Notes12 - Distributed Databases CS 245 Database System...

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11/30/2011 1 CS 245 Notes 12 1 CS 245: Database System Principles Notes 12: Distributed Databases Hector Garcia-Molina CS 245 Notes 12 2 Distributed Databases data DBMS data DBMS data DBMS data DBMS Distributed Database System CS 245 Notes 12 3 Advantages of a DDBS • Modularity • Fault Tolerance • High Performance • Data Sharing • Low Cost Components CS 245 Notes 12 4 Issues • Data Distribution • Exploiting Parallelism • Concurrency and Recovery • Heterogeneity CS 245 Notes 12 5 Parallelism: Pipelining • Example: – T 1 SELECT * FROM A WHERE cond – T 2 JOIN T 1 and B A B (with index) select join CS 245 Notes 12 6 Parallelism: Concurrent Operations Example: SELECT * FROM A WHERE cond A where A.x < 10 select select A where 10 A.x < 20 select A where 20 A.x merge data location is important...
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11/30/2011 2 CS 245 Notes 12 7 Join Processing • Example: JOIN A, B over attribute X A 1 A 2 B 1 B 2 A.x < 10 A.x 10 B.x < 10 B.x 10 join strategy CS 245 Notes 12 8 Join Processing • Example:
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