<s>
Oracle	B-General_Concept
Database	I-General_Concept
provides	O
information	O
about	O
all	O
of	O
the	O
tables	O
,	O
views	O
,	O
columns	O
,	O
and	O
procedures	B-General_Concept
in	O
a	O
database	O
.	O
</s>
<s>
Other	O
relational	B-Application
database	I-Application
management	I-Application
systems	I-Application
support	O
an	O
ANSI-standard	O
equivalent	O
called	O
information	O
schema	O
.	O
</s>
<s>
The	O
total	O
number	O
of	O
these	O
views	O
depends	O
on	O
the	O
Oracle	B-General_Concept
version	O
,	O
but	O
is	O
in	O
a	O
1000	O
range	O
.	O
</s>
<s>
The	O
main	O
built-in	O
views	O
accessing	O
Oracle	B-General_Concept
RDBMS	I-General_Concept
data	O
dictionary	O
tables	O
are	O
few	O
,	O
and	O
are	O
as	O
follows	O
:	O
</s>
<s>
ALL_ARGUMENTS	O
–	O
lists	O
the	O
arguments	O
of	O
functions	O
and	O
procedures	B-General_Concept
that	O
are	O
accessible	O
to	O
the	O
current	O
user	O
;	O
</s>
<s>
ALL_ERRORS	O
–	O
lists	O
descriptions	O
of	O
errors	O
on	O
all	O
stored	O
objects	O
(	O
views	O
,	O
procedures	B-General_Concept
,	O
functions	O
,	O
packages	O
,	O
and	O
package	O
bodies	O
)	O
that	O
are	O
accessible	O
to	O
the	O
current	O
user	O
;	O
</s>
<s>
ALL_OBJECT_SIZE	O
–	O
included	O
for	O
backward	O
compatibility	O
with	O
Oracle	B-General_Concept
version	O
5	O
;	O
</s>
<s>
ALL_PROCEDURES	O
–	O
(	O
from	O
Oracle	B-General_Concept
9	O
onwards	O
)	O
lists	O
all	O
functions	O
and	O
procedures	B-General_Concept
(	O
along	O
with	O
associated	O
properties	O
)	O
that	O
are	O
accessible	O
to	O
the	O
current	O
user	O
;	O
</s>
<s>
PL/SQL	O
)	O
source	O
of	O
the	O
stored	O
objects	O
accessible	O
to	O
the	O
current	O
user	O
;	O
</s>
<s>
a	O
more	O
restricted	O
view	B-Language
of	O
metadata	O
)	O
and	O
prefixed	O
"	O
DBA_	O
"	O
which	O
show	O
all	O
objects	O
in	O
the	O
database	O
(	O
i.e.	O
</s>
<s>
an	O
unrestricted	O
global	O
view	B-Language
of	O
metadata	O
for	O
the	O
database	O
instance	O
)	O
.	O
</s>
<s>
Note	O
that	O
NUM_ROWS	O
records	O
the	O
number	O
of	O
rows	O
which	O
were	O
in	O
a	O
table	B-Application
when	O
(	O
and	O
if	O
)	O
it	O
was	O
last	O
analyzed	O
.	O
</s>
<s>
This	O
will	O
most	O
likely	O
deviate	O
from	O
the	O
actual	O
number	O
of	O
rows	O
currently	O
in	O
the	O
table	B-Application
.	O
</s>
<s>
Warning	O
:	O
This	O
is	O
incomplete	O
with	O
respect	O
to	O
multiple	O
datatypes	O
including	O
char	O
,	O
varchar	O
and	O
timestamp	O
and	O
uses	O
extremely	O
old	O
,	O
deprecated	O
dictionary	O
views	O
,	O
back	O
to	O
oracle	B-General_Concept
5	O
.	O
</s>
<s>
The	O
underscore	O
is	O
a	O
special	O
SQL	B-Language
pattern	O
match	O
to	O
a	O
single	O
character	O
and	O
should	O
be	O
escaped	O
if	O
you	O
are	O
in	O
fact	O
looking	O
for	O
an	O
underscore	O
character	O
in	O
the	O
LIKE	O
clause	O
of	O
a	O
query	O
.	O
</s>
<s>
The	O
Oracle	B-General_Concept
product	O
Oracle	B-General_Concept
Enterprise	O
Metadata	O
Manager	O
(	O
EMM	O
)	O
is	O
an	O
ISO/IEC	O
11179	O
compatible	O
metadata	O
registry	O
.	O
</s>
<s>
In	O
January	O
2006	O
,	O
EMM	O
was	O
available	O
only	O
through	O
Oracle	B-General_Concept
consulting	O
services	O
.	O
</s>
