Tag: databases

Questions Related to databases

Teradata Index wizard used for

technology databases

  1. compare performance of multiple workloads

  2. recommend secondary indexes for a table

  3. recommend primay indexes for a table

  4. compare primay and secondary indexes for a table

Show answer
Correct Option: B

Given below, What is the maximum level of data protection

technology databases

  1. RAID 1 and Fallback

  2. RAID 5 and Fallback

  3. RAID 5 and No Fallback

  4. RAID 1 and No Fallback

Show answer
Correct Option: A

AI Explanation

To answer this question, we need to understand the concept of RAID (Redundant Array of Independent Disks) and data protection levels associated with it.

RAID is a technology that combines multiple physical disk drives into a single logical unit to improve performance, reliability, and data protection. Different RAID levels provide different levels of data protection, depending on the redundancy and fault tolerance mechanisms they employ.

Now, let's go through each option to understand why it is correct or incorrect:

Option A) RAID 1 and Fallback - This option is correct because RAID 1, also known as mirroring, provides the highest level of data protection. In RAID 1, data is mirrored across multiple drives, meaning that each drive contains an exact copy of the data. This redundancy ensures that even if one drive fails, the data can still be accessed from the other drive. Fallback refers to the ability to switch to a backup or redundant system in case of failure, further enhancing data protection.

Option B) RAID 5 and Fallback - This option is incorrect because RAID 5 does not provide the maximum level of data protection. RAID 5 uses striping with parity, distributing data and parity across multiple drives. While it offers some fault tolerance by allowing the system to continue functioning even if one drive fails, it does not provide the same level of redundancy as RAID 1.

Option C) RAID 5 and No Fallback - This option is incorrect for the same reasons mentioned above. RAID 5 without fallback does not provide the maximum level of data protection.

Option D) RAID 1 and No Fallback - This option is incorrect because while RAID 1 offers a high level of data protection, not having fallback limits the ability to switch to a backup or redundant system in case of failure, reducing the overall level of data protection.

Therefore, the correct answer is A) RAID 1 and Fallback. This option provides the maximum level of data protection by combining the redundancy of RAID 1 with the ability to switch to a backup or redundant system in case of failure.

Which statement is true if using NUPIs to accomplish data distribution?
technology databases

  1. The increase of hash buckets has resulted in more hash collisions.

  2. Duplicate NUPI values will produce the same row hash.

  3. Uniform row distribution is accomplished using UPIs.

  4. The low-order 16 bits of the row hash are input to the hash map.

Show answer
Correct Option: B

What option can best describe Teradata's architecture
technology databases

  1. Shared nothing

  2. Shared memory

  3. Shared everything

  4. shared data

Show answer
Correct Option: A

Why to Choose a Non Unique primary index instead of a unique primary index

technology databases

  1. A Non Unique primary index may be more effective for query access and joins

  2. A NUPI query simplifies the optimization process in the PE

  3. A NUPI provides better data distribution

  4. A NUPI requires less disk space to store the data row

Show answer
Correct Option: A

When utilizing a unique secondary index, how many AMP(s) are most probably accessed

technology databases

  1. 1 AMP

  2. Multi - AMP

  3. 2 -AMP

  4. All-AMP

Show answer
Correct Option: C

Temporary space is
technology databases

  1. assigned at the table level

  2. permanent space currently not used

  3. spool space currently not used

  4. subtracted form sysadmin

Show answer
Correct Option: B

Which is the component limits queries based on set thresholds?
technology databases

  1. Teradata Manager

  2. TDQM

  3. BTEQ

  4. QueryMan

Show answer
Correct Option: B

Sybase char_length equialent of SQL is

technology databases

  1. length

  2. char_length

  3. char_len

  4. len

Show answer
Correct Option: D

AI Explanation

To answer this question, we need to understand the Sybase database and its equivalent functions.

The Sybase equivalent function for the SQL char_length is len.

Let's go through each option to understand why it is correct or incorrect:

Option A) length - This option is incorrect because length is not the Sybase equivalent function for char_length.

Option B) char_length - This option is incorrect because char_length is not the Sybase equivalent function for char_length.

Option C) char_len - This option is incorrect because char_len is not the Sybase equivalent function for char_length.

Option D) len - This option is correct because len is the Sybase equivalent function for char_length.

The correct answer is Option D. This option is correct because len is the Sybase equivalent function for char_length.

How to change <> null in sybase to SQL?

technology databases

  1. is not null

  2. is null

  3. != null

  4. <> null

Show answer
Correct Option: A