> ## Documentation Index
> Fetch the complete documentation index at: https://docs.activeviam.com/llms.txt
> Use this file to discover all available pages before exploring further.

# ehcache-simm.xml

## File purpose

The **ehcache-simm.xml** file maintains the frequently queried parameter values in the cache to retrieve them faster during query time.

## File location

The file is located in the folder **simm-starter\src\main\resources**.

## File values

| Element       | Attribute | Value                  | Description                                                                                                     |
| :------------ | :-------- | :--------------------- | --------------------------------------------------------------------------------------------------------------- |
| \<cache>      | alias     | `DatastoreLookupCache` | The DatastoreLookupCache cache stores the datastore lookup values to reduce the response time at query runtime. |
| \<key-type>   |           | `java.lang.Object`     | The type of the key in the cache.                                                                               |
| \<value-type> |           | `java.util.Optional`   | The type of the value in the cache.                                                                             |
| \<expiry>     |           |                        | Specifies how long the cache lives.                                                                             |
| \<ttl>        | unit      | `minutes`              | The unit of time.                                                                                               |
| \<resources>  |           |                        | Properties to set up additional resources.                                                                      |
| \<heap>       | unit      | `MB`                   | The unit maximum memory heap for the cache.                                                                     |
| \<cache>      | alias     | `VectorExpandCache`    | The VectorExpandCache cache stores the vectors to reduce the response time at query runtime.                    |
| \<key-type>   |           | `java.lang.Integer`    | The type of the key in the cache.                                                                               |
| \<value-type> |           | `java.util.Optional`   | The type of the value in the cache.                                                                             |
| \<expiry>     |           |                        | Properties to set up how long the cache lives.                                                                  |
| \<ttl>        | unit      | `minutes`              | The unit of the time.                                                                                           |
| \<resources>  |           |                        | Properties to set up additional resources.                                                                      |
| \<heap>       | unit      | `MB`                   | The unit maximum memory heap for the cache.                                                                     |