Red Hat, Inc.

Other

Filip Nguyen

Filip Elias

Filip Eliás

Rostislav Svoboda

Marek Baluch

Martin Vecera

Pavel Slavicek

Pavel Slavícek

Robert Balent

Methods, systems, and computer program products for optimization of query processing in a data federation system using priority queuing techniques are provided. Priority queuing techniques may include generating a query vector corresponding to a query, comparing the query vector to historical query vectors to determine similarity, determining an expected processing time for the query based on the determined similarity, and inserting the query into a priority ordered queue at a particular position based on the expected processing time.

Federation optimization using ordered queues

An example method for reducing data communications includes receiving, at a data hub, a first set of messages from a first device. Each message of the first set includes a value. The method also includes sending one or more messages of the first set to one or more devices. The method further includes receiving a second set of messages from a second device. Each message of the second set indicates whether a state change occurred in the second device for one or more values included in the first set. The method also includes computing a value interval based on the one or more values associated with the first set. Values within the value interval were indicated in the second set as causing a state change in the second device. The method further includes configuring the first device to transmit messages for values within the value interval.

Data reduction in a system

Systems and methods for modifying bytecode at runtime are provided. A virtual machine can execute bytecode of an application. The virtual machine can receive a modification for the application that includes modified bytecode for the application. The virtual machine can identify a portion of the bytecode of the application that corresponds to the modified bytecode. The virtual machine can update the portion of the bytecode of the application at runtime using the modification.

Bytecode modification

A method and system for password mediation including receiving, within an operating system network stack of a client device, a hypertext transfer protocol (HTTP) request message issued by a client application executing on the client device, the HTTP request message indicating an operation to be performed for a user of the client application at a destination system; requesting, by the client device, security information for the user with respect to the destination system; modifying, by the client device, the received HTTP request message to include the security information; and sending, by the client device, the modified HTTP request message to the destination system.

HTTP password mediator

Methods, systems, and computer program products for processing a query to determine query results. The query may be analyzed to determine a constant column pair corresponding to the query. The column constant pair may be analyzed with respect to a column constant pair associated with a partitioned data set in order to route the query to a subset of the data set. Data sets may be partitioned into subsets by analyzing historical queries to determine a partitioning column constant pair with respect to the data set that is used to partition the data of the data set into subsets. The query processing may include both query routing and data set partitioning.

Multisource semantic partitioning

According to one example, a method performed by a computing system includes, with a first server, receiving a process request, starting processing of the process request, prior to completing the processing of the process request, storing objects associated with a thread of the process request in an object database that is accessible by the second server, storing thread metadata for the thread of the process request in a metadata database that is accessible by the second server, and sending a transfer request to a switching manager, the transfer request being to request that the process request be shifted to the second server.

Process transfer between servers

An example method of processing a query includes receiving a partial query including an identifier that identifies a full query corresponding to the partial query. The partial query is sent from a client and includes a command to select data from a database table stored in a database. The method also includes determining whether the table has been updated since a previous result set was sent to the client. The method further includes generating a partial result set including an indication of the updates to the table since the previous result set was sent to the client. The method also includes sending the partial result set to the client. The partial result set is an incomplete result set of the partial query.

Obtaining incremental updates from a database using a partial query

An example method of controlling access to data stored in a plurality of autonomous data sources includes receiving a federated query including a plurality of source queries. The method also includes receiving a request to submit a source query to a target data source. The method further includes determining whether the request matches at least one rule stored in a rules database. A rule that includes a given query matches a request that includes the given query. The method also includes when it is determined that the request does not match a rule stored in the rules database, sending a communication to cause (i) the source query to be submitted to the data source, and (ii) an initial result of the source query to be masked. The initial result of the source query has the same structure as the masked result of the source query.

Method and system for providing security in a data federation system

An example method of processing a query at a plurality of storage devices includes receiving a dual query from a client and generating a synchronous query and an asynchronous query based on the dual query. The dual query includes a set of conditions for selecting data from a set of database tables. The method further includes sending the synchronous query to a first storage device, sending the asynchronous query to a second storage device, and receiving a result set of the synchronous query. The result set of the synchronous query includes data selected from a set of database records in a set of primary database tables, which is stored in the first storage device and is a subset of the set of database tables. The method further includes marking a database record. A marked database record indicates usage of the data selected from the database record within a time period.

Dual overlay query processing

Various examples are directed to systems and methods for managing a database to include data from an external data source. A database engine may receive a request to add a reference column to a database described by a database schema. The request may comprise a location parameter describing a location of the external data source comprising data for populating the reference column and a data identifying parameter describing data at the external data source for populating the reference column. The database engine may modify the database schema to include the reference column, send a query to the external data source to obtain at least one data item for populating the reference column, and populate the reference column with the at least one data item.

Incorporating external data into a database schema

A mechanism for managing data operations in an integrated database system. The method includes receiving a request to perform a data operation and retrieving a data set from a primary data source (PDS) in view of the request. The method also includes storing the data set in a temporary data store (TDS). The method further includes performing the data operation on the stored data set in the TDS.

Managing data operations in an integrated database system

A mechanism for managing data in relational database management systems (RDBMS). The method includes receiving a structured query language (SQL) query to be executed on a relational database management system (RDBMS). The RDBMS includes a schema of tables divided into a plurality of partitions and the SQL query includes an operation of data to be executed on the RDBMS. The method also includes determining whether the SQL query is a valid SQLquery. The SQL query is a valid SQLquery when the SQL query includes a join operation applied to data from tables in a same partition of the plurality of partitions.

Managing data in relational database management system

A mechanism for providing context simulation. A method includes receiving context relay from a client machine. The context relay includes context input set (CIS) and configuration difference (diff) data. The method also includes applying the diff data to an application so that configuration settings of the application are same as the configuration settings of a first application on the client machine. The method also includes retrieving message information from the CIS and sending the message information to the application. The method further includes executing the application in same interval as the first application being executed on the client machine.

Providing context simulation

Various examples are directed to systems and methods for managing a database organized according to a schema. The database may comprise a database file corresponding to a table described by the schema. The database file may comprise a first row entry corresponding to a first row of the table. The first row entry may comprise at least one data item. A command may be received. The command may modify a first data item in the first row of the table. An indication of the modified value for the first data item may be written to a change location at the first file. The first entry may be modified to include a pointer to the indication of the modified value for the first data item.

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Brno, Czechia

Filip Nguyen