Tag: databases

Questions Related to databases

Which of the following CANNOT be used to restrict specific values from being inserted into a column in a particular table?

technology databases

  1. Index

  2. Check constraint

  3. Referential constraint

  4. Default constraint

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Correct Option: D

AI Explanation

To answer this question, you need to understand the different ways to restrict specific values from being inserted into a column in a table.

Option A) Index - This option is incorrect. An index is used to improve the performance of queries by creating a data structure that allows for faster data retrieval. It does not restrict specific values from being inserted into a column.

Option B) Check constraint - This option is incorrect. A check constraint is used to specify a condition that must be met for a column or set of columns in a table. It restricts the values that can be inserted into the column based on the specified condition.

Option C) Referential constraint - This option is incorrect. A referential constraint is used to enforce referential integrity between two tables. It ensures that values inserted into a foreign key column in one table exist in the referenced primary key column of another table.

Option D) Default constraint - This option is correct. A default constraint is used to specify a default value for a column in a table. It does not restrict specific values from being inserted into the column.

The correct answer is D) Default constraint. This option cannot be used to restrict specific values from being inserted into a column in a particular table.

While attempting to connect to a database stored on an iSeries server from a Windows client, the following message was displayed: SQL1013N The database alias name or database name "TEST_DB" could not be found. Which of the following actions can be used to help determine why this message was displayed?
technology databases

  1. Execute the LIST REMOTE DATABASES command on the server; look for an entry for the TEST_DB database

  2. . Execute the LIST DCS DIRECTORY command on the server; look for an entry for the TEST_DB database

  3. Execute the LIST REMOTE DATABASES command on the client; look for an entry for the TEST_DB database

  4. Execute the LIST DCS DIRECTORY command on the client; look for an entry for the TEST_DB database

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Correct Option: D

When a client using the SERVER_ENCRYPT authentication type connects to a server using the SERVER authentication type, what happens?
technology databases

  1. An error will occur

  2. Data passed between the client and the server is encrypted.

  3. User IDs and passwords are passed to the server unencrypted

  4. User IDs and passwords are encrypted before they are passed to the server.

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Correct Option: A

The following SQL statements were executed in sequence: CREATE DISTINCT TYPE salary AS decimal(7,2) WITH COMPARISONS; CREATE TABLE staffsalary(empid INT, empsalary salary); INSERT INTO staffsalary VALUES (10, 50000), (20, 50000.00); UPDATE staffsalary SET empsalary = 60000 WHERE salary(50000) = empsalary; What is the current content of the staffsalary table?
technology databases

  1. ID | EMPSALARY 10 | 60000 20 | 50000.00

  2. ID | EMPSALARY 10 | 50000.00 20 | 50000.00

  3. ID | EMPSALARY 10 | 60000.00 20 | 60000.00

  4. .ID | EMPSALARY 10 | 60000.00 20 | 50000.00

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Correct Option: C

Which of the following provides a logical grouping of database objects?
technology databases

  1. View

  2. Table

  3. Schema

  4. Buffer pool

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Correct Option: C

Which of the following objects contains control structures that are considered the bound form of SQL statements
technology databases

  1. UDT

  2. Trigger

  3. Package

  4. Access plan

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Correct Option: C

Which of the following commands is used to retrieve database names from the local catalog for DRDA host databases on System i and System z?
technology databases

  1. LIST DB DIRECTORY

  2. LIST DCS DIRECTORY

  3. LIST NODE DIRECTORY

  4. LIST ACTIVE DATABASES

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Correct Option: B

Which of the following are types of routine objects?
technology databases

  1. Package and function

  2. Function and userexit

  3. Procedure and package

  4. Function and procedure

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Correct Option: D

What is the maximum size that can be specified when creating an XML column in a DB2 table?
technology databases

  1. No size is specified

  2. The buffer pool size

  3. The page size for the table space

  4. The extent size for the table space

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Correct Option: A

Given the following ALTER SEQUENCE statement: ALTER SEQUENCE myseq RESTART WITH 0 INCREMENT BY 1 NO MAXVALUE CACHE 5 ORDER Assuming that the sequence had reached a value of 100 prior to the RESTART, which of the following is true?
technology databases

  1. The next value will be 0 and the sequence will never use the values 101 to 105.

  2. The next value will be 101 to ensure uniqueness between existing and newly generated sequence values.

  3. Previously cached values are retained by DB2, and after the restart, will be used for values 101 to 105.

  4. The next value will be 0 and DB2 will not ensure uniqueness between existing and newly generated values.

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Correct Option: D