rdb database

Tags: How to InformationThe Redis data is in memory, If Redis restarts or breaks for a certain time, Redis will persist the memory in an. rdb file on the hard disk, and accidentally deleted the. rdb file when you first started using Redis, but you just need to save normally or restart the Redis,rdb file for automatic generation.However, as the online business inc

Deploy RDB using the SparkSQL distributed SQL engine in Linux | install MySQL + Hive (Tutorial) and sparksqlrdb●Deploy MySQL # Find and delete local MySQLrpm-qa | grep mysqlrpm-e mysql-libs-5.1.66-2.el6_3.i686 -- nodeps # Install the specified version of MySQLrpm-ivh MySQL-server-5.1.73-1.glibc23.i386.rpm rpm-ivh MySQL-client-5.1.73-1.glibc23.i386.rpm # change the password of mysql (run the following command directly) /usr/bin/mysql_secure_installatio

:7.69gused_memory_lua:37888used_memory_lua_human:37.00kmaxmemory:0maxmemory_human:0bMaxmemory_policy:noevictionmem_fragmentation_ratio:9.51mem_allocator:jemalloc-4.0.3 # persistenceloading:0whether to persist files rdb_changes_since_last_save:0How many seconds before the last persistence rdb_bgsave_in_progress:0whether the Rdb file is being created rdb_last_save_time:1473217900Timestamp of the most recent successful creation of the

There was an error running Redis today with the following error message:(Error) Misconf Redis is configured to save the RDB snapshots, but was currently not able to persist on disk. Commands that may modify the data set is disabled. Please check your Redis logs for details about the error.Redis is configured to save a database snapshot, but it cannot be persisted to the hard disk at this time. The command u

Rdb:Writes a snapshot of an in-memory dataset to disk at a specified time interval, which is the jargon-snapshot snapshot, which, when restored, reads the snapshot file directly into memory. The RDB holds the Dump.rdb fileHow the RDB works:Redis creates (fork) a child process to persist, writes the data to a temporary file, finishes the persistence process, and replaces the last persisted file with the temp

Tag: Server initialization Specifies that the command time configuration is allowed to execute the name willBriefPersistence: Redis can synchronize data from memory to a hard disk in some form, making it possible to recover data from a record on a hard disk after a reboot, which is a process of persistence.Redis supports two ways of persisting, simply as follows:RDB Mode: Stores the in-memory data on the hard disk according to the specified rule "timed"AOF mode: The command itself is recorded af

Three: Common problems bgrewriteaof background process rewrite Aofbgsave background save Rdb Snapshot save Rdb snapshot Lastsave Last save time slaveof master-host Port,set the current instance to master slave flushall empty All library keys flushdb Clear all keys of the current library showdown [Save/Nosave] Note: If you accidentally run the Flushall, shutdown Nosave immediately,shut down the server and ed

Exception detailsException in thread "main" Redis.clients.jedis.exceptions.JedisDataException:MISCONF Redis are configured to save RDB snap Shots, but was currently not able-persist on disk. Commands that may modify the data set is disabled. Please check your Redis logs for details about the error.data continues to be written, reading speed is much lower than the write speed, Therefore, according to the online information:Stop-writes-on-bgsave-error Y

http://my.oschina.net/davehe/blog/174662RDB-In binary files that exist in Dump.rdbDump the whole DB, when the data are many, not suitable for frequent storage, save the time interval should be longerSave data Files Compact, recover Big data files fast　　If save, shutdown, slave before crash, then the middle of the operation is not able to recover.The only thing the parent process has to do when saving the RDB file is to fork out a child process, and th

There is a case in which a partial request timed out when troubleshooting Redis as an RDB. The preliminary judgment is that weTHP (Transparent Huge Pages) is turned on on the Redis server。 1) the page size of Linux itself is fixed 4KB, the 2.6.38 kernel adds THP, transparently supports the use of huge page (2MB), and is turned on by default. The advantage of starting THP is:-Reduce page fault. One page fault can load a larger chunk of memory. -A sm

One. OverviewThe persistence feature of Redis is the decision that Redis can be the core of a certain functional database.There are a total of two ways to persist in Redis, an RDB, and a aof approach.Note: We do not need to use the persistence of Redis, without using the persistence feature,Decide that we are using Redis as a cache, which is no different from memcache.Two. The fundamentals of an RDBRedis is a single process, and when we turn on

(Error) Misconf Redis is configured to save RDB snapshots, but are currently not able to persist on disk. Commands that may modify the data set are disabled. Please check Redis logs for details about the error. Use the following command to resolve: Config set Stop-writes-on-bgsave-error No Set ' name ' Shenhui ' -misconf Redis is configured to save RDB snapshots, but was currently not able to persist o

Connect Reids to get data when promptedRedis is configured to save the RDB snapshots, but was currently not able to persist on disk. Commands TOnline Search Data http://www.cnblogs.com/qq78292959/p/3994349.html tipsAdd a ' vm.overcommit_memory = 1 ' Restart or Run command in/etc/sysctl.confProblem solving.Reasons for investigation:Simply put: Redis when saving data to the hard disk in order to avoid the main process of animation, need to fork a master

Label:Today in the program, Jedis put data into the Redis process, "misconf Redis is configured to the save RDB snapshots, but was currently not able-persist on di SK "error;Then look at the Redis logs and see the error "Can ' t save in Background:fork:Cannot allocate memory", the hint is obvious "the fork process is not enough RAM!" "But there is still more than one g of memory;After online query, Redis saves data to the hard disk in order to avoid t

Tags: left and right database cat hard drive HREF hint recommended BSP ACK Today's second encounter with Redis "Misconf Redis is configured to save the RDB snapshots, but was currently not able to persist on disk" issue. This error message is the exception information that the Redis client tool throws when it saves data. Online check, many people are recommended "config set Stop-writes-on-bgsave-error no".

1. RdbWhen the condition is met, Redis will fork (create) A new thread, the data in memory will be written to a temporary file, the persistence process is finished, and then replace the last persisted file with this temporary file, the whole process, the main process does not do any IO operation, Ensures very high performance, at which time the master process can read and write operations. The disadvantage of RDB data persistence is that the last pers

The dump. rdb of Server 1 is put into Server 2 and 2 and cannot be read. Does anyone know what to do? The dump. rdb of Server 1 is put into Server 2 and 2 and cannot be read. Does anyone know what to do? Reply content: The dump. rdb of Server 1 is put into Server 2 and 2 and cannot be read.Does anyone know what to do? 1) version mismatch2) Different Size

Redis Problem Resolution (misconf Redis is configured to save RDB snapshots) (error) misconf Redis are configured to save Rdb snapshots, BU T is currently does able to persist on disk. Commands that may modify the data set is disabled.Please check your Redis logs for details about the error. Use the following command to resolve: config set stop-writes-on-bgsave-error no for details about the error. config

Tags: redisDbfilename redis.db//Persistent filesdir/home/redis/6379//directory where files are locatedSave 900 1//900 seconds Modify a key to be saved onceSave 300 10//300 seconds Modify 10 keys to be saved onceSave 60 10000//60 seconds Modify 10,000 keys to be saved onceThe above 3 save conditions should be viewed from the bottom up, with each condition being or the relationshipRdbcompression Yes//enable compressionRdbchecksum Yes//enable checksumStop-writes-on-bgsave-error Yes//error when dump

View the RDB file structure, found that the last 8 bytes is the CRC64 checksum, from the beginning of the file to the 8-byte check code before the FF End Code (inclusive), after the CRC64 check calculation found that the last 8 bytes is the small-end mode implementation. Refer to Redis's CRC64 implementation code, click to view The Java code is as follows: 1 package com.jadic.utils; 2 3 /** 4 * @author Jadic