Programmer Group

less 1 -- single quote character injection Character injection, single quotation mark Followed by the website ?id=1 Normal display, then Judge injection point ?id=1' and 1=1--+ Replace 1 = 1 with 1 = 2. No error is reported, but no information is displayed, indicating that character injection can be used after Number of judgmen ...

preface Most web development data are stored in the database, but with the increase of data, our interface will be very slow. At this time, we will introduce redis to cache data that will not change frequently, so as to achieve the effect of fast data response stand-alone In spring, redis is introduced to configure the link factory of redis. ...

Sysbench is a popular testing tool. It is mainly used to test the performance of fileio, cpu, memory, threads, mutex, etc., but the most important thing is to test the performance of databases. It is often used to test MySQL, Drizzle, AttachSQL, Oracle, PostgreSQL and other related databases. It can also be extended to support other databases a ...

concept Brief introduction to Redis redis is a nosql database nosql: not only sql, that is, a non relational database Why learn nosql Memory storage is 100000 times faster than disk reading of traditional relational database The bandwidth of memory is also much higher than that of disk Mainstream nosql database Advantages of R ...

preface Tip: Here you can add the general contents to be recorded in this article: For example, with the continuous development of artificial intelligence, machine learning technology is becoming more and more important. Many people have started learning machine learning. This paper introduces the basic content of machine learning. Ti ...

MongoDB cluster and security Replica set It is a group of Mongod services that maintain the same data set. Replica set can provide redundancy and high availability. It is the basis of all production deployments. At the same time, it is also similar to the master-slave cluster with automatic fault recovery function. Multiple machines are ...

        The previous article introduced the operation of CRUD of MongoDB using MongoTemplate. Then, the previous article will continue to introduce the operation of CRUD of MongoDB using MongoRepository.          To review the above articles, you can click the link to view the link   CRUD Mong ...

Construction of Redis master-slave cluster and analysis of master-slave replication principle preface In the last article, I analyzed how to build a master-slave cluster and the principle of master-slave replication; This article continues to analyze the continuous sinking of clusters, common runtime detection tools, the principle of sentinel ...

The previous chapter tested the serial backup and recovery of KADB, pg_dump/pg_restore. This chapter tests the parallel backup and recovery gpbackup/gprestore of KADB. Because pg_dump and pg_restore is limited by the master node and cannot meet the backup and recovery of a large amount of data. Therefore, KADB provides gpbackup and gprestore ...

In my spare time, I sorted out the ranking function previously realized by Redis Zset data type. preface The reason why redis was selected for the ranking function is that there are a large amount of user data, nearly 200000 people, and it is not impossible to check the top 100 ranking from the database, but it is not enough to see compar ...