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Redis advanced features Slow query Many storage systems (such as MySQL) provide slow query logs to help developers and operation and maintenance personnel locate the slow operation of the system. The so-called slow query log is that the system calculates the execution time of each command before and after the command is executed. When it exce ...

Video link: https://www.bilibili.com/video/BV1iF411z7Pu 1.3. 1. Basic operation of index 1.3. 1.1. Index overview What is the index Index is to build a data model through some algorithm to quickly find the row with a specific value in a column. Without index, MySQL must read the whole table from the first record until the relevant row ...

Zero foundation of MySQL from introduction to mastery (constraint) MySQL constraints concept constraint Constraints are actually constraints on the data in the table effect The purpose of adding constraints is to ensure the integrity and effectiveness of the records in the table. For example, the values of the column (mobile phone number) ...

1. hash data type and structure 1.1 introduction to hash types Redis hash data structure is a key value pair (key value) set, which is a mapping table of field and value of string type. Redis itself is a key value database, so the hash data structure is equivalent to another layer of key value data in value. Therefore, the hash data structure ...

Author introductionHou YangSphereEx middleware R & D Engineer, Apache ShardingSphere Contributor.At present, it focuses on the design and R & D of ShadowDB and full link voltage measurement.What is full link voltage measurementWith the rapid development of the Internet industry, the business has also entered a rapid expansion stage. It ...

WeChat official account: operation and development story, author: wanger one Upgrade scheme 1 Scope of influence During the upgrade, the existing system will not be affected, and the system will maintain normal operation. After the upgrade, the availability test will be conducted for a period of time, and the production monitoring will b ...

Computer information system Definition: data intensive, man-machine interactive computer system with the main purpose of providing information services Features: large quantity, lasting, sharing and providing a variety of services Structure: 1,Resource Management(DBMS and DB All on this layer) Various data information and resource manage ...

Some students are so pissing. You can understand it. If you don't do it yourself, how can you understand it thoroughly? Let's do it together! Usage scenario and model selection The distributed multi node deployment mode makes it possible for shared variables to be operated at the same time. In case of data consistency requirements, global loc ...

The original content of GreatSQL community cannot be used without authorization. Please contact Xiaobian and indicate the source for reprint.Question 1, is there a recommended reference for the best configuration of MGR operationAt the sharing meeting of Guangzhou station of "3306 π" community on May 22, Lou Shuai, CTO of Wanli dat ...

Master slave synchronization Note: the code in this article may involve misuse of Chinese characters, such as quotation marks and commas. Ask the paster to debug and modify the self code. Open the primary server mysql database configuration file Find my. In the mysql installation directory Ini configuration file, add under [mysqld] server-i ...