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109 lines
3.0 KiB
Markdown
### Understanding the Basics
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With a 32 GB RAM server, your primary goal is to maximize the use of available memory to reduce disk I/O, which is the slowest part of database operations. The main setting to focus on is the size of the InnoDB buffer pool.
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Open your MySQL configuration file, which is typically `my.cnf`. Common locations include:
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* `/etc/mysql/my.cnf`
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* `/etc/my.cnf`
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* `/etc/mysql/mysql.conf.d/mysqld.cnf`
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Always make a backup of the original file before making any changes.
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```bash
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sudo cp /etc/mysql/my.cnf /etc/mysql/my.cnf.bak
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sudo nano /etc/mysql/my.cnf
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```
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-----
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### Key Settings for 32 GB RAM
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Add or adjust the following lines under the `[mysqld]` section of the configuration file. These settings are optimized for a **dedicated database server**. If your server hosts other resource-intensive applications, you should slightly decrease these values.
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#### 1\. InnoDB Buffer Pool Size
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The **InnoDB buffer pool** is the most critical setting. It's the cache for your data and indexes. A larger buffer pool means MySQL can keep more of your active dataset in fast RAM, drastically improving performance.
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For a 32 GB server, allocating about 70-80% of the total RAM is ideal. This leaves enough memory for the operating system and other processes.
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```ini
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innodb_buffer_pool_size = 24G
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```
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#### 2\. Query Cache
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The query cache is known to cause performance issues on busy servers, and it has been removed in MySQL 8.0. **It's best to disable it** on modern systems.
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```ini
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query_cache_type = 0
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query_cache_size = 0
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```
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#### 3\. Thread Cache Size
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The **thread cache** stores threads for reuse, which avoids the overhead of creating new threads for each connection. A higher value is beneficial for a server with many concurrent connections.
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```ini
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thread_cache_size = 256
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```
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#### 4\. Max Connections
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Set `max_connections` to a value that reflects the expected number of concurrent users or application connections. A value of 500 is a good starting point for a busy server.
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```ini
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max_connections = 500
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```
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-----
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### Complete `my.cnf` Example
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Here is a summary of the recommended settings. Copy and paste these into your `my.cnf` file under the `[mysqld]` section.
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```ini
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[mysqld]
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# Basic settings
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user = mysql
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pid-file = /var/run/mysqld/mysqld.pid
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socket = /var/run/mysqld/mysqld.sock
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port = 3306
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# Memory & InnoDB settings
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innodb_buffer_pool_size = 24G
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innodb_log_file_size = 256M
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innodb_flush_log_at_trx_commit = 2
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innodb_file_per_table = 1
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innodb_flush_method = O_DIRECT
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# Concurrency & Performance
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max_connections = 500
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thread_cache_size = 256
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# Query Cache (recommended to disable)
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query_cache_type = 0
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query_cache_size = 0
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# MyISAM (if applicable)
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key_buffer_size = 128M
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# Logging
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log_error = /var/log/mysql/error.log
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```
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-----
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### Applying the Changes
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After saving your changes, you must restart the MySQL service to apply the new settings.
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```bash
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sudo systemctl restart mysql
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```
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You can then check the status of the service to ensure it started successfully.
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```bash
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sudo systemctl status mysql
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``` |