Intelligent page store for concurrent and consistent access to a database by a transaction processor and a query processor
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United States of America Patent
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May 31, 1994
Grant Date -
N/A
app pub date -
Feb 25, 1991
filing date -
Feb 25, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus, embodied in an Intelligent Page Store, for providing concurrent and consistent access to a functionally separate transaction entity and a query entity to a shared database, while maintaining a single physical copy of most of the data. The Intelligent Page Store contains shared disk storage, and an intelligent versioning mechanism allows simultaneous access by the transaction entity and the query entity to the shared data. The transaction entity is presented the current data and the query entity is presented a recent and consistent version of the data. A single copy of all but recently updated pages is maintained by the Intelligent Page Store. The query and transaction entities operate independently of each other and are separately optimized.
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