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NEW QUESTION 32
In relation to Amazon SQS, how can you ensure that messages are delivered in order?
- A. Increase the size of your queue
- B. Give each message a unique id.
- C. Send them with a timestamp
- D. AWS cannot guarantee that you will receive messages in the exact order you sent them
Answer: D
Explanation:
Amazon SQS makes a best effort to preserve order in messages, but due to the distributed nature of the queue, AWS cannot guarantee that you will receive messages in the exact order you sent them. You typically place sequencing information or timestamps in your messages so that you can reorder them upon receipt.
https://aws.amazon.com/items/1343?externalID=1343
NEW QUESTION 33
Which of the following solutions is not supported by DynamoDB:
- A. Global secondary index
- B. Hash Primary Key
- C. Local secondary index
- D. Hash secondary index
Answer: D
Explanation:
In DynamoDB, a secondary index is a data structure that contains a subset of attributes from a table, along with an alternate key to support Query operations. DynamoDB supports the following two types of secondary indexes:
Local secondary index is an index that has the same hash key as the table, but a different range key. A local secondary index is "local" in the sense that every partition of a local secondary index is scoped to a table partition that has the same hash key.
Global secondary index is an index with a hash and range key that can be different from those on the table. A global secondary index is considered "global" because queries on the index can span all of the data in a table, across all partitions.
http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DataModel.html
NEW QUESTION 34
A nightly batch job loads 1 million new records into a DynamoDB table. The records are only needed for one hour, and the table needs to be empty by the next night's batch job.
Which is the MOST efficient and cost-effective method to provide an empty table?
- A. Use DeleteItem using a ConditionExpression.
- B. Use BatchWriteItem to empty all of the rows.
- C. Create and then delete the table after the task has completed.
- D. With a recursive function that scans and calls out DeleteItem.
Answer: A
NEW QUESTION 35
Which statements about DynamoDB are true? Choose 2 answers
- A. DynamoDB uses optimistic concurrency control
- B. DynamoDB uses conditional writes for consistency
- C. DynamoDB restricts item access during writes
- D. DynamoDB uses a pessimistic locking model
- E. DynamoDB restricts item access during reads
Answer: A,B
NEW QUESTION 36
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