System for modifying a database using a transaction log
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United States of America Patent
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-
Sep 14, 1999
Grant Date -
N/A
app pub date -
Jul 25, 1997
filing date -
Jul 25, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention is a computer system for modifying a database which comprises a computer that modifies records stored in a database. In the process for modifying records in the database, addresses to memory locations in a disk storage unit are accessed during the commit phase by first checking the address space in a transaction log. The computer system of the present invention operates by committing transactions without locking out readers. This is possible because any changed data in the database is reflected in the transaction log and the log must be accessed prior to reading from the disk storage unit. As a result, the user sees changed data when the log is accessed, or if data has not been changed, the log merely directs the computer to the address in the original database storage where unchanged data is stored.
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