The difference between MariaDB monitoring summary, master node, and standby node data lies in their focus and purpose within a database cluster.
MariaDB Monitoring Summary:
This provides an overview of the entire MariaDB cluster's health, performance, and resource usage. It includes metrics like CPU utilization, memory consumption, query throughput, replication lag, and connection counts. The summary helps administrators quickly assess the cluster's status without diving into individual node details.
Example: A monitoring summary might show that the cluster's average query latency is 5ms, with 95% CPU usage on one node, indicating a potential bottleneck.
Master Node Data:
The master node is the primary writer in a MariaDB replication setup. It handles all write operations (INSERT, UPDATE, DELETE) and replicates changes to standby nodes. Monitoring the master node focuses on write performance, replication status, and transaction logs.
Example: If the master node's replication lag increases, it may indicate that standby nodes are struggling to keep up with write operations.
Standby Node Data:
Standby nodes (or replicas) are read-only copies of the master node. They receive replicated data from the master and serve read requests to distribute load. Monitoring standby nodes involves checking replication lag, read performance, and synchronization status.
Example: A standby node with high replication lag may need investigation, as it could delay failover if the master fails.
For monitoring these components in Tencent Cloud, you can use TencentDB for MariaDB's built-in monitoring tools, which provide detailed metrics for the master node, standby nodes, and cluster-wide performance. Additionally, Cloud Monitor can be integrated to set alerts and visualize trends.