Query Optimizer Assignment Help

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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
Query Optimizer Assignment Help

Fig: How Query Optimization work

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