Quantum Corporation

Other

Camden John Davis

Roderick B Wideman

Stephen P Lord

John Theodore Kline

Simon Cheng

Jeffrey D Leuschner

Douglas Alan Burling

Adam Manthei

Joshua Fitzsimmons Martin

Methods, apparatus, and other embodiments facilitate transitioning a database between two modes. The two modes include a mode where table information for separate tables in the database is stored in a single monolithic file and a mode where the table information for separate tables is stored in separate files. Conventional attempts to make this type of transition lock the database for an unacceptable amount of time. Example methods and apparatus make a copy of a database that is to be transitioned, lock the copy, make a second instance of the copy, and then perform the work necessary for the transition in the second instance. This allows the original database to remain running. When the second instance is complete, the second instance is synchronized to the original database and then the transition is completed by copying the second instance to the original or failing the original over to the second instance.

Database conversion from single monolithic file mode to one table per file and one file per table mode

Methods, apparatus, and other embodiments associated with performing personal deduplication on a mobile device are described. One example method includes accessing a personal or context sensitive deduplication repository, where the context is based on a time of use of the mobile device, a purpose of use of the mobile device, a location of the mobile device, or an application in use by the mobile device, selectively de-duplicating data arriving at the mobile device, and selectively de-duplicating data to be transmitted by the mobile device, where the deduplication is performed using the personal or context sensitive deduplication repository. Example methods and apparatus may employ a chunking and hashing deduplication approach, a vector deduplication approach, or a delta deduplication approach.

Mobile device agent for personal deduplication

The present invention is directed toward methods and systems for data de-duplication. More particularly, in various embodiments, the present invention provides systems and methods for data de-duplication that may utilize storage reclamation. In various embodiments, data de-duplication may be performed using data storage reclamation by reconciling a list of all active tags against a list of all tags present within the object store itself. Any tags found to be in the object store that have no corresponding active usage may then be deleted. In some embodiments additional steps may be taken to avoid race conditions in deleting tags that are needed by incoming data. In some embodiments the object store may request the lists. In other embodiments, a runtime list, in which each new tag is entered as they are returned from the object store. In another embodiment the object store may maintain this list directly.

Methods and systems for space management in data de-duplication

The present invention is directed toward methods and systems for data de-duplication. More particularly, in various embodiments, the present invention provides systems and methods for data de-duplication that may utilize a data de-duplication system that retrieves data from a data storage device in an order based on the location of blocks on the data storage device. Some embodiments break a data stream into multiple blocks of data and store the blocks of data on a data storage device of a data de-duplication system, wherein a code representing a redundant block of data is stored in place of the block of data. A location for each block of data may be stored. Additionally, the blocks may be read in an order that is determined based on the location of the blocks.

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Saint Paul, TX, United States of America

Camden John Davis