Rule application - Overview

• Does customer belong to a clique? If yes, switch to it

• Does the customer clique satisfy all pre-query rules? (e.g., Session_Start, Stat_Only, Queries_Per_session)

• Do the columns and tables belong to a segment?

• Does the query satisfy all pre-query rules? (e.g., valid segments)

• Does query need re-phrasing or augmentation? (e.g., Stat_Only to detailed Select)

• Send Query to appropriate Database (or mediator)

• Does query result satisfy all post-query rules? (e.g. Min_Rows_Retrieved, Secure_Keyword_Clique)

• Apply any result transformation rules (e.g. random falsification of data, aggregation)

• Update log and internal statistics

Gio Wiederhold TIHI Oct96 *

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