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Chapter 48. System Catalogs
Name
Type
References
Description
indpred
pg_node_tree
Expression tree (in
nodeToString()
representation) for
partial index predicate.
Null if not a partial
index.
48.27.
pg_inherits
The catalog
pg_inherits
records informationabout table inheritance hierarchies. There is one entry
for each directchild tablein the database. (Indirectinheritance can be determined by followingchains
of entries.)
Table 48-27.
pg_inherits
Columns
Name
Type
References
Description
inhrelid
oid
pg_class
.oid
The OID of the child
table
inhparent
oid
pg_class
.oid
The OID of the parent
table
inhseqno
int4
If there is more than
one direct parent for a
child table (multiple
inheritance), this
number tells the order
in which the inherited
columns are to be
arranged. The count
starts at 1.
48.28.
pg_language
The catalog
pg_language
registers languages in which you can write functions or storedprocedures.
See CREATE LANGUAGE and Chapter 39 for more information about language handlers.
Table 48-28.
pg_language
Columns
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
lanname
name
Name of the language
lanowner
oid
pg_authid
.oid
Owner of the language
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Chapter 48. System Catalogs
Name
Type
References
Description
lanispl
bool
This is false for
internal languages
(such as SQL) and true
for user-defined
languages. Currently,
pg_dump still uses this
to determine which
languages need to be
dumped, but this might
be replaced by a
different mechanism in
the future.
lanpltrusted
bool
True if this is a trusted
language, which means
that it is believed not to
grant access to
anything outside the
normal SQL execution
environment. Only
superusers can create
functions in untrusted
languages.
lanplcallfoid
oid
pg_proc
.oid
For noninternal
languages this
references the language
handler, which is a
special function that is
responsible for
executing all functions
that are written in the
particular language
laninline
oid
pg_proc
.oid
This references a
function that is
responsible for
executing “inline”
anonymous code
blocks (DO blocks).
Zero if inline blocks
are not supported.
lanvalidator
oid
pg_proc
.oid
This references a
language validator
function that is
responsible for
checking the syntax
and validity of new
functions when they
are created. Zero if no
validator is provided.
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Chapter 48. System Catalogs
Name
Type
References
Description
lanacl
aclitem[]
Access privileges; see
GRANT and REVOKE
for details
48.29.
pg_largeobject
The catalog
pg_largeobject
holds the data making up “large objects”. A large object is identified
by an OID assigned when it is created. Each large object is broken into segments or “pages” small
enough to be conveniently stored as rows in
pg_largeobject
.The amount of data per page is
defined tobe
LOBLKSIZE
(which is currently
BLCKSZ/4
,or typically 2 kB).
Prior to PostgreSQL 9.0, there was no permission structure associated with large objects. As a result,
pg_largeobject
was publicly readable and could be used to obtain the OIDs (and contents) of all
large objects in the system. This is no longer the case; use
pg_largeobject_metadata
to obtain a
list of large object OIDs.
Table 48-29.
pg_largeobject
Columns
Name
Type
References
Description
loid
oid
pg_largeobject_metadata
.oid
Identifier of the large
object that includes this
page
pageno
int4
Page number of this
page within its large
object (counting from
zero)
data
bytea
Actual data stored in
the large object. This
will never be more than
LOBLKSIZE
bytes and
might be less.
Each row of
pg_largeobject
holds data for one page of a large object, beginning at byte offset
(
pageno
*
LOBLKSIZE
)within the object. The implementation allows sparse storage: pages might
be missing, andmight be shorter than
LOBLKSIZE
bytes even if they are not the last page of theobject.
Missing regions within a large object read as zeroes.
48.30.
pg_largeobject_metadata
The catalog
pg_largeobject_metadata
holds metadata associated with large objects. The actual
large object data is stored in
pg_largeobject
.
Table 48-30.
pg_largeobject_metadata
Columns
Name
Type
References
Description
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Chapter 48. System Catalogs
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
lomowner
oid
pg_authid
.oid
Owner of the large
object
lomacl
aclitem[]
Access privileges; see
GRANT and REVOKE
for details
48.31.
pg_namespace
The catalog
pg_namespace
stores namespaces. A namespace is the structure underlying SQL
schemas: each namespace can have a separate collection of relations, types, etc. without name
conflicts.
Table 48-31.
pg_namespace
Columns
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
nspname
name
Name of the
namespace
nspowner
oid
pg_authid
.oid
Owner of the
namespace
nspacl
aclitem[]
Access privileges; see
GRANT and REVOKE
for details
48.32.
pg_opclass
The catalog
pg_opclass
defines index access method operator classes. Each operator class defines
semantics for index columns of a particular data type and a particular index access method. An oper-
ator class essentially specifies that a particular operator family is applicable to a particular indexable
column data type. The set of operators from the family that are actually usable with the indexed
column are whichever ones accept the column’s data type as their left-hand input.
Operator classes are described at length in Section 35.14.
Table 48-32.
pg_opclass
Columns
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
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Chapter 48. System Catalogs
Name
Type
References
Description
opcmethod
oid
pg_am
.oid
Index access method
operator class is for
opcname
name
Name of this operator
class
opcnamespace
oid
pg_namespace
.oid
Namespace of this
operator class
opcowner
oid
pg_authid
.oid
Owner of the operator
class
opcfamily
oid
pg_opfamily
.oid
Operator family
containing the operator
class
opcintype
oid
pg_type
.oid
Data type that the
operator class indexes
opcdefault
bool
True if this operator
class is the default for
opcintype
opckeytype
oid
pg_type
.oid
Type of data stored in
index, or zero if same
as
opcintype
An operator class’s
opcmethod
must match the
opfmethod
of its containing operator family. Also,
theremustbe nomore thanone
pg_opclass
rowhaving
opcdefault
true for anygivencombination
of
opcmethod
and
opcintype
.
48.33.
pg_operator
The catalog
pg_operator
stores information about operators. See CREATE OPERATOR and Sec-
tion 35.12 for more information.
Table 48-33.
pg_operator
Columns
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
oprname
name
Name of the operator
oprnamespace
oid
pg_namespace
.oid
The OID of the
namespace that
contains this operator
oprowner
oid
pg_authid
.oid
Owner of the operator
oprkind
char
b
=infix (“both”),
l
=
prefix (“left”),
r
=
postfix (“right”)
oprcanmerge
bool
This operator supports
merge joins
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Chapter 48. System Catalogs
Name
Type
References
Description
oprcanhash
bool
This operator supports
hash joins
oprleft
oid
pg_type
.oid
Type of the left
operand
oprright
oid
pg_type
.oid
Type of the right
operand
oprresult
oid
pg_type
.oid
Type of the result
oprcom
oid
pg_operator
.oid
Commutator of this
operator, if any
oprnegate
oid
pg_operator
.oid
Negator of this
operator, if any
oprcode
regproc
pg_proc
.oid
Function that
implements this
operator
oprrest
regproc
pg_proc
.oid
Restriction selectivity
estimation function for
this operator
oprjoin
regproc
pg_proc
.oid
Join selectivity
estimation function for
this operator
Unused columncontain zeroes. For example,
oprleft
is zero for a prefix operator.
48.34.
pg_opfamily
The catalog
pg_opfamily
defines operator families. Each operator familyis a collection of operators
and associated support routines that implement the semantics specified for a particular index access
method. Furthermore, the operators in a family are all “compatible”, in a way that is specified by the
access method. The operator family concept allows cross-data-type operators to be used with indexes
and to be reasoned about using knowledge of access method semantics.
Operator families are described at length in Section 35.14.
Table 48-34.
pg_opfamily
Columns
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
opfmethod
oid
pg_am
.oid
Index access method
operator family is for
opfname
name
Name of this operator
family
opfnamespace
oid
pg_namespace
.oid
Namespace of this
operator family
opfowner
oid
pg_authid
.oid
Owner of the operator
family
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Chapter 48. System Catalogs
The majority of theinformationdefining anoperator familyis not inits
pg_opfamily
row, butin the
associated rows in
pg_amop
,
pg_amproc
,and
pg_opclass
.
48.35.
pg_pltemplate
The catalog
pg_pltemplate
stores “template” information for procedural languages. A template for
alanguage allows the language to be created in a particular database by a simple
CREATE LANGUAGE
command, with no need to specify implementation details.
Unlike most system catalogs,
pg_pltemplate
is shared across all databases of a cluster: there is
only one copy of
pg_pltemplate
per cluster, not one per database. This allows the information to
be accessible in each database as it is needed.
Table 48-35.
pg_pltemplate
Columns
Name
Type
Description
tmplname
name
Name of the language this
template is for
tmpltrusted
boolean
True if language is considered
trusted
tmpldbacreate
boolean
True if language may be created
by a database owner
tmplhandler
text
Name of call handler function
tmplinline
text
Name of anonymous-block
handler function, or null if none
tmplvalidator
text
Name of validator function, or
null if none
tmpllibrary
text
Path of shared library that
implements language
tmplacl
aclitem[]
Access privileges for template
(not actually used)
There are not currently any commands that manipulate procedural language templates; to change the
built-in information, a superuser must modify the table using ordinary
INSERT
,
DELETE
,or
UPDATE
commands.
Note: It is likely that
pg_pltemplate
will be removed in some future release of PostgreSQL, in
favor of keeping this knowledge about procedural languages in their respective extension instal-
lation scripts.
48.36.
pg_proc
The catalog
pg_proc
stores information about functions (or procedures). See CREATE FUNCTION
and Section 35.3 for more information.
1814
Chapter 48. System Catalogs
The table contains data for aggregate functions as well as plain functions. If
proisagg
is true, there
should be a matching row in
pg_aggregate
.
Table 48-36.
pg_proc
Columns
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
proname
name
Name of the function
pronamespace
oid
pg_namespace
.oid
The OID of the
namespace that
contains this function
proowner
oid
pg_authid
.oid
Owner of the function
prolang
oid
pg_language
.oid
Implementation
language or call
interface of this
function
procost
float4
Estimated execution
cost (in units of
cpu_operator_cost); if
proretset
,this is
cost per row returned
prorows
float4
Estimated number of
result rows (zero if not
proretset
)
provariadic
oid
pg_type
.oid
Data type of the
variadic array
parameter’s elements,
or zero if the function
does not have a
variadic parameter
protransform
regproc
pg_proc
.oid
Calls to this function
can be simplified by
this other function (see
Section 35.9.11)
proisagg
bool
Function is an
aggregate function
proiswindow
bool
Function is a window
function
prosecdef
bool
Function is a security
definer (i.e., a “setuid”
function)
1815
Chapter 48. System Catalogs
Name
Type
References
Description
proleakproof
bool
The function has no
side effects. No
information about the
arguments is conveyed
except via the return
value. Any function
that might throw an
error depending on the
values of its arguments
is not leak-proof.
proisstrict
bool
Function returns null if
any call argument is
null. In that case the
function won’t actually
be called at all.
Functions that are not
“strict” must be
prepared to handle null
inputs.
proretset
bool
Function returns a set
(i.e., multiple values of
the specified data type)
provolatile
char
provolatile
tells
whether the function’s
result depends only on
its input arguments, or
is affected by outside
factors. It is
i
for
“immutable” functions,
which always deliver
the same result for the
same inputs. It is
s
for
“stable” functions,
whose results (for fixed
inputs) do not change
withina scan. It is
v
for
“volatile” functions,
whose results might
change at any time.
(Use
v
also for
functions with
side-effects, so that
calls tothem cannot get
optimized away.)
pronargs
int2
Number of input
arguments
pronargdefaults
int2
Number of arguments
that have defaults
1816
Chapter 48. System Catalogs
Name
Type
References
Description
prorettype
oid
pg_type
.oid
Data type of the return
value
proargtypes
oidvector
pg_type
.oid
An array with the data
types of the function
arguments. This
includes only input
arguments (including
INOUT
and
VARIADIC
arguments), and thus
represents the call
signature of the
function.
proallargtypes
oid[]
pg_type
.oid
An array with the data
types of the function
arguments. This
includes all arguments
(including
OUT
and
INOUT
arguments);
however, if all the
arguments are
IN
arguments, this field
will be null. Note that
subscripting is 1-based,
whereas for historical
reasons
proargtypes
is subscripted from 0.
proargmodes
char[]
An array with the
modes of the function
arguments, encoded as
i
for
IN
arguments,
o
for
OUT
arguments,
b
for
INOUT
arguments,
v
for
VARIADIC
arguments,
t
for
TABLE
arguments. If
all the arguments are
IN
arguments, this field
will be null. Note that
subscripts correspond
to positions of
proallargtypes
not
proargtypes
.
1817
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