Snowflake Exam ADA-C01 Topic 4 Question 12 Discussion

Actual exam question for Snowflake's ADA-C01 exam

Question #: 12
Topic #: 4

An Administrator is evaluating a complex query using the EXPLAIN command. The Globalstats operation indicates 500 partitionsAssigned.

The Administrator then runs the query to completion and opens the Query Profile. They notice that the partitions scanned value is 429.

Why might the actual partitions scanned be lower than the estimate from the EXPLAIN output?

AThe EXPLAIN results always include a 10-15% safety factor in order to provide conservative estimates.

BThe GlobalStats partition assignment includes the micro-partitions that will be assigned for preservation of the query results.

CRuntime optimizations such as join pruning can reduce the number of partitions and bytes scanned during query execution.

DIn-flight data compression will result in fewer micro-partitions being scanned at the virtual warehouse layer than were identified at the storage layer.

Show Suggested Answer

Suggested Answer: B

When future grants are defined on the same object type for a database and a schema in the same database, the schema-level grants take precedence over the database level grants, and the database level grants are ignored4. This behavior applies to privileges on future objects granted to one role or different roles4. Future grants allow defining an initial set of privileges to grant on new (i.e. future) objects of a certain type in a database or a schema3. As soon as the new objects are created inside the database or schema, the predefined set of privileges are assigned to the object automatically without any manual intervention3.

by Kristeen at Apr 26, 2024, 11:22 PM

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Corazon

1 months ago

Wait, so the EXPLAIN command is basically the database version of a crystal ball? Gotta love the unpredictability of technology.

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Gayla

11 days ago

C) Runtime optimizations such as join pruning can reduce the number of partitions and bytes scanned during query execution.

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Mike

12 days ago

A) The EXPLAIN results always include a 10-15% safety factor in order to provide conservative estimates.

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Andra

1 months ago

Micro-partitions, macro-problems. It's like a game of partition Tetris up in here.

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Arlette

2 months ago

Haha, a 10-15% safety factor? That's like the IT version of 'the dog ate my homework'.

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Laurena

1 days ago

C) Runtime optimizations such as join pruning can reduce the number of partitions and bytes scanned during query execution.

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Doretha

13 days ago

A) The EXPLAIN results always include a 10-15% safety factor in order to provide conservative estimates.

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Rikki

2 months ago

Ah, the classic partitions scanned mystery. Looks like runtime optimizations can make a real difference. I bet the data compression also plays a role.

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Lawrence

1 months ago

User 3: In-flight data compression might also play a role in scanning fewer micro-partitions at the virtual warehouse layer.

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Lawrence

1 months ago

User 2: Yeah, runtime optimizations can definitely reduce the number of partitions and bytes scanned during query execution.

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Jovita

1 months ago

User 1: I think the actual partitions scanned can be lower due to runtime optimizations like join pruning.

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Mattie

2 months ago

The EXPLAIN command is great, but it seems like it's not always accurate. I wonder if there's a way to make the estimates more reliable.

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Lorrie

1 months ago

D) In-flight data compression will result in fewer micro-partitions being scanned at the virtual warehouse layer than were identified at the storage layer.

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Jacqueline

1 months ago

C) Runtime optimizations such as join pruning can reduce the number of partitions and bytes scanned during query execution.

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Paz

2 months ago

I'm not sure, but I think D could also be a valid explanation. In-flight data compression could result in fewer partitions being scanned.

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Staci

2 months ago

I agree with Sina. Join pruning can definitely help in reducing the partitions scanned during query execution.

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Sina

2 months ago

I think the answer is C. Runtime optimizations can reduce the number of partitions scanned.

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