MySQL master-slave replication is a commonly used data backup and load balancing solution that can improve the availability and performance of the database system. In practical applications, it is very critical to evaluate and compare the performance of master-slave replication. This article will introduce the load balancing effect of MySQL master-slave replication, and illustrate it through actual measurement results and performance comparison.
1. The principle of MySQL master-slave replication
MySQL master-slave replication is achieved by copying data from one MySQL server (called the master server) to other MySQL servers (called the slave server). The master server records update operations in the binary log, and the slave server reads and performs these update operations from the binary log. In this way, master-slave replication can achieve automatic data synchronization and provide fault recovery and load balancing capabilities.
2. Experimental environment and methods
This experiment used one master server and three slave servers. The configuration of the master server and slave server is as follows:
Master server:
Slave server:
The experimental method is as follows:
3. Actual measurement results and performance comparison
First, we query on the slave server and record the query time. Suppose there is the following query code example:
import time import mysql.connector # 连接数据库 cnx = mysql.connector.connect(user='user', password='password', host='192.168.0.1', database='test') cursor = cnx.cursor() # 查询数据 starttime = time.time() query = "SELECT * FROM table" cursor.execute(query) endtime = time.time() # 输出查询结果和查询耗时 for row in cursor: print(row) print("Query Time:", endtime - starttime) # 关闭连接 cursor.close() cnx.close()
We run the above query code on three slave servers and record the query time. The results are as shown in the following table:
Query time (seconds) | |
---|---|
3.219 | |
3.342 | |
3.187 |
Query time (seconds) | |
---|---|
1.262 | |
1.297 | |
1.278 |
Through the above measured results and performance comparison, the following conclusions can be drawn:
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