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Redis transactions allow the execution of a group of commands in a single step. Following are the two properties of Transactions.
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All commands in a transaction are sequentially executed as a single isolated operation. It is not possible that a request issued by another client is served in the middle of the execution of a Redis transaction.
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Redis transaction is also atomic. Atomic means either all of the commands or none are processed.
Sample
Redis transaction is initiated by command MULTI 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.
redis 127.0.0.1:6379> MULTI OK List of commands here redis 127.0.0.1:6379> EXEC
Example
Following example explains how Redis transaction can be initiated and executed.
redis 127.0.0.1:6379> MULTI OK redis 127.0.0.1:6379> SET tutorial redis QUEUED redis 127.0.0.1:6379> GET tutorial 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 table shows some basic commands related to Redis transactions.
Sr.No | Command & Description |
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1 | DISCARD
Discards all commands issued after MULTI |
2 | EXEC
Executes all commands issued after MULTI |
3 | MULTI
Marks the start of a transaction block |
4 | UNWATCH
Forgets about all watched keys |
5 | WATCH key [key …]
Watches the given keys to determine the execution of the MULTI/EXEC block |
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