Redis Transactions

Redis transaction is used to facilitates users to execute group of commands in a single step.

There are two properties of execution:

All commands in a transaction are sequentially executed as a single isolated operation. You can't issue a request by another client served in the middle of the execution of a Redis transaction.
Redis transaction is also atomic. Atomic means either all of the commands or none are processed.

Sample

In Redis, transaction is initiated by using "MULTI" command and then you need to pass a list of commands that should be executed in the transaction, after which the entire transaction is executed by "EXEC" command.

Example

Let's take an example to see how Redis transaction can be initiated and executed.

Example

redis 127.0.0.1:6379> MULTI
OK
redis 127.0.0.1:6379> EXEC
(empty list or set)
redis 127.0.0.1:6379> MULTI
OK
redis 127.0.0.1:6379> SET javatpoint redis
QUEUED
redis 127.0.0.1:6379> GET javatpoint
QUEUED
redis 127.0.0.1:6379> INCR visitors
QUEUED
redis 127.0.0.1:6379> EXEC
1) OK
2) "redis"
3) (integer) 1

Redis Transaction Commands

Following is a list of some basic commands of Redis transaction.

Index	Command	Description
1	DISCARD	It is used to discard all commands issued after MULTI
2	EXEC	It is used to execute all commands issued after MULTI
3	MULTI	It is used to mark the start of a transaction block
4	UNWATCH	It is used to forget about all watched keys
5	WATCH key [key ...]	It is used to watche the given keys to determine the execution of the MULTI/EXEC block