Using Insight Zeppelin you can create some reports with the following example SQL queries:
Note: Insight Zeppelin comes with a note and example reports, see Insight Zeppelin reports and notes.
The number of documents in the repository
Select count(*) as Documents from alfresco where TYPE='cm:content'
The amount of storage used in the repository**
Select sum(`cm:content.size`) as `Storage Used (bytes)` from alfresco
The amount of content created in the last 60 days
Select cm_created_day, count(*) from alfresco where cm_created >= 'NOW/DAY-60DAYS' group by cm_created_day
The amount of new documents created by what user and for which site
Select SITE, cm_creator, count(*) as total from alfresco where NOT cm_creator = 'System' group by SITE, cm_creator order by total desc