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Update hash field expiration details for Redis 8.0 #2280

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Update hash field expiration details for Redis 8.0 #2280

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9 changes: 7 additions & 2 deletions content/develop/data-types/hashes.md
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Expand Up @@ -100,7 +100,7 @@ See the [complete list of hash commands]({{< relref "/commands/" >}}?group=hash)

## Field expiration

New in Redis Open Source 7.4 is the ability to specify an expiration time or a time-to-live (TTL) value for individual hash fields.
In Redis 7.4 we introduced the ability to specify an expiration time or a time-to-live (TTL) value for individual hash fields.
This capability is comparable to [key expiration]({{< relref "/develop/using-commands/keyspace#key-expiration" >}}) and includes a number of similar commands.

Use the following commands to set either an exact expiration time or a TTL value for specific fields:
Expand All @@ -123,6 +123,11 @@ Use the following command to remove the expiration of specific fields:

* [`HPERSIST`]({{< relref "/commands/hpersist" >}}): remove the expiration.

In Redis 8.0 we introduced the following commands:

* [`HGETEX`]({{< relref "/commands/HGETEX" >}}): Get the value of one or more fields of a given hash key and optionally set their expiration time or time-to-live (TTL).
* [`HSETEX`]({{< relref "/commands/HSETEX" >}}): Set the value of one or more fields of a given hash key and optionally set their expiration time or time-to-live (TTL).

### Common field expiration use cases

1. **Event Tracking**: Use a hash key to store events from the last hour. Set each event's TTL to one hour. Use `HLEN` to count events from the past hour.
Expand Down Expand Up @@ -201,4 +206,4 @@ In practice, your hashes are limited only by the overall memory on the VMs hosti
## Learn more

* [Redis Hashes Explained](https://www.youtube.com/watch?v=-KdITaRkQ-U) is a short, comprehensive video explainer covering Redis hashes.
* [Redis University's RU101](https://university.redis.com/courses/ru101/) covers Redis hashes in detail.
* [Redis University's RU101](https://university.redis.com/courses/ru101/) covers Redis hashes in detail.