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Document new optimistic locking commands in Redis 8.4 #2902

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dwdougherty merged 2 commits into from
Mar 18, 2026
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Document new optimistic locking commands in Redis 8.4 #2902

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Document new optimistic locking commands in Redis 8.4
LiorKogan Mar 18, 2026
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Update content/develop/using-commands/transactions.md
dwdougherty Mar 18, 2026
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5 changes: 5 additions & 0 deletions content/develop/using-commands/transactions.md
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Expand Up @@ -218,6 +218,11 @@ new race. This form of locking is called _optimistic locking_.
In many use cases, multiple clients will be accessing different keys,
so collisions are unlikely – usually there's no need to repeat the operation.

Starting with version 8.4, Redis offers new atomic compare-and-set and compare-and-delete commands for string keys.
A client can use a single ([`SET`]({{< relref "/commands/set" >}}) command with the `IFEQ`/`IFNE`/`IFDEQ`/`IFDNE` options to atomically update a string key only if its value has not changed since it was fetched.
This is much simpler and faster.
Similarly, a client can use a single `[`DELEX`]({{< relref "/commands/delex" >}})` command for compare-and-delete: atomically deleting a string key if its value hasn't changed since it was fetched.

## WATCH explained

So what is [`WATCH`]({{< relref "/commands/watch" >}}) really about? It is a command that will
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