Teradata Us, Inc.

Gary Allen Roberts

Guilian Wang

Donald Raymond Pederson

Olli Pekka Kostamaa

Steven Bart Cohen

John R Catozzi

Fred S Kaufmann

Mark Anthony Hodgens

A database system may implement compression management of tables in the database system. The compression management may include determination of a pattern of usage of various database tables in the database system. Based on this pattern of usage, the database tables may be selected as candidates for compression or decompression at the appropriate time. In one example, the pattern of usage may be based on the contents of a query log of the database system. The compression management may also include evaluation of various compression strategies to apply to a candidate database table. Each compression strategy may be evaluated to determine if application to a database table or a portion of the database table would be beneficial based on various conditions. The compression management may also include consideration of each available compression strategy to be applied solely or in combination with one another.

Selective data compression in a database system

A system and method for compressing and decompressing multiple types of character data. The system and method employ multiple encoding tables, each designed for encoding a subset of character data, such as numeric data, uppercase letters, lowercase letters, Latin, or UNICODE data, to perform compressions and decompression of character data, and. The compression solution also provides for the creation of new encoding tables on the fly, and accommodates the compression of lengthy character streams using multiple different general compression algorithms, automatically choosing a suitable general compression algorithm for specific input data.

System and method for data compression using multiple small encoding tables

A method, apparatus, and article of manufacture for accessing data in a computer system. Compression and decompression functions are associated with a column of the table, in order to perform compression of decimal, numeric or date data stored in the column when the data is inserted or updated in the table, and in order to perform decompression of the data stored in the column when the data is retrieved from the table. The compression function compresses and stores the data in a fixed-length compressed field in the column without a length value, and the fixed-length compressed field has a size that is determined by a range of values for the data stored in the fixed-length compressed field. The decompression function retrieves and decompresses the data from the fixed-length compressed field.

Numeric, decimal and date field compression

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Carlsbad, CA, United States of America

Gary Allen Roberts