Query Processing

Query Processing

1. Parsing

   • checks syntax, verifies relation

2. Optimization

   • determines the most efficient way to execute a given query by considering the possible query plans

3. Translation

   • Translate the query into its internal form
     • Further, translates into relational algebra.

4. Evaluation

   • In this, the query evaluation engine takes a query evaluation plan, executes that plan and returns the answer to the query.