Exam 11: Database Performance Tuning and Query Optimization

To generate database object statistics manually,following syntax should be used in Oracle: .

In-memory database systems are optimized to store small portions of the database in disk storage alone.

The table space is used for transaction-recovery purposes.

In RAID level 5,:

The analyzes the SQL query and finds the most efficient way to access the data.

If there is no index,the DBMS will perform a scan.

The SQL cache stores the end-user written SQL.

DBMS performance tuning includes global tasks such as managing the DBMS processes in primary memory and managing the structures in physical storage.

A(n)request is a low-level read or write data access operation to or from computer devices.

A (n)____ is an index based on a specific SQL function or expression.

The DBMS the SQL query and chooses the most efficient access/execution plan.

In standard SQL,the optimizer hint ALL_ROWS is generally used for mode processes.

is another name for table space.

A conditional expression is normally expressed within the or HAVING clauses of a SQL statement.

Describe query optimization and the modes that an optimizer can operate in.

In standard SQL,the optimizer hint FIRST_ROWS is generally used for mode processes.

A system will perform best when its hardware and software resources are .

How should storage volumes be allocated for indexes,system,and high-usage tables?

One of the main functions of a database system is to provide timely answers to end users.

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