bitsCN.com
mariadb同样适用
首先检查mysql状态
linux-6yo1:~ # /etc/init.d/mysql statusChecking for service MySQL: unusedmysql.service - LSB: Start the MySQL database server Loaded: loaded (/etc/init.d/mysql) Active: inactive (dead) CGroup: name=systemd:/system/mysql.serviceJul 17 15:28:28 linux-6yo1.site systemd[1]: Stopped LSB: Start the MySQL dat....Jul 17 15:30:38 linux-6yo1.site systemd[1]: Stopped LSB: Start the MySQL dat....
发现Active: inactive (dead)
重启mysql.
linux-6yo1:~ # /etc/init.d/mysql restart
redirecting to systemctl restart mysql
再次查看mysql状态
linux-6yo1:~ # ps aux | grep mysql
root 5227 0.5 0.1 3204 1320 ? S 15:39 0:00 /bin/sh /usr/bin/mysqld_safe --mysqld=mysqld --user=mysql --pid-file=/var/run/mysql/mysqld.pid --socket=/var/run/mysql/mysql.sock --datadir=/var/lib/mysql
mysql 5575 2.2 4.6 472456 47808 ? Sl 15:39 0:00 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --log-error=/var/log/mysql/mysqld.log --pid-file=/var/run/mysql/mysqld.pid --socket=/var/run/mysql/mysql.sock --port=3306root 5609 0.0 0.0 2756 772 pts/2 S+ 15:39 0:00 grep --color=auto mysql
bitsCN.comlinux-6yo1:~ # /etc/init.d/mysql status
Checking for service MySQL: runningmysql.service - LSB: Start the MySQL database server Loaded: loaded (/etc/init.d/mysql) Active: active (running) since Wed, 2013-07-17 15:39:11 CST; 29s ago Process: 5100 ExecStart=/etc/init.d/mysql start (code=exited, status=0/SUCCESS) CGroup: name=systemd:/system/mysql.service ├ 5227 /bin/sh /usr/bin/mysqld_safe --mysqld=mysqld --use... └ 5575 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib...Jul 17 15:39:06 linux-6yo1.site mysql[5100]: Please report any problems with...!Jul 17 15:39:06 linux-6yo1.site mysql[5100]: The latest information about Ma....Jul 17 15:39:06 linux-6yo1.site mysql[5100]: You can find additional informa...:Jul 17 15:39:06 linux-6yo1.site mysql[5100]: http://dev.mysql.comJul 17 15:39:06 linux-6yo1.site mysql[5100]: Support MariaDB development by ...mJul 17 15:39:06 linux-6yo1.site mysql[5100]: Monty Program Ab. You can conta....Jul 17 15:39:06 linux-6yo1.site mysql[5100]: Alternatively consider joining ...:Jul 17 15:39:06 linux-6yo1.site mysql[5100]: http://kb.askmonty.org/en/contr.../Jul 17 15:39:11 linux-6yo1.site mysql[5100]: Starting service MySQL ..doneJul 17 15:39:11 linux-6yo1.site systemd[1]: Started LSB: Start the MySQL dat....

InnoDBBufferPool reduces disk I/O by caching data and indexing pages, improving database performance. Its working principle includes: 1. Data reading: Read data from BufferPool; 2. Data writing: After modifying the data, write to BufferPool and refresh it to disk regularly; 3. Cache management: Use the LRU algorithm to manage cache pages; 4. Reading mechanism: Load adjacent data pages in advance. By sizing the BufferPool and using multiple instances, database performance can be optimized.

Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages have advantages in their respective fields such as data analytics, enterprise applications, and system programming.

MySQL is worth learning because it is a powerful open source database management system suitable for data storage, management and analysis. 1) MySQL is a relational database that uses SQL to operate data and is suitable for structured data management. 2) The SQL language is the key to interacting with MySQL and supports CRUD operations. 3) The working principle of MySQL includes client/server architecture, storage engine and query optimizer. 4) Basic usage includes creating databases and tables, and advanced usage involves joining tables using JOIN. 5) Common errors include syntax errors and permission issues, and debugging skills include checking syntax and using EXPLAIN commands. 6) Performance optimization involves the use of indexes, optimization of SQL statements and regular maintenance of databases.

MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA


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