the secondary storage, and altering the state of the pending data object to be the original data object.

Abstract: This invention relates generally to database servers and computer systems and, more particularly, describes the mechanism to run transaction operations originating from a primary server used to replicate data in parallel in a secondary server. Especially the invention relates to running concurrent or parallel operations in a secondary server for redundancy, recovery and propagated transactions. This invention describes how parallel operation in a secondary server improves performance and availability and how it maintains transaction order and output congruent with the primary server where transaction operations are originated.

Abstract: This invention relates generally to database servers and computer systems and, more particularly, describes the mechanism to run transaction operations originating from a primary server used to replicate data in parallel in a secondary server. Especially the invention relates to running concurrent or parallel operations in a secondary server for redundancy, recovery and propagated transactions. This invention describes how parallel operation in a secondary server improves performance and availability and how it maintains transaction order and output congruent with the primary server where transaction operations are originated.