The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 15, 1998
Filed:
Mar. 19, 1996
Oracle Corporation, Redwood Shores, CA (US);
Abstract
A method and system for recovering after a crash of an instance in a database is disclosed. According to the method, transaction information corresponding to all the transactions that existed in the failed instance is inspected. These transactions that were active at the time the instance crashed are marked as 'dead.' The database is made available to users after updating the transaction information and before undoing all of the changes or updates performed by dead transactions. The changes made by the dead transactions may be undone by new transactions on a on-demand basis after the database is made available. Specifically, when a new transaction is waiting to obtain a lock on a resource held by another transaction, the new transaction determines whether the owner of the lock is one of the dead transactions. If so, the new transaction rolls back some or all of the changes made by the dead transaction.