SoFunction
Updated on 2025-03-03

MySQL configuration file parsing

MySQLThe configuration file is the core configuration file of the MySQL database server, used to control the running behavior and performance optimization of MySQL. This file contains multiple sections, each of which defines a specific set of configuration options.

1. Basic structure

  • [client]: This part of the configuration affects the behavior of all MySQL client programs, such as connection ports, character sets, etc.
  • [mysqld]: This is the main configuration segment of MySQL server. Most of the service-related settings are here, including data storage path, buffer pool size, number of threads, log settings, etc.
  • [mysql]:InfluencemysqlThe default behavior of command line clients.
  • [mysqld_safe]: Related to the mysqld_safe daemon, usually used to set log files and error handling.
  • [mysqldump]: Parameters used to configure the mysqldump backup tool.
  • [mysqladmin]: Configure parameters of mysqladmin management tool.
  • [replication]: Master-slave replication related settings, such as server-id, etc.
  • Custom segments: Custom segments can be added as needed, such as setting up independent configurations for specific MySQL instances.

2. Examples of key configuration items

Ports and sockets

[mysqld]
port = 3306
socket = /var/run/mysqld/

Character Settings

[mysqld]
character-set-server=utf8mb4
collation-server=utf8mb4_unicode_ci

Log configuration

[mysqld]
general_log = 1
general_log_file = /var/log/mysql/
slow_query_log = 1
slow_query_log_file = /var/log/mysql/
long_query_time = 2

InnoDB Settings

[mysqld]
innodb_buffer_pool_size = 1G
innodb_log_file_size = 256M
innodb_flush_log_at_trx_commit = 1

Memory management

[mysqld]
key_buffer_size = 64M
query_cache_size = 32M
query_cache_limit = 4M

Connection and thread

[mysqld]
max_connections = 500
thread_cache_size = 16

Temporary file directory

[mysqld]
tmpdir = /var/tmp

Security settings

[mysqld]
skip-name-resolve # Disable DNS resolution, improve security, but use IP authorization

3. Things to note

  • ReviseAfter that, it is usually necessary to restart the MySQL service to make the new settings take effect.
  • Configuration tuning should be based on actual workload and resource constraints, and over-optimization may backfire.
  • Before making major configuration changes, it is recommended to back up the originaland step by step test the impact of changes.
  • Use tools such asmysqltunerorpt-query-digestCan help analyze the current configuration and give optimization suggestions.

The above is justA small part of the configuration file examples, the actual configuration should be considered based on specific application scenarios, database size, access mode and other factors.

This is the end of this article about MySQL configuration file analysis. For more related MySQL configuration content, please search for my previous articles or continue browsing the related articles below. I hope everyone will support me in the future!