The Global Services Layer in Snowflake is responsible for several tasks including authentication, infrastructure management, metadata management, query parsing and optimization, and access control​1​. However, the documentation does not specifically mention that it gathers and maintains statistics on all columns in all micro-partitions.
Snowflake's Global Services Layer manages metadata, which includes statistics about the data stored in micro-partitions. However, it does not gather and maintain statistics on all columns in all micro-partitions.
Snowflake automatically collects metadata and statistics to optimize query performance. It does this continuously in the background, analyzing data as it's loaded and as queries are executed. While it gathers essential statistics, it's unnecessary and inefficient to maintain detailed statistics for every single column in every micro-partition.
Snowflake focuses on collecting statistics that are most useful for query optimization, such as:
Value ranges within columns.
The number of distinct values (approximate).
Information about NULL values.
The answer is A. True.
Let's explain why this is true:
Snowflake's Global Services Layer:
- Automatically gathers statistics on ALL columns
- Maintains statistics for ALL micro-partitions
- This is done without DBA intervention
- Used for query optimization
Key points about statistics collection:
- Continuous and automatic process
- Covers every column in every micro-partition
- No manual statistics gathering needed
- Used by query optimizer for efficient execution plans
For the SnowPro Core exam, remember:
- Statistics collection is automatic
- No DBA maintenance required
- Covers all columns and micro-partitions
- This is a key differentiator from traditional databases
- Helps with query optimization and performance
- Part of Snowflake's cloud-native architecture benefits
This automatic statistics gathering is one of Snowflake's key features that helps with query optimization and maintenance-free operations.
â—Ź Micro-partition level metadata â—‹ Row count
â—Ź Micro-partition column-level metadata â—‹ MIN and MAX values â—‹ Number of DISTINCT values â—‹ Number of NULL values
B.False,Snowflake's Global Services Layer gathers and maintains statistics on columns in micro-partitions, but it does not gather and maintain statistics on all columns in all micro-partitions
Snowflake's Global Services Layer does not gather and maintain statistics on all columns in all micro-partitions. Instead, it dynamically gathers statistics as needed for query optimization, utilizing metadata and sampling techniques to optimize query performance.
No definition of Global Services Layer, it should be cloud services layer
Snowflake stores metadata about all rows stored in a micro-partition, not columns
https://www.snowflake.com/wp-content/uploads/2014/10/A-Detailed-View-Inside-Snowflake.pdf
It clearly says the service layer saves the metadata about the stored data in snowflake. Page 7, right column.
"Snowflake stores metadata about all rows stored in a micro-partition, including:
- The range of values for each of the columns in the micro-partition.
- The number of distinct values.
- Additional properties used for both optimization and efficient query processing."
Seems to me that this is done by the Cloud Services layer, and this "Global Services layer" looks like another term for it:
https://docs.snowflake.com/en/user-guide/tables-clustering-micropartitions#what-are-micro-partitions
B . FALSE
Cloud Services
If Snowflake’s computing layer is the brawn of our solution, our cloud services layer is the brain. Snowflake’s cloud services manage client sessions, metadata, transactions, query planning, security/governance and many other services. It’s also a highly scalable tier thanks to the near-limitless computing resources in the cloud. Snowflake supports thousands of customer accounts and hundreds of millions of queries each and every day.
There is no Global Services Layer in snowflake. https://www.bing.com/search?q=snowflake+global+services+layer&qs=NM&pq=what+is+global+services+layer+in+snowflake&sc=6-42&cvid=9660BE0F9FA3415AB5F2EF9404F1C104&FORM=QBRE&sp=1&ghc=2&lq=0
metadata comes from the micro partition data only right. metadata is count(*), min and max values in each micro partition, distinct values. min and max of each micro partition is what it decides pruning right?
https://www.snowflake.com/product/architecture/
Snowflake is a single, integrated platform delivered as-a-service. It features storage, compute, and global services layers that are physically separated but logically integrated. Data workloads scale independently from one another, making it an ideal platform for data warehousing, data lakes, data engineering, data science, modern data sharing, and developing data applications.
Snowflake is a single, integrated platform delivered as-a-service. It features storage, compute, and GLOBAL SERVICES LAYERS
https://www.snowflake.com/product/architecture/
A voting comment increases the vote count for the chosen answer by one.
Upvoting a comment with a selected answer will also increase the vote count towards that answer by one.
So if you see a comment that you already agree with, you can upvote it instead of posting a new comment.
alfredofmt
Highly Voted 2Â years agoRajivnb
1Â year, 9Â months agolobr
Most Recent 2Â months agokentucky13caa
8Â months agohotflake
11Â months, 1Â week agoMallikharjuna452
12Â months agoPrashantGupta1616
1Â year, 1Â month agoStevec80
1Â year, 2Â months agoJasMozai
1Â year, 2Â months agolol632
1Â year, 7Â months agooscarglob
1Â year, 7Â months agodpexam2023
1Â year, 9Â months agoMarge23
1Â year, 10Â months agoMultiCloudIronMan
1Â year, 12Â months agoLeinho
2Â years agoRajivnb
1Â year, 9Â months agotochengiri
2Â years, 1Â month agoMayuri917233
2Â years, 2Â months agoEmiB
2Â years, 4Â months ago