What are the log management techniques for learning MySQL?

What are the log management techniques for learning MySQL?

In database management, logging is a very important function. As a commonly used database management system, MySQL provides several different types of logs for recording database operations, errors and tracking information. This article will introduce MySQL log management techniques and provide corresponding code examples.

1. Error Log(Error Log)
   The error log is a log that records errors and exception information encountered by MySQL Server. It is very important for troubleshooting and solving database problems. By modifying the MySQL configuration file my.cnf, you can specify the path and name of the error log file.

Example: Add the following settings in the my.cnf file:

[mysqld]
log_error = /var/log/mysql/error.log

2. Query Log (Query Log)
   The query log records every query received by the MySQL server. query log. It is very helpful for analyzing query performance and tuning. By modifying the MySQL configuration file my.cnf, you can specify the path and name of the query log file, and choose whether to log all queries or only slow queries.

Example: Add the following settings in the my.cnf file:

[mysqld]
general_log = 1
general_log_file = /var/log/mysql/query.log

3. Binary Log (Binary Log)
   The binary log records all changes to the database log. It is very important for data recovery and master-slave replication. By modifying the MySQL configuration file my.cnf, you can specify the path and name of the binary log file and choose whether to enable binary logging.

Example: Add the following settings in the my.cnf file:

[mysqld]
log-bin = /var/log/mysql/mysql-bin.log

4. Slow Query Log(Slow Query Log)
   The slow query log records that the execution time exceeds Log of query statements with a certain threshold. It is very helpful for analyzing and optimizing poorly performing queries. By modifying the MySQL configuration file my.cnf, you can specify the path and name of the slow query log file and set the query threshold time.

Example: Add the following settings in the my.cnf file:

[mysqld]
slow_query_log = 1
slow_query_log_file = /var/log/mysql/slowquery.log
long_query_time = 2

5. Compression Log (Compression Log)
   The compression log function can compress the MySQL log file. Compress to save disk space and speed up reading and writing. The log compression function can be enabled by modifying the MySQL configuration file my.cnf.

Example: Add the following settings in the my.cnf file:

[mysqld]
binlog_format = ROW
binlog_row_image = minimal
log-bin = /var/log/mysql/mysql-bin.log

The above are some common log management techniques for MySQL. By rationally using these logs, we can help us better manage and optimize the MySQL database.

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