What is sql performance tuning

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Reference no: EM133520712

Questions:

1. What is SQL performance tuning?

2. What is database performance tuning?

3. What is the focus of most performance-tuning activities, and why does that focus exist?

4. What are database statistics, and why are they important?

5. How are database statistics obtained?

6. What database statistics measurements are typical of tables, indexes, and resources?

7. How is the processing of SQL DDL statements (such as CREATE TABLE) different from the processing required by DML statements?

8. In simple terms, the DBMS processes a query in three phases. What are the phases, and what is accomplished in each phase?

9. If indexes are so important, why not index every column in every table? (Include a brief discussion of the role played by data sparsity.)

10. What is the difference between a rule-based optimizer and a cost-based optimizer?

 

Reference no: EM133520712

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