Run datastore garbage collector on magnolia project via groovy shell

datastoregc.groovy

import info.magnolia.context.MgnlContext

// fill "repositories" list with one workspace for each repository defined in your repositories.xml jackrabbit configuration file
// (if you have different repositories using the same datastore modify this script according to http://wiki.apache.org/jackrabbit/DataStore#line-212)
def repositories = ["website", "media"]

def removedDataStoreEntries = 0
repositories.each() { repo ->
  def session = MgnlContext.getHierarchyManager(repo).getWorkspace().getSession()
  def gc = session.createDataStoreGarbageCollector()
  try {
    gc.mark()
    removedDataStoreEntries += gc.sweep()
  }
  finally {
    gc.close()
  }
}
return removedDataStoreEntries