WGU D426 V2 Exam 160 Questions with Verified
Answers
The relationship (within the relation) that describes how the value of one
attribute may be used to find the value of another attribute. - CORRECT ANSWER
Functional Dependency
An attribute that can be used to find the value of another attribute in the relation.
- CORRECT ANSWER Determinant
Value can be used to find the value of every other non-key attribute in the table.
Unique and minimal. - CORRECT ANSWER Candidate Key
Define & manage database structures - CORRECT ANSWER DDL
Adding, deleting, and modifying data - Manipulates data stored in a database. -
CORRECT ANSWER DML
Used to create user accounts, manage permissions and access. - CORRECT
ANSWER DCL
Includes CREATE, DROP, ALTER, TRUNCATE, RENAME - CORRECT ANSWER DDL
A view created and stored on the database. Underlying data is changed and also
updated in this view. Uses memory space. - CORRECT ANSWER Materialized View
,Not stored in memory. Only computed when used or accessed. - CORRECT
ANSWER Virtual View
The data about the data. Describes elements such as columns, names, and data
type. - CORRECT ANSWER Metadata
Ordered collection of elements in parentheses. - CORRECT ANSWER Tuple
% of table rows selected by a query - CORRECT ANSWER Hit Ration
Reads blocks directly, without accessing an index. - CORRECT ANSWER Table Scan
Reads index blocks sequentially in order to locate the needed table blocks. -
CORRECT ANSWER Index Scan
Database repeatedly splits the index in two until it finds a match. - CORRECT
ANSWER Binary Search
Database object that maps one or more tables to a single file. - CORRECT ANSWER
Tablespace
Specifies tables, columns, and keys. Implements database requirements in a
specific database system. Also called a schema. - CORRECT ANSWER Logical Design
, Specifies indexes, table structures, and partitions. Specifies how tables are
organized on storage media. - CORRECT ANSWER Physical Design
Components of a computer system and the relationships between components. -
CORRECT ANSWER Architecture
Interact directly with database users and administrators and send queries to the
query processor. Includes Connectors & APIs, Workbench, and utility programs. -
CORRECT ANSWER Tools
Interprets queries. Compiles queries into low-level instructions for the storage
engine. Creates a plan to modify the database or retrieve data, and returns query
results to the application. - CORRECT ANSWER Query Processor
Link between tools and query processor - CORRECT ANSWER Connection
Creates connections and manages communication between tools and query
parser. - CORRECT ANSWER Connection Manager
Translates the query processor instructions into low-level file system commands
that modify or retrieve data. - CORRECT ANSWER Storage Engine
Accesses data on storage media. Data stored on storage media and organized in
files. Contains 3 types of data: - User data (tables & indexes) - Log files (record of
any changes) - Data dictionary (aka: catalog directory of tables, columns, keys,
indexes in a relational database). One row for each database object. - CORRECT
ANSWER File System
Answers
The relationship (within the relation) that describes how the value of one
attribute may be used to find the value of another attribute. - CORRECT ANSWER
Functional Dependency
An attribute that can be used to find the value of another attribute in the relation.
- CORRECT ANSWER Determinant
Value can be used to find the value of every other non-key attribute in the table.
Unique and minimal. - CORRECT ANSWER Candidate Key
Define & manage database structures - CORRECT ANSWER DDL
Adding, deleting, and modifying data - Manipulates data stored in a database. -
CORRECT ANSWER DML
Used to create user accounts, manage permissions and access. - CORRECT
ANSWER DCL
Includes CREATE, DROP, ALTER, TRUNCATE, RENAME - CORRECT ANSWER DDL
A view created and stored on the database. Underlying data is changed and also
updated in this view. Uses memory space. - CORRECT ANSWER Materialized View
,Not stored in memory. Only computed when used or accessed. - CORRECT
ANSWER Virtual View
The data about the data. Describes elements such as columns, names, and data
type. - CORRECT ANSWER Metadata
Ordered collection of elements in parentheses. - CORRECT ANSWER Tuple
% of table rows selected by a query - CORRECT ANSWER Hit Ration
Reads blocks directly, without accessing an index. - CORRECT ANSWER Table Scan
Reads index blocks sequentially in order to locate the needed table blocks. -
CORRECT ANSWER Index Scan
Database repeatedly splits the index in two until it finds a match. - CORRECT
ANSWER Binary Search
Database object that maps one or more tables to a single file. - CORRECT ANSWER
Tablespace
Specifies tables, columns, and keys. Implements database requirements in a
specific database system. Also called a schema. - CORRECT ANSWER Logical Design
, Specifies indexes, table structures, and partitions. Specifies how tables are
organized on storage media. - CORRECT ANSWER Physical Design
Components of a computer system and the relationships between components. -
CORRECT ANSWER Architecture
Interact directly with database users and administrators and send queries to the
query processor. Includes Connectors & APIs, Workbench, and utility programs. -
CORRECT ANSWER Tools
Interprets queries. Compiles queries into low-level instructions for the storage
engine. Creates a plan to modify the database or retrieve data, and returns query
results to the application. - CORRECT ANSWER Query Processor
Link between tools and query processor - CORRECT ANSWER Connection
Creates connections and manages communication between tools and query
parser. - CORRECT ANSWER Connection Manager
Translates the query processor instructions into low-level file system commands
that modify or retrieve data. - CORRECT ANSWER Storage Engine
Accesses data on storage media. Data stored on storage media and organized in
files. Contains 3 types of data: - User data (tables & indexes) - Log files (record of
any changes) - Data dictionary (aka: catalog directory of tables, columns, keys,
indexes in a relational database). One row for each database object. - CORRECT
ANSWER File System
