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关于MYSQL LOAD DATA LOCAL INFILE支持问题 1.执行报错：ERROR 1148 (42000): The used command is not allowed with this MySQL version解决方法： 先进入MYSQL检查一下版本号：5.1或者以上的都支持。mysql> select version() 1.由于MYSQL编译安装时默认不允许执行这个命令。1)安装时加上 --enable-local-infile 参数就可以了执行了。./configure --prefix=/usr/local/mysql --enable-local-infilemake make install 2.可以在执行命中加上--local-infile=1 参数即可解决。如：/usr/local/mysql/bin/mysql -uroot -h192.168.0.2 -proot databaseName --local-infile=1 -e "LOAD DATA LOCAL INFILE 'data.txt' into table test(name,sex) " bitsCN.com
MySQL String Types: Storage, Performance, and Best PracticesMay 10, 2025 am 12:02 AMMySQLstringtypesimpactstorageandperformanceasfollows:1)CHARisfixed-length,alwaysusingthesamestoragespace,whichcanbefasterbutlessspace-efficient.2)VARCHARisvariable-length,morespace-efficientbutpotentiallyslower.3)TEXTisforlargetext,storedoutsiderows,
Understanding MySQL String Types: VARCHAR, TEXT, CHAR, and MoreMay 10, 2025 am 12:02 AMMySQLstringtypesincludeVARCHAR,TEXT,CHAR,ENUM,andSET.1)VARCHARisversatileforvariable-lengthstringsuptoaspecifiedlimit.2)TEXTisidealforlargetextstoragewithoutadefinedlength.3)CHARisfixed-length,suitableforconsistentdatalikecodes.4)ENUMenforcesdatainte
What are the String Data Types in MySQL?May 10, 2025 am 12:01 AMMySQLoffersvariousstringdatatypes:1)CHARforfixed-lengthstrings,2)VARCHARforvariable-lengthtext,3)BINARYandVARBINARYforbinarydata,4)BLOBandTEXTforlargedata,and5)ENUMandSETforcontrolledinput.Eachtypehasspecificusesandperformancecharacteristics,sochoose
How to Grant Permissions to New MySQL UsersMay 09, 2025 am 12:16 AMTograntpermissionstonewMySQLusers,followthesesteps:1)AccessMySQLasauserwithsufficientprivileges,2)CreateanewuserwiththeCREATEUSERcommand,3)UsetheGRANTcommandtospecifypermissionslikeSELECT,INSERT,UPDATE,orALLPRIVILEGESonspecificdatabasesortables,and4)
How to Add Users in MySQL: A Step-by-Step GuideMay 09, 2025 am 12:14 AMToaddusersinMySQLeffectivelyandsecurely,followthesesteps:1)UsetheCREATEUSERstatementtoaddanewuser,specifyingthehostandastrongpassword.2)GrantnecessaryprivilegesusingtheGRANTstatement,adheringtotheprincipleofleastprivilege.3)Implementsecuritymeasuresl
MySQL: Adding a new user with complex permissionsMay 09, 2025 am 12:09 AMToaddanewuserwithcomplexpermissionsinMySQL,followthesesteps:1)CreatetheuserwithCREATEUSER'newuser'@'localhost'IDENTIFIEDBY'password';.2)Grantreadaccesstoalltablesin'mydatabase'withGRANTSELECTONmydatabase.TO'newuser'@'localhost';.3)Grantwriteaccessto'
MySQL: String Data Types and CollationsMay 09, 2025 am 12:08 AMThe 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.
MySQL: What length should I use for VARCHARs?May 09, 2025 am 12:06 AMThe 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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