MS SQL Server - 75 - Query Optimizer Hints MCQ

75 – Query Optimizer Hints MCQ

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1. What are optimizer hints in SQL Server primarily used for?

Generating random query plans

Automatically optimizing queries

Configuring query caching

Forcing the query optimizer to use a specific execution plan

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2. Why might you want to use optimizer hints in SQL Server?

To automatically generate query plans

To improve query performance by providing guidance to the optimizer

To disable query optimization

To restrict query execution to a specific time frame

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3. What is the main purpose of using optimizer hints in SQL Server?

To generate random query plans

To eliminate query execution plans

To force the query optimizer to follow a specific plan

To disable query caching

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4. In SQL Server, which statement is true regarding optimizer hints?

They are always recommended for improving performance.

They are used for configuring server settings.

They are only applicable to SELECT statements.

They should be avoided as they can negatively impact query performance.

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5. What is the primary advantage of using optimizer hints in SQL Server?

They guarantee improved query performance.

They simplify query optimization.

They allow you to specify the execution plan you want.

They provide more flexibility in query writing.

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6. In SQL Server, what is a query hint?

A query result set

A query execution plan

A subquery

A suggestion to the query optimizer for plan generation

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7. Which of the following is NOT a reason for using optimizer hints in SQL Server?

To force a specific index to be used in a query

To resolve query performance issues

To provide guidance to the query optimizer

To automatically generate query plans

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8. In SQL Server, what is a query plan hint?

A query result set

A suggestion to the query optimizer for plan generation

A subquery

A query execution plan

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9. Which of the following is a valid type of optimizer hint in SQL Server?

RANDOMIZE_PLAN

INDEX_SCAN

PLAN_FREEZE

EXECUTE_IMMEDIATE

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10. What is the purpose of the OPTION (RECOMPILE) hint in SQL Server?

It generates random query plans.

It disables query optimization.

It forces the query optimizer to use a specific index.

It compiles the query plan at runtime.

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11. In SQL Server, what is the purpose of the OPTION (OPTIMIZE FOR) hint?

To force a specific index to be used

To disable query caching

To specify a specific plan to use

To optimize query performance based on parameter values

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12. What is the main goal of using the OPTION (HASH JOIN) hint in SQL Server?

To force the query optimizer to use hash joins

To suggest the use of nested loop joins

To specify the exact join algorithm to use

To disable query optimization

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13. Which optimizer hint is used to specify a specific plan guide for a query?

OPTION (MERGE JOIN)

OPTION (USE PLAN)

OPTION (FORCESCAN)

OPTION (RECOMPILE)

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14. What is the purpose of the OPTION (MAXDOP) hint in SQL Server?

To generate random query plans.

To disable query optimization.

To force the query optimizer to use a specific execution plan.

To limit the maximum degree of parallelism for a query.

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15. In SQL Server, what is the purpose of the OPTION (FAST) hint?

To indicate that the query should execute quickly.

To disable query optimization.

To suggest using a specific index.

To force the query optimizer to use a specific plan.

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16. Which optimizer hint is used to specify a specific plan for a query using a query plan guide?

OPTION (MERGE JOIN)

OPTION (USE PLAN)

OPTION (OPTIMIZE FOR UNKNOWN)

OPTION (HASH JOIN)

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17. What is the primary purpose of the OPTION (MERGE JOIN) hint in SQL Server?

To generate random query plans.

To disable query optimization.

To force the query optimizer to use a specific execution plan.

To indicate that a merge join should be used.

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18. In SQL Server, what is the primary goal of the OPTION (FORCESCAN) hint?

To suggest using a specific index.

To disable query optimization.

To force a scan operation instead of seek operation.

To specify the exact join algorithm to use.

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19. Which optimizer hint in SQL Server is used to specify that a table should be read with a table scan?

OPTION (MERGE JOIN)

OPTION (FORCESCAN)

OPTION (HASH JOIN)

OPTION (LOOP JOIN)

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20. What is the primary purpose of the OPTION (LOOP JOIN) hint in SQL Server?

To suggest using a specific index.

To indicate that a loop join should be used.

To force the query optimizer to use a specific execution plan.

To generate random query plans.

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21. In SQL Server, what is the primary function of the OPTION (USE PLAN) hint?

To suggest using a specific index.

To specify the exact plan to use for query optimization.

To force the query optimizer to use a specific execution plan.

To disable query optimization.

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22. Which optimizer hint is used to suggest the use of a specific index in SQL Server?

OPTION (INDEX)

OPTION (RECOMPILE)

OPTION (FORCE INDEX)

OPTION (USE INDEX)

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23. In SQL Server, what is the primary purpose of the OPTION (FORCE ORDER) hint?

To indicate that the order of tables in the query should be followed.

To disable query optimization.

To generate random query plans.

To force the query optimizer to use a specific execution plan.

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24. Which optimizer hint is used to specify the number of rows to be processed before returning results in SQL Server?

OPTION (FORCE ORDER)

OPTION (RECOMPILE)

OPTION (ROWCOUNT)

OPTION (TOP)

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25. What is the primary function of the OPTION (OPTIMIZE FOR UNKNOWN) hint in SQL Server?

To force the query optimizer to use a specific execution plan.

To suggest using a specific index.

To generate random query plans.

To indicate that parameter sniffing should be disabled.

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MS SQL Server – 75 – Query Optimizer Hints MCQ