Database Tuning and Query Optimisation, Chapter 13

The ____ is used as a temporary storage area for ORDER BY or GROUP BY operations, as well as for index-creation functions.
1. sort cache
2. SQL cache
3. data cache
4. optimizer mode
The DBMS processes queries in three phases; the first is ____.
1. parsing
2. analyzing
3. execution
4. fetching
Generally, what will provide the best database client performance in terms of CPU speed?
1. single processor
2. multiple processors
3. the slowest processor
4. the fastest processor
Working with data in the data cache is many times faster than working with data in the data files because ____.
1. there is no network access involved
2. the DBMS doesn't have to wait for the hard disk to retrieve the data
3. the DBMS can optimize queries against the cache
4. the data cache contains only a few records from each table
When creating a database, in order to optimize performance, put high-usage tables in their own ____.
1. data caches
2. data spaces
3. table caches
4. table spaces
Database statistics are stored in the system catalog in specially designated ____.
1. indexes
2. rows
3. table spaces
4. tables
To optimize queries, use simple columns or literals as operands in a conditional expression and avoid the use of conditional expressions with ____ whenever possible.
1. the WHERE clause
2. functions
3. the GROUP BY clause
4. indexes
The architecture of a DBMS is represented by the ____ and structures used to manage a database.
1. tables
2. queries
3. processes
4. logs
The ____ is a shared, reserved memory area that stores the most recently accessed data blocks in RAM.
1. table space
2. extends
3. data cache
4. SQL cache
Index ____ is a measure of how likely an index will be used in query processing.
1. statistics
2. connectivity
3. sparsity
4. selectivity
A(n) ____ is a logical grouping of several data files that store data with similar characteristics.
1. table space
2. extends
3. data cache
4. SQL cache
The majority of current database performance problems are related to ____.
1. not having enough memory on the database server
2. poorly written SQL code
3. improper use of table space
4. old statistics
To view the access plan for a given SQL statement, use the following command: SELECT * FROM TABLE(____).
1. DBMS_XPLAN.DISPLAY
2. PLAN_STAT
3. STATISTICS
4. ACCESS_PLAN
The ____ DBMS process schedules the concurrent execution of SQL requests.
1. scheduler
2. optimizer
3. listener
4. user
What is the goal of database performance?
1. to return accurate results
2. to prevent an inconsistent state
3. to execute queries as fast as possible
4. to replace other forms of data storage
In the SQL ____ phase of query processing, all I/O operations indicated in the access plan are executed.
1. parsing
2. execution
3. I/O
4. fetching
Database ____ refers to a set of activities and procedures designed to reduce the response time of the database system.
1. integrity checking
2. locking
3. query handling
4. performance tuning
A DBA determines the initial size of the data files that make up the database; however, as required, the data files can automatically expand in predefined increments known as ____.
1. tables
2. extends
3. segments
4. logs
____ facilitate searching, sorting, and using aggregate functions and even join operations.
1. Indexes
2. Plans
3. Queries
4. Fetches
To see the access plan used by the DBMS to execute your query, use the ____ statement.
1. EXPLAIN PLAN
2. STATISTICS
3. SHOW PLAN
4. DEBUG

Database Tuning and Query Optimisation, Chapter 13

Quiz