Texas Instruments Corporation

Chung C Wang

Robert W Peterson

Satish M Thatte

Vappala John Joseph

Thomas J Bannon

Stephen J Ford

David L Wells

Diana M Sparacin

Edward R Perez

James M Florence

Craig W Thompson

David H Rester

Carig W Thompson

Each element of a database may have multiple versions; the versions are partitioned into branches, and versions of a branch are ordered linearly according to their timestamps. Branches are timestamped and related to one another by a version graph. Each version of an element of a database is represented by a unique identifier, a timestamp, a branch name and a value. A new version of an element associated with a branch is created in response to an operation associated with the branch which would modify the element. An object graph in the database is represented independent of the branches and version; an application coded for elements in one version (and branch) can be reused for the same elements in a different version and (different branch) without any re-coding effort. Methods for long duration transactions, cooperative transactions and schema evolutions are provided.

Time-stamped database transaction and version management system

A method of using a display system having a spatial light modulator (14) to display holographic images. The spatial light modulator (14) generates images that represent vertical strips of a hologram. These images are de-magnified by a three-dimensional optics unit (18), in the horizontal direction so as to form image strips. A scanning mirror (45) scans the image strips in a series across an image plane at a rate sufficiently fast that the viewer perceives a composite hologram comprised of these image strips.

Holographic 3-D display system with spatial light modulator

Transaction and version management system

A system and method for database management for providing support for long-term storage and retrieval of objects created by application programs written at least in part in object-oriented programming languages consists of a plurality of software modules. These modules provide data definition language translation, object management, object translation, and persistent object storage service. Such system implements an object fault capability to reduce the number of interactions between the application, the database management system, and the database.

System and method for database management supporting object-oriented

Apparatus for scheduling at least two concurrent transactions accessing a shared data is provided. When a lock request is granted, the apparatus provides for constructing a history file for the shared data to show each data accessing transaction, and also provides for constructing a serialization graph with each node denoting an active transaction, and each directed edge denoting a dependency between two transactions. The serialization graph is searched for a cycle formed by transactions, and if any is found, the transactions are aborted and restarted.

System for accessing shared data using a serialization graph constructed

A method is disclosed for concurrency control in a system having both pessimistic and optimistic transactions, comprises the steps of entering locks on objects both for optimistic and pessimistic transactions, and validating an optimistic transaction at commit time by checking that all objects on which said optimistic transaction holds a lock have not become obsolete during the execution of said optimistic transaction. Further, a system is shown enabling optimistic and pessimistic transactions to coexist, comprising a lock table into which locks are entered for both optimistic and pessimistic transactions, a wait queue in which pessimistic transactions are entered to wait for locks held by either optimistic or pessimistic transactions, a conflict table which is referenced to determine if a lock held by a first transaction is a conflict lock with respect to a lock requested by a second transaction, and code connected to the lock table, wait queue, and conflict table. This code which is responsive to transaction requests, updates the lock table and the wait queue so that optimistic transactions do not wait for locks to release, whereas pessimistic transactions do wait for locks to release. Other systems and methods are also disclosed.

System for selectively registering and blocking requests initiated by

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Dallas, TX, United States of America

Chung C Wang