以下的文章主要介绍的是MySQL 数据库命令的实际应用,其中包括如何正确提升某个用户的相关权限,如何从相关的备份文件中获得恢复的实际操作步骤,以下就是文章的具体内容描述,望你会有所收获。 1:提升某个用户的权限 dbname 指定用户 grantallon*.*tosfsuse
以下的文章主要介绍的是MySQL 数据库命令的实际应用,其中包括如何正确提升某个用户的相关权限,如何从相关的备份文件中获得恢复的实际操作步骤,以下就是文章的具体内容描述,望你会有所收获。
1:提升某个用户的权限
dbname 指定用户
<ol class="dp-xml"><li class="alt"><span><span>grant all on *.* to sfsuser@'%'; </span></span></li></ol>
2:从备份文件中恢复
<ol class="dp-xml"><li class="alt">MySQL<span> –usfsuser –p111111 dbname </span><span></span> </li></ol>
3:登陆远程MySQL数据库
<ol class="dp-xml"><li class="alt">MySQL<span> -h10.0.0.1 -usfsuser -p111111; </span> </li></ol>
4:设置数据默认字符集
<ol class="dp-xml"><li class="alt"><span><span>vi /etc/my.cof </span></span></li></ol>
找到客户端配置[client] 在下面添加
default-character-set=utf8 默认字符集为utf8
在找到[MySQLd] 添加
default-character-set=utf8 默认字符集为utf8
<ol class="dp-xml"><li class="alt"><span><span class="attribute">init_connect</span><span>=</span><span class="attribute-value">'SET NAMES utf8'</span><span> </span></span></li></ol>
重新启动MySQL数据库
<ol class="dp-xml"> <li class="alt"><span>/etc/init.d/MySQL stop </span></li> <li> <span>/etc/init.d/</span>MySQL<span> start </span> </li> </ol>
进入MySQL 运行
<ol class="dp-xml"> <li class="alt"><span><span>show variables like 'character%'; </span></span></li> <li><span>+--------------------------+----------------------------+ </span></li> <li class="alt"><span>| Variable_name | Value | </span></li> <li><span>+--------------------------+----------------------------+ </span></li> <li class="alt"><span>| character_set_client | utf8 | </span></li> <li><span>| character_set_connection | utf8 | </span></li> <li class="alt"><span>| character_set_database | utf8 | </span></li> <li><span>| character_set_filesystem | binary | </span></li> <li class="alt"><span>| character_set_results | utf8 | </span></li> <li><span>| character_set_server | utf8 | </span></li> <li class="alt"><span>| character_set_system | utf8 | </span></li> <li> <span>| character_sets_dir | /usr/share/</span>MySQL<span>/charsets/ | </span> </li> <li class="alt"><span>+--------------------------+----------------------------+ </span></li> </ol>
5:慢查询日志
在MySQL数据库配置文件my.cnf中增加
log-slow-queries=/var/lib/MySQL/slowquery.log (指定日志文件存放位置,可以为空,系统会给一个缺省的文件host_name-slow.log)
long_query_time=2 ((包括所有5.*系列,5.1.21之前)的慢查询日志默认是以秒为单位的,其后的为毫秒 记录超过的时间,默认为10s)
log-queries-not-using-indexes (log下来没有使用索引的query,特别要注意检查慢查询的时候最好不要打开该控制,如果要打开控制最好装microtime slow query的补丁,免得你误会一些记录是慢查询.比如对整个表做count(*)的操作和其他没用索引但是速度很快的操作)
log-long-format (如果设置了,所有没有使用索引的查询也将被记录)
重启数据库以后用SHOW VARIABLES;查看对应的字段是否生效;

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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