- (Exam Topic 1)
You want to use a database of information about tissue samples to classify future tissue samples as either normal or mutated. You are evaluating an unsupervised anomaly detection method for classifying the tissue samples. Which two characteristic support this method? (Choose two.)

1. A. There are very few occurrences of mutations relative to normal samples.
2. B. There are roughly equal occurrences of both normal and mutated samples in the database.
3. C. You expect future mutations to have different features from the mutated samples in the database.
4. D. You expect future mutations to have similar features to the mutated samples in the database.
5. E. You already have labels for which samples are mutated and which are normal in the database.

Correct Answer: AD
Unsupervised anomaly detection techniques detect anomalies in an unlabeled test data set under the assumption that the majority of the instances in the data set are normal by looking for instances that seem to fit least to the remainder of the data set. https://en.wikipedia.org/wiki/Anomaly_detection

- (Exam Topic 6)
You need (o give new website users a globally unique identifier (GUID) using a service that takes in data points and returns a GUID This data is sourced from both internal and external systems via HTTP calls that you will make via microservices within your pipeline There will be tens of thousands of messages per second and that can be multithreaded, and you worry about the backpressure on the system How should you design your pipeline to minimize that backpressure?

1. A. Call out to the service via HTTP
2. B. Create the pipeline statically in the class definition
3. C. Create a new object in the startBundle method of DoFn
4. D. Batch the job into ten-second increments

Correct Answer: A

- (Exam Topic 5)
Which of the following is NOT a valid use case to select HDD (hard disk drives) as the storage for Google Cloud Bigtable?

1. A. You expect to store at least 10 TB of data.
2. B. You will mostly run batch workloads with scans and writes, rather than frequently executing random reads of a small number of rows.
3. C. You need to integrate with Google BigQuery.
4. D. You will not use the data to back a user-facing or latency-sensitive application.

Correct Answer: C
For example, if you plan to store extensive historical data for a large number of remote-sensing devices and then use the data to generate daily reports, the cost savings for HDD storage may justify the performance tradeoff. On the other hand, if you plan to use the data to display a real-time dashboard, it probably would not make sense to use HDD storage—reads would be much more frequent in this case, and reads are much slower with HDD storage.
Reference: https://cloud.google.com/bigtable/docs/choosing-ssd-hdd

- (Exam Topic 6)
You’ve migrated a Hadoop job from an on-prem cluster to dataproc and GCS. Your Spark job is a complicated analytical workload that consists of many shuffing operations and initial data are parquet files (on average 200-400 MB size each). You see some degradation in performance after the migration to Dataproc, so you’d like to optimize for it. You need to keep in mind that your organization is very cost-sensitive, so you’d like to continue using Dataproc on preemptibles (with 2 non-preemptible workers only) for this workload.
What should you do?

1. A. Increase the size of your parquet files to ensure them to be 1 GB minimum.
2. B. Switch to TFRecords formats (app
3. C. 200MB per file) instead of parquet files.
4. D. Switch from HDDs to SSDs, copy initial data from GCS to HDFS, run the Spark job and copy results back to GCS.
5. E. Switch from HDDs to SSDs, override the preemptible VMs configuration to increase the boot disk size.

Correct Answer: A

- (Exam Topic 3)
You create a new report for your large team in Google Data Studio 360. The report uses Google BigQuery as its data source. It is company policy to ensure employees can view only the data associated with their region, so you create and populate a table for each region. You need to enforce the regional access policy to the data.
Which two actions should you take? (Choose two.)

1. A. Ensure all the tables are included in global dataset.
2. B. Ensure each table is included in a dataset for a region.
3. C. Adjust the settings for each table to allow a related region-based security group view access.
4. D. Adjust the settings for each view to allow a related region-based security group view access.
5. E. Adjust the settings for each dataset to allow a related region-based security group view access.

Correct Answer: BD