Implementation of Complex Selections Conjunction:oa1A2Λ.·9n() A8 (conjunctive selection using one index). Select a combination of 0;and algorithms A1 through A7 that results in the least cost for oei(r). Test other conditions on tuple after fetching it into memory buffer. A9(conjunctive selection using multiple-key index). Use appropriate composite(multiple-key)index if available. A10(conjunctive selection by intersection of identifiers). Requires indices with record pointers. Use corresponding index for each condition,and take intersection of all the obtained sets of record pointers. Then fetch records from file If some conditions do not have appropriate indices,apply test in memory. Database System Concepts-5th Edition,Aug 27,2005. 13.13 ©Silberschat乜，Korth and SudarshanDatabase System Concepts - 5 13.13 ©Silberschatz, Korth and Sudarshan th Edition, Aug 27, 2005. Implementation of Complex Selections Conjunction: 1 2. . . n (r) A8 (conjunctive selection using one index). Select a combination of i and algorithms A1 through A7 that results in the least cost for i (r). Test other conditions on tuple after fetching it into memory buffer. A9 (conjunctive selection using multiple-key index). Use appropriate composite (multiple-key) index if available. A10 (conjunctive selection by intersection of identifiers). Requires indices with record pointers. Use corresponding index for each condition, and take intersection of all the obtained sets of record pointers. Then fetch records from file If some conditions do not have appropriate indices, apply test in memory