Abstract: A system, method and computer program product for detecting data omissions between intermittently-connected devices. An example system includes a client device configured to execute client queries on a client data set, and generate client result sets. The client queries and client result sets are stored on a query queue as queued queries and queued result sets. The system includes a server device with a data omission detector and server database. The data omission detector receives the queued queries and queued result sets after detecting a network connection, executes server queries on the server database and generates server result sets. The server queries are based on the queued queries. The data omission detector compares the server result sets with queued result sets to determine if there are data omissions. Data omissions include data absent in the queued result set that is present in a server result set.

Abstract: A system, method and computer program product for detecting data omissions between intermittently-connected devices. An example system includes a client device configured to execute client queries on a client data set, and generate client result sets. The client queries and client result sets are stored on a query queue as queued queries and queued result sets. The system includes a server device with a data omission detector and server database. The data omission detector receives the queued queries and queued result sets after detecting a network connection, executes server queries on the server database and generates server result sets. The server queries are based on the queued queries. The data omission detector compares the server result sets with queued result sets to determine if there are data omissions. Data omissions include data absent in the queued result set that is present in a server result set.

Abstract: Techniques for constructing a software application are provided. A data model of the application is represented as a relational model. Control logic of the application is defined to specify each of a plurality of operations of the application as a mapping from a current state of the application data model and one or more current application inputs to a new state of the application data model and one or more application outputs, described by one or more relational algebra operations selected from the group consisting of a relation-complement operation, a disjunction operation and a conjunction operation.

Abstract: A method, system and computer program product for flexible service configuration. In one embodiment, the method includes receiving a procedure request to perform a procedure at a target server, detecting by the target server at least one deficient parameter in the procedure request, suspending processing of the procedure request, sending a request by the target server for additional information from a middleware system to correct the at least one deficient parameter in the procedure request, and resuming the procedure request upon receiving the additional information.

Abstract: A method for dynamically deploying an application in a client-server environment includes evaluating at least one constraint of at least one of the application or the client-server environment and partitioning the placement and execution of components of the application in the client-server environment dynamically at runtime according to the at least one constraint.

Abstract: An on-demand manager provides an improved distributed data processing system for facilitating dynamic allocation of computing resources among multiple domains based on a current workload and service level agreements. Based on a service level agreement, the on-demand manager monitors and predicts the load on the system. If the current or predicted load cannot be handled with the current system configuration, the on-demand manager determines additional resources needed to handle the workload. If the service level agreement violations cannot be handled by reconfiguring resources at a domain, the on-demand manager sends a resource request to other domains. These other domains analyze their own commitments and may accept the resource request, reject the request, or counter-propose with an offer of resources and a corresponding service level agreement.

Abstract: A cache is configured as a hybrid disk-overflow system in which data sets generated by applications running in a distributed computing system are stored in a fast access memory portion of cache, e.g., in random access memory and are moved to a slower access memory portion of cache, e.g., persistent durable memory such as a solid state disk. Each data set includes application-defined key data and bulk data. The bulk data are moved to slab-allocated slower access memory while the key data are maintained in fast access memory. A pointer to the location within the slower access memory containing the bulk data is stored in the fast access memory in association with the key data. Applications call data sets within the cache using the key data, and the pointers facilitate access, management and manipulation of the associated bulk data. Access, management and manipulation occur asynchronously with the application calls.

Abstract: Techniques for constructing a software application are provided. A data model of the application is represented as a relational model. Control logic of the application is defined to specify each of a plurality of operations of the application as a mapping from a current state of the application data model and one or more current application inputs to a new state of the application data model and one or more application outputs, described by one or more relational algebra operations selected from the group consisting of a relation-complement operation, a disjunction operation and a conjunction operation.

Abstract: Techniques for constructing a software application are provided. A data model of the application is represented as a relational model. Control logic of the application is defined to specify each of a plurality of operations of the application as a mapping from a current state of the application data model and one or more current application inputs to a new state of the application data model and one or more application outputs, described by one or more relational algebra operations selected from the group consisting of a relation-complement operation, a disjunction operation and a conjunction operation.

Abstract: A method, system and computer program product for retrieving data records to a client computer. An identifier of a base query is received from the client computer. The base query is configured to select a set of data records from a database that the client computer has permission to access. A modifying clause is also received from the client computer. The modifying clause comprises a directive restricting the set of data records to a subset of data records. The modifying clause may optionally comprise an expression for sorting. A combined query is generated from the base query and the modifying clause. The query is configured to return the subset of data records. The combined query is further configured to sort the subset of data records based on the value of the expression if the expression is present. The combined query is executed at the database.

Abstract: A database manager, computer program product and methods for managing a database utilized by multiple applications. In one embodiment, the database manager performs a database record change to database records by a first application. The database manager branches the database records such that the database record change is visible to the first application and is not visible to one or more other applications accessing the database. The database manager can merge database record changes made by the other applications such that database schema changes made by the other applications are visible to the first application.

Abstract: Techniques are provided which enable relaxed transactional isolation and optimistic concurrency control in a distributed client-server architecture, and which address the problems of server overloading and network delays known to exist in conventional distributed client-server architectures. In particular, the invention preferably provides client-side caching techniques which advantageously serve to reduce server overloading and effects of network delay.

Abstract: In accordance with a dual-MVC (Model-View-Controller) approach of the invention, the client machine maintains part of the Model, eliminating many round-trips to the server. The invention provides an implementation approach for constructing the frame(s) contained in the client's browser software to allow it to be refreshed locally. The invention addresses development and maintenance by specifying a library of functions that a programmer can use to construct the View and Controller on the client machine. When part of the Model is maintained on the client, the client has the ability to respond to user interaction without paying the performance penalty of continually interacting with the server.

Abstract: A method for dynamically deploying an application in a client-server environment includes evaluating at least one constraint of at least one of the application or the client-server environment and partitioning the placement and execution of components of the application in the client-server environment dynamically at runtime according to the at least one constraint.

Abstract: Techniques for constructing a software application are provided. A data model of the application is represented as a relational model. Control logic of the application is defined to specify each of a plurality of operations of the application as a mapping from a current state of the application data model and one or more current application inputs to a new state of the application data model and one or more application outputs, described by one or more relational algebra operations selected from the group consisting of a relation-complement operation, a disjunction operation and a conjunction operation.

Abstract: A method, system and computer program product for retrieving data records to a client computer. An identifier of a base query is received from the client computer. The base query is configured to select a set of data records from a database that the client computer has permission to access. A modifying clause is also received from the client computer. The modifying clause comprises a directive restricting the set of data records to a subset of data records. The modifying clause may optionally comprise an expression for sorting. A combined query is generated from the base query and the modifying clause. The query is configured to return the subset of data records. The combined query is further configured to sort the subset of data records based on the value of the expression if the expression is present. The combined query is executed at the database.

Abstract: A system, method and computer program product for synchronizing replicas of shared data structures associated with one or more computer systems. The method comprises: evaluating a metric for performing a replica synchronization operation on a first computer system according to a first synchronization method; evaluating the metric for performing a replica synchronization operation on the first computer system according to a second synchronization method; and, selecting, at synchronization time, based on the evaluated metric, whether to use the first or second synchronization methods, and communicating a command to a second computer system to replicate a shared data structure based on the selected synchronization method.

Abstract: A method, system and computer program product for flexible service configuration. In one embodiment, the method includes receiving a procedure request to perform a procedure at a target server, detecting by the target server at least one deficient parameter in the procedure request, suspending processing of the procedure request, sending a request by the target server for additional information from a middleware system to correct the at least one deficient parameter in the procedure request, and resuming the procedure request upon receiving the additional information.

Abstract: A method and apparatus for constructing a software application with a plurality of screens. Operations performed in the method include representing a data model of the computer application as a relational model, providing a first screen of the computer application representing a current state of the data model, using relational algebra to define control logic of the computer application as a mapping from the current state of the data model and zero or more current application inputs to a new state of the data model and zero or more application outputs, using relational algebra to specify the selection of a second screen as a function of the current state of the data model and zero or more current application inputs, and generating computer executable code displaying the first screen and the second screen on a display.

Abstract: A system, method and computer program product for synchronizing replicas of shared data structures associated with one or more computer systems. The method comprises: evaluating a metric for performing a replica synchronization operation on a first computer system according to a first synchronization method; evaluating the metric for performing a replica synchronization operation on the first computer system according to a second synchronization method; and, selecting, at synchronization time, based on the evaluated metric, whether to use the first or second synchronization methods, and communicating a command to a second computer system to replicate a shared data structure based on the selected synchronization method.