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Query Optimization is a function of many relational database management systems. Query optimization is the overall process of choosing the most efficient means of executing a SQL statement. The database optimizes each SQL statement based on statistics collected about the accessed data. SQL is a nonprocedural language, so the optimizer is free to merge, reorganize, and process in any order. The query optimizer attempts to determine the most efficient way to execute a given query by considering the possible query plans.
Factors considered by the optimizer include:
- Number of rows returned
- Size of the initial data sets
- System resources, which includes I/O, CPU, and memory
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