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This command controls the tracking of the keys in the next command executed
by the connection, when tracking is enabled in `OPTIN` or `OPTOUT` mode.
Please check the
[client side caching documentation](/topics/client-side-caching) for
background information.
When tracking is enabled Redis, using the `CLIENT TRACKING` command, it is
possible to specify the `OPTIN` or `OPTOUT` options, so that keys
in read only commands are not automatically remembered by the server to
be invalidated later. When we are in `OPTIN` mode, we can enable the
tracking of the keys in the next command by calling `CLIENT CACHING yes`
immediately before it. Similarly when we are in `OPTOUT` mode, and keys
are normally tracked, we can avoid the keys in the next command to be
tracked using `CLIENT CACHING no`.
Basically the command sets a state in the connection, that is valid only
for the next command execution, that will modify the behavior of client
tracking.
@return
@simple-string-reply: `OK` or an error if the argument is not yes or no.
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