International Business Machines Corporation

Robert Daniel Love

Paul Michael Cadarette

Austin Willoughby

Robert Stanley Gensler, Jr

Terri A Menendez

Christopher M Holtz

Douglas Michael Frederick Hembry

Joseph L Kidd

Kyle Jeffrey Charlet

John Simon Tilling

Martin W Cocks

Robert William Kruppa

Gregg Andrew Upton

Anil Venkatesh Varkhedi

Kiran Challapalli

William Woollcott Ellington, Jr

Leo A Gladstein

Larry C Martin

Kathleen Miriam Wilhelm

Lawrence E Kirk

Kevin K Leong

Charles Joseph Weigel, Iii

Hiroshi Tsuji

James W Cullen

Provided are a computer program product, system, and method for replicating a source data set to a target data store. A point-in-time copy of the source data set is generated having a data structure identifying the data in the source data set as of a point-in-time. A restore operation is initiated to copy the source data set represented by the point-in-time copy to a restored copy of the source data set consistent with the source data set. The source data set records are transferred from the restored copy to the target data store in the target storage.

Replicating a source data set to a target data store

An application-level thread dispatcher that operates in a main full-weight operating system-level thread allocated to an application initializes at least one application-level pseudo threads that operates as an application-controlled thread within the main full-weight operating system-level thread allocated to the application. The application-level thread dispatcher migrates work associated with the application between the at least one application-level pseudo thread and a separate operating system-level thread in accordance with evaluated changes in run-time performance of the application.

Application-level dispatcher control of application-level pseudo threads and operating system threads

An application-level thread dispatcher that operates in a main full-weight thread allocated to an application is established. The application-level thread dispatcher initializes a group of application-level pseudo threads that operate as application-controlled threads within the main full-weight thread allocated to the application. The application-level thread dispatcher evaluates run-time performance of the application.

An application-level thread dispatcher that operates in a main full-weight thread allocated to an application is established. The application-level thread dispatcher initializes a group of application-level pseudo threads that operate as application-controlled threads within the main full-weight thread allocated to the application. The application-level thread dispatcher determines that at least one application-level pseudo thread meets configuration requirements to operate within a separate operating system-level thread in parallel with the main full-weight thread. In response to determining that the at least one application-level pseudo thread meets the configuration requirements to operate within the separate operating system-level thread in parallel with the main full-weight thread, the at least one application-level pseudo thread is dispatched from the main full-weight thread to the separate operating system-level thread by the application-level thread dispatcher.

Embodiments of the present invention provide a method, system and computer program product for consistent replication of transactional updates. In an embodiment of the invention, a method for consistent replication of data in a transaction processing system is provided. The method includes recording entries in a replication log of different data updates and corresponding transactions and additionally recording entries in the replication log indicating whether or not the transactions have been backed out. The method also includes replicating only those data updates referenced in the log which do not correspond to transactions indicated in the log to have been backed out. For instance the additionally recorded entries in the replication log indicate when a transaction has been backed out. Alternatively, the additionally recorded entries in the replication log indicate when a transaction has been committed.

Consistent replication of transactional updates

Provided are techniques for data stream switching. While accepting data change messages from a historical data stream, in response to determining that the end of the historical data stream is approaching, consumption from a real time data stream is resumed. In accepting data change messages from one of a historical data stream and a real time data stream, a data change message identifier (DCMID) for a data change message is obtained. Then, it is determined whether the data change message is from the real time data stream. In response to determining that the data change message is from the real time data stream, the DCMID is processed against a historical data structure to determine whether the related data change message has been seen in the historical data stream. In response to determining that the data change message is from the historical data stream, the DCMID is processed against a real time data structure to determine whether the related data change message has been seen in the real time data stream. It is determined whether a threshold for a number of DCMIDs that correspond to each other in the real time data stream and the historical data stream has been met. In response to determining that the threshold has been met, there is a switch from capturing data change messages in the historical data stream to capturing data change messages in the real time data stream.

Transitioning between historical and real time data streams in the processing of data change messages

A database definition, logical database view, extended field definition and control statement information are accessed to build an in-memory representation of selective information contained therein. Utilizing this in-memory representation, a class in one form is automatically generated and customized wherein this class is used to access a hierarchical database responsive to a hierarchical database access request from an application.

Method, computer program product, and system for automatic class generation with simultaneous customization and interchange capability

A system for identifying and utilizing a secondary index to access a database using a management system without an internal catalogue of online metadata. The system receives an application request to access a database from the application program, and parses the application request to determine at least one column name and at least one table name. The system utilizes an online catalogue containing metadata to translate the column name to a field name and the table name to a segment name, wherein the segment name has an associated secondary index. The system utilizes the online catalogue to determine an associated secondary index name, and builds a database request that includes the segment name, the field name, and the associated secondary index name. The system then sends the database request to the database management system, so that the associated secondary index can be used by the database management system in response to the database request.

System and method for identifying and utilizing a secondary index to access a database using a management system without an internal catalogue of online metadata

A database definition, logical database view, extended field definition and control statement information are accessed to build an in-memory representation of selective information contained therein. Utilizing this in-memory representation, a hierarchical database schema report is automatically generated wherein this hierarchical database schema report may be used to write application code to access the hierarchical database without further need to utilize the database definition, the extended field definition, the logical database view or any combination thereof.

Method, computer program product, and system for automatically generating a hierarchial database schema report to facilitate writing application code for accessing hierarchial databases

A converged service frame format is defined to support any-to-any connections between Ethernet and Token Ring LANs. The converged service frame format is a superset of standard Ethernet frame formats defined in IEEE 802.3 specifications. Where the frame source is an Ethernet LAN, an 802.1Q tag is added. Where the frame source is a Token Ring LAN, other operations are performed, including mapping of Token Ring priority bits into an appropriate field in the converged service frame. The operations required to map either an Ethernet or a Token Ring frame into the converged service frame are performed at an edge device at a point of ingress into an intervening network. The inverse operations required to restore the Ethernet or Token Ring frame are similarly performed in an edge device at a point of egress from the network.

Converged service for interconnected local area networks

A graphical user interface display window configurations containing user-readable data and is implemented by a software presentation system. The software presentation system automatically adjusts window size and positioning in accordance with window environment changes (e.g. changes in user readable data and/or window resolution). The method includes the steps of: establishing through operation of the presentation system, a display including windows with user-readable data; detecting a change in window environment; responding automatically to the change in window environment to determine windows in the display that require a size adjustment; recalculating the size of each window that requires adjustment; and operating a layout routine to reposition windows in the display in accordance with predetermined spacing and positioning parameters.

Display window layout system that automatically accommodates changes in

An FET substrate voltage generator circuit is disclosed for converting a single power supply and ground potential to a negative potential having an absolute value whose magnitude is greater than the power supply potential and applying that potential to the substrate of an integrated circuit upon which it is formed. The circuit dissipates less power per unit of current supplied by the circuit and occupies less space than do prior art circuits. The circuit applies the principle of voltage doubling to a first capacitor to achieve the desired voltage magnitude across a second capacitor and then applies the principle of a.c. coupling to that second capacitor connected through an impedance to the first capacitor, to achieve the desired polarity inversion for the substrate voltage to be generated. This circuit provides the current generating capacity necessary to drive the substrate to a negative voltage and sink the required current so as to maintain the substrate at an adequate negative bias.

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Littleton, NC, United States of America

Robert Daniel Love