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mysql的存储引擎myisam和innodb以及memory
memory以后会介绍到
innodb支持事物，外键以及行锁，mysql不支持
innodb不支持fulltext索引的类型
innodb不保存具体行数
innodb的auto_increment不支持联合索引
innodb删除表的时候是一行行删除
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大型网站对于数据库的操作优化
1.读写分离，采用主/辅的方式，来分散数据的压力，提高查询速度
2.按照业务特点横向或者纵向分割数据库。简单的来向就是大库变小库，大表变小表，来提高数据库的访问效率。一般来讲，一个数据库具有很多表或一张表有N多的记录，都会明显降低数据库的服务能力，比如mysql数据表记录达到2000W条左右，性能会降到几乎无法忍受。
数据库出现的下一瓶颈
1.事物操作：事物中设计的数据表在运行的过程中将会加锁。在这种情况下，访问这些表的数据会出现延迟
2.数据更新：数据库任何的表在数据更新的过程中，同样会被加锁，则同样会出现延迟
memcache就不会出现以上的情况。
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Adding Users to MySQL: The Complete TutorialMay 12, 2025 am 12:14 AMMastering the method of adding MySQL users is crucial for database administrators and developers because it ensures the security and access control of the database. 1) Create a new user using the CREATEUSER command, 2) Assign permissions through the GRANT command, 3) Use FLUSHPRIVILEGES to ensure permissions take effect, 4) Regularly audit and clean user accounts to maintain performance and security.
Mastering MySQL String Data Types: VARCHAR vs. TEXT vs. CHARMay 12, 2025 am 12:12 AMChooseCHARforfixed-lengthdata,VARCHARforvariable-lengthdata,andTEXTforlargetextfields.1)CHARisefficientforconsistent-lengthdatalikecodes.2)VARCHARsuitsvariable-lengthdatalikenames,balancingflexibilityandperformance.3)TEXTisidealforlargetextslikeartic
MySQL: String Data Types and Indexing: Best PracticesMay 12, 2025 am 12:11 AMBest practices for handling string data types and indexes in MySQL include: 1) Selecting the appropriate string type, such as CHAR for fixed length, VARCHAR for variable length, and TEXT for large text; 2) Be cautious in indexing, avoid over-indexing, and create indexes for common queries; 3) Use prefix indexes and full-text indexes to optimize long string searches; 4) Regularly monitor and optimize indexes to keep indexes small and efficient. Through these methods, we can balance read and write performance and improve database efficiency.
MySQL: How to Add a User RemotelyMay 12, 2025 am 12:10 AMToaddauserremotelytoMySQL,followthesesteps:1)ConnecttoMySQLasroot,2)Createanewuserwithremoteaccess,3)Grantnecessaryprivileges,and4)Flushprivileges.BecautiousofsecurityrisksbylimitingprivilegesandaccesstospecificIPs,ensuringstrongpasswords,andmonitori
The Ultimate Guide to MySQL String Data Types: Efficient Data StorageMay 12, 2025 am 12:05 AMTostorestringsefficientlyinMySQL,choosetherightdatatypebasedonyourneeds:1)UseCHARforfixed-lengthstringslikecountrycodes.2)UseVARCHARforvariable-lengthstringslikenames.3)UseTEXTforlong-formtextcontent.4)UseBLOBforbinarydatalikeimages.Considerstorageov
MySQL BLOB vs. TEXT: Choosing the Right Data Type for Large ObjectsMay 11, 2025 am 12:13 AMWhen selecting MySQL's BLOB and TEXT data types, BLOB is suitable for storing binary data, and TEXT is suitable for storing text data. 1) BLOB is suitable for binary data such as pictures and audio, 2) TEXT is suitable for text data such as articles and comments. When choosing, data properties and performance optimization must be considered.
MySQL: Should I use root user for my product?May 11, 2025 am 12:11 AMNo,youshouldnotusetherootuserinMySQLforyourproduct.Instead,createspecificuserswithlimitedprivilegestoenhancesecurityandperformance:1)Createanewuserwithastrongpassword,2)Grantonlynecessarypermissionstothisuser,3)Regularlyreviewandupdateuserpermissions
MySQL String Data Types Explained: Choosing the Right Type for Your DataMay 11, 2025 am 12:10 AMMySQLstringdatatypesshouldbechosenbasedondatacharacteristicsandusecases:1)UseCHARforfixed-lengthstringslikecountrycodes.2)UseVARCHARforvariable-lengthstringslikenames.3)UseBINARYorVARBINARYforbinarydatalikecryptographickeys.4)UseBLOBorTEXTforlargeuns
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