Implementing the median Algorithm in MySQL

Implementing the median Algorithm in MySQL Purpose: MySQL does not have a specific median algorithm. For those unfamiliar with SQL, median can only be written in Java or other languages. It is not recommended that you use MySQL to complete median

Detailed description of Redis Cluster deployment and Construction

Detailed description of Redis Cluster deployment and Construction I 've been on the road to Oracle for many years. It's also a good feeling to change my feeling and try new knowledge. Redis, an ultra-light memory database, is a very good product

Implementation of Redis database read/write splitting

Implementation of Redis database read/write splitting Redis is a NoSQL document database. It is stored in memory through the key-value structure. Redis reads 110000 times/s and writes 81000 times/s, high Performance and wide application scope. The

Solution to Oracle temporary tablespace being too large

Solution to Oracle temporary tablespace being too large There are two ways to solve the problem of temporary tablespace too much in Oracle. One is to increase the size of the temporary tablespace and the other is to create a temporary

Deploying MariaDB Galera Cluster architecture in CentOS 7.4

Deploying MariaDB Galera Cluster architecture in CentOS 7.4 Mariadb galera Cluster installation:Operating System: CentOS 7.4Number of clusters: 3 nodesHost information: 192.168.153.142 node1 selinux = disabled firewalld disabled192.168.153.143 node2

Dangers of slow query in MySQL Databases

Dangers of slow query in MySQL Databases 1. When a slow query occurs in a MySQL database, it is dangerous. Other DDL operations may cause the entire database to wait. It can be divided into the following situations: When a table is a MyiSAM table,

Redis storage key-Value Method

Redis storage key-Value Method Redis is an in-memory database that stores key-value pairs. Its key-value storage method is similar to HashMap in Java. The structure used to characterize the redis database is redisDb (in the server. h file). By

Primary Key of the InnoDB Storage engine table

Primary Key of the InnoDB Storage engine table In the InnoDB Storage engine, tables are organized and stored in the order of primary keys. In an InnoDB Storage engine table, each table has a primary key. If the primary key is not explicitly defined

Use the Oracle analysis function ROW_NUMBER ()

Use the Oracle analysis function ROW_NUMBER () 1. row_number () over () sorting function: (1) row_number () over () group sorting function: When the row_number () over () function is used, the execution of grouping and sorting in over () is later

Description of InnoDB tablespace, segments, and zones

Description of InnoDB tablespace, segments, and zones 1. The tablespace is the highest level of the logic structure of the InnoDB Storage engine. All data is stored in the tablespace. By default, the InnoDB Storage engine has only one tablespace

Conversion of RR isolation level to RC isolation level in MySQL

Conversion of RR isolation level to RC isolation level in MySQL First understand the difference between RR (REPEATABLE-READ) and RC (READ-COMMITTED. The RR isolation level adds a gap lock, which avoids Phantom reads and prevents repeated reads, so

MySQL Benchmark Test Tool MySQLSlap instance

MySQL Benchmark Test Tool MySQLSlap instance MySQLSlap is a benchmark tool provided by MySQL. It can be used without installation. The following describes how to use MySQLSlap to perform basic MySQL tests on the server. 1. cd/usr/local/mysql/bin/ Go

Greenplum distributed Framework Structure

Greenplum distributed Framework Structure1. Basic Architecture Greenplum (GPDB) is a typical Shared-Nothing distributed database system. GPDB has a central control node (Master) to coordinate the entire system and run multiple database instances

Steps and solutions for installing Redis in Linux

Steps and solutions for installing Redis in Linux This document details the steps for installing Redis in Linux and the solutions to related problems. Step 1: Decompress the installation package on the Windows platform and copy the package to

Use sysbench for MySQL stress testing

Use sysbench for MySQL stress testing 1. Background Percona is a multi-threaded system stress testing tool that can evaluate the system performance based on various factors that affect the performance of database servers. For example, it can be used

Detailed analysis of high-availability Redis service architecture construction

Detailed analysis of high-availability Redis service architecture construction Memory-based Redis should be the most commonly used key-value database in various web development businesses. We often use it to store user login states (Session storage)

Warning Information solution after Redis is started

Warning Information solution after Redis is started Solutions for Redis-related problems. 1st cases: after we started the Redis server, we will see three warnings. If we didn't see them, it would be good, but I did. If you see it, you cannot ignore

MySQL Stored Procedure

MySQL Stored Procedure A stored procedure is a set of SQL statements stored on the database server. You can run these SQL statement commands by calling a specified name in the query. Introduction The SQL statement needs to be compiled and then

Notes about MySQL Indexes

Notes about MySQL Indexes Index In fact, the data in the database is stored by page.In fact, indexes are stored by page.Therefore, in essence, indexes also occupy hard disk space (in exchange for the greatest benefit with the minimum

Changing the Linux host name causes MySQL to fail to start and restart

Changing the Linux host name causes MySQL to fail to start and restart MySQL cannot be restarted, shut down, started, or used. If you modify the host name, you can disable all MySQL processes and start MySQL. Today, I saw that my host name was

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