International Business Machines Corporation

Lev M Tsentsiper

Alexander Gorelik

Leon Burda

Salil Datta

Sharad Santhanam

Dongmei Ren

According to one embodiment of the present invention, a system determines key relationships between database tables and includes a computer system including at least one processor. The system determines a sampling range for one or more matching columns between first and second database tables. The matching columns satisfy one or more matching criteria and the sampling range is based on quantities of distinct values within the matching columns. Data is sampled from the first and second database tables in accordance with the sampling ranges to determine a sample set. Keys between the first and second database tables are determined based on matching between columns within the sample set. Embodiments of the present invention further include a method and computer program product for determining key relationships between database tables in substantially the same manner described above.

Generating composite key relationships between database objects based on sampling

According to a present invention embodiment, a system determines a relationship between source and target database tables, and includes a computer system including at least one processor. Potential pivot keys of the target database table are determined, and maps are created for each potential pivot key between the database tables based on distinct values. Transformations for each map are generated that enable target data to be produced from source data. The transformations for each potential pivot key are analyzed and the potential pivot key with the transformations that generate the greatest amount of matching data is selected as the resulting pivot key. The database table columns corresponding to the resulting pivot key are determined to be associated by the relationship. Embodiments of the present invention further include a method and computer program product for determining a relationship between source and target database tables in substantially the same manner described above.

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Santa Clara, CA, United States of America

Lev M Tsentsiper