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>> CompTIA DS0-001 Valid Exam Braindumps <<
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NEW QUESTION # 112
A database administrator would like to address data inconsistencies, define conventions to be used across the organization, make data easier to analyze, and enforce the use of data standards. Which of the following solutions would best meet the administrator's need?
Answer: D
Explanation:
A data dictionary standardizes definitions and formats, helping enforce data consistency, conventions, and easier analysis across the organization.
NEW QUESTION # 113
Which of the following constraints is used to enforce referential integrity?
Answer: C
Explanation:
The constraint that is used to enforce referential integrity is foreign key. A foreign key is a column or a set of columns in a table that references the primary key of another table. A primary key is a column or a set of columns in a table that uniquely identifies each row in the table. Referential integrity is a rule that ensures that the values in the foreign key column match the values in the primary key column of the reference table. Referential integrity helps maintain the consistency and accuracy of the data across related tables. The other options are either different types of constraints or not related to referential integrity at all. For example, a surrogate key is a column that is artificially generated to serve as a primary key, such as an auto-increment number or a GUID (Globally Unique Identifier); a unique key is a column or a set of columns in a table that uniquely identifies each row in the table, but it can have null values unlike a primary key; there is no such constraint as TID.
NEW QUESTION # 114
Which of the following is an advantage of creating indexes?
Answer: A
Explanation:
The advantage of creating indexes is to provide quick and efficient access to data. An index is a data structure that stores the values of one or more columns of a table in a sorted order, along with pointers to the corresponding rows in the table. An index helps to speed up queries that search, filter, sort, or join data based on the indexed columns, as it reduces the number of disk accesses or scans required to locate the desired data. An index also helps to enforce uniqueness or referential integrity constraints on the indexed columns. The other options are either not true or not relevant for this purpose. For example, an index does not help with space allocation, as it consumes additional space in the database; an index does not reduce memory, as it may use memory for caching or buffering purposes; an index does not update the query plan, as it is an input or a factor for the query optimizer to generate the query plan. Reference: CompTIA DataSys+ Course Outline, Domain 1.0 Database Fundamentals, Objective 1.2 Given a scenario, execute database tasks using scripting and programming languages.
NEW QUESTION # 115
Gary is logging into a system and is providing his fingerprint to gain access. What step of the IAM process is he performing?
Answer: D
NEW QUESTION # 116
A new retail store employee needs to be able to authenticate to a database. Which of the following commands should a database administrator use for this task?
Answer: D
Explanation:
The command that the database administrator should use for this task is CREATE USER. The CREATE USER command is a SQL statement that creates a new user account in a database and assigns it a username and a password. The CREATE USER command also allows the database administrator to specify other options or attributes for the user account, such as default tablespace, quota, profile, role, etc. The CREATE USER command is the first step to enable a user to authenticate to a database. The other options are either invalid or not suitable for this task. For example, INSERT USER is not a valid SQL command; ALLOW USER is not a SQL command, but a keyword used in some database systems to grant permissions to users; ALTER USER is a SQL command that modifies an existing user account, but does not create a new one.
NEW QUESTION # 117
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