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Question 41 - DP-203 discussion

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You have a SQL pool in Azure Synapse.

A user reports that queries against the pool take longer than expected to complete. You determine that the issue relates to queried columnstore segments. You need to add monitoring to the underlying storage to help diagnose the issue. Which two metrics should you monitor? Each correct answer presents part of the solution. NOTE: Each correct selection is worth one point.

A.
Snapshot Storage Size
Answers
A.
Snapshot Storage Size
B.
Cache used percentage
Answers
B.
Cache used percentage
C.
DWU Limit
Answers
C.
DWU Limit
D.
Cache hit percentage
Answers
D.
Cache hit percentage
Suggested answer: B, D

Explanation:

D: Cache hit percentage: (cache hits / cache miss) * 100 where cache hits is the sum of all columnstore segments hits in the local SSD cache and cache miss is the columnstore segments misses in the local SSD cache summed across all nodes

B: (cache used / cache capacity) * 100 where cache used is the sum of all bytes in the local SSD cache across all nodes and cache capacity is the sum of the storage capacity of the local SSD cache across all nodes Incorrect Asnwers:

C: DWU limit: Service level objective of the data warehouse.

Reference: https://docs.microsoft.com/en-us/azure/synapse-analytics/sql-data-warehouse/sql-data-warehouse-concept-resource-utilization-query-activity

asked 02/10/2024
Winston Seedorf
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