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(gdbm.info)Sync

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Database Synchronization
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   If your database was opened with the GDBM_FAST flag, `gdbm' does not
wait for writes to the disk to complete before continuing.  This allows
faster writing of databases at the risk of having a corrupted database
if the application terminates in an abnormal fashion.  The following
function allows the programmer to make sure the disk version of the
database has been completely updated with all changes to the current
time.

     gdbm_sync(dbf);

   The parameter is:

GDBM_FILE dbf
     The pointer returned by `gdbm_open'.

   This would usually be called after a complete set of changes have
been made to the database and before some long waiting time.
`gdbm_close' automatically calls the equivalent of `gdbm_sync' so no
call is needed if the database is to be closed immediately after the
set of changes have been made.