best way for persistence in redis

shortcomings aof Configuration Introduction: The default is not to turn on aof, because Redis thinks that the RDB is sufficient to meet the needs of persistence, so here we need to modify the configuration, start aof OK, after the start, then there are two persistent strategies, then this time there will be a problem. This is not a conflict, because the RDB do the rdb thing, aof dry aof, so you can r

Open the running directory for Redis, select Database 2 (select 2, empty set) to see the last save time for Dump.rdb is 1:58 noon today.Add 2 data:View Dump.rdb again, save time is now (description from 1:58 to now no modified key)You can see the data that you just saved in Dump.rdb, but when you add a third data ADDR3, the modification time of DUMP.RDB is not changed and the snapshot backup frequency is not reached.Now choose the label of 3 database,

Databases in the server The Redis server saves all the databases in the DB array of the server state structure, and each item in the DB array is a REDISDB structure, and the length of an array of REDISDB structures represents the number of databases. The target database for Redis is database number No. 0 by default, but clients can switch databases by executing the SELECT commandInside the server,

The Redis storage is divided into memory storage, disk storage, and log files, which are configured with three parameters in the configuration file.Save seconds Updates,save Configuration, indicates how many times the update operation has been synchronized to the data file. This can be a combination of multiple conditions, such as the default configuration file settings, set three conditions.appendonly Yes/no ,appendonly configuration, indicates wheth

19:22:01 2014-08-27Introduction:Previously the functions of wait waitpid and exit were only generally understood, but looking at the aof and Rdb 2 persistence of Redis to handle the completion of the child process run out and what the parent process needs to do, so specific read the UNIX environment programming and Linux system programming 2 books Re-comb the whole point.Content:Generally: If the program re

One: Redis persistent configurationRedis persistence in 2 ways [snapshot, log] II: Configuration options for RDB snapshots Save900 1//900, 1 writes, resulting in a snapshotSave 300 1000//If there are 1000 writes in 300 seconds, a snapshot is generatedSave 60 10000//If there are 10,000 writes in 60 seconds, a snapshot is generated(These 3 options are masked,the RDB is disabled)Three: redis.conf the meaning o

The persistence of redis has two species of Rdb and aof. RDB is a record of the operation over a period of time, a disk configuration is more than a period of time the operation of the persistence of more than a few times. AOF enables you to persist each operation. Here we use AOF. Configuration, open the Redis confi

Causes the exception condition:1, three Redis node data cannot be persisted by an RDB2. Redis data can only be read and cannot be written (caused by problem 1), resulting in data cannot be added and updated directlyCurrent temporary processing methods:1, config set stop-writes-on-bgsave-error no first let data can write Redis, do not affect the data read and wri

10.1 Rdb file creation and onboardingThere are two Redis commands that can be used to generate an RDB file, one for save and the other for Bgsave.The Save command blocks the Redis server process until the Rdb file is created.The Bgsave command will derive a Zi Jin Chengguan responsible for creating the Rdb file, and the server process continues to process the command request.The loading of an RDB file is pe

first, there are two ways of Redis persistence: 1.RDB: Snapshots of In-memory database state 2.AOF: Write every write command to the file, similar to the MySQL binlog log RDB: Save the Redis in-memory database state to disk, RDB file is a A compressed binary file that enables you to restore the state of the data that generated the Rdb file. How the RDB is gen

Workflow for RDB:1. Executing the bgsave command, the Redis parent process determines whether a child process is currently executing, such as a rdb/aof child process, if there is a bgsave command to return directly.2. The parent process performs the fork operation to create the child process, and the parent process is blocked during the fork operation.3. After the parent process fork is finished, the Bgsave command returns the "* Background saving sta

Persistence: Storing data in a device that is not lost after a power outage, usually a hard diskHow the RDB works:After every n minutes or N writes, an RDB file is formed from the memory dump data, compressed , and placed in the backup directory (the red part can be configured by parameters)RDB Snapshot Related parameters:Save 1 #刷新快照到硬盘中, must meet the requirements of both participants trigger, that is, 900 seconds after at least 1 keywords change (3

mode TCP balance Leastconn server MARIADB1 192.168.91.141:330 6 Check port 3306 inter 2s rise 1 Fall 2 maxconn server mariadb2 192.168.91.142:3306 Check port 3306 inter 2s rise 1 Fall 2 Maxconn-server mariadb3 192.168.91.143:3306 Check port 3306 inter 2s rise 1 Fall 2 Maxconn ###### #Rabbit MQ Configuration ################# LisTen RABBITMQ bind 0.0.0.0:5672 mode TCP balance Leastconn server rabbitmq1 192.168.91.141:5672 Check port 5672 inter 2s ri SE 1 Fall 2 maxconn server rabbitmq2 192.168.9

Explanation 1: Although Redis is a single process, it has a separate sub-process for RDB operations, in order to ensure the consistency of the data, when the RDB operation fails, the main process stops writingThat's why stop-write-on-bgsave-error this order.How do I stop an RDB?Answer: The following three parameters will be masked out of the lineGetting Started with an RDB　　　　First step: To modify the configuration file to allow 60 seconds to write 3,

The understanding of individual pub/sub mechanisms provided by Redis is covered in the previous blog, as well as the idea of how to avoid one of the biggest flaws in Redis pub/sub-The persistence of messages (http://blog.csdn.net/canot/ article/details/51975566). This article is mainly about the code implementation of its idea (

Tags: precedence command cond not set restore binary format otherAn RDB in memory is saved as a file for the RDB to persist. RDB file when a binary file is being opened. One-load and storage The file is loaded at server startup (Rdbload ()) because the AOF update frequency is higher than the RDB, so if the AOF persistence feature is turned on, the server will first restore the db from AoF, and only aof shut down to restore the database from the RDB. T

Tags: slow fsync background write process rewrite stop time RorRedis Persistent Configuration There are 2 ways to persist Redis 1 snapshot 2 is log configuration options for Rdb snapshots: Save 1//within the range of 1 writes , a snapshot is generated Save +// if There are more than five writes in a second , a snapshot is generated Save 10000// if There are 10000 writes in a second , a snapshot is generated ( these 3 options are masked , the

Prerequisite: Set daemonize in redis.conf to Yes to ensure the daemon is turned on.First step: Create a startup script named Redis under the/etc/init.d/directoryWriting the boot-up script (Vi/etc/init.d/redis)The script (Redis) is as follows:# chkconfig:2345 90 10# Description:redis is a persistent key-value database#PATH =/usr/local/bin:/sbin:/usr/bin:/binredisp

Preface Distributed locks generally have three kinds of implementation methods: 1. Database optimistic lock; 2. Distributed lock based on Redis; 3. Distributed locks based on zookeeper. This blog will introduce the second way to implement distributed locks based on Redis. Although the Internet has a variety of redis d

The connection between Docker containers can be a lot of convenience, and the following records how the Redis container connected to it is connected through environment variables within its own container.Start with a Redis docker container named Redis, and then start your own Docker container, using "--link Redis:redis" to connect to the