Programmer Think

Databases store data with tables as carriers. Different tables often represent different entities. As a domestic self-developed key value nosql database, tcallusdb supports two types of tables: protobuf(Protocol Buffers) table and TDR (tent data representation) table. Protobuf is a descriptive language developed by Google, which serializes str ...

1, MongoDB concept 1. Using business application scenarios The specific application scenarios are as follows: 1) In social scenes, MongoDB is used to store user information and circle of friends information published by users, and the functions of nearby people and places are realized through geographical location index. 2) In the g ...

explain Detailed implementation ideas and experimental principles are provided here, and most of the code at the skeleton level is provided. Not all codes are provided.Complete code. If you really need it, please send a private letter or leave a message. Overall architecture The overall experimental description of lab4 is very lengthy. We ne ...

Redis detailed notes Notes: the Redis course of crazy talking about Java in station B: https://www.bilibili.com/video/BV1S54y1R7SB 1, NoSQL overview 1. Why use NoSQL Now is the era of big data (data that cannot be solved by ordinary databases: big data (mass storage and parallel computing)) SQL => NoSQL 1. Bottleneck in sta ...

redis string source code analysis For details, please refer to the redis source code SDS H this file /* Note: sdshdr5 is never used, we just access the flags byte directly. * However is here to document the layout of type 5 SDS strings. */ /* In all structures: * len Indicates the length used * alloc Indicates the usable length * ...

1. Defects of sentinel mode In sentinel mode, there is still only one Master node. Sentinel mode does not relieve write pressure when concurrent write requests are large. 2. Redis cluster concept (1) A distributed network service cluster composed of multiple Redis servers; (2) There are multiple Master master nodes in the cluster, and each ...

character stringThe standard form of string in C language is NULL(0x \ 0 in hexadecimal) as the terminator. If you want to obtain the length of string, you need to use strlen standard library function. The algorithm complexity of this function is O(n), and you need to traverse the whole string. Redis can't afford such a slow speed,Therefore, th ...

About NoSQL overview 1, Development of NoSQL 1. Stand alone MySQL Era In the 1990s, the number of visits to a website was generally not too large, and a single database was enough. With the increase of users, the website has the following problems: When the data volume increases to a certain extent, the stand-alone database cannot be put do ...

1. Initial MySql 1.1 why learn database? 1. Job skill demand 2. In today's world, those who get data get the world 3. Method of storing data 4. How to keep a large amount of data in programs and websites for a long time? 5. Database is almost the core of software system. 1.2. What is a database? DataBase (DB for short) Concept: it is a ...

1. Introduction to NoSQL development 1.1 technology development NoSQL: mainly used to solve performance related problems. 1. Monomer Era However, with the rapid increase in the amount of data, the application server will have CPU and memory pressure, and the database service will have IO pressure. 2. Solve CPU and memory pressure ...