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da questo dispositivo ha anche altre istruzioni :
Facilità d'uso
Log
Names
and
Numbers
Log
les
are
referred
to
in
dieren
t
w
a
ys,
dep ending
on
the
op eration
y
ou
are
attempting
to
p erform.
In
some
instances,
y
ou
m
ust
refer
to
a
log
b
y
its
le
name.
In
other
cases,
y
ou
refer
to
the
log
b
y
its
iden
tier
n
um
b er
.
Log
File
Names
Use
a
le
name
when
y
ou
add
a
new
log
with
the
ADDLOG
command,
when
y
ou
mov
e
it
to
a
new
lo
cation
with
MO
VELOG,
or
when
y
ou
m
ust
rescue
it
with
RESCUELOG.
The
le
name
is
an
MPE
le
name.
Identifier
Numbers
Use
the
iden
tier
n
um
b er
when
y
ou
purge
a
log
le
or
when
(in
arc
hiv
e
mo
de
only)
y
ou
store
it.
Eac
h
log
le
y
ou
add
is
given
a
sp ecic
iden
tier
n
um
b er;
in
the
case
of
dual
logging,
the
same
iden
tier
n
um
b er
refers
to
b oth
les
together.
Sequence
Numbers
ALLBASE/SQL
also
k
eeps
track
of
m
ultiple
log
les
through
se
quenc
e
numb
ers
,
whic
h
are
stored
along
with
the
ph
ysical
le
names
in
the
DBECon
le.
Sequence
n
um
b ers
are
also
written
on
to
the
tap
e
at
the
time
y
ou
issue
a
STORELOG
command
(describ ed
in
a
later
section).
In
the
case
of
dual
logging,
the
same
sequence
n
um
b er
refers
to
b oth
les
together.
Y
ou
nev
er
allo
cate
sequence
n
um
b ers
y
ourself.
They
are
used
in
ternally
b
y
ALLBASE/SQL
to
k
eep
track
of
the
order
in
whic
h
les
are
applied
during
the
reco
v
ery
pro cess.
If
y
ou
attempt
to
reco
v
er
a
log
le
that
has
the
wrong
sequence
n
um
b er,
y
ou
receiv
e
an
error
message.
Sequence
n
um
b ers
con
tinue
incremen
ting
eac
h
time
y
ou
switch
in
to
a
new
log
le.
As
an
example,
supp ose
the
DBEn
vironmen
t
is
congured
for
single
logging
in
arc
hiv
e
mo
de.
Log
1
has
the
lename
DBEL
o
g1
,
and
initially
it
receiv
es
log
iden
tier
n
um
b er
1
and
sequence
n
um
b er
1.
Log
2
has
the
lename
DBEL
o
g2
,
and
initially
it
receiv
es
log
iden
tier
n
um
b er
2,
and
sequence
n
um
b er
2.
When
Log
1
runs
out
of
space,
ALLBASE/SQL
switches
to
Log
2.
After
Log
1
has
b een
bac
k
ed
up
and
when
it
no
longer
has
active
transactions
in
it,
it
b ecomes
a
v
ailable
for
reuse.
Then,
when
ALLBASE/SQL
switches
o
v
er
to
Log
1
again,
it
receiv
es
sequence
n
um
b er
3,
although
it
still
has
iden
tier
n
um
b er
1,
and
it
is
still
called
DBEL
o
g1
.
Using
Nonarchiv
e
Logs
A
nonarc
hiv
e
log
b eha
v
es
like
a
circular
leset.
A
circular
leset
is
a
group
of
les
in
whic
h
the
rst
one
is
o
v
erwritten
when
the
last
one
is
full.
If
a
nonarc
hiv
e
log
le
b ecomes
full,
ALLBASE/SQL
rst
issues
a
c
hec
kp oint
in
an
eort
to
reclaim
the
le
space
taken
up
b
y
transactions
that
ha
v
e
already
b een
committed.
(A
c
hec
kp oint
is
an
ev
en
t
that
ushes
data
and
log
buer
con
ten
ts
to
disk,
and
reclaims
nonarc
hiv
e
log
le
space
for
reuse.)
If
a
c
hec
kp oint
do es
not
reclaim
enough
space
for
the
curren
t
transaction,
ALLBASE/SQL
attempts
to
switch
to
the
next
le
(if
it
is
a
v
ailable).
A
log
le
is
considered
a
v
ailable
if
it
do es
not
con
tain
an
y
log
records
for
transactions
active
at
the
last
c
hec
kp oint.
If
the
log
is
still
full,
and
there
is
no
other
log
a
v
ailable
to
switch
in
to,
a
LOG
FULL
condition
o ccurs,
and
the
transaction
is
rolled
bac
k.
6-4
Backup
and
Reco
v
ery
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