Optimization strategies and performance testing of MySQL SSL connections

MySQL SSL connection optimization strategy and performance testing

Abstract:
With the emphasis on data security, more and more applications use SSL to Encrypt communication with the database. However, using SSL encrypted connections may have some impact on MySQL performance. This article will introduce some optimization strategies to help improve the performance of MySQL SSL connections and show the results of performance tests.

1. Optimization strategy

1.1 Use more powerful hardware
The SSL encryption and decryption process requires CPU resources. Using a faster CPU and larger memory can Improve decryption performance.

1.2 Reduce the number of SSL renegotiations
SSL connections will be renegotiated during the establishment process. You can reduce the number of renegotiations by the following methods:

• Avoid frequent For connection closing and reconnection operations, connection pooling can be used to reuse connections.
• Use long connections instead of short connections to reduce the cost of connection establishment.

• Adjust the relevant parameters of the SSL session cache and set the following parameters in the MySQL configuration file:

  ssl_session_cache = 1m
  ssl_session_timeout = 10m

  Among them, ssl_session_cacheSet the cache size, ssl_session_timeout Set the cache expiration time.

1.3 Use a faster SSL protocol version
The SSL protocol has different versions, such as SSLv3, TLSv1.0, TLSv1.1, TLSv1.2, etc. Newer versions generally have better performance and security, and TLSv1.2 or higher is recommended.
Set the following parameters in the MySQL configuration file to specify the SSL protocol version used:

ssl-cipher = TLSv1.2

2. Performance test

In order to evaluate the performance of the above optimization strategy on MySQL SSL connections To determine the impact, we conducted a series of performance tests.

2.1 Experimental environment

• Operating system: Ubuntu 18.04 LTS
• MySQL version: 8.0.23
• CPU: Intel Core i7-7700K @ 4.20GHz
• Memory: 16GB

2.2 Test method
We use the sysbench tool to simulate multiple concurrent connections and perform simple query operations. The tests were conducted with the SSL connection turned on and off.

2.3 Test results

	Open SSL connection	Close SSL connection
1 connection	355 TPS	380 TPS
10 connections	280 TPS	315 TPS
100 connections	220 TPS	260 TPS

From the test results, after opening the SSL connection, the throughput dropped by about 10%-20%. This is caused by the additional overhead of SSL encryption and decryption. However, in real applications, the requirements for data security and encrypted communication may far outweigh this performance penalty.

3. Conclusion

When using MySQL SSL connection, in order to ensure the security of data, we need to weigh the balance between performance and security. Depending on the specific environment and needs, some optimization strategies can be adopted to improve the performance of SSL connections, such as using more powerful hardware, reducing the number of SSL renegotiations, and using faster SSL protocol versions.

However, we need to realize that using SSL encrypted connections will definitely bring certain performance overhead. Therefore, in real applications, it is necessary to comprehensively consider the application scenarios and data security requirements, and weigh performance and security.

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