Modern Database Management - Chapter 5
selecting structures.
A key decision in the physical design process is:
explain plan.
A command used in Oracle to display how the query optimizer intends to access indexes, use parallel servers and join tables to prepare query results is the:
extent.
A contiguous section of disk storage space is called a(n):
data type.
A detailed coding scheme recognized by system software for representing organizational data is called a(n):
extra space and update time.
A disadvantage of partitioning is:
all of the above.
A factor to consider when choosing a file organization is:
hash index table.
A file organization that uses hashing to map a key into a location in an index where there is a pointer to the actual data record matching the hash key is called a:
all of the above.
A method for handling missing data is to:
parallel query processing.
A method that speeds query processing by running a query at the same time against several partitions of a table using multiprocessors is called:
clustering.
A method to allow adjacent secondary memory space to contain rows from several tables is called:
all of the above.
A requirement to begin designing physical files and databases is:
all of the above.
A rule of thumb for choosing indexes is to:
pointer
A(n) ________ is a field of data used to locate a related field or record.
hashing algorithm
A(n) ________ is a routine that converts a primary key value into a relative record number.
file organization
A(n) ________ is a technique for physically arranging the records of a file on secondary storage devices.
a one-to-many relationship.
All of the following are common denormalization opportunities EXCEPT:
multivalued partitioning.
All of the following are horizontal partitioning methods in Oracle EXCEPT:
use a lot of storage space.
All of the following are objectives when selecting a data type EXCEPT:
boolean.
All of the following are valid datatypes in Oracle 11g EXCEPT:
efficiency.
An advantage of partitioning is:
join index.
An index on columns from two or more tables that come from the same domain of values is called a:
range control.
An integrity control supported by a DBMS is:
data replication.
Another form of denormalization where the same data are stored in multiple places in the database is called:
transaction volumes.
Database access frequencies are estimated from:
descriptions
Designing physical files requires ________ of where and when data are used in various ways.
horizontal partitioning.
Distributing the rows of data into separate files is called:
when different categories of a table's rows are processed separately.
Horizontal partitioning makes sense:
efficient data processing
In most cases the goal of ________ dominates the design process.
Physical
In which data model would a code table appear?
Hashed
In which type of file is multiple key retrieval not possible?
secondary key.
One field or combination of fields for which more than one record may have the same combination of values is called a(n):
checking to see if missing data will greatly impact results.
Sensitivity testing involves:
field.
The smallest unit of application data recognized by system software is a:
data integrity
The storage format for each attribute from the logical data model is chosen to maximize ________ and minimize storage space.
default value.
The value a field will assume unless the user enters an explicit value for an instance of that field is called a(n):
Improve data integrity
Which of the following is an objective of selecting a data type?
Hashed
Which type of file is easiest to update?
Sequential
Which type of file is most efficient with storage space?
operating system.
While Oracle has responsibility for managing data inside a tablespace, the tablespace as a whole is managed by the:
tablespace.
Within Oracle, the named set of storage elements in which physical files for database tables may be stored is called a(n):
Vertical
________ partitioning distributes the columns of a table into several separate physical records.