Chapter 14 An Overview of Query Optimization. Copyright © 2005 Pearson Addison-Wesley. All rights reserved. 11-2 Figure 14.1 Typical architecture for.

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Presentation transcript:

Chapter 14 An Overview of Query Optimization

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 14.1 Typical architecture for DBMS query processing.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 14.2 Query trees for relational expressions (14.3) through (14.6).

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 14.2 Query trees for relational expressions (14.3) through (14.6). (cont’d)

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 14.3 Query execution plans for relational expressions (14.3) through (14.6).

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 11.4 Query execution plans for relational expressions (14.3) through (14.6). (cont’d)

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 14.4 Transforming a query tree into a logical query execution plan.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 14.5 Logical plan and three equivalent query trees.

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 14.5 Logical plan and three equivalent query trees. (cont’d)

Copyright © 2005 Pearson Addison-Wesley. All rights reserved Figure 14.6 Heuristic search of the query execution plan space.

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