Abstract:
A computer-implemented method, system, and/or computer program product optimizes an order of execution of column join operations. A first partitioning of the first data column splits the first data column into first subsets of rows. A second partitioning of the second data column splits the second data column into a second subsets of rows. A first value frequency information indicates a frequency of attribute values within a subset of rows of the first data column processed. A second value frequency information indicates a frequency of attribute values within a subset of rows of the second data column. Cardinalities of sub-tables derived by a respective joining of the subsets of rows of the first and second data columns are estimated, based on the first and second value frequency information. An order of execution of multiple join operations is then optimized based on the estimated cardinalities of the sub-tables.
Abstract:
A computer-implemented method, system, and/or computer program product optimizes an order of execution of column join operations. A first partitioning of the first data column splits the first data column into first subsets of rows. A second partitioning of the second data column splits the second data column into a second subsets of rows. Cardinalities of sub-tables derived by a respective joining of the subsets of rows of the first and second data columns are estimated, based on the first and second value frequency information. An order of execution of multiple join operations is then optimized based on the estimated cardinalities of the sub-tables.
Abstract:
Disclosed are systems, methods, and machine readable storage media that cause a storage computer and a client computer to perform a method of providing access to one or more resources on the storage computer for the client computer. The storage computer is operable for initiation of a network connection between the client computer and the storage computer. Initiation of the network connection between the client computer and the storage computer by the storage computer is enabled, and initiation of the network connection between the client computer and the storage computer by the client computer is disabled. The client computer and the storage computer are operable for maintaining the network connection between the client computer and the storage computer.
Abstract:
Disclosed are systems, methods, and machine readable storage media that cause a storage computer and a client computer to perform a method of providing access to one or more resources on the storage computer for the client computer. The storage computer is operable for initiation of a network connection between the client computer and the storage computer. Initiation of the network connection between the client computer and the storage computer by the storage computer is enabled, and initiation of the network connection between the client computer and the storage computer by the client computer is disabled. The client computer and the storage computer are operable for maintaining the network connection between the client computer and the storage computer.
Abstract:
Disclosed are systems, methods, and machine readable storage media that cause a storage computer and a client computer to perform a method of providing access to one or more resources on the storage computer for the client computer. The storage computer is operable for initiation of a network connection between the client computer and the storage computer. Initiation of the network connection between the client computer and the storage computer by the storage computer is enabled, and initiation of the network connection between the client computer and the storage computer by the client computer is disabled. The client computer and the storage computer are operable for maintaining the network connection between the client computer and the storage computer.
Abstract:
Disclosed are systems, methods, and machine readable storage media that cause a storage computer and a client computer to perform a method of providing access to one or more resources on the storage computer for the client computer. The storage computer is operable for initiation of a network connection between the client computer and the storage computer. Initiation of the network connection between the client computer and the storage computer by the storage computer is enabled, and initiation of the network connection between the client computer and the storage computer by the client computer is disabled. The client computer and the storage computer are operable for maintaining the network connection between the client computer and the storage computer.