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Update support in database content management
| Details |
Inventors: Hsiao, Hui-I; Narang, Inderpal Singh;
Assignee: International Business Machines Corporation (Armonk, NY)
Primary Examiner: Metjahic; Safet
Assistant Examiner: Chen; Te Yu
Attorney, Agent or Firm: Hall; David A. Heller Ehrman White & McAuliffe
A computer system updates a data object that is maintained in data storage external to a database management system (DBMS), after receiving an update request from a DBMS client for the data object, by first scheduling the update request with the DBMS to provide access to the external data object, then initiating a subtransaction in the DBMS for the update request, updating the data object with an in-place update action at the external data storage to thereby produce an updated data object and also updating the DBMS metadata of the data object, next appending information relating to type and time of the update action in an object version table, and then executing a backup operation of the updated data object. This permits update-in-place operations on the external data object, under supervision of the DBMS. The system thereby supports update-in-place operations on external data with access control, backup and recovery, and transaction consistency in accordance with a database management system, while avoiding large copy operations that would consume network resources. |
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DETAILED DESCRIPTION The present invention provides a computer system that updates a data object that is maintained in data storage external to a database management system (DBMS), after receiving an update request from a DBMS client for the data object, by first scheduling the update request with the DBMS to access the data object file, then initiating a sub-transaction in the DBMS for the update request to ensure consistency between the data object and corresponding metadata of the data object, next updating the data object with an in-place update action at the external data storage to thereby produce an updated data object and also updating the DLFM/DBMS metadata (DLFM is a sub-component of DBMS) of the data object, then appending information relating to type and time of the update action in a data object file version table, and then executing a backup operation of the updated data object.
This permits update-in-place operations on the external data object, under supervision of the DBMS.
In this way, the system supports update operations on external data with access control, backup and recovery, and transaction consistency in accordance with a database management system, while avoiding large copy operations that would consume network resources.
In one aspect of the invention, the computer system tracks version information on external data for which an update is pending, where the external data can comprise data objects such as text, images, video, or any other type of binary large object.
The data version information is maintained in a file version table that contains modification information used for coordinated recovery between a data object in the external file management system and corresponding metadata in the central database store.
Thus, a data object that is stored externally to the database management system is updated by scheduling a plurality of update requests from clients to access the object where the DBMS verifies the access permission of the client, a transaction is initiated by the database management system for one or more update requests to ensure consistency between the external data file and metadata of the file, then the external data file and its corresponding metadata are updated, and update modification information is registered in the version table
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Finance 
