| 摘要 |
A system and associated method for improving efficiency and data security of a relational database management system (RDBMS). Access path security is configured for respective users of the RDBMS, having either access-by-key or access-by-scan value. The access-by-key access path security requires an end user to specify a search key in a query as configured for the end user to service the query. Only few users with administrative capacity are configured with the access-by-scan access path security, which permits servicing queries in conventional ways without screening queries by scanning database. The RDBMS calculates the most efficient access path for the query received from the end user, and retrieves data requested by the query only when the calculated access path is permitted by the access path security for the end user.
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