---
acl_categories:
- '@fast'
- '@transaction'
arguments:
- display_text: key
  key_spec_index: 0
  multiple: true
  name: key
  type: key
arity: -2
categories:
- docs
- develop
- stack
- oss
- rs
- rc
- oss
- kubernetes
- clients
command_flags:
- noscript
- loading
- stale
- fast
- allow_busy
complexity: O(1) for every key.
description: Monitors changes to keys to determine the execution of a transaction.
group: transactions
hidden: false
key_specs:
- RO: true
  begin_search:
    spec:
      index: 1
    type: index
  find_keys:
    spec:
      keystep: 1
      lastkey: -1
      limit: 0
    type: range
linkTitle: WATCH
railroad_diagram: /images/railroad/watch.svg
since: 2.2.0
summary: Monitors changes to keys to determine the execution of a transaction.
syntax_fmt: WATCH key [key ...]
title: WATCH
---
{{< note >}}
This command's behavior varies in clustered Redis environments. See the [multi-key operations]({{< relref "/develop/using-commands/multi-key-operations" >}}) page for more information.
{{< /note >}}


Marks the given keys to be watched for conditional execution of a
[transaction][tt].

[tt]: /develop/interact/transactions

## Redis Software and Redis Cloud compatibility

| Redis<br />Software | Redis<br />Cloud | <span style="min-width: 9em; display: table-cell">Notes</span> |
|:----------------------|:-----------------|:------|
| <span title="Supported">&#x2705; Standard</span><br /><span title="Supported"><nobr>&#x2705; Active-Active</nobr></span> | <span title="Supported">&#x2705; Standard</span><br /><span title="Supported"><nobr>&#x2705; Active-Active</nobr></span> |  |

## Return information

{{< multitabs id="watch-return-info" 
    tab1="RESP2" 
    tab2="RESP3" >}}

[Simple string reply](../../develop/reference/protocol-spec#simple-strings): `OK`.

-tab-sep-

[Simple string reply](../../develop/reference/protocol-spec#simple-strings): `OK`.

{{< /multitabs >}}