Abstract: Aspects of the present invention disclose a method, computer program product, and system for query execution in a multi-tenant cloud service. The method includes one or more processors determining category classes for service queries. The method further includes sending for execution, a selected number of service queries from one of the determined category classes to a shadow query engine. Respective service queries of the categorically classified service queries comprise a different set of configuration parameter values for the shadow query engine. The method further includes recording metadata for the selected number of service queries of the one category class executed on said shadow query engine. The method further includes determining correlations between the recorded metadata.

Abstract: In an approach for authentication of a username, a processor maintains a mapping of usernames and realms. A processor receives a username and a time-based one-time password code (TOTP code) for the username based on an authentication application. A processor, upon receiving the TOTP code: determines a realm from the mapping based on the received username and the received TOTP; and requests an entry of a credential relating to the username in the realm. A processor, upon receiving of the requested credential, authenticates the username by determining that the received credential matches an expected credential for the realm.

Abstract: A method for deleting a row from a table in a database system comprises logically deleting the row in the first table in the database system by inserting a key of the row into a corresponding row of a dedicated table in the database system; querying the dedicated table during a query against the first table to identify the corresponding row in the dedicated table; and in response to identifying the corresponding row in the dedicated table, deleting the row from the first table and the corresponding row from the dedicated table as part of query processing during a subsequent query.

Abstract: In an approach for authentication of a username, a processor maintains a mapping of usernames and realms. A processor receives a username and a time-based one-time password code (TOTP code) for the username based on an authentication application. A processor, upon receiving the TOTP code: determines a realm from the mapping based on the received username and the received TOTP; and requests an entry of a credential relating to the username in the realm. A processor, upon receiving of the requested credential, authenticates the username by determining that the received credential matches an expected credential for the realm.

Abstract: Aspects of the present invention disclose a method, computer program product, and system for query execution in a multi-tenant cloud service. The method includes one or more processors determining category classes for service queries. The method further includes sending for execution, a selected number of service queries from one of the determined category classes to a shadow query engine. Respective service queries of the categorically classified service queries comprise a different set of configuration parameter values for the shadow query engine. The method further includes recording metadata for the selected number of service queries of the one category class executed on said shadow query engine. The method further includes determining correlations between the recorded metadata.

Abstract: A portal system is provided for dynamically accessing a data source of components for use within a composite application by parsing the data source to identify the components matching a predetermined functionality specification standard indicating a specific functionality requirement for the components to possess. Then the identified components are ranked according to predetermined ranking criteria that has been adjusted to the composite application. Components are selected from the ranked identified components and also a list is defined of the selected usable components from the ranking. At least a subset of the selected usable components are stored in a local storage and the composite application is deployed from the selected usable components.

Abstract: A computer-implemented method for computer query processing and/or data-table management in a computer system. The method includes generating a table that exists as a first instance in a first database and as a second instance in a second database. The method includes generating a current replication batch of pooled changes of the first instance that committed at or before a first time. The method includes propagating changes specified in the current replication batch to the second instance. The method includes assigning a batch-ID of the current replication batch to the query. The method includes executing the query on the second instance using the batch-ID as a filter to exclude any changes that have an assigned batch-ID of a replication batch having committed later than the current replication batch. The method includes returning results of the query execution on the second instance.

Abstract: In an approach to storing data elements in a database, a database management unit provides a table-mapping file for enabling access to a table of a plurality of tables in a storage medium, the table-mapping file comprising a plurality of map records of a single table, a map record comprising information indicative of the table, a column of the table, a data section of the table, and a range of values of data elements included in the data section of the column. The unit receives a data element at the database via a communication interface, determines the table, column, and data section the data element is to be stored in, and stores the data element in the section file corresponding to the determined table, column and data section. The unit then updates the table-mapping file corresponding to the table, columns and data section the data element has been stored in.

Abstract: A method for deleting a row from a table in a database system comprises logically deleting the row in the first table in the database system by inserting a key of the row into a corresponding row of a dedicated table in the database system; querying the dedicated table during a query against the first table to identify the corresponding row in the dedicated table; and in response to identifying the corresponding row in the dedicated table, deleting the row from the first table and the corresponding row from the dedicated table as part of query processing during a subsequent query.

Abstract: A method, computer program product, and system for processing attribute value information for a data set. The method, computer program product, and system includes receiving a first data query on the data set. The first data query includes a condition on at least one attribute of the data set. While processing the first data query, data blocks containing records of the data set may be scanned. The data blocks contain first data blocks that are full. Attribute value information may be generated for the at least one attribute for the first data blocks. The attribute value information may be stored and a second data query involving a condition on at least one of the at least one attribute may be processed using the stored attribute value information.

Abstract: A first data table and a second table to be joined is determined. The first data table and the second data table have a join attribute. Data blocks of the first data table are stored on a storage device. An attribute value information for the join attribute for the data block of the first data table is determined. At least one partition for the first data table and the second table is defined using at least the attribute value information on the join attribute. Each partition of the at least one partition has a respective partition range of values of the join attribute. A pair wise partition join is processed on a first partition range of the determined partition ranges.

Abstract: The present invention relates to software development in a networked environment, and in particular to method and system for automatically assisted generation of composite applications (44) which are composed of a plurality of instantiable components, wherein a composite application infrastructure (CAI) component (15) handles application instances (19) during runtime and manages connections and data flow between said components of a composite application, and wherein a templating application infrastructure (TAI) component (13) manages templates (23) which contain references to said instantiable components.

Abstract: A computer program product and system include a first database engine that maintains a first database, a second database engine that maintains a second database, a table that has a first instance in the first database and a second instance in the second database, and program instructions to execute write transactions, asynchronously pool the changes of the first instance, responsive to receiving a query against the table, determine to execute the query against the second instance, identify a first time, define a current replication batch that selectively comprises the pooled changes of the transactions before the first time, asynchronously replicate the current replication batch, store each change, assign a batch-ID to the query, send the query and the batch-ID to the second engine, respond to the current replication batch being completed, by executing the query on the second instance, and return results of the query execution on the second instance.

Abstract: A first data table and a second table to be joined is determined. The first data table and the second data table have a join attribute. Data blocks of the first data table are stored on a storage device. An attribute value information for the join attribute for the data block of the first data table is determined. At least one partition for the first data table and the second table is defined using at least he attribute value information on the join attribute. Each partition of the at least one partition has a respective partition range of values of the join attribute. A pair wise partition join is processed on a first partition range of the determined partition ranges.

Abstract: A first data table and a second table to be joined is determined. The first data table and the second data table have a join attribute. Data blocks of the first data table are stored on a storage device. An attribute value information for the join attribute for the data block of the first data table is determined. At least one partition for the first data table and the second table is defined using at least he attribute value information on the join attribute. Each partition of the at least one partition has a respective partition range of values of the join attribute. A pair wise partition join is processed on a first partition range of the determined partition ranges.

Abstract: A computer-implemented method for computer query processing and/or data-table management in a computer system. The method includes generating a table that exists as a first instance in a first database and as a second instance in a second database. The method includes generating a current replication batch of pooled changes of the first instance that committed at or before a first time. The method includes propagating changes specified in the current replication batch to the second instance. The method includes assigning a batch-ID of the current replication batch to the query. The method includes executing the query on the second instance using the batch-ID as a filter to exclude any changes that have an assigned batch-ID of a replication batch having committed later than the current replication batch. The method includes returning results of the query execution on the second instance.

Abstract: A method for deleting a row from a table in a database system comprises logically deleting the row in the first table in the database system by inserting a key of the row into a corresponding row of a dedicated table in the database system; querying the dedicated table during a query against the first table to identify the corresponding row in the dedicated table; and in response to identifying the corresponding row in the dedicated table, deleting the row from the first table and the corresponding row from the dedicated table as part of query processing during a subsequent query.

Abstract: A system for automatically assisted generation of composite applications composed of instantiable components performs the steps of: a) dynamically accessing a data source of one or more components being potentially suitable for being used within the composite application, b) parsing the data source for a predetermined searched component according to a predetermined functionality specification standard, c) ranking found components according to predetermined ranking criteria, d) defining a list of selected usable components from the ranking, e) storing at least a subset of the selected components locally, and f) automatically deploying the composite application from the selected components.

Abstract: A method for deleting a row from a table in a database system comprises logically deleting the row in the first table in the database system by inserting a key of the row into a corresponding row of a dedicated table in the database system; querying the dedicated table during a query against the first table to identify the corresponding row in the dedicated table; and in response to identifying the corresponding row in the dedicated table, deleting the row from the first table and the corresponding row from the dedicated table as part of query processing during a subsequent query.

Abstract: A method includes, where a first database engine maintains a first database, a second database engine maintains a second database, and a table has a first instance in the first database and a second instance in the second database, executing write transactions, asynchronously pooling the changes of the first instance, and, in response to receiving a query against the table, determining to execute the query against the second instance. The method further includes identifying a first time, defining a current replication batch that selectively comprises the pooled changes of the transactions before the first time, asynchronously replicating the current replication batch, storing each change, assigning a batch-ID to the query, sending the query and the batch-ID to the second engine, responsive to the current replication batch being completed, executing the query on the second instance, and returning results of the query execution on the second instance.