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Sorted Sets Zrevrangebyscore Hashes Hget Hyperloglog Pfcount Strings Msetnx Redis Partitioning Connection Select Redis Geo Lists Lset Server Config Resetstat Sets Sismember Lists Brpop Strings Getbit Keys Randomkey Strings Setex Server Client Getname Pub Sub Punsubscribe Strings Incrby Sorted Sets Zincrby Keys Dump Sets Spop Strings Get Strings Psetex Lists Lrange Redis Sets Server Command Getkeys Strings Decr Strings Incr Redis Transactions Lists Lpop Sorted Sets Zrank Keys Pexpireat Scripting Script Load Sorted Sets Zunionstore Scripting Script Exists Hashes Hexists Keys Expireat Sets Sinterstore Keys Del Keys Move Sorted Sets Zscore Lists Llen Server Info Server Debug Object Sorted Sets Zremrangebylex Server Config Rewrite Sets Sdiffstore Pub Sub Subscribe Redis Keys Server Client Pause Strings Strlen Redis Backup Keys Ttl Sorted Sets Zrange Redis Strings Sets Sdiff Hashes Hmget Sorted Sets Zcard Connection Quit Strings Setrange Server Flushall Keys Renamenx Server Config Set Connection Ping Lists Brpoplpush Sets Sinter Server Flushdb Redis Intro Server Client List Keys Type Server Sync Keys Pexpire Sorted Sets Zremrangebyscore Keys Rename Java Environment Setup Transactions Discard Redis Lists Server Client Setname Server Role Hashes Hsetnx Redis Sorted Sets Keys Persist Transactions Watch Lists Ltrim Server Client Kill Strings Getset Sets Smove Lists Lpushx Sorted Sets Zscan Connection Echo Strings Mget Sorted Sets Zlexcount Redis Hyperloglog Sorted Sets Zadd Sets Srandmember Redis Pipelining Transactions Multi Hashes Hdel Hashes Hkeys Pub Sub Psubscribe Keys Exists Sorted Sets Zremrangebyrank Sorted Sets Zrevrange Lists Rpushx Server Debug Segfault Hashes Hvals Server Bgrewriteaof Sets Sscan Strings Mset Keys Pttl Connection Auth Strings Incrbyfloat Keys Expire Sorted Sets Zrangebylex Hashes Hmset Sets Scard Sorted Sets Zrevrank Strings Decrby Server Lastsave Server Cluster Slots Redis Commands Redis Install Server Save Server Config Get Redis Hashes Keys Keys Hashes Hincrbyfloat Redis Data Types Strings Setbit Redis Benchmarks Hyperloglog Pfmerge Sorted Sets Zrem Transactions Exec Server Command Info Pub Sub Unsubscribe Transactions Unwatch Strings Getrange Hashes Hincrby Sorted Sets Zrangebyscore Redis Pub Sub Sets Smembers Lists Lindex Scripting Eval Sets Sadd Hyperloglog Pfadd Lists Lrem Redis Tutorial Server Slowlog Lists Blpop Pub Sub Publish Lists Linsert Scripting Evalsha Sets Sunionstore Redis Conf Server Command Count Sorted Sets Zcount Server Monitor Sorted Sets Zinterstore Server Command Server Dbsize Hashes Hlen Scripting Script Flush Server Slaveof Keys Scan Redis Connection Hashes Hset Redis Server Redis Scripting Lists Rpop Redis Client Connection Scripting Script Kill Redis Security Server Time Strings Append Redis Java Server Showlog Server Shutdown Lists Rpush Lists Rpoplpush Lists Lpush Server Bgsave Sets Srem Strings Setnx Redis Stream Hashes Hscan Redis Php Pub Sub Pubsub Hashes Hgetall Strings Set Sets Sunion
❮ Strings Incr Lists Lpop ❯

Redis Transactions

Redis transactions allow the execution of multiple commands in a single step, with the following three important guarantees:

A transaction goes through the following three phases from start to execution:

Example

Below is an example of a transaction. It starts with MULTI, queues multiple commands into the transaction, and finally triggers the transaction with the EXEC command to execute all commands in the transaction:

redis 127.0.0.1:6379> MULTI
OK

redis 127.0.0.1:6379> SET book-name "Mastering C++ in 21 days"
QUEUED

redis 127.0.0.1:6379> GET book-name
QUEUED

redis 127.0.0.1:6379> SADD tag "C++" "Programming" "Mastering Series"
QUEUED

redis 127.0.0.1:6379> SMEMBERS tag
QUEUED

redis 127.0.0.1:6379> EXEC
1) OK
2) "Mastering C++ in 21 days"
3) (integer) 3
4) 1) "Mastering Series"
   2) "C++"
   3) "Programming"

The execution of individual Redis commands is atomic, but Redis does not add any mechanisms to maintain atomicity in transactions, so the execution of Redis transactions is not atomic.

A transaction can be understood as a packaged batch execution script, but the batch instructions are not atomic operations. The failure of an intermediate command does not cause a rollback of previously executed commands, nor does it prevent subsequent commands from executing.

>

This is the official explanation from the Redis docs:

It's important to note that even when a command fails, all other commands in the queue are processed – Redis will not stop the processing of commands.

For example:

redis 127.0.0.1:7000> multi
OK
redis 127.0.0.1:7000> set a aaa
QUEUED
redis 127.0.0.1:7000> set b bbb
QUEUED
redis 127.0.0.1:7000> set c ccc
QUEUED
redis 127.0.0.1:7000> exec
1) OK
2) OK
3) OK

If the command set b bbb fails, set a will not be rolled back, and set c will continue to execute.

Redis Transaction Commands

The table below lists the Redis transaction-related commands:

Number Command and Description
1 DISCARD <br>Discard the transaction and abort the execution of all commands within the transaction block.
2 EXEC <br>Execute all commands within the transaction block.
3 MULTI <br>Mark the beginning of a transaction block.
4 UNWATCH <br>Unwatch all keys monitored by the WATCH command.
5 WATCH key [key ...] <br>Monitor one (or multiple) keys. If the key(s) are modified by another command before the transaction is executed, the transaction will be interrupted.
❮ Strings Incr Lists Lpop ❯