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:
Sep. 11, 2012
Filed:
Mar. 26, 2008
Mei-lin Linda Lin, San Jose, CA (US);
Fei Zhou, Glenview, IL (US);
Joe Francis, Fremont, CA (US);
Srikanth Sampath, Fremont, CA (US);
Satya N. Ramachandran, Fremont, CA (US);
Gangavara Prasad Varakur, Livermore, CA (US);
Mei-Lin Linda Lin, San Jose, CA (US);
Fei Zhou, Glenview, IL (US);
Joe Francis, Fremont, CA (US);
Srikanth Sampath, Fremont, CA (US);
Satya N. Ramachandran, Fremont, CA (US);
Gangavara Prasad Varakur, Livermore, CA (US);
Sybase, Inc., Dublin, CA (US);
Abstract
A distributed database system providing data and space management methodology. In a distributed database system having an allocation page for tracking allocation and deallocation of data pages including a deallocation bit for tracking data page deallocation, a method for determining when to clear the deallocation bit during recovery comprises: during runtime operation, generating log records recording allocation and deallocation of data pages, setting the deallocation bit during deallocation of a data page by a transaction, and clearing the deallocation bit after the transaction has committed; during recovery following a failure, identifying a particular log record corresponding to the deallocation bit set during deallocation of a given data page; determining whether the deallocation of the given data page recorded in the particular log record committed prior to the failure; and if the deallocation of the given data page committed prior to the failure, clearing the deallocation bit.