| 摘要 |
Methods and apparatus, including computer program products, for compression of tables based on occurrence of values. In general, a number representing an amount of occurrences of a frequently occurring value in a group of adjacent rows of a column is generated (428), a vector representing whether the frequently occurring value exists in a row of the column is generated (422), and the number and the vector are stored to enable searches of the data represented by the number and the vector. The vector may omit a portion representing the group of adjacent rows (424). The values maybe dictionary-based compression values representing business data such as business objects. The values of the column may be sorted in order to increase the compression (416,418). The compression may be performed in-memory, in parallel, to improve memory utilization, network bandwidth consumption, and processing performance. |
