1. A method for accessing a set of data tables in a source database, comprising: providing a set of table categories for tables in the source database; providing a set of metrics, each metric comprising a respective characteristic metric for each table category; for each table of the set of the data tables: evaluating the set of metrics, analyzing the evaluated set of metrics, and categorizing the table into one of the set of table categories using the result of the analysis; outputting information indicative of the table category of each table of the set of tables; in response to the outputting of the information indicative of the table category of each table of the set of tables, receiving a request to select data tables of the set of data tables according to a part of the table categories for data processing; and selecting a subset of data tables of the set of data tables using the table categories for performing the data processing on the subset of data tables.