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NEW QUESTION 23
A corporation wishes to move a 1 TB Oracle database from its current location to an Amazon Aurora PostgreSQL DB cluster. The database specialist at the firm noticed that the Oracle database stores 100 GB of large binary objects (LOBs) across many tables. The Oracle database supports LOBs up to 500 MB in size and an average of 350 MB. AWS DMS was picked by the Database Specialist to transfer the data with the most replication instances.
How should the database specialist improve the transfer of the database to AWS DMS?
- A. Create two tasks: task1 with LOB tables using full LOB mode with a LOB chunk size of 500 MB and task2 without LOBs
- B. Create a single task using full LOB mode with a LOB chunk size of 500 MB to migrate the data and LOBs together
- C. Create two tasks: task1 with LOB tables using limited LOB mode with a maximum LOB size of 500 MB and task 2 without LOBs
- D. Create a single task using limited LOB mode with a maximum LOB size of 500 MB to migrate data and LOBs together
Answer: C
Explanation:
Explanation
https://docs.aws.amazon.com/dms/latest/userguide/CHAP_BestPractices.html#CHAP_BestPractices.LOBS,
“AWS DMS migrates LOB data in two phases: 1. AWS DMS creates a new row in the target table and populates the row with all data except the associated LOB value. 2.AWS DMS updates the row in the target table with the LOB data.” This means that we would need two tasks, one per phase and use limited LOB mode for best performance.
NEW QUESTION 24
A finance company migrated its 3 on-premises PostgreSQL database to an Amazon Aurora PostgreSQL DB cluster.
During a review after the migration, a database specialist discovers that the database is not encrypted at rest.
The database must be encrypted at rest as soon as possible to meet security requirements.
The database specialist must enable encryption for the DB cluster with minimal downtime.
Which solution will meet these requirements?
- A. Take a snapshot of the unencrypted DB cluster and restore it to a new DB cluster with encryption enabled. Update any database connection strings to reference the new DB cluster endpoint, and then delete the unencrypted DB cluster.
- B. Modify the unencrypted DB cluster using the AWS Management Console. Enable encryption and choose to apply the change immediately.
- C. Create a new DB cluster with encryption enabled and use the pg_dump and pg_restore utilities to load data to the new DB cluster. Update any database connection strings to reference the new DB cluster endpoint, and then delete the unencrypted DB cluster.
- D. Create an encrypted Aurora Replica of the unencrypted DB cluster. Promote the Aurora Replica as the new master.
Answer: A
Explanation:
https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/Overview.Encryption.html
NEW QUESTION 25
A financial services company is developing a shared data service that supports different applications from throughout the company. A Database Specialist designed a solution to leverage Amazon ElastiCache for Redis with cluster mode enabled to enhance performance and scalability. The cluster is configured to listen on port 6379.
Which combination of steps should the Database Specialist take to secure the cache data and protect it from unauthorized access? (Choose three.)
- A. Ensure the security group for the ElastiCache clients authorize inbound TCP port 6379 and port 22 traffic from the trusted ElastiCache cluster’s security group.
- B. Enable in-transit and at-rest encryption on the ElastiCache cluster.
- C. Ensure the security group for the ElastiCache cluster allows all inbound traffic from itself and inbound traffic on TCP port 6379 from trusted clients only.
- D. Ensure that Amazon CloudWatch metrics are configured in the ElastiCache cluster.
- E. Create an IAM policy to allow the application service roles to access all ElastiCache API actions.
- F. Ensure the cluster is created with the auth-token parameter and that the parameter is used in all subsequent commands.
Answer: B,C,F
Explanation:
https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/encryption.html
NEW QUESTION 26
A Database Specialist is troubleshooting an application connection failure on an Amazon Aurora DB cluster with multiple Aurora Replicas that had been running with no issues for the past 2 months. The connection failure lasted for 5 minutes and corrected itself after that. The Database Specialist reviewed the Amazon RDS events and determined a failover event occurred at that time. The failover process took around 15 seconds to complete.
What is the MOST likely cause of the 5-minute connection outage?
- A. After failover, the Aurora DB cluster needs time to warm up before accepting client connections
- B. After a database crash, Aurora needed to replay the redo log from the last database checkpoint
- C. There were no active Aurora Replicas in the Aurora DB cluster
- D. The client-side application is caching the DNS data and its TTL is set too high
Answer: D
Explanation:
Explanation
When your application tries to establish a connection after a failover, the new Aurora PostgreSQL writer will be a previous reader, which can be found using the Aurora read only endpoint before DNS updates have fully propagated. Setting the java DNS TTL to a low value helps cycle between reader nodes on subsequent connection attempts.
Amazon Aurora is designed to recover from a crash almost instantaneously and continue to serve your application data. Unlike other databases, after a crash Amazon Aurora does not need to replay the redo log from the last database checkpoint before making the database available for operations. Amazon Aurora performs crash recovery asynchronously on parallel threads, so your database is open and available immediately after a crash. Because the storage is organized in many small segments, each with its own redo log, the underlying storage can replay redo records on demand in parallel and asynchronously as part of a disk read after a crash. This approach reduces database restart times to less than 60 seconds in most cases
NEW QUESTION 27
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