SETCLOCK
requests,
le
accesses
and
frequen
t
op erating
system
activit y
suc
h
as
con
text
switches.
Results
of
the
;CANCEL
P
arameter
An
y
time
during
an
on-going
correction,
issuing
this
command
with
the
;CANCEL
parameter
will
immediately
set
the
correction
to
zero
and
cause
the
system
clo
c
k
to
resume
its
normal
pace.
An
y
previous
correction
will
remain.
When
this
option
is
used,
the
system
will
rep ort
the
amoun
t
of
correction
whic
h
w
as
cancelled.
How
a
System
Time
Change
Aects
Accoun
ting
Information
Changing
the
system
time,
ev
en
gradually
,
may
cause
accoun
ting
CONNECT-MINUTES
to
b e
distorted.
An
y
one
logging
on
b efore
the
c
hange
and
then
logging
o
after
the
c
hange
is
completed
will
ha
v
e
their
accoun
ting
CONNECT-MINUTES
data
distorted;
if
the
time
c
hange
is
forward,
CONNECT-MINUTES
will
b e
increased
b
y
the
amoun
t
of
the
time
c
hange,
and
if
the
time
c
hange
is
bac
kw
ard,
CONNECT-MINUTES
will
b e
decreased
b
y
the
amoun
t
of
the
time
c
hange.
Dangers
in
Using
the
;NOW
P
arameter
The
;NOW
parameter
p ermits
immediate
forward
or
bac
kw
ard
time
c
hanges.
Ho
w
ev
er,
sev
eral
dangerous
situations
can
o ccur:
An
y
applications
whic
h
rely
on
the
forward
progression
of
time
may
give
inconsisten
t
results
if
the
time
is
immediately
set
bac
kw
ards.
Suc
h
applications
include
the
pro cessing
of
timestamp
ed
transactions
in
whic
h
the
sequence
of
those
transactions
is
imp ortant.
In
order
to
reco
v
er
data
in
case
of
an
unexpected
hardw
are
or
softw
are
failure,
some
applications
require
that
the
system
time
m
ust
nev
er
seem
to
go
bac
kw
ards.
F
or
instance,
some
applications
log
transactions
to
a
circular
le.
These
transactions
are
timestamp
ed,
and
if
the
transactions
m
ust
b e
reco
v
ered,
the
reco
v
ery
program
determines
the
end
of
data
b
y
lo
oking
for
timestamps
whic
h
are
out
of
sequence.
If
the
system
time
is
set
bac
kw
ards
immediately
,
transactions
whic
h
o ccur
after
the
time
c
hange
may
not
b e
reco
v
ered.
Therefore,
do
not
set
the
time
bac
kw
ards
using
the
;NOW
option
if
there
are
applications
whic
h
log
their
transactions
using
timestamps.
Accoun
ting
CPU-SECONDS
data
may
b e
distorted.
The
user
whose
pro cess
w
as
active
during
an
immediate
forward
or
bac
kw
ard
c
hange
might
seem
to
2-242
MPE/iX
Commands

---

...

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