XML I10-003 Exam - Topic 5 Question 42 Discussion

Actual exam question for XML's I10-003 exam

Question #: 42
Topic #: 5

[All I10-003 Questions]

Consider the execution of [XQuery] as referenced in a separate window.

Assume that the following index is used when executing this [XQuery] on a certain XMLDB.

[Index Usage Standards] (assumed)

Use only the most efficient index when an index for both $A/@type and $B/@type is created.

If only one index is created, use that index.

Do not use an index if none is created.

Assume the following circumstances regarding the statistical values related to the execution of this [XQuery].

[Statistical Value] (assumed)

When creating an index for $A/@type, the response time when updating $A/@type data is one millisecond longeron average.

When creating an index for $B/@type. the response time when updating $B/@type data is one millisecond longeron average.

When creating an index for either $A/@type or$B/@type, or when creating an index for both, the response time of [XQuery] execution is at least two milliseconds shorter on average.

Of all of the values of $A/@type, the rate of inclusion of identical values is 1% on average. Of all of the values of $B/@type, the rate of inclusion of identical values is 2% on average. The ratio of $A/@type data update, $B/@type data update, and [XQuery] execution is 1:1:1 on average.

When the number of data items for both $A/@type and $B/@type are extremely large and almost identical, which is the most effective method for improving overall execution efficiency? Assume that this XMLDB has no other automated optimization functions than those described above. Assume that no other queries are executed.

ADo not create an index

BCreate an index for $A/@type

CCreate an index for $B/@type

DCreate an index for both $A/@type and $B/@type

Show Suggested Answer

Suggested Answer: A

by Marg at Jun 03, 2024, 05:20 PM

Limited Time Offer

25%

Off

Get Premium I10-003 Questions as Interactive Web-Based Practice Test or PDF

Contribute your Thoughts:

Submit Cancel

Dell

6 months ago

Not sure if creating both indexes is really worth it.

upvoted 0 times

...

Fredric

6 months ago

Definitely create an index for $A/@type, it’s more efficient.

upvoted 0 times

...

Sharee

6 months ago

Surprised that the identical value rates are so low!

upvoted 0 times

...

Tesha

7 months ago

I think just one index is enough, not both.

upvoted 0 times

...

Rozella

7 months ago

Creating an index for both $A/@type and $B/@type is the way to go!

upvoted 0 times

...

Madalyn

7 months ago

I'm a bit confused about the impact of identical values on the decision. Does the 1% and 2% inclusion rate really affect which index to create?

upvoted 0 times

...

Mable

7 months ago

I practiced a similar question, and I feel like not creating an index at all could be a valid option if the data update rates are equal.

upvoted 0 times

...

Lovetta

7 months ago

I think creating an index for both $A/@type and $B/@type might be the best choice since it reduces the execution time by at least two milliseconds.

upvoted 0 times

...

Denna

7 months ago

I remember that if both indexes are created, we should use the most efficient one, but I'm not sure which option that would be here.

upvoted 0 times

...

Alaine

7 months ago

I think the most important factor here is the relative frequency of updates to $A/@type and $B/@type data. If one is significantly more frequent, that might tip the scales.

upvoted 0 times

...

India

7 months ago

Based on the information given, it seems like creating an index for both $A/@type and $B/@type would be the most effective approach to improve overall execution efficiency.

upvoted 0 times

...

Tyra

7 months ago

I'm a bit confused by the wording of the question. I'll need to re-read it a few times to make sure I'm understanding the requirements correctly.

upvoted 0 times

...

Carisa

8 months ago

Okay, let me think this through step-by-step. The key seems to be understanding the impact of the indexes on the different types of updates and the overall query execution.

upvoted 0 times

...

Verona

8 months ago

Hmm, this is a tricky one. I'll need to carefully consider the index usage standards and the statistical values provided.

upvoted 0 times

...

Luther

8 months ago

I'm a bit confused by the wording of this question. Can the variables be used in the three transformations, or are they completely independent? I want to make sure I fully understand the requirements before answering.

upvoted 0 times

...

Ernie

8 months ago

I remember that if behavior increases, reinforcing replacement behaviors is critical. Does that relate to option D?

upvoted 0 times

...

Veronika

8 months ago

Alright, this seems straightforward enough. I'll just need to make sure I have the right compute cluster set up and then use the provided code to set up the environment. Shouldn't be too much of a challenge.

upvoted 0 times

...

Dorinda

8 months ago

I'm a bit unsure here… wasn't there something about consensus algorithms like PBFT that don't rely on PoW?

upvoted 0 times

...

Andra

1 year ago

Option D all the way! Why wouldn't you want to have both indexes? It's like having a backup plan for your backup plan. And hey, at least it's not as bad as the time I tried to index my sock drawer, right?

upvoted 0 times

Matt

11 months ago

Haha, indexing a sock drawer would be quite a challenge!

upvoted 0 times

...

Nguyet

11 months ago

I agree, having both indexes can definitely improve efficiency.

upvoted 0 times

...

Matt

1 year ago

Exactly! It's better to be safe than sorry.

upvoted 0 times

...

Hector

1 year ago

Option D all the way! Why wouldn't you want to have both indexes?

upvoted 0 times

...

Desmond

1 year ago

Hold up, did they really say the data for $A/@type and $B/@type is 'extremely large and almost identical'? That's a pretty strange assumption. I'm going with option D, just to be safe.

upvoted 0 times

Willard

1 year ago

Yeah, I think it's better to go with creating an index for both $A/@type and $B/@type just to improve overall efficiency.

upvoted 0 times

...

Devon

1 year ago

I agree, that assumption does seem odd. But I think option D is the safest choice.

upvoted 0 times

...

Melynda

1 year ago

Hmm, I'm not sure. The low rate of identical values for both $A/@type and $B/@type data makes me think that creating an index for just one of them might be a better choice. Decisions, decisions...

upvoted 0 times

...

Carin

1 year ago

That's a good point, but considering the overall execution efficiency, creating an index for both might still be the best option.

upvoted 0 times

...

Douglass

1 year ago

Well, this is a tricky one. Given the statistics provided, it seems like creating an index for both $A/@type and $B/@type would be the most efficient option. The response time improvement for the [XQuery] execution is the key factor here.

upvoted 0 times