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Chapter 48. System Catalogs
Name
Type
References
Description
proargnames
text[]
An array with the
names of the function
arguments. Arguments
without a name are set
to empty strings in the
array. If none of the
arguments have a
name, this field will be
null. Note that
subscripts correspond
to positions of
proallargtypes
not
proargtypes
.
proargdefaults
pg_node_tree
Expression trees (in
nodeToString()
representation) for
default values. This is a
list with
pronargdefaults
elements,
corresponding to the
last
N
input arguments
(i.e., the last
N
proargtypes
positions). If none of
the arguments have
defaults, this field will
be null.
prosrc
text
This tells the function
handler how to invoke
the function. It might
be the actual source
code of the function for
interpreted languages,
alinksymbol, a file
name, or just about
anything else,
depending on the
implementation
language/call
convention.
probin
text
Additional information
about how to invoke
the function. Again, the
interpretation is
language-specific.
proconfig
text[]
Function’s local
settings for run-time
configuration variables
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Chapter 48. System Catalogs
Name
Type
References
Description
proacl
aclitem[]
Access privileges; see
GRANT and REVOKE
for details
For compiled functions, both built-in and dynamically loaded,
prosrc
contains the function’s C-
language name (link symbol). For all other currently-known language types,
prosrc
contains the
function’s source text.
probin
is unused except for dynamically-loaded C functions, for which it
gives the name of the shared library file containing the function.
48.37.
pg_range
The catalog
pg_range
stores information about range types. This is in addition to the types’ entries
in
pg_type
.
Table 48-37.
pg_range
Columns
Name
Type
References
Description
rngtypid
oid
pg_type
.oid
OID of the range type
rngsubtype
oid
pg_type
.oid
OID of the element
type (subtype) of this
range type
rngcollation
oid
pg_collation
.oid
OID of the collation
used for range
comparisons, or 0 if
none
rngsubopc
oid
pg_opclass
.oid
OID of the subtype’s
operator class used for
range comparisons
rngcanonical
regproc
pg_proc
.oid
OID of the function to
convert a range value
into canonical form, or
0if none
rngsubdiff
regproc
pg_proc
.oid
OID of the function to
return the difference
between two element
values as
double
precision
,or 0 if
none
rngsubopc
(plus
rngcollation
,if the elementtype is collatable) determines the sort ordering used
by the range type.
rngcanonical
is usedwhen the element type is discrete.
rngsubdiff
is optional
but should be supplied to improve performance of GiST indexes on the range type.
48.38.
pg_rewrite
The catalog
pg_rewrite
stores rewrite rules for tables and views.
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Chapter 48. System Catalogs
Table 48-38.
pg_rewrite
Columns
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
rulename
name
Rule name
ev_class
oid
pg_class
.oid
The table this rule is
for
ev_type
char
Event type that the
rule is for: 1 =
SELECT
,
2=
UPDATE
,3 =
INSERT
,4 =
DELETE
ev_enabled
char
Controls in which ses-
sion_replication_role
modes the rule fires.
O
=rule fires in “origin”
and “local” modes,
D
=
rule is disabled,
R
=
rule fires in “replica”
mode,
A
=rule fires
always.
is_instead
bool
True if the rule is an
INSTEAD
rule
ev_qual
pg_node_tree
Expression tree (in the
form of a
nodeToString()
representation) for the
rule’s qualifying
condition
ev_action
pg_node_tree
Query tree (in the form
of a
nodeToString()
representation) for the
rule’s action
Note:
pg_class.relhasrules
must be true if a table has any rules in this catalog.
48.39.
pg_replication_slots
The
pg_replication_slots
view provides a listing of all replication slots that currently exist on
the database cluster, along with their current state.
For more on replication slots, see Section 25.2.6 and Chapter 46.
Table 48-39.
pg_replication_slots
Columns
Name
Type
References
Description
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Chapter 48. System Catalogs
Name
Type
References
Description
slot_name
name
Aunique, cluster-wide
identifier for the
replication slot
plugin
name
The base name of the
shared object
containing the output
plugin this logical slot
is using, or null for
physical slots.
slot_type
text
The slot type -
physical
or
logical
datoid
oid
pg_database
.oid
The OID of the
database this slot is
associated with, or null.
Only logical slots have
an associated database.
database
text
pg_database
.datname
The name of the
database this slot is
associated with, or null.
Only logical slots have
an associated database.
active
boolean
True if this slot is
currently actively being
used
xmin
xid
The oldest transaction
that this slot needs the
database to retain.
VACUUM
cannot remove
tuples deleted by any
later transaction.
catalog_xmin
xid
The oldest transaction
affectingthe system
catalogs that this slot
needs the database to
retain.
VACUUM
cannot
remove catalog tuples
deleted by any later
transaction.
restart_lsn
pg_lsn
The address (
LSN
)of
oldest WAL which still
might be required by
the consumer of this
slot and thus won’t be
automatically removed
during checkpoints.
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Chapter 48. System Catalogs
48.40.
pg_seclabel
The catalog
pg_seclabel
stores security labels on database objects. Security labels can be manipu-
lated with the SECURITY LABEL command. For an easier way to view security labels, see Section
48.66.
See also
pg_shseclabel
,which performs a similar function for security labels of database objects
that are shared across a database cluster.
Table 48-40.
pg_seclabel
Columns
Name
Type
References
Description
objoid
oid
any OID column
The OID of the object
this security label
pertains to
classoid
oid
pg_class
.oid
The OID of the system
catalog this object
appears in
objsubid
int4
For a security label on
atable column, this is
the column number
(the
objoid
and
classoid
refer to the
table itself). For all
other object types, this
column is zero.
provider
text
The label provider
associated with this
label.
label
text
The security label
applied to this object.
48.41.
pg_shdepend
The catalog
pg_shdepend
records thedependencyrelationships between databaseobjects andshared
objects, such as roles. This information allows PostgreSQL to ensure that those objects are unrefer-
enced before attempting to delete them.
See also
pg_depend
,which performs a similar function for dependencies involving objects within a
single database.
Unlike most system catalogs,
pg_shdepend
is shared across all databases of a cluster: there is only
one copy of
pg_shdepend
per cluster, not one per database.
Table 48-41.
pg_shdepend
Columns
Name
Type
References
Description
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Chapter 48. System Catalogs
Name
Type
References
Description
dbid
oid
pg_database
.oid
The OID of the
database the dependent
object is in, or zero for
asharedobject
classid
oid
pg_class
.oid
The OID of the system
catalog the dependent
object is in
objid
oid
any OID column
The OID of the specific
dependent object
objsubid
int4
For a table column,
this is the column
number (the
objid
and
classid
refer to the
table itself). For all
other object types, this
column is zero.
refclassid
oid
pg_class
.oid
The OID of the system
catalog the referenced
object is in (must be a
shared catalog)
refobjid
oid
any OID column
The OID of the specific
referenced object
deptype
char
Acode defining the
specific semantics of
this dependency
relationship; see text
Inallcases, a
pg_shdepend
entryindicates thatthe referencedobjectcannot be droppedwithout also
dropping the dependent object. However, there are several subflavors identified by
deptype
:
SHARED_DEPENDENCY_OWNER
(
o
)
The referenced object (which must be a role) is the owner of the dependent object.
SHARED_DEPENDENCY_ACL
(
a
)
The referenced object (which must be a role) is mentioned in the ACL (access control list, i.e.,
privileges list) of the dependent object. (A
SHARED_DEPENDENCY_ACL
entry is notmade for the
owner of the object, since the owner will have a
SHARED_DEPENDENCY_OWNER
entry anyway.)
SHARED_DEPENDENCY_PIN
(
p
)
There is no dependent object; this type of entry is a signal that the system itself depends on the
referenced object, and so that object must never be deleted. Entries of this type are created only
by
initdb
.The columns for the dependent object contain zeroes.
Other dependency flavors mightbe needed in future. Note in particular that the current definitiononly
supports roles as referenced objects.
1823
Chapter 48. System Catalogs
48.42.
pg_shdescription
The catalog
pg_shdescription
stores optional descriptions (comments) for shared database ob-
jects. Descriptions can be manipulated with the COMMENT command and viewed with psql’s
\d
commands.
See also
pg_description
,which performs a similar function for descriptions involving objects
within a single database.
Unlikemostsystem catalogs,
pg_shdescription
is shared across alldatabases of a cluster: there is
only one copy of
pg_shdescription
per cluster, not one per database.
Table 48-42.
pg_shdescription
Columns
Name
Type
References
Description
objoid
oid
any OID column
The OID of the object
this description
pertains to
classoid
oid
pg_class
.oid
The OID of the system
catalog this object
appears in
description
text
Arbitrary text that
serves as the
description of this
object
48.43.
pg_shseclabel
The catalog
pg_shseclabel
stores security labels on shareddatabase objects. Securitylabels can be
manipulated with the SECURITY LABEL command. For an easier way to view security labels, see
Section 48.66.
Seealso
pg_seclabel
,whichperforms a similar functionfor securitylabels involving objects within
asingle database.
Unlike most system catalogs,
pg_shseclabel
is shared across all databases of a cluster: there is
only one copy of
pg_shseclabel
per cluster, not one per database.
Table 48-43.
pg_shseclabel
Columns
Name
Type
References
Description
objoid
oid
any OID column
The OID of the object
this security label
pertains to
classoid
oid
pg_class
.oid
The OID of the system
catalog this object
appears in
provider
text
The label provider
associated with this
label.
1824
Chapter 48. System Catalogs
Name
Type
References
Description
label
text
The security label
applied to this object.
48.44.
pg_statistic
The catalog
pg_statistic
stores statistical data about the contents of the database. Entries are
created byANALYZE and subsequently used by the query planner. Note thatall the statistical data is
inherently approximate, even assuming that it is up-to-date.
Normally there is one entry, with
stainherit
=
false
,for each table column that has been ana-
lyzed. If the table has inheritance children, a second entry with
stainherit
=
true
is also created.
This row represents the column’s statistics over the inheritance tree, i.e., statistics for the data you’d
see with
SELECT
column
FROM
table*
,whereas the
stainherit
=
false
row represents the re-
sults of
SELECT
column
FROM ONLY
table
.
pg_statistic
also stores statistical data about the values of index expressions. These are described
as if they were actual data columns; in particular,
starelid
references the index. No entry is made
for an ordinary non-expression index column, however, since it would be redundant with the entry
for the underlying table column. Currently, entries for index expressions always have
stainherit
=
false
.
Since different kinds of statistics might be appropriate for different kinds of data,
pg_statistic
is designed not to assume very much about what sort of statistics it stores. Only extremely general
statistics (such as nullness) are given dedicated columns in
pg_statistic
.Everything else is stored
in “slots”, which are groups of associated columns whose content is identified by a code number in
one of the slot’s columns. For more information see
src/include/catalog/pg_statistic.h
.
pg_statistic
should not be readable by the public, since even statistical information about a ta-
ble’s contents might be considered sensitive. (Example: minimum and maximum values of a salary
column might be quite interesting.)
pg_stats
is a publicly readable view on
pg_statistic
that
only exposes information about those tables that are readable by the current user.
Table 48-44.
pg_statistic
Columns
Name
Type
References
Description
starelid
oid
pg_class
.oid
The table or index that
the described column
belongs to
staattnum
int2
pg_attribute
.attnum
The number of the
described column
stainherit
bool
If true, the stats include
inheritance child
columns, not just the
values in the specified
relation
stanullfrac
float4
The fraction of the
column’s entries that
are null
1825
Chapter 48. System Catalogs
Name
Type
References
Description
stawidth
int4
The average stored
width, in bytes, of
nonnull entries
stadistinct
float4
The number of distinct
nonnull data values in
the column. A value
greater than zero is the
actual number of
distinct values. A value
less than zero is the
negative of a multiplier
for the number of rows
in the table; for
example, a column in
which values appear
about twice on the
average could be
represented by
stadistinct
=-0.5.
Azero value means the
number of distinct
values is unknown.
stakind
N
int2
Acode number
indicating the kind of
statistics stored in the
N
th “slot” of the
pg_statistic
row.
staop
N
oid
pg_operator
.oid
An operator used to
derive the statistics
stored in the
N
th “slot”.
For example, a
histogram slot would
show the
<
operator
that defines the sort
order of the data.
stanumbers
N
float4[]
Numerical statistics of
the appropriate kind for
the
N
th “slot”, or null if
the slot kind does not
involve numerical
values
1826
Chapter 48. System Catalogs
Name
Type
References
Description
stavalues
N
anyarray
Column data values of
the appropriate kind for
the
N
th “slot”, or null if
the slot kind does not
store any data values.
Each array’s element
values are actually of
the specific column’s
data type, or a related
type such as an array’s
element type, so there
is no way to define
these columns’ type
more specifically than
anyarray
.
48.45.
pg_tablespace
The catalog
pg_tablespace
stores informationabouttheavailabletablespaces. Tables canbeplaced
in particular tablespaces to aid administration of disk layout.
Unlike most system catalogs,
pg_tablespace
is shared across all databases of a cluster: there is
only one copy of
pg_tablespace
per cluster, not one per database.
Table 48-45.
pg_tablespace
Columns
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
spcname
name
Tablespace name
spcowner
oid
pg_authid
.oid
Owner of the
tablespace, usually the
user who created it
spcacl
aclitem[]
Access privileges; see
GRANT and REVOKE
for details
spcoptions
text[]
Tablespace-level
options, as
“keyword=value”
strings
48.46.
pg_trigger
The catalog
pg_trigger
stores triggers on tables and views. See CREATE TRIGGER for more
information.
1827
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