Which of the following is not a potential cause of latency on an RDS read-only instance?
Latency on an RDS read-only instance can be caused by high loads on the instance itself, inadequate instance specifications, or excessive write operations on the master instance, as these factors directly impact replication delay and resource contention. However, a high load on the ECS instance connected to the RDS read-only instance would not inherently cause latency on the RDS instance, as the ECS and RDS operate independently in terms of processing.
A route table refers to the list of routing entries on a VRouter in an Alibaba Cloud VPC. You can create/delete any route tables in a VPC.
In Alibaba Cloud VPCs, only custom route tables can be created and deleted by users. The default route table associated with each VPC cannot be deleted, although custom routing entries within it can be modified. This limitation ensures the integrity of essential VPC networking components.
Which of the following database engines are compatible with RDS? (Choose three.)
Alibaba Cloud RDS supports several popular database engines, including MySQL, PostgreSQL, and SQL Server. PPAS (PostgreSQL Plus Advanced Server) is also supported but not Sybase, which is not available as an RDS option on Alibaba Cloud.
Alibaba Cloud CloudMonitor allows you to customize monitoring metrics and alert policies. Which of the following statements about customized monitoring are correct? (Choose two.)
CloudMonitor allows users to create custom monitoring metrics and report data, which can then be analyzed and used for alerts. Customized monitoring is flexible, with no set limits on the number of metrics, and users can report data from Alibaba Cloud servers or other devices.
When distributing loads to multiple ECS instances with an Alibaba Cloud Server Load Balancer (SLB), you can obtain the real IP addresses of users who initiate the requests through _____________. (Choose two.)
In Alibaba Cloud SLB, Layer-7 (HTTP/HTTPS) services require enabling the 'X-Forwarded-For' header to retrieve the real IP address of clients, while Layer-4 (TCP/UDP) services can obtain the real IP address directly without additional settings.
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