摘要:
Compressing system paths in a database is disclosed. The systems and methods of the invention define an efficient mechanism to specify a cell's location within the database where there are hierarchies of levels within a dimension. The compressed system paths allow random access of the data without decompressing the data. The format used lends itself well to indexing, and also to creating aggregations of the cell data.
摘要:
A system and method for analytically modeling data from different measure groups onto a single cube are disclosed. The single cube preferably includes a first measure associated with a first measure group with a first set of corresponding dimensions. The single cube preferably also includes a second measure associated with a second measure group with a second set of corresponding dimensions. The single cube preferably also includes each dimension in both the first and second set of dimensions. Each measure is preferably tied to each corresponding dimension according to data in an underlying relational data table. Each measure is preferably tied to each non-corresponding dimension according to an approximation.
摘要:
Creating and maintaining cell data records in a multidimensional database is disclosed using flexible dimension paths is disclosed. The systems and methods of the invention define an efficient mechanism to specify a cell's location within the multidimensional database where there are hierarchies of levels within a dimension. The flexible dimension path does not change when a member is moved from a first point to a second point on a dimension thereby avoiding the need to rebuild the OLAP database. The format used lends itself well to indexing, and also to creating aggregations of the cell data.
摘要:
Systems and methods for creating and maintaining virtual cubes are disclosed. A virtual cube is a logical representation of a subset of the dimensions and measures of at least one physical cube maintained by an OLAP server. Metadata defines the mappings from the dimensions and measures of the virtual cube to the dimensions and measures of the physical cube. Client applications can manipulate the virtual cube as if it were a physical cube.
摘要:
Creating and maintaining cell data records in a multidimensional database is disclosed. The systems and methods of the invention define an efficient mechanism to specify a cell's location within the multidimensional database where there are hierarchies of levels within a dimension. The format used lends itself well to indexing, and also to creating aggregations of the cell data.
摘要:
A method and system for compressing and decompressing read only data in records that have a fixed size. A plurality of records are divided into segments having a predetermined size. For each segment, the records are arranged in a table with rows for each record and a column for each field in each record. The width of each column of repeated data is compressed to zero bits and the repeated data is referenced in a header of the segment. The width of each column of integer data is compressed to the minimum number of bits required to represent the largest integer value in the fields of the column. Floating point data in each column is converted to integer data and the width of the each column with converted integer data is set to the minimum width necessary to represent the largest converted integer in each column. The conversion to integer data is calculated for floating point and real numbers with a minimum precision exponent that is stored in the header for the segment. Floating point data is cleaned when it is converted to integer data. The information in the header is employed to decompress the compressed records in the segment. The decompression lends itself well to fast random access of secondary storage devices.
摘要:
Maintaining data used for performing “what-if” analysis is disclosed. The systems and methods of the invention define an efficient mechanism allowing a user to specify how base values from a database are to be changed. The changes can be held in a local delta cache which is only exposed to a single user, leaving the base data unchanged. The changes can also be maintained in a write-back partition, which results in the changes being exposed to all clients of the database. Values in the write-back partition can be selectively rolled back if required.
摘要:
Maintaining data used for performing “what-if” analysis is disclosed. The systems and methods of the invention define an efficient mechanism allowing a user to specify how base values from a database are to be changed. The changes can be held in a local delta cache which is only exposed to a single user, leaving the base data unchanged. The changes can also be maintained in a write-back partition, which results in the changes being exposed to all clients of the database. Values in the write-back partition can be selectively rolled back if required.
摘要:
Maintaining data used for performing “what-if” analysis is disclosed. The systems and methods of the invention define an efficient mechanism allowing a user to specify how base values from a database are to be changed. The changes can be held in a local delta cache which is only exposed to a single user, leaving the base data unchanged. The changes can also be maintained in a write-back partition, which results in the changes being exposed to all clients of the database. Values in the write-back partition can be selectively rolled back if required.
摘要:
Maintaining data used for performing “what-if” analysis is disclosed. The systems and methods of the invention define an efficient mechanism allowing a user to specify how base values from a database are to be changed. The changes can be held in a local delta cache which is only exposed to a single user, leaving the base data unchanged. The changes can also be maintained in a write-back partition, which results in the changes being exposed to all clients of the database. Values in the write-back partition can be selectively rolled back if required.