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Facilità d'uso
7
Protecting
the
File
and
Its
Data
A
tten
tion
m
ust
b e
paid
to
protecting
a
KSAM
XL
le's
data.
Chec
k
an
in
trinsic's
status
after
a
call
to
nd
information
ab out
a
failed
routine.
The
FCHECK
and
FERRMSG
in
trinsics
pro
vide
error
co des
and
messages
after
an
in
trinsic
call
has
failed.
V
arious
in
trinsics
con
trol
le
access
when
a
le
is
shared
b
y
more
than
one
pro cess.
Lo c
king
and
unlo c
king
the
le
con
trols
access
to
a
shared
le
during
critical
mo
dication
op erations.
The
item
n
um
b ers
2
and
6
of
the
FCONTROL
in
trinsic
ensure
that
data
is
written
to
the
disk
b efore
pro cessing
is
allo w
ed
to
con
tinue.
This
protects
the
data
from
system
and
softw
are
ab orts
that
may
o ccur
b et
w
een
the
time
that
data
is
written
to
the
transaction
log
and
the
time
that
it
is
actually
written
to
the
disk.
T
ransaction
managemen
t
pro
vides
automatic
reco
v
ery
from
system
and
softw
are
ab orts.
Regular
maintenance
and
le
bac
kups
are
needed
for
data
protection
against
hardw
are
failures
or
improp
er
pro cessing.
If
index
corruption
exists,
les
can
b e
restored
quic
kly
through
the
F
COPY
facilit
y
.
When
a
le
in
trinsic
returns
a
condition
co de
indicating
that
a
Checking
Error
ph
ysical
input
or
output
error
has
o ccurred,
additional
details
can
Information
b e
obtained
b
y
calling
the
FCHECK
in
trinsic.
The
parameters
of
the
FCHECK
in
trinsic
can
b e
designated
to
return
the
following
error
information:
The
error
co de
that
iden
ties
the
t
yp e
of
error
that
o ccurred.
The
transmission
log
v
alue
that
sp ecies
the
n
um
b er
of
w
ords
not
read
or
written
b efore
the
input
or
output
error.
The
relativ e
n
um
b er
of
the
blo
c
k
in
v
olv
ed
with
the
error.
The
n
um
b er
of
logical
records
that
w
ere
in
the
bad
blo
c
k
at
the
time
of
the
error.
This
error
information
can
b e
expanded
to
include
a
description
of
the
error
b
y
calling
the
FERRMSG
in
trinsic.
This
in
trinsic
uses
the
error
co de
returned
b
y
the
FCHECK
in
trinsic.
By
supplying
the
returned
FCHECK
error
co de
and
dening
a
message
buer
in
the
FERRMSG
in
trinsic
call
,
a
corresp onding
message
can
b e
display
ed
from
y
our
program.
The
error
co de
returned
b
y
FCHECK
and
its
Protecting
the
File
and
Its
Data
7-1
... Questo manuale è adatto anche per i modelli :
Software - MPE/iX 6.5 Operating System (774.39 kb)