Practice Test 2 | Google Cloud Certified Professional Data Engineer | Dumps | Mock Test
Your team was working on a development BigTable instance for some time experimenting on it to stream event data coming from hundreds of sensors sending events frequently. After development is done, the team lead considered instead of deleting the instance and losing all events collected since building the pipeline, it would be a better idea to use the instance in production with the required changes to ensure high availability and best performance.
Which of the following approaches is best to satisfy the team lead’s requirements?
A. Export the data from BigTable development instance to Google Storage, launch a new BigTable production instance with SSD storage type, then load the data from Google Storage to the new BigTable instance.
B. Export the data from BigTable development instance to Google Storage, launch a new BigTable production instance with HDD storage type, then load the data from Google Storage to the new BigTable instance.
C. Change BigTable instance type from development to production, scale up number of nodes and ensure the storage type is HDD.
D. Change BigTable instance type from development to production, scale up number of nodes and ensure the storage type is SSD.
Answer: D.
If you no longer want to use a development instance for development and testing, you can upgrade it to a production instance at any time. Upgrading a development instance is permanent.
A cluster must have enough nodes to support its current workload and the amount of data it stores. Otherwise, the cluster might not be able to handle incoming requests, and latency could go up.
SSD is significantly faster and has a more predictable performance than HDD. In a Cloud Bigtable cluster, SSD storage delivers 6 ms latencies for both reads and writes for 99% of all requests. By contrast, HDD storage delivers 200 ms read latencies and 50 ms write latencies on the same benchmark.
Answer A & B are incorrect: No need to export data from an existing instance to a new one. You can upgrade existing instances by keeping data.
Answer C is incorrect: HDD is not recommended for optimal performance. SSD should be used.
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Notes: Here Option A and Option D are possible solutions. Now we need to select one between these 2.
As we know for BigTable we cannot upgrade HDD to SSD and the question is silent about drive type whether SSD or HDD.
Hence our first approach would be to check if Drive is SSD or HDD. if yes then Option D is a correct answer and if not then Option A will be a possible answer.
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Source(s):
BigTable Instances, Clusters & Nodes: https://cloud.google.com/bigtable/docs/instances-clusters-nodes BigTable – SSD vs. HDD: https://cloud.google.com/bigtable/docs/choosing-ssd-hdd
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