Manage Distinct Value Caches with InfluxDB 3 Explorer

Use InfluxDB 3 Explorer to manage Distinct Value Caches (DVCs) in an InfluxDB 3 instance or cluster. To navigate to the Distinct Value Cache management page:

1. In the left navigation bar, select Configure > Caches.
2. Select the Distinct Value Caches tab.

• View Distinct Value Caches
• Create a Distinct Value Cache
• Query a Distinct Value Cache
• Delete a Distinct Value Cache

View Distinct Value Caches

To view DVCs associated with a database, navigate to the Distinct Value Cache management page and select the database from the Select Database dropdown menu. The page lists all DVCs associated with the selected database.

Create a Distinct Value Cache

On the Distinct Value Cache management page:

1. Click + Create Cache.

2. Provide the following:

   • Cache name: A unique name for the cache.

   • Database: The database the cache is associated with.

   • Table: The target table for the cache. As data is written to the table, it populates the cache. You must select a database before you can select a table.

   • Column names: Select columns to cache distinct values from. These are typically InfluxDB tags, but you can also use fields. combinations to cache. Once this limit is exceeded, InfluxDB drops the oldest cached distinct values.

   • Max Age: Specify the maximum age of cached values as a duration in humantime form. The default is 24h.

     [!Note] Higher cardinality (more distinct values) in a DVC increases memory usage.

3. Click Create.

Query a Distinct Value Cache

Use the Data Explorer to query a DVC:

1. In the left navigation, select Query Data > Data Explorer.
2. Select the database you want to query from the Select database dropdown menu.
3. Click the <strong class="icon-chevron-down"></strong> icon next to the table associated with the DVC you want to query to expand the table. Tables with DVCs have a <span class="badge dvc">DVC</span> badge below the <strong class="icon-chevron-down"></strong> icon.
4. Under the Caches section of the expanded table, DVCs are identified by the <span class="badge dvc">DVC</span> badge. Click the name of the DVC to generate a SQL query that queries everything from the DVC. You can also expand the DVC and select specific columns to query.
5. Click Run Query to execute the query and return results from the cache.

Delete a Distinct Value Cache

On the Distinct Value Cache management page:

1. Select the database associated with the cache you want to delete from the Select Database dropdown menu.
2. In the Active Caches table, click the {{% icon "trash" %}} icon next to the cache you want to delete.