Tag: databases

Questions Related to databases

Which utility should be used for maintaining referential integrity between two tables
technology databases

  1. LOAD

  2. CHECK

  3. REORG

  4. RUNSTATS

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Correct Option: B

Which utility should be used for maintaining consistency for list of tablespaces
technology databases

  1. QUIESCE

  2. CHECK

  3. REORG

  4. RUNSTATS

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Correct Option: A

Which utility should be used to restore DB2 tablespaces and indexes to a specific instance
technology databases

  1. QUIESCE

  2. RECOVER

  3. REORG

  4. RUNSTATS

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Correct Option: B

Which utility should be used to obtain the access paths details?
technology databases

  1. QUIESCE

  2. EXPLAIN

  3. REORG

  4. RUNSTATS

Show answer
Correct Option: B
Explanation:

To answer this question, the user needs to have a basic understanding of database management systems and utilities used to manage databases.

QUIESCE is a utility used to temporarily halt the activity on the database, allowing for maintenance operations to take place. It is not used to obtain access path details.

EXPLAIN is a utility used to display the access path details for a particular SQL statement. This option is correct.

REORG is a utility used to reorganize the physical storage of a database table, and is not used to obtain access path details.

RUNSTATS is a utility used to collect statistical information about the data contained in a database table, and is not used to obtain access path details.

Therefore, the correct answer is:

The Answer is: B. EXPLAIN

To create a trigger you need the following option
technology databases

  1. Triggering Table

  2. Triggering Event

  3. Triggered Action

  4. All the above

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Correct Option: D

Triggers can not be used for

technology databases

  1. Validate input data

  2. Automatically generate values for newly inserted rows

  3. support alerts

  4. To Implement Referential Integrity

Show answer
Correct Option: D

AI Explanation

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

Option A) Validate input data - This option is incorrect. Triggers can be used to validate input data. Triggers can be set to execute before or after an insert, update, or delete operation and can be used to enforce data validation rules.

Option B) Automatically generate values for newly inserted rows - This option is incorrect. Triggers can be used to automatically generate values for newly inserted rows. For example, a trigger can be set to insert a default value into a specific column when a new row is inserted.

Option C) Support alerts - This option is incorrect. Triggers can be used to support alerts. For example, a trigger can be set to send an alert or notification when a specific condition is met.

Option D) To implement Referential Integrity - This option is correct. Triggers cannot be used to implement referential integrity. Referential integrity is typically enforced through foreign key constraints and not through triggers.

The correct answer is D) To implement Referential Integrity. This option is correct because triggers are not used to implement referential integrity. Referential integrity is enforced through foreign key constraints.

Choose the correct options on acquiring locks
technology databases

  1. If transaction A holds X lock on row R, If transaction B requests for S lock, then B would go into wait state until A releases the lock

  2. If transaction A holds S lock on row R, If transaction B requests for S lock, then B would be granted the lock

  3. If transaction A holds X lock on row R, If transaction B requests for X lock,then B would be granted the lock.

  4. If transaction A holds S lock on row R, If transaction B requests for X lock, then B would be granted the lock

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Correct Option: A,B

Choose the correct options on LOCKSIZE
technology databases

  1. Database

  2. Tablespace

  3. Table

  4. View

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Correct Option: B,C

Referential constraint is
technology databases

  1. Designates the values that columns of a table can contain

  2. The limiting of a set of foreign key values to a set of primary key values

  3. The limiting of a set of Primary key values to a set of foreign key values

  4. None of the above

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Correct Option: B

When acquiring Tablespace lock more data is restricted than page level Lock (True or False)
technology databases

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

A tablespace lock is the most restrictive type of lock in DB2. It prevents any other process from accessing any data in the tablespace. A page lock only prevents other processes from accessing the specific page that is locked.

Therefore, the statement "When acquiring Tablespace lock more data is restricted than page level Lock" is True.

A tablespace lock restricts access to all of the data in a tablespace, while a page lock only restricts access to a single page. This means that a tablespace lock is more restrictive than a page lock.

For example, if a tablespace contains 100 pages and a process acquires a tablespace lock on the tablespace, then no other process can access any of the data in the tablespace, even if the data is not on the page that is locked. However, if a process acquires a page lock on a single page in the tablespace, then other processes can still access the data on the other 99 pages in the tablespace.

In general, tablespace locks should only be used when it is absolutely necessary to prevent other processes from accessing any data in the tablespace. Page locks should be used whenever possible, as they provide a more granular level of locking and allow other processes to access more data.