这是一个简单的MySQL数据库备份shell脚本,适用于单台Linux服务器或者VPS的mysql数据库备份工作,工作原理是使用mysql的mysqldum
这是一个简单的MySQL数据库备份shell脚本,适用于单台Linux服务器或者VPS的mysql数据库备份工作,工作原理是使用mysql的mysqldump工具来导出数据库为.sql文件,然后将所有导出的文件打包归档。
然后我们在shell脚本中使用 scp命令把备份文件复制到另外一台备份机器,由于scp每次传送文件要密码因此我们需要使用 expect插件或者利用密钥。在这里介绍采用生成密钥对的方法。
1,生成密匙对,我用的是rsa的密钥。使用命令 "ssh-keygen -t rsa"生成的过程中提示输入密钥对保存位置及密码,直接回车,接受默认值就行了。
其中公共密钥保存在 ~/.ssh/id_rsa.pub,,私有密钥保存在 ~/.ssh/id_rsa 。
2,然后修改 .ssh 目录权限,chmod 755 ~/.ssh 。最后把 公共密钥复制到你要访问的机器上去,并保存为:~/.ssh/authorized_keys 。
scp -P 1110 ~/.ssh/id_rsa.pub daniel@*.*.*.*:/home/daniel/.ssh/authorized_keys(注意这里- P 为大写, 表示目标机器daniel 的ssh端口为1110,小写的p为源ssh端口修改ssh端口在文件/etc/ssh/sshd_config下 。)这里完成scp 脚本免密钥的方法介绍。
最后使用crontab定时执行脚本即可!
脚本如下:
#!/bin/bash
# description: MySQL buckup shell script
# author: Daniel
# web site: ~danewang/blog/
st=$(date +%s)
USER="root"
PASSWORD="*****"#用户名
DATABASE="myblogdb" #数据库用户密码
MAIL="abcd@gmail.com"#mail
BACKUP_DIR=/home/daniel/data_backup/ #备份文件存储路径
LOGFILE=/home/daniel/data_backup/data_backup.log #日志文件路径
DATE=`date +%Y%m%d-%H%M`#用日期格式作为文件名
DUMPFILE=$DATE.sql
ARCHIVE=$DATE.sql.tar.gz
OPTIONS="-u$USER -p$PASSWORD $DATABASE"
#判断备份文件存储目录是否存在,否则创建该目录
if [ ! -d $BACKUP_DIR ]
then
mkdir -p "$BACKUP_DIR"
fi
#开始备份之前,将备份信息头写入日记文件
echo " ">> $LOGFILE
echo "--------------------" >> $LOGFILE
echo "BACKUP DATE:" $(date +"%y-%m-%d %H:%M:%S") >> $LOGFILE
echo "-------------------" >> $LOGFILE
#切换至备份目录
cd $BACKUP_DIR
mysqldump $OPTIONS > $DUMPFILE
#判断数据库备份是否成功
if [[ $? == 0 ]]
then
tar czvf $ARCHIVE $DUMPFILE >> $LOGFILE 2>&1
echo "[$ARCHIVE] Backup Successful!" >> $LOGFILE
rm -f $DUMPFILE #删除原始备份文件,只需保留备份压缩包
# 把压缩包文件备份到其他机器上。
scp -P $ARCHIVE daniel@*.*.*.*:/home/daniel/data_backup/
else
echo "Database Backup Fail!" >> $LOGFILE
#备份失败后向管理者发送邮件提醒
mail -s "database:$DATABASE Daily Backup Fail!" $MAIL
fi
echo "Backup Process Done"
#删除3天以上的备份文件
#Cleaning
find $BACKUP_DIR -type f -mtime +2 -name "*.tar.gz" -exec rm -f {} \;
修改/etc/crontab
#vi /etc/crontab
在下面添加:
00 03 * * * root /data/backup/dump.sh注意/data/backup/dump.sh为脚本的存放位置.
表示每天3点钟执行备份。
重新启动crond
# /etc/rc.d/init.d/crond restart
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在CentOS实现MySQL数据库的自动备份

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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

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.

The steps to build a MySQL database include: 1. Create a database and table, 2. Insert data, and 3. Conduct queries. First, use the CREATEDATABASE and CREATETABLE statements to create the database and table, then use the INSERTINTO statement to insert the data, and finally use the SELECT statement to query the data.

MySQL is suitable for beginners because it is easy to use and powerful. 1.MySQL is a relational database, and uses SQL for CRUD operations. 2. It is simple to install and requires the root user password to be configured. 3. Use INSERT, UPDATE, DELETE, and SELECT to perform data operations. 4. ORDERBY, WHERE and JOIN can be used for complex queries. 5. Debugging requires checking the syntax and use EXPLAIN to analyze the query. 6. Optimization suggestions include using indexes, choosing the right data type and good programming habits.


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