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Фрагмент инструкции
The
DBECon
le
con
tains
information
ab out
startup
parameters
for
the
DBEn
vironmen
t
and
its
logs.
ST
AR
T
DBE
NEW
also
creates
a
structure
within
the
DBEn
vironmen
t
kno
wn
as
a
system
catalog,
whic
h
is
a
set
of
information
ab out
all
the
databases
in
the
DBEn
vironmen
t.
In
T
urb oIMA
GE,
a
sc
hema
is
required
to
dene
a
database.
Most
Use
of
a
Schema
users
create
the
sc
hema
in
an
ASCI I
le.
Once
the
database
exists,
the
sc
hema
can
serv
e
as
a
record
of
its
con
ten
ts.
The
sc
hema
can
also
b e
used
to
create
the
same
database
structure
in
dieren
t
groups
and
accoun
ts
or
on
dieren
t
systems.
Y
ou
can
also
create
a
sc
hema
for
ALLBASE/SQL
b
y
en
tering
in
to
an
ASCI I
le
all
the
SQL
commands
needed
to
congure
the
DBEn
vironmen
t
and
create
all
the
ob
jects
in
it.
Y
ou
can
use
this
le
as
input
to
ISQL.
Ho
w
ev
er,
in
ALLBASE/SQL,
no
sc
hema
is
required;
all
that
is
necessary
to
congure
a
DBEn
vironmen
t
is
a
ST
AR
T
DBE
NEW
command
issued
through
ISQL
or
an
application
program.
In
T
urb oIMA
GE,
the
ro
ot
le,
whic
h
is
generated
b
y
DBSCHEMA
Root
File
v
ersus
from
the
sc
hema,
con
tains
securit
y
information
and
denitions
of
all
DBECon
File
and
the
data
sets
in
the
database,
together
with
the
name
of
the
database
System
Catalog
creator.
The
DBECon
le
in
ALLBASE/SQL
is
created
when
y
ou
issue
the
ST
AR
T
DBE
NEW
command.
The
DBECon
le,
whic
h
has
the
same
name
as
the
DBEn
vironmen
t,
con
tains
the
name
of
the
DBECreator
and
the
names
of
the
logs
asso
ciated
with
the
DBEn
vironmen
t.
It
also
indicates
startup
parameters,
suc
h
as
SINGLE
or
MUL
TI
user
mo
de,
and
others
(examples
are
sho
wn
in
the
section
\Examining
Startup
P
arameters
with
SQLUtil"
in
c
hapter
4).
In
ALLBASE/SQL,
structural
information
is
also
stored
in
ternally
in
a
set
of
system
tables
kno
wn
as
the
system
catalog.
This
is
like
an
in
ternal
sc
hema.
The
DBECon
le
do es
not
con
tain
the
names
of
tables
or
other
database
ob
jects;
these
are
stored
in
the
system
catalog.
Eac
h
data
set
in
a
T
urb oIMA
GE
database
o ccupies
a
separate
MPE
Data
Files
for
Data
sets
XL
le,
created
b
y
T
urb oIMA
GE
as
a
PRIV
le.
The
le
size
is
v
ersus
DBEFiles
for
determined
from
the
capacity
y
ou
indicate
for
the
data
set
in
the
T
ables
sc
hema.
In
ALLBASE/SQL,
y
ou
create
a
table
inside
a
DBEFileSet,
to
whic
h
y
ou
ha
v
e
added
one
or
more
DBEFiles.
These
DBEFiles
need
to
b e
large
enough
for
the
amoun
t
of
data
y
ou
need
to
store.
Instead
of
sp ecifying
a
capacity
,
y
ou
create
DBEFiles
of
whatev
er
size
is
needed.
DBEFiles
can
hold
data
and/or
indexes
for
more
than
one
table
at
a
time;
no
simple
corresp ondence
b et
w
een
tables
and
data
les
exists.
Y
ou
do
not
sp ecify
the
size
of
a
table
when
y
ou
create
it;
the
table
size
is
limited
only
b
y
the
capacity
of
y
our
system.
As
5-4
Comparing
ALLBASE/SQL
with
TurboIMA
GE
DRAFT
9/12/97
20:40
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