ClickHouse Monitoring Metrics

Monitoring metrics are key data indicators used to measure system performance and stability. ClickHouse is an open-source relational database management system, and its monitoring metrics are also a very important part.

Query Delay (Query Delay)

Query delay refers to the time from the request to returning the result. High query delay may lead to poor user experience and may affect the performance and reliability of business.

What is Query Delay?

Query delay refers to the time from clicking the "Submit" button to the database returning the result, usually expressed in seconds.

How to Calculate Query Delay?

querying_delay = query_time + network_delay

How to Reduce Query Delay?

Optimizing SQL statements, reducing request volume, and using caching can help reduce query delay.

Throughput (Throughput)

Throughput refers to the amount of data processed or the number of executions per unit of time. High throughput indicates that the system can effectively handle a large number of data requests, improving business reliability and speed.

What is Throughput?

Throughput refers to the amount of data processed or the number of executions per unit of time, which can be expressed in units such as bytes/s, row/s, etc.

How to Calculate Throughput?

Throughput = (read + write) / time_unit

How to Improve Throughput?

Increasing the number of CPU cores, improving disk performance, and increasing memory and cache size can help improve throughput.

Node Health Status (Node Health)

Node health status refers to whether the various nodes of the database are available and stable. High availability and low failure rates are key components to maintaining system stability.

What is Node Health Status?

Node health status indicates whether the various nodes of the database are available and in a stable state, usually represented as "UP" or "DOWN".

How to Check Node Health Status?

The node health status in monitoring metrics can help understand the current status of the system, and logs and alert mechanisms can also be used to quickly identify fault points.

How to Ensure Node Health Status?

Maintaining the security and stability of nodes, and using high availability, multi-write, and other strategies can help ensure node health status.