diff --git a/core/core.api.php b/core/core.api.php
index 23be3cf976..d86cafb2e6 100644
--- a/core/core.api.php
+++ b/core/core.api.php
@@ -612,11 +612,23 @@
  *  $settings['database_cache_max_rows']['default'] = 50000;
  * @endcode
  *
- * Or per bin (in this case removing the maximum):
+ * Or per bin (in this case we all infinite entries):
  * @code
  *  $settings['database_cache_max_rows']['bins']['dynamic_page_cache'] = -1;
  * @endcode
  *
+ * For monitoring reasons it might be useful to figure out the amount of data
+ * stored in tables. The following SQL snippet can be used for that:
+ * @code
+ * SELECT table_name AS `Table`, TABLE_ROWS as 'Num. of Rows',
+ * round(((data_length + index_length) / 1024 / 1024), 2) `Size in MB`  FROM
+ * information_schema.TABLES where table_schema = '***DATABASE_NAME***' and
+ * table_name LIKE 'cache_%'  ORDER BY (data_length + index_length) DESC
+ * limit 10;
+ * @encode
+ *
+ * @see \Drupal\Core\Cache\DatabaseBackend
+ *
  * Finally, you can chain multiple cache backends together, see
  * \Drupal\Core\Cache\ChainedFastBackend and \Drupal\Core\Cache\BackendChain.
  *
diff --git a/core/lib/Drupal/Core/Cache/DatabaseBackend.php b/core/lib/Drupal/Core/Cache/DatabaseBackend.php
index 7860ed03fb..6b99a14ec5 100644
--- a/core/lib/Drupal/Core/Cache/DatabaseBackend.php
+++ b/core/lib/Drupal/Core/Cache/DatabaseBackend.php
@@ -18,6 +18,11 @@ class DatabaseBackend implements CacheBackendInterface {
 
   /**
    * The default maximum number of rows that this cache bin table can store.
+   *
+   * This maximum is introduced to ensure that the database is not filled with
+   * hundred of thousand of cache entries with gigabytes in size.
+   *
+   * @see Read more how to change it at the cache paragraph in core.api.php.
    */
   const DEFAULT_MAX_ROWS = 5000;