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

# Cache

> Internal caching backed by MySQL.

BlogLoom implements caching inside the application, storing cache data in the MySQL table `cache_entry`. No external cache service such as Redis is required.

## How it works

| Item          | Description                                                                |
| ------------- | -------------------------------------------------------------------------- |
| Storage       | MySQL table `cache_entry`                                                  |
| Access        | Read and written by the backend cache module, transparent to business code |
| Extra service | No Redis or other cache middleware to deploy                               |

## Usage

* Caches are persisted together with the database; backing up the database includes cache data.
* Hot data such as site configuration is cached; clear the cache after changes for them to take effect.
* Clearing the cache does not affect business data such as posts and comments.

## Operations

* No dedicated port or password is needed for caching.
* Monitor table growth together with the database.
* When debugging cache issues, check that the database connection is healthy.

## Next steps

* [MySQL](/v1/en/integration/data/mysql)
* [Configuration](/v1/en/deploy/configuration)