Retrieves the number of hidden records in the cluster.
In OrientDB it's possible to remove a record from queries without deleting the data from the cluster. This is done by setting a 'tombstone' on the record. You may find this useful in cases where you would like to implement a trashcan safety features, where deleted records are hidden for a time before they're permanently removed from the database. Using this method, you can retrieve the number of tombstone records in the cluster.
This method returns a
long value, which indicates the number of hidden records in the cluster.