rdb database

Tags: routeros Note Restart big document get rest attribute out1 AOF-----> AppendOnly Yes 2 cp appendonly.aof to Redis database directory that is the DIR keyword in config file 3 restart service2 RDB-----> AppendOnly No 2 cp dump.rdb to Redis database directory that is the DIR keyword in config file 3 restart service If only AOF is configured, the AOF fi

Tags: keyword--synchronous loading targe out technology OSS based on1. The Redis recovery mechanism If only AOF is configured, the AOF file recovery data is loaded when the reboot is restarted; If both RDB and AOF are configured, the boot is only loaded with AOF file recovery data; If only the RDB is configured, startup is the load dump file to recover the data. 2. Recovering data from

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 persiste

A database based on a relational model.A relational database is a collection of data and database objects.Overview: consists of an association between a data table and a data table. A data table is a two-dimensional table that typically consists of rows and columns, each of which describes a particular aspect or part of an object in the

database to the rdb file (the write method is bgsave) # If you comment out the following three commands, you are not allowed to use rdbsave 900 1 #300 s. At least one key has changed. save 10000 10 #10000 S. At least 10 keys have changed. save 60 # There are at least keys after 60 s. key changed # When the rdb process in the background exports a snapshot (part o

loss, you can also retrieve or lose some of the data from the traditional database, so you can choose the RDB persistence mode. Let's talk about the configuration file policy again. In fact, it works the same as the bgsave command for persistence. This is the configuration fileDefault policy, The relationship between them is or, every900Seconds, at least changed during this periodOneKey value for snapshot

the system is willing to sacrifice some performance in exchange for higher cache consistency (AOF), or is willing to write frequently, do not enable backup in exchange for higher performance, when manually run save, then do Backup (RDB). The RDB is a bit more eventually consistent.The difference between the RDB and AOF persistence for Redis Performance compariso

Redis persistence-RDB and Redis persistence-RDBRedis provides a RDB persistence mechanism, that is, to write data set snapshots in the memory to the disk at a specified interval.Advantages of RDB:1. In this way, there is only one file to back up the Redis database. Once the system encounters a catastrophic fault, it ca

rewrite. Once the new AOF file is created, Redis switches from the old AOF file to the new AOF file and begins appending to the new AOF file. The AOF file preserves all write operations performed on the database in an orderly manner, and these writes are saved in the format of the Redis protocol, so the contents of the AOF file are easily readable and parsing (parse) is easy. The export AOF file is also very simple: for example, if you accidentally e

AOF file is created, Redis switches from the old AOF file to the new AOF file and begins appending to the new AOF file. The AOF file preserves all write operations performed on the database in an orderly manner, and these writes are saved in the format of the Redis protocol, so the contents of the AOF file are easily readable and parsing (parse) is easy. The export AOF file is also very simple: for example, if you accidentally executed the Flushall c

switches from the old AOF file to the new AOF file and begins appending to the new AOF file. The AOF file preserves all write operations performed on the database in an orderly manner, and these writes are saved in the format of the Redis protocol, so the contents of the AOF file are easily readable and parsing (parse) is easy. The export AOF file is also very simple: for example, if you accidentally executed the Flushall command, but as long as the

users use AOF persistence only, but we do not recommend this approach: because the scheduled generation of an Rdb snapshot (snapshot) is very convenient for database backups, and the RDB recovers the data set faster than the AOF recovery, the use of an RDB also avoids the previously mentioned The bug of the AOF progra

Note: This article mainly refers to the design and implementation of Redis1. Two persistent modes of Redis Rdb Execution mechanism: snapshot, storing the binary form of key-value in databases directly in the Rdb file Advantage: High performance (because it is a snapshot, and the execution frequency is lower than aof, and the Rdb file is

In the case of running, Redis saves data in memory as a structure, and in order for data to be available after Redis restarts, Redis provides two ways to persist the RDB and aof, this article explains how RDB persistence works At run time, Redis stores the in-memory database to disk as a snapshot, and reads the RDB fil

8. Basic Redis commands-management-persistence-RDB, redis-rdb1. Redis supports two methods of Persistence: RDB and AOF. It can be used separately or in combination.2. The rdb a and RDB modes are the default persistence methods adopted by Redis, which are completed through snapshots. When certain conditions are met, Red

Redis persistence-RDB working principle and problems, redis-rdb Working principle of Redis persistent RDB mode: Redis persistent RDB mode. Redis uses the copy on write mechanism of the fork command. When a snapshot is generated, the current process is completely copied, fork generates a sub-process, and then all the

Tags: pen export signal few minutes consistency avoid selecting out large numberThe persistence mechanism provided by Redis Redis is a high-performance database that you can choose to persist or not persist. If you want to save, there will be data synchronization problems, you can simply think of a piece of data in memory (snapshot), a piece of data on disk, Redis provides a very flexible persistence method: Redis provides an

Tags: using client call int log how for system call Val First, RDB Redis DataBase The RDB persistence performs point-in-time snapshots of your dataset at specified intervals. Writes a snapshot of an in-memory dataset to disk at a specified time interval, which is the jargon-snapshot snapshot, which restores the snapshot file directly to memory. Second, how is the

the new AOF file is created, Redis switches from the old AOF file to the new AOF file and begins appending to the new AOF file. The AOF file preserves all write operations performed on the database in an orderly manner, and these writes are saved in the format of the Redis protocol, so the contents of the AOF file are easily readable and parsing (parse) is easy. The export AOF file is also very simple: for example, if you accidentally executed the Fl

Although Redis is a memory-based storage system, it natively supports the persistence of in-memory data and provides two main persistence strategies: The Rdb snapshot and the AoF log describe the two different persistence strategies, respectively: 1. Redis's RDB snapshot Redis support will be Snapshot of the previous data into a data file persistence mechanism, the RDB