Method and apparatus for performing consistent reads in multiple

Details Method and apparatus for performing consistent reads in multiple Method and apparatus for performing consistent reads in multiple

1997-02-28

1998-11-03

Black, Thomas G.

Data processing: database and file management or data structures

Database design

Data structure types

707 4, 707 10, 707204, 707103, 39520033, 39520047, 39520049, G06F 1730

Patent

active

058325212

ABSTRACT:
A method and apparatus for supplying a particular version of a data item to a transaction executing in a first database server is provided. The data item is in a database accessible by the first database server and one or more other database servers. The method involves determining whether a current version of the data item resides in a cache that is remote relative to the first database server. If the current version of the data item does not reside in a cache that is remote relative to the first database server, then a first derivation mechanism that is local to the first database server to derives the particular version of the data item from the current version of the data item. If the current version of the data item resides in a cache that is remote relative to the first database server, then a second derivation mechanism that is local to the cache derives the particular version of the data item from the current version of the data item. Once built, the particular version of the data item sent to the first database server. Determining whether a current version of the data item resides in a cache that is remote relative to the first database server may be performed by determining whether a process currently holds a write lock on the data item, and if a process currently holds a write lock on the data item, then determining whether the process is remote relative to the first database server.

REFERENCES:
patent: 5285494 (1994-02-01), Sprecher
patent: 5341478 (1994-08-01), Travis
patent: 5627886 (1997-05-01), Bowman
patent: 5706349 (1998-01-01), Aditham
patent: 5745748 (1998-04-01), Adham

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