C192 / Query Processing

The data cache or ____ is a shared, reserved memory area that stores the most recently accessed data blocks in RAM.

If there is no index, the DBMS will perform ____.

One measure that determines the need for an index is the ____ of the column you want to index. ____ refers to the number of different values a column could possibly have.

____ is the central activity during the parsing phase in query processing.

For Optimizer Hints, ____ instructs the optimizer to minimize the overall execution time, that is, to minimize the time it takes to return all rows in the query result set. This hint is generally used for batch mode processes.

For Optimizer Hints, ____ instructs the optimizer to minimize the time it takes to process the first set of rows, that is, to minimize the time it takes to return only the first set of rows in the query result set. This hint is generally used for interactive mode processes.

The ____ must be set large enough to permit as many data requests to be serviced from cache as possible.

The ____ stores the most recently executed SQL statements (after the SQL statements have been parsed by the optimizer).

The ____ is used as a temporary storage area for ORDER BY or GROUP BY operations, as well as for in-dex-creation functions.

Most DBMSs operate in one of two optimization modes: cost-based or rule-based. Others automatically de-termine the ____ based on whether database statistics are available.