Which monitoring indicators do I need to pay attention to during daily operations?
You need to pay attention to the instance running status, CPU usage, memory usage, disk space usage, network, number of database threads, QPS/TPS, and other related indicators.
You can configure alarm prompts according to application scenarios and take measures to handle any reported alarms. For details about how to configure alarms, see Monitoring and Alarms-Configuring Custom Alarm Rules.
If an alarm related to CPU usage or memory usage is reported, you can scale up the CPU and memory respectively by changing the instance specification. For details, see Instance Management-Specification Scaling.
If an alarm related to disk space usage is reported, you can scale up the disk space through disk space scaling. For details, see Instance Management-Storage Space Scaling.
How can I calculate the memory usage of a MySQL instance?
On the Instance Management page, select an instance to see related monitoring indicators.
Calculating the memory usage of a MySQL instance:
Memory usage = (Total memory - (available memory + buffer memory for files + cache memory))/total memory.
How do I set an alarm rule for the primary/standby replication delay?
Currently, RDS for MySQL does not support setting alarms for the primary/standby replication delay. If you want to confirm whether there is a delay in the current primary/standby instances, you can submit an order.