bitsCN.com
修复以损坏的MySQL数据表的实际操作在实际中是我们经常用到的,以下的文章主要是介绍正确修复以损坏的MySQL数据表的实际操作步骤,以下就是正文的介绍,希望会给你带来一些帮助在此方面。
于断电或非正常关机而导致MySQL(和PHP搭配之最佳组合)数据库出现错误是非常常见的问题。有两种方法,一种方法使用MySQL(和PHP搭配之最佳组合)的check table和repair table 的sql语句,另一种方法是使用MySQL(和PHP搭配之最佳组合)提供的多个myisamchk, isamchk数据检测恢复工具。前者使用起来比较简便。推荐使用。
1. check table 和 repair table
登陆MySQL(和PHP搭配之最佳组合) 终端:
MySQL(和PHP搭配之最佳组合) -uxxxxx -p dbname
1.> check table tabTest;
如果出现的结果说Status是OK,则不用修复,如果有Error,可以用:
1.> repair table tabTest;
进行修复,修复之后可以在用check table命令来进行检查。在新版本的phpMyAdmin里面也可以使用check/repair的功能。
2. myisamchk, isamchk
其中myisamchk适用于MYISAM类型的数据表,而isamchk适用于ISAM类型的数据表。这两条命令的主要参数相同,一般新的系统都使用MYISAM作为缺省的数据表类型,这里以myisamchk为例子进行说明。当发现某个数据表出现问题时可以使用:
1.myisamchk tablename.MYI
进行检测,如果需要修复的话,可以使用:
1.myisamchk -of tablename.MYI
关于myisamchk的详细参数说明,可以参见它的使用帮助。需要注意的时在进行修改时必须确保MySQL(和PHP搭配之最佳组合)服务器没有访问这个数据表,保险的情况下是最好在进行检测时把MySQL(和PHP搭配之最佳组合)服务器Shutdown掉。
另外可以把下面的命令放在你的rc.local里面启动MySQL(和PHP搭配之最佳组合)服务器前:
1.[ -x /tmp/MySQL(和PHP搭配之最佳组合).sock ] && /pathtochk/myisamchk -of /DATA_DIR/*/*.MYI
其中的/tmp/MySQL(和PHP搭配之最佳组合).sock是MySQL(和PHP搭配之最佳组合)监听的Sock文件位置,对于使用RPM安装的用户应该是/var/lib/MySQL(和PHP搭配之最佳组合)/MySQL(和PHP搭配之最佳组合).sock,对于使用源码安装则是/tmp/MySQL(和PHP搭配之最佳组合).sock可以根据自己的实际情况进行变更,而pathtochk则是myisamchk所在的位置,DATA_DIR是你的MySQL(和PHP搭配之最佳组合)数据库存放的位置。
需要注意的时,如果你打算把这条命令放在你的rc.local里面,必须确认在执行这条指令时MySQL(和PHP搭配之最佳组合)服务器必须没有启动!
检测修复所有数据库(表)
MySQL(和PHP搭配之最佳组合)check -A -o -r -p
以上的相关内容就是对修复损坏的MySQL数据表的介绍,望你能有所收获。

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.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

WebStorm Mac version
Useful JavaScript development tools

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

SublimeText3 Linux new version
SublimeText3 Linux latest version

Zend Studio 13.0.1
Powerful PHP integrated development environment
