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Query Optimization in Oracle	Enable Javascript for extra tools ✍ React ★ Bookmark ☷ Print ✍ React
Executive Summary This paper describes Oracle's query optimizer, a key database component that enables Oracle's customers to achieve superior performance. Unmatched Technology Oracle's query optimizer technology is unmatched in the breadth of its functionality, and this paper provides a detailed discussion of all major areas of query optimization.	Category 1 What is a query optimizer? What does Oracle provide for query optimization? Transitive predicate generation Category 2 SQL Transformations Heuristic query transformations Common subexpression elimination Category 2 Simple view merging Complex view merging Subquery flattening

Query Optimization in Oracle

Executive Summary

This paper describes Oracle's query optimizer, a key database component that enables Oracle's customers to achieve superior performance.

Unmatched Technology

Oracle's query optimizer technology is unmatched in the breadth of its functionality, and this paper provides a detailed discussion of all major areas of query optimization.

Information block C, a long block spanning both columns

The image resides on the left. There is a 6pt margin to its right. The image sizes up to 288pt by 162pt. It does so, because the table cell in which it lives sports a class named "double".

Information block A, with a rather large title

Information block B

Information block C, a long block spanning both columns

The image resides on the right. There is a 6pt margin to its left. The image sizes up to approx. 288pt by 162pt. It does so, because the table cell in which it lives sports a class named "double".

Information block D

This information block holds a description, an image, and a link to more items. The image is smaller because the table cell in which it lives does not sport the class named "double". Instead, the table cell sports no class at all.

Information block E

This information block holds a description, a drop-down, and a link to more items.

Information block F, another long block spanning both columns

This is an information block that also spans 2 columns, but this time there is no image. Why anyone would want to create a block like this remains a question for us.