From: "Pavel Cisar"

> While you can get the exact measure of garbage, you can get approximate
> numbers from gstat: use -a and -r gstat switches. IFAIK -r switch is not
> available through services API, so use really the command-line gstat.

I think that it is already available, this is new in FB1.5RC7 ibase.h:

/*****************************************
* Parameters for isc_info_svc_db_stats *
*****************************************/
#define isc_spb_sts_record_versions 0x20


Ivan