> Is this possible?

http://www.firebirdsql.org/file/documentation/reference_manuals/user_manuals/html/gfix-cmdline.html

Sure.

see parameter: -housekeeping   set sweep interval <n>

usage: gfix [options] <database>
plausible options are:
         -activate       activate shadow file for database usage
         -attach         shutdown new database attachments
         -buffers        set page buffers <n>
         -commit         commit transaction <tr / all>
         -cache          shutdown cache manager
         -full           validate record fragments (-v)
         -force          force database shutdown
         -fetch_password fetch_password from file
         -housekeeping   set sweep interval <n>
         -ignore         ignore checksum errors
         -kill           kill all unavailable shadow files
         -list           show limbo transactions
         -mend           prepare corrupt database for backup
         -mode           read_only or read_write
         -no_update      read-only validation (-v)
         -online         database online <single / multi / normal>
         -prompt         prompt for commit/rollback (-l)
         -password       default password
         -rollback       rollback transaction <tr / all>
         -sql_dialect    set database dialect n
         -sweep          force garbage collection
         -shut           shutdown <full / single / multi>
         -two_phase      perform automated two-phase recovery
         -tran           shutdown transaction startup
         -use            use full or reserve space for versions
         -user           default user name
         -validate       validate database structure
         -write          write synchronously or asynchronously
         -z              print software version number

http://www.firebirdsql.org/file/documentation/reference_manuals/user_manuals/html/gfix-housekeeping.html

Disabling Automatic Sweeping

If you set the sweep interval to zero then automatic sweeping will be 
disabled. This implies that there will be no automatic housekeeping done 
so your database performance will not suffer as a result of the 
processing requirements of the automatic sweep.


bye...
eMeL

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