iptables
配置网卡
方法一:把以下命令放在/etc/rc.d/init.d/rc.local文件中
[root@local root]# ifconfig eth0 down
[root@local root]# ifconfig eth0 up
[root@local root]# ifconfig eth0 192.168.0.2 netmask 255.255.255.0
[root@local root]# route add default gw 192.168.1.2
方法二:
vi /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
ONBOOT=yes
BOOTPROTO=static
IPADDR=219.136.241.211
NETMASK=255.255.255.128
GATEWAY=192.168.1.1
vi /etc/resolv.conf
nameserver 8.8.8.8
/etc/init.d/network restart
配置防火墙
[root@local root]# vi /etc/sysconfig/iptables
[root@local root]# service iptables restart
yum安装mysql
[root@local root]# yum list | grep mysql
[root@local root]# yum list | grep mysql-server
/sbin/chkconfig –-add mysqld [在服务清单中添加mysql服务]
service mysqld start;(即/etc/init.d/mysqld start。也可设成开机自启动:/sbin/chkconfig mysqld on)
更改 root 密码: mysqladmin -u root password 'newpassword'
添加mysql用户: GRANT ALL PRIVILEGES ON *.* TO 'user'@'localhost' IDENTIFIED BY 'password';
grant all on *.* to "root"@"%" identified by "123456";
(update user set host = ’%’ where user = ’root’;)
重载权限: mysql> FLUSH PRIVILEGES;
删除test数据库: mysql -u root -p mysql> DROP DATABASE test;
删除匿名帐户: DELETE FROM mysql.user WHERE user = '';
关机
shutdown -h now
Windows
route change 0.0.0.0 mask 0.0.0.0 192.168.1.1

MySQLstringtypesimpactstorageandperformanceasfollows:1)CHARisfixed-length,alwaysusingthesamestoragespace,whichcanbefasterbutlessspace-efficient.2)VARCHARisvariable-length,morespace-efficientbutpotentiallyslower.3)TEXTisforlargetext,storedoutsiderows,

MySQLstringtypesincludeVARCHAR,TEXT,CHAR,ENUM,andSET.1)VARCHARisversatileforvariable-lengthstringsuptoaspecifiedlimit.2)TEXTisidealforlargetextstoragewithoutadefinedlength.3)CHARisfixed-length,suitableforconsistentdatalikecodes.4)ENUMenforcesdatainte

MySQLoffersvariousstringdatatypes:1)CHARforfixed-lengthstrings,2)VARCHARforvariable-lengthtext,3)BINARYandVARBINARYforbinarydata,4)BLOBandTEXTforlargedata,and5)ENUMandSETforcontrolledinput.Eachtypehasspecificusesandperformancecharacteristics,sochoose

TograntpermissionstonewMySQLusers,followthesesteps:1)AccessMySQLasauserwithsufficientprivileges,2)CreateanewuserwiththeCREATEUSERcommand,3)UsetheGRANTcommandtospecifypermissionslikeSELECT,INSERT,UPDATE,orALLPRIVILEGESonspecificdatabasesortables,and4)

ToaddusersinMySQLeffectivelyandsecurely,followthesesteps:1)UsetheCREATEUSERstatementtoaddanewuser,specifyingthehostandastrongpassword.2)GrantnecessaryprivilegesusingtheGRANTstatement,adheringtotheprincipleofleastprivilege.3)Implementsecuritymeasuresl

ToaddanewuserwithcomplexpermissionsinMySQL,followthesesteps:1)CreatetheuserwithCREATEUSER'newuser'@'localhost'IDENTIFIEDBY'password';.2)Grantreadaccesstoalltablesin'mydatabase'withGRANTSELECTONmydatabase.TO'newuser'@'localhost';.3)Grantwriteaccessto'

The string data types in MySQL include CHAR, VARCHAR, BINARY, VARBINARY, BLOB, and TEXT. The collations determine the comparison and sorting of strings. 1.CHAR is suitable for fixed-length strings, VARCHAR is suitable for variable-length strings. 2.BINARY and VARBINARY are used for binary data, and BLOB and TEXT are used for large object data. 3. Sorting rules such as utf8mb4_unicode_ci ignores upper and lower case and is suitable for user names; utf8mb4_bin is case sensitive and is suitable for fields that require precise comparison.

The best MySQLVARCHAR column length selection should be based on data analysis, consider future growth, evaluate performance impacts, and character set requirements. 1) Analyze the data to determine typical lengths; 2) Reserve future expansion space; 3) Pay attention to the impact of large lengths on performance; 4) Consider the impact of character sets on storage. Through these steps, the efficiency and scalability of the database can be optimized.


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