Tag: database

Questions Related to database

You run a SELECT statement, and multiple duplicates of values are retrieved. What keyword can you use to retrieve only the non duplicate data?

database

  1. DUBPLICATE

  2. INDIVIDUAL

  3. SEPARATE

  4. DISTINCT

  5. INDEX

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Correct Option: D

Which of the following elements are the valid components of ACID in a relational database transaction?

database

  1. Atomicity

  2. Consistency

  3. Isolation

  4. Durability

  5. All of the above

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Correct Option: E

In JDBC, what represents a single instance of a particular database session?

database

  1. a thread

  2. an opened connection

  3. a closed connection

  4. a pipe

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Correct Option: B

What statement do you use to remove a schema and its related objects from your relational database?
database

  1. DROP SCHEMA CASCADE

  2. DROP SCHEMA RESTRICT

  3. DROP SCHEMA ALL

  4. DROP SCHEMA CLEAR

  5. DROP SCHEMA OPTS

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Correct Option: A

In a properly designed DBMS, concurrency control is provided by which of the following components.
database

  1. Process Manager

  2. Cache Manager

  3. Transaction Manager

  4. Lock Manager

  5. C&D

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Correct Option: E

Which of the following are valid CREATE statements in the world of DDL?

database

  1. CREATE SCHEMA

  2. CREATE TABLE

  3. CREATE DOMAIN

  4. CREATE INDEX

  5. All of the above

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Correct Option: E

What statement do you use to remove a schema and ensure that the removal takes place only if the schema is empty?

database

  1. DROP SCHEMA RESTRICT

  2. DROP SCHEMA OPTS

  3. DROP SCHEMA CASCADE

  4. DROP SCHEMA CLEAR

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Correct Option: A

What is used by a properly designed DBMS to enable databases to be returned to the pre-transaction state should errors occur?
database

  1. two phase commit

  2. prefetch transaction

  3. one phase commit

  4. backup and restore

  5. All of the above

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Correct Option: A

Under JDBC, which of the following types of instances can be created by the Connection object?

database

  1. PreparedStatement

  2. CallableStatement

  3. Statement

  4. SQLStatement

  5. AB&C

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Correct Option: E

AI Explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) PreparedStatement - This option is correct. The Connection object in JDBC can create instances of PreparedStatement. PreparedStatement is used to execute parameterized SQL queries and provides better performance and security compared to Statement.

Option B) CallableStatement - This option is correct. The Connection object in JDBC can create instances of CallableStatement. CallableStatement is used to execute stored procedures in the database.

Option C) Statement - This option is correct. The Connection object in JDBC can create instances of Statement. Statement is used to execute simple SQL queries.

Option D) SQLStatement - This option is incorrect. SQLStatement is not a valid class or interface in JDBC.

Based on the explanations above, the correct answer is E) AB&C. The Connection object in JDBC can create instances of PreparedStatement, CallableStatement, and Statement.