Query Optimizer Assignment Help
The Query Optimizer is a part of relational database management system that attempts to determine the most efficient way to execute a query. It generate one or more query plan is selected and used to run the query. The Query Optimizer is responsible for generating the input for the execution engine. It takes a parsed representation of a SQL query as input and is responsible for generating n efficient execution plan for the given SQL query from the space of possible execution plans.
Steps for Query Optimization are:
- Translate SQL Query to Relational Algebra Query.
- Then create a query tree.
- Create left-deep alternative trees.
- Create query plans for our trees
- Estimate costs of plans
- Pick best one
Fig: How Query Optimization work
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