Abstract: A method for providing database management system support to a source application configured to operate with a source database management system Is provided. The method comprises detecting database management system communications issued by the source application to the source database management system; and responsive to said database management systems communications, impersonating the source database management system to the source application.

Abstract: A method for providing database management system support to a source application configured to operate with a source database management system Is provided. The method comprises detecting database management system communications issued by the source application to the source database management system; and responsive to said database management systems communications, impersonating the source database management system to the source application.

Abstract: A system for controlling access to a downstream database management system (DMS) is provided. The system comprises an interface to maintain client connections with a plurality of upstream clients; a pooling component to establish a dynamic pool, and to selectively route each client connection to a pool; within each pool maintaining a queue comprising client database requests associated with particular client connections; and selectively granting access to the client database requests within each queue to at least one downstream DMS.

Abstract: A method for providing interoperability between a plurality of database management system. The method comprises a server communicably connected to a plugin-application; receiving, from the source application, a connection request; intercepting communications issued by the source application to a source database management system; and responsive to said intercepted communications, impersonating the source database management system as a target database management system.

Abstract: A system for controlling access to a downstream database management system (DMS) is provided. The system comprises an interface to maintain client connections with a plurality of upstream clients; a pooling component to establish a dynamic pool, and to selectively route each client connection to a pool; within each pool maintaining a queue comprising client database requests associated with particular client connections; and selectively granting access to the client database requests within each queue to at least one downstream DMS.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for dynamic partition selection. One of the methods includes receiving a representation of a query plan generated for a query, wherein the query plan includes a dynamic scan operator that represents a first computing node obtaining tuples of one or more partitions of a table from storage and transferring the tuples to a second computing node that executes a parent operator of the dynamic scan operator. A partition selector operator is generated corresponding to the dynamic scan operator. A location in the query plan is determined for the partition selector operator. A modified query plan is generated having the partition selector operator at the determined location.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for dynamic partition selection. One of the methods includes receiving a representation of a query plan generated for a query, wherein the query plan includes a dynamic scan operator that represents a first computing node obtaining tuples of one or more partitions of a table from storage and transferring the tuples to a second computing node that executes a parent operator of the dynamic scan operator. A partition selector operator is generated corresponding to the dynamic scan operator. A location in the query plan is determined for the partition selector operator. A modified query plan is generated having the partition selector operator at the determined location.

Abstract: A method for providing database management system support to a source application configured to operate with a source database management system Is provided. The method comprises detecting database management system communications issued by the source application to the source database management system and responsive to said database management systems communications, impersonating the source database management system to the source application.

Abstract: A computer readable storage medium comprises executable instructions to receive a query. A graph is built to represent jobs associated with the query. The jobs are assigned to parallel threads according to the graph.

Abstract: A method for providing database management system support to a source application configured to operate with a source database management system Is provided. The method comprises detecting database management system communications issued by the source application to the source database management system; and responsive to said database management systems communications, impersonating the source database management system to the source application.

Abstract: SQL queries are optimized to operate directly on compressed data (and obtain the correct result) rather than requiring that the data be first decompressed prior to processing a query. Certain characteristic pattern trees are mapped against a logical input query plan that includes certain logical operators such as a DECOMPRESS that precedes a JOIN or a GROUPBY in association with a COUNT to identify instances in the plan that match a characteristic pattern. Upon locating a match, the input query plan is transformed into a logically equivalent plan that operates correctly on compressed data, by analyzing the interplay of the semantics of logical query operations with the compressed data and substituting less costly structures and operations. DECOMPRESS operations are moved to operate subsequent to a JOIN or eliminated altogether, and COUNT operations are replaced by a different operation, such as SUM, that is logically equivalent for compressed data.

Abstract: Query optimizer accuracy is tested by measuring the actual execution times on a database of each of a plurality of alternative query plans for each of a plurality of queries, first ranking the plans by the actual execution times, then ranking the plans by estimated execution times, and correlating the two rankings by computing a rank correlation metric. The rank correlation metric is normalized so that different optimizers can be objectively compared.

Abstract: A method for providing interoperability between a plurality of database management system. The method comprises a server communicably connected to a plugin-application; receiving, from the source application, a connection request; intercepting communications issued by the source application to a source database management system; and responsive to said intercepted communications, impersonating the source database management system as a target database management system.

Abstract: A method, article of manufacture, and apparatus for processing information are disclosed. In some embodiments, this includes receiving a query plan, identifying a first work file based on the query plan, determining a first work file transaction ID associated with the first work file, determining a data transaction ID, comparing the first work file transaction ID and the data transaction ID, creating a second work file based on the query plan if the data transaction ID is greater than the first work file transaction ID, and storing the second work file in a storage device. In some embodiments, the second work file may be associated with a second work file transaction ID.

Abstract: A computer readable storage medium comprises executable instructions to receive a query. A graph is built to represent jobs associated with the query. The jobs are assigned to parallel threads according to the graph.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for dynamic partition selection. One of the methods includes receiving a representation of a query plan generated for a query, wherein the query plan includes a dynamic scan operator that represents a first computing node obtaining tuples of one or more partitions of a table from storage and transferring the tuples to a second computing node that executes a parent operator of the dynamic scan operator. A partition selector operator is generated corresponding to the dynamic scan operator. A location in the query plan is determined for the partition selector operator. A modified query plan is generated having the partition selector operator at the determined location.

Abstract: SQL queries are optimized to operate directly on compressed data (and obtain the correct result) rather than requiring that the data be first decompressed prior to processing a query. Certain characteristic pattern trees are mapped against a logical input query plan that includes certain logical operators such as a DECOMPRESS that precedes a JOIN or a GROUPBY in association with a COUNT to identify instances in the plan that match a characteristic pattern. Upon locating a match, the input query plan is transformed into a logically equivalent plan that operates correctly on compressed data, by analyzing the interplay of the semantics of logical query operations with the compressed data and substituting less costly structures and operations. DECOMPRESS operations are moved to operate subsequent to a JOIN or eliminated altogether, and COUNT operations are replaced by a different operation, such as SUM, that is logically equivalent for compressed data.

Abstract: A system for controlling access to a downstream database management system (DMS) is provided. The system comprises an interface to maintain client connections with a plurality of upstream clients; a pooling component to establish a dynamic pool, and to selectively route each client connection to a pool; within each pool maintaining a queue comprising client database requests associated with particular client connections; and selectively granting access to the client database requests within each queue to at least one downstream DMS.

Abstract: A method for providing database management system support to a source application configured to operate with a source database management system Is provided. The method comprises detecting database management system communications issued by the source application to the source database management system and responsive to said database management systems communications, impersonating the source database management system to the source application.

Abstract: SQL queries are optimized to operate directly on compressed data (and obtain the correct result) rather than requiring that the data be first decompressed prior to processing a query. Certain characteristic pattern trees are mapped against a logical input query plan that includes certain logical operators such as a DECOMPRESS that precedes a JOIN or a GROUPBY in association with a COUNT to identify instances in the plan that match a characteristic pattern. Upon locating a match, the input query plan is transformed into a logically equivalent plan that operates correctly on compressed data, by analyzing the interplay of the semantics of logical query operations with the compressed data and substituting less costly structures and operations. DECOMPRESS operations are moved to operate subsequent to a JOIN or eliminated altogether, and COUNT operations are replaced by a different operation, such as SUM, that is logically equivalent for compressed data.