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Question 313 - DBS-C01 discussion

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A financial services company is using AWS Database Migration Service (AWS OMS) to migrate Its databases from on-premises to AWS. A database administrator is working on replicating a database to AWS from on-premises using full load and change data capture (CDC). During the CDC replication, the database administrator observed that the target latency was high and slowly increasing-

What could be the root causes for this high target latency? (Select TWO.)

A.
There was ongoing maintenance on the replication instance
Answers
A.
There was ongoing maintenance on the replication instance
B.
The source endpoint was changed by modifyng the task
Answers
B.
The source endpoint was changed by modifyng the task
C.
Loopback changes had affected the source and target instances-
Answers
C.
Loopback changes had affected the source and target instances-
D.
There was no primary key or index in the target database.
Answers
D.
There was no primary key or index in the target database.
E.
There were resource bottlenecks in the replication instance
Answers
E.
There were resource bottlenecks in the replication instance
Suggested answer: D, E

Explanation:

Target latency is the amount of time that AWS DMS takes to apply changes from the source database to the target database1. High target latency can indicate performance issues or replication errors in the AWS DMS task.

One possible cause of high target latency is the lack of a primary key or index in the target database. A primary key or index helps AWS DMS identify and apply changes to the corresponding rows in the target database.Without a primary key or index, AWS DMS has to scan the entire table to find the matching rows, which can increase the target latency and consume more CPU and memory resources2.

Another possible cause of high target latency is the resource bottlenecks in the replication instance. The replication instance is the compute resource that runs the AWS DMS task and connects to the source and target endpoints. If the replication instance is under-provisioned or overloaded, it can affect the replication performance and cause high target latency.Some factors that can contribute to resource bottlenecks are insufficient network bandwidth, low disk space, high CPU utilization, or large transaction sizes3.

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asked 16/09/2024
Vishal Gandhi
33 questions
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