Introduction to log settings and viewing methods in MySQL
This article mainly introduces MySQL log settings and viewing methods. Friends in need can refer to it
MySQL has the following types of logs:
Error log: -log- err
Query log: -log
Slow query log: -log-slow-queries
Update log: -log-update
Binary log: -log-bin
By default, all logs are created in the mysqld data directory. By flushing the log, you can force mysqld to close and reopen the log file (or in some cases switch to a new log). When you execute a FLUSH LOGS statement or execute mysqladmin flush-logs or mysqladmin refresh, a log refresh occurs
1. Error log
Use --log - error[=file_name] option to specify the location where mysqld saves the error log file. If no file_name value is given, mysqld uses the error log name host_name.err and writes the log file in the data directory. If you execute FLUSH LOGS, the error log is renamed with an -old suffix and mysqld creates a new empty log file. (If the --log-error option is not given, no renaming will occur).
If --log-error is not specified, or (on Windows) if you use the --console option, errors are written to stderr. Usually standard output is your terminal.
2. General Query Log If no file_name value is given, the default name is host_name.log.
The log file of the SQL statement in seconds. If the file_name value is not given, the default is not the host name, and the suffix is -slow.log. If a filename is given but not an absolute pathname, the file is written to the data directory.
3. Update log ;show variables like 'log_%';How to know the current logmysql> show master status;
mysql> show master logs;Use to view binary log files mysqlbinlogshell>mysqlbinlog mail-bin.000
001
or shell>mysqlbinlog mail-bin.000001 | tail
specified in
config file
The output location of the log.
Windows: The Windows configuration file is my.ini, which is usually in the
installation
directory of MySQL or under c:\Windows. Linux
: The Linux configuration file is my.cnf, usually under /etc.
Under linux: Sql code# 在[mysqld] 中输入
#log
log-error=/usr/local/mysql/log/error.log
log=/usr/local/mysql/log/mysql.log
long_query_time=2
log-slow-queries= /usr/local/mysql/log/slowquery.log
# 在[mysqld] 中输入 #log
log-error=/usr/local/mysql/log/error.log
log=/usr/local/mysql/log/mysql.log
long_query_time=2
log-slow-queries= /usr/local/mysql/log/slowquery.log
Under windows:Sql代码
# 在[mysqld] 中输入
#log
log-error="E:/PROGRA~1/EASYPH~1.0B1/mysql/logs/error.log"
log="E:/PROGRA~1/EASYPH~1.0B1/mysql/logs/mysql.log"
long_query_time=2
log-slow-queries= "E:/PROGRA~1/EASYPH~1.0B1/mysql/logs/slowquery.log"
# 在[mysqld] 中输入 #log
log-error="E:/PROGRA~1/EASYPH~1.0B1/mysql/logs/error.log"
log="E:/PROGRA~1/EASYPH~1.0B1/mysql/logs/mysql.log"
long_query_time=2
log-slow-queries= "E:/PROGRA~1/EASYPH~1.0B1/mysql/logs/slowquery.log"
Enable slow query
long_query_time =2 --是指执行超过多久的sql会被log下来，这里是2秒 log-slow-queries= /usr/local/mysql/log/slowquery.log --将查询返回较慢的语句进行记录 log-queries-not-using-indexes = nouseindex.log --就是字面意思，log下来没有使用 索引 的query log=mylog.log --对所有执行语句进行记录 windows下开启mysql日志： 在[mysql]下加入这些（基本上等于加在最后面）： log-error= #Enter a name for the query log file. Otherwise a default name will be used. #注:（写成txt文件editplus可以及时 重载 ,不过有时要放在C盘下editplus才可以及时重载） log= c:/ mysql_query .log.txt #Enter a name for the slow query log file. Otherwise a default name will be used. log-slow-queries= #Enter a name for the update log file. Otherwise a default name will be used. log-update= #Enter a name for the binary log. Otherwise a default name will be used. log-bin=
The above is the detailed content of Introduction to log settings and viewing methods in MySQL. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
MySQL: An Introduction to the World's Most Popular Database
Apr 12, 2025 am 12:18 AM
MySQL is an open source relational database management system, mainly used to store and retrieve data quickly and reliably. Its working principle includes client requests, query resolution, execution of queries and return results. Examples of usage include creating tables, inserting and querying data, and advanced features such as JOIN operations. Common errors involve SQL syntax, data types, and permissions, and optimization suggestions include the use of indexes, optimized queries, and partitioning of tables.
How to open phpmyadmin
Apr 10, 2025 pm 10:51 PM
You can open phpMyAdmin through the following steps: 1. Log in to the website control panel; 2. Find and click the phpMyAdmin icon; 3. Enter MySQL credentials; 4. Click "Login".
Why Use MySQL? Benefits and Advantages
Apr 12, 2025 am 12:17 AM
MySQL is chosen for its performance, reliability, ease of use, and community support. 1.MySQL provides efficient data storage and retrieval functions, supporting multiple data types and advanced query operations. 2. Adopt client-server architecture and multiple storage engines to support transaction and query optimization. 3. Easy to use, supports a variety of operating systems and programming languages. 4. Have strong community support and provide rich resources and solutions.
MySQL's Place: Databases and Programming
Apr 13, 2025 am 12:18 AM
MySQL's position in databases and programming is very important. It is an open source relational database management system that is widely used in various application scenarios. 1) MySQL provides efficient data storage, organization and retrieval functions, supporting Web, mobile and enterprise-level systems. 2) It uses a client-server architecture, supports multiple storage engines and index optimization. 3) Basic usages include creating tables and inserting data, and advanced usages involve multi-table JOINs and complex queries. 4) Frequently asked questions such as SQL syntax errors and performance issues can be debugged through the EXPLAIN command and slow query log. 5) Performance optimization methods include rational use of indexes, optimized query and use of caches. Best practices include using transactions and PreparedStatemen
How to connect to the database of apache
Apr 13, 2025 pm 01:03 PM
Apache connects to a database requires the following steps: Install the database driver. Configure the web.xml file to create a connection pool. Create a JDBC data source and specify the connection settings. Use the JDBC API to access the database from Java code, including getting connections, creating statements, binding parameters, executing queries or updates, and processing results.
How to start mysql by docker
Apr 15, 2025 pm 12:09 PM
The process of starting MySQL in Docker consists of the following steps: Pull the MySQL image to create and start the container, set the root user password, and map the port verification connection Create the database and the user grants all permissions to the database
MySQL's Role: Databases in Web Applications
Apr 17, 2025 am 12:23 AM
The main role of MySQL in web applications is to store and manage data. 1.MySQL efficiently processes user information, product catalogs, transaction records and other data. 2. Through SQL query, developers can extract information from the database to generate dynamic content. 3.MySQL works based on the client-server model to ensure acceptable query speed.
How to install mysql in centos7
Apr 14, 2025 pm 08:30 PM
The key to installing MySQL elegantly is to add the official MySQL repository. The specific steps are as follows: Download the MySQL official GPG key to prevent phishing attacks. Add MySQL repository file: rpm -Uvh https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm Update yum repository cache: yum update installation MySQL: yum install mysql-server startup MySQL service: systemctl start mysqld set up booting
