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【计算机专业文献翻译】数据库系统.doc
【计算机专业文献翻译】数据库系统
计算机专业中英文文献翻译
英文原文2:
DATABASE
SYSYTEMS
121
DATA
BASE
MANAGEMENT
SYSTEMS
You
know
that
a
data
ase
is
a
collection
of
logically
elated
data
elements
that
may
e
st
uctu
ed
in
va
ious
ways
to
meet
the
multiple
p
ocessing
and
et
ieval
needs
of
o
ganizations
and
individuals.
The
e’s
nothing
new
a
out
data
asesea
ly
ones
we
e
chiseled
in
stone,
penned
on
sc
olls,
and
w
itten
on
index
ca
ds.
But
now
data
ases
a
e
commonly
eco
ded
on
magnetizea
le
media,
and
compute
p
og
ams
a
e
equi
ed
to
pe
fo
m
the
necessa
y
sto
age
and
et
ieval
ope
ations.
You’ll
see
in
the
following
pages
that
complex
data
elationships
and
linkages
may
e
found
in
all
ut
the
simplest
data
ases.
The
system
softwa
e
package
that
handles
the
difficult
tasks
associated
with
c
eating,
accessing,
and
maintaining
data
ase
eco
ds
is
called
a
data
ase
management
system
(DBMS).
The
p
og
ams
in
a
DBMS
package
esta
lish
an
inte
face
etween
the
data
ase
itself
and
the
use
s
of
the
data
ase.
(These
use
s
may
e
applications
p
og
amme
s,
manage
s
and
othe
s
with
info
mation
needs,
and
va
ious
OS
p
og
am.)
A
DBMS
can
o
ganize,
p
ocess,
and
p
esent
selected
data
elements
f
om
the
data
ase.
This
capa
ility
ena
les
decision
make
s
to
sea
ch,
p
o
e,
and
que
y
data
ase
contents
in
o
de
to
ext
act
answe
s
to
non
ecu
ing
and
unplanned
questions
that
a
en’t
availa
le
in
egula
epo
ts.
These
questions
might
initially
e
vague
and
o
poo
ly
defined,
ut
people
can
“
owse”
th
ough
the
data
ase
until
they
have
the
needed
info
mation.
In
sho
t,
the
DBMS
will
“manage”
the
sto
ed
data
items
and
assem
le
the
needed
items
f
om
the
common
data
ase
in
esponse
to
the
que
ies
of
those
who
a
en’t
p
og
amme
s.
In
a
file
o
iented
system,
use
s
needing
special
info
mation
may
communicate
thei
needs
to
a
p
og
amme
,
who,
when
time
pe
mits,
will
w
ite
one
o
mo
e
p
og
ams
to
ext
act
the
data
and
p
epa
e
the
info
mation.
The
availa
ility
of
a
DBMS,
howeve
,
offe
s
use
s
a
much
faste
alte
native
communications
path
122
DBMS
STRUCTURIN
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