Abstract: In accordance with an embodiment, described herein is a system and method for compacting a pseudo linear byte array, for use with supporting access to a database. A database driver (e.g., a Java Database Connectivity (JDBC) driver) provides access by software application clients to a database. When a result set (e.g., ResultSet) is returned for storage in a dynamic byte array (DBA), in response to a database query (e.g., a SELECT), the database driver determines if the DBA is underfilled and, if so, calculates the data size of the DBA, creates a static byte array (SBA) in a cache at the client, compacts the returned data into the SBA, and stores the data size as part of the metadata associated with the cache. In accordance with an embodiment, the DBA and the SBA can use a same interface for access by client applications.

Abstract: A system and method is described for database split generation in a massively parallel or distributed database environment including a plurality of databases and a data warehouse layer providing data summarization and querying functionality. A database table accessor of the system obtains, from an associated client application, a query for data in a table of the data warehouse layer, wherein the query includes a user preference. The system obtains table data representative of properties of the table, and determines a splits generator in accordance with one or more of the user preference or the properties of the table. The system generates, by the selected splits generator, table splits dividing the user query into a plurality of query splits, and outputs the plurality of query splits to an associated plurality of mappers for execution by the associated plurality of mappers of each of the plurality of query splits against the table.

Abstract: A system and method is described for database split generation in a massively parallel or distributed database environment including a plurality of databases and a data warehouse layer providing data summarization and querying functionality. A database table accessor of the system obtains, from an associated client application, a query for data in a table of the data warehouse layer, wherein the query includes a user preference. The system obtains table data representative of properties of the table, and determines a splits generator in accordance with one or more of the user preference or the properties of the table. The system generates, by the selected splits generator, table splits dividing the user query into a plurality of query splits, and outputs the plurality of query splits to an associated plurality of mappers for execution by the associated plurality of mappers of each of the plurality of query splits against the table.

Abstract: In accordance with an embodiment, described herein is a system and method for use of immutable accessors with dynamic byte arrays. In accordance with an embodiment, a database driver provides access by software applications executing at an application server to data at a database, including associating a result set cache manager with a pool of result set caches. Each result set cache can be associated with one or more immutable accessors. In response to receiving a request from an application, to access a set of data, the set of data from the database is received into a particular result set cache. In response to receiving a subsequent request for a same set of data, from a same or another application using a same or another database connection, access is provided to the immutable accessor associated with the particular result set cache, for use in accessing the data therein.

Abstract: A system and method for marshaling database data from a native interface layer, to a Java layer, using a linear array. In accordance with an embodiment, a request is received from a software application to query or access data stored at the database. At a database driver native interface layer, the system obtains cell data from the database, determines cell coordinates and a cell metadata, and linearizes the cell data if required. The linearized data is then flushed to a linear byte array in the database driver presentation layer, and the cell coordinates and cell metadata are provided for use by a compact data handler and the application in accessing the data.

Abstract: A system and method for transparent multi key-value weighted attributed connection using uni-tag connection pools. In accordance with an embodiment, a connection pool enables labeling of connections that software applications can use to access a database. A connection pool associated with a database enables tagging of connection pools at the database and allows applications to selectively obtain connections based on tags. A request is received from an application to query data from the database using a labeled connection or low-cost alternative. If a low-cost connection is found, but requires configuration, the system returns unmatched labels for use by the application in configuring its environment to use the connection. The system can also generate a tag for the connection. Upon subsequent release of the database session, the tag can be made available for subsequent use of the tag, or a tagged connection, by the same or by other applications.

Abstract: A system and method for efficient storage and retrieval of fragmented data using a pseudo linear dynamic byte array is provided. In accordance with an embodiment, the system comprises a database driver which provides access by a software application to a database. The database driver uses a dynamic byte array to enable access by the application to data in the database, including determining a size of a required data to be stored in memory, and successively allocating and copying the required data into the dynamic byte array as a succession of blocks. The data stored within the succession of blocks can then be accessed and provided to the application.

Abstract: Systems, methods, and other embodiments associated with collection access are described. One example system includes a data store to store a set of listener object identifiers. A listener object identifier identifies a member of a set (or collection) of listener objects. A Listener object initiates an action in response to an occurrence of an event associated with a member of a set of external logics. A member of the set of external logics invokes a notify process to trigger actions. The example system may also include storing the listener object identifiers in an array to allow instances of the notify process to operate in parallel.

Abstract: Systems, methods, and other embodiments associated with collection access are described. One example system includes a data store to store a set of listener object identifiers. A listener object identifier identifies a member of a set (or collection) of listener objects. A Listener object initiates an action in response to an occurrence of an event associated with a member of a set of external logics. A member of the set of external logics invokes a notify process to trigger actions. The example system may also include storing the listener object identifiers in an array to allow instances of the notify process to operate in parallel.