之前虚拟机里装的系统都是ubuntu,后来同事说一般的服务器都是安装的centos,所以又重新倒腾了centos系统。当然,首先得搭建PHP环
之前虚拟机里装的系统都是Ubuntu,后来同事说一般的服务器都是安装的CentOS,所以又重新倒腾了centos系统。
当然,首先得搭建PHP环境。下载的源码mysql,版本是5.5.25,最新的好像是5.5.4。这里记住,一定要下载源码,在mysql官网下载时,会提示你选择平台,,选择下拉菜单中的最底下一个Source Code。
按照之前ubuntu安装的步骤安装后,启动mysql启动不起来。错误代码为“ The server quit without updating PID file(/var/lib/mysql/CentOS.pid)”,百度和google都搜索了一些资料,基本一致,对我没帮助,按照他们说的修改了也不行。最终成功搞定。
第一步:我们首先安装依赖库和开发工具
#依赖库和开发工具 yum -y install gcc gcc-c++ autoconf libjpeg libjpeg-devel libpng libpng-devel freetype freetype-devel libxml2 libxml2-devel zlib zlib-devel glibc glibc-devel glib2 glib2-devel bzip2 bzip2-devel ncurses ncurses-devel curl curl-devel e2fsprogs e2fsprogs-devel krb5 krb5-devel libidn libidn-devel openssl openssl-devel openldap openldap-devel nss_ldap openldap-clients openldap-servers #Nginx yum -y install pcre-devel zlib-devel #Php yum -y install gd-devel libjpeg-devel libpng-devel freetype-devel libxml2-devel curl-devel freetype-devel #Mysql yum -y install bison gcc gcc-c++ autoconf automake zlib* libxml* ncurses-devel libtool-ltdl-devel* mysql-devel
第二步:由于mysql5.5开始,不再使用configure安装,而是使用cmake。所以需要先安装cmake
wget http:// tar -zxvf cmake-2.8.6.tar.gz cd cmake-2.8.6/ ./configure make && make install
第三步:cmake安装mysql(我已经下载好了mysql源码文件,放在U盘里,拷贝到/tmp目录下)
//进入/tmp目录下
tar -zxvf mysql-5.5.25.tar.gz
cd mysql-5.5.25
cmake \
-DCMAKE_INSTALL_PREFIX=/usr/local/webserver/mysql \
-DMYSQL_DATADIR=/user/local/webserver/mysql/data \
-DSYSCONFDIR=/etc \
-DEXTRA_CHARSETS=all \
-DDEFAULT_CHARSET=utf8 \
-DDEFAULT_COLLATION=utf8_general_ci \
-DWITH_INNOBASE_STORAGE_ENGINE=1 \
-DWITH_ARCHIVE_STORAGE_ENGINE=1 \
-DWITH_BLACKHOLE_STORAGE_ENGINE=1 \
-DWITH_FEDERATED_STORAGE_ENGINE=1 \
-DWITH_PARTITION_STORAGE_ENGINE=1 \
-DWITH_PERFSCHEMA_STORAGE_ENGINE=1 \
-DMYSQL_UNIX_ADDR=/tmp/mysqld.sock \
-DMYSQL_TCP_PORT=3306 \
-DWITH_DEBUG=0 \
-DENABLED_LOCAL_INFILE=1
回车执行,执行完成后继续执行 make && make install
第四步:设置mysql
#设置Mysql #在support-files目录中有五个配置信息文件(这里很重要,一定要根据自己的内存复制对应的cnf文件,否则mysql始终起不来): #my-small.cnf (内存64M) #my-medium.cnf (内存 128M) #my-large.cnf (内存 512M) #my-huge.cnf (内存 1G-2G) #my-innodb-heavy-4G.cnf (内存 4GB) cd /usr/local/webserver/mysql cp ./support-files/my-huge.cnf /etc/my.cnf vi /etc/my.cnf #在 [mysqld] 段增加 datadir = /data/mysql wait-timeout = 30 max_connections = 512 default-storage-engine = MyISAM #在 [mysqld] 段修改 max_allowed_packet = 16M

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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