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Chapter 48. System Catalogs
Name
Type
References
Description
defaclrole
oid
pg_authid
.oid
The OID of the role
associated with this
entry
defaclnamespace
oid
pg_namespace
.oid
The OID of the
namespace associated
with this entry, or 0 if
none
defaclobjtype
char
Type of object this
entry is for:
r
=
relation (table, view),
S
=sequence,
f
=
function,
T
=type
defaclacl
aclitem[]
Access privileges that
this type of object
should have oncreation
A
pg_default_acl
entry shows the initial privileges to be assigned to an object belonging to the
indicated user. There are currently two types of entry: “global” entries with
defaclnamespace
=
0, and “per-schema” entries that reference a particular schema. If a global entry is present then it
overrides the normal hard-wired default privileges for the object type. A per-schema entry, if present,
represents privileges to be added to the global or hard-wired default privileges.
Note that when an ACL entry in another catalog is null, it is taken to represent the hard-wired
default privileges for its object, not whatever might be in
pg_default_acl
at the moment.
pg_default_acl
is only consulted during object creation.
48.18.
pg_depend
The catalog
pg_depend
records the dependency relationships between database objects. This infor-
mation allows
DROP
commands to find which other objects must be dropped by
DROP CASCADE
or
prevent dropping in the
DROP RESTRICT
case.
See also
pg_shdepend
,which performs a similar function for dependencies involving objects that
are shared across a database cluster.
Table 48-18.
pg_depend
Columns
Name
Type
References
Description
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
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Chapter 48. System Catalogs
Name
Type
References
Description
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
refobjid
oid
any OID column
The OID of the specific
referenced object
refobjsubid
int4
For a table column,
this is the column
number (the
refobjid
and
refclassid
refer
to the table itself). For
all other object types,
this column is zero.
deptype
char
Acode defining the
specific semantics of
this dependency
relationship; see text
In all cases, a
pg_depend
entry indicates that the referenced object cannot be dropped without also
dropping the dependent object. However, there are several subflavors identified by
deptype
:
DEPENDENCY_NORMAL
(
n
)
Anormal relationshipbetween separately-created objects. The dependent object can be dropped
withoutaffectingthereferencedobject. The referencedobject canonly be dropped by specifying
CASCADE
,in which case the dependent object is dropped, too. Example: a table column has a
normal dependencyon its data type.
DEPENDENCY_AUTO
(
a
)
The dependent object can be dropped separately from the referenced object, and should be au-
tomatically dropped (regardless of
RESTRICT
or
CASCADE
mode) if the referenced object is
dropped. Example: a named constraint on a table is made autodependent on the table, so that it
will go away if the table is dropped.
DEPENDENCY_INTERNAL
(
i
)
The dependent object was created as part of creation of the referenced object, and is really
just a part of its internal implementation. A
DROP
of the dependent object will be disallowed
outright (we’ll tell the user to issue a
DROP
against the referenced object, instead). A
DROP
of
the referencedobject will be propagatedthrough to drop the dependentobject whether
CASCADE
is specified or not. Example: a trigger that’s created to enforce a foreign-key constraint is made
internally dependent on the constraint’s
pg_constraint
entry.
DEPENDENCY_EXTENSION
(
e
)
The dependent object is a member of the extension that is the referenced object (see
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Chapter 48. System Catalogs
pg_extension
). The dependent object can be dropped only via
DROP EXTENSION
on the
referenced object. Functionally this dependency type acts the same as an internal dependency,
but it’s kept separate for clarity and to simplify pg_dump.
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 might be needed in future.
48.19.
pg_description
The catalog
pg_description
stores optionaldescriptions (comments) for each databaseobject. De-
scriptions can be manipulated with the COMMENT command and viewed with psql’s
\d
commands.
Descriptions of manybuilt-in system objectsareprovidedinthe initial contents of
pg_description
.
See also
pg_shdescription
,which performs a similar function for descriptions involving objects
that are shared across a database cluster.
Table 48-19.
pg_description
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
objsubid
int4
For a comment on a
table column, this is
the column number
(the
objoid
and
classoid
refer to the
table itself). For all
other object types, this
column is zero.
description
text
Arbitrary text that
serves as the
description of this
object
48.20.
pg_enum
The
pg_enum
catalog contains entries showing the values andlabels for each enum type. The internal
representation of a given enum value is actually the OID of its associated row in
pg_enum
.
Table 48-20.
pg_enum
Columns
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Chapter 48. System Catalogs
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
enumtypid
oid
pg_type
.oid
The OID of the
pg_type
entry owning
this enum value
enumsortorder
float4
The sort position of
this enum value within
its enum type
enumlabel
name
The textual label for
this enum value
The OIDs for
pg_enum
rows followa special rule:even-numberedOIDs areguaranteed to be ordered
in the same way as the sort ordering of their enum type. That is, if two even OIDs belong to the
same enum type, the smaller OIDmust have the smaller
enumsortorder
value. Odd-numberedOID
values need bear no relationship to the sort order. This rule allows the enum comparison routines to
avoid catalog lookups in many common cases. The routines that create and alter enum types attempt
to assign even OIDs to enum values whenever possible.
When anenum type is created, its members are assignedsort-order positions 1..
n
.But members added
later might be given negative or fractional values of
enumsortorder
.The only requirementon these
values is that they be correctly ordered and unique within each enum type.
48.21.
pg_event_trigger
The catalog
pg_event_trigger
stores event triggers. See Chapter 37 for more information.
Table 48-21.
pg_event_trigger
Columns
Name
Type
References
Description
evtname
name
Trigger name (must be
unique)
evtevent
name
Identifies the event for
which this trigger fires
evtowner
oid
pg_authid
.oid
Owner of the event
trigger
evtfoid
oid
pg_proc
.oid
The function to be
called
evtenabled
char
Controls in which ses-
sion_replication_role
modes the event trigger
fires.
O
=trigger fires in
“origin” and “local”
modes,
D
=trigger is
disabled,
R
=trigger
fires in “replica” mode,
A
=trigger fires always.
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Chapter 48. System Catalogs
Name
Type
References
Description
evttags
text[]
Command tags for
which this trigger will
fire. If NULL, the firing
of this trigger is not
restricted on the basis
of the command tag.
48.22.
pg_extension
The catalog
pg_extension
stores information about the installed extensions. See Section 35.15 for
details about extensions.
Table 48-22.
pg_extension
Columns
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
extname
name
Name of the extension
extowner
oid
pg_authid
.oid
Owner of the extension
extnamespace
oid
pg_namespace
.oid
Schema containing the
extension’s exported
objects
extrelocatable
bool
True if extension can
be relocated to another
schema
extversion
text
Version name for the
extension
extconfig
oid[]
pg_class
.oid
Array of
regclass
OIDs for the
extension’s
configuration table(s),
or
NULL
if none
extcondition
text[]
Array of
WHERE
-clause
filter conditions for the
extension’s
configuration table(s),
or
NULL
if none
Note that unlike most catalogs with a “namespace” column,
extnamespace
is not meant to imply
that the extension belongs to that schema. Extension names are never schema-qualified. Rather,
extnamespace
indicates the schema that contains most or all of the extension’s objects. If
extrelocatable
is true, then this schema must in fact contain all schema-qualifiable objects
belonging to the extension.
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Chapter 48. System Catalogs
48.23.
pg_foreign_data_wrapper
The catalog
pg_foreign_data_wrapper
stores foreign-data wrapper definitions. A foreign-data
wrapper is the mechanism by which external data, residing on foreign servers, is accessed.
Table 48-23.
pg_foreign_data_wrapper
Columns
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
fdwname
name
Name of the
foreign-data wrapper
fdwowner
oid
pg_authid
.oid
Owner of the
foreign-data wrapper
fdwhandler
oid
pg_proc
.oid
References a handler
function that is
responsible for
supplying execution
routines for the
foreign-data wrapper.
Zero if no handler is
provided
fdwvalidator
oid
pg_proc
.oid
References a validator
function that is
responsible for
checking the validity of
the options given to the
foreign-data wrapper,
as well as options for
foreign servers and
user mappings using
the foreign-data
wrapper. Zero if no
validator is provided
fdwacl
aclitem[]
Access privileges; see
GRANT and REVOKE
for details
fdwoptions
text[]
Foreign-data wrapper
specific options, as
“keyword=value”
strings
48.24.
pg_foreign_server
The catalog
pg_foreign_server
stores foreign server definitions. A foreign server describes a
source of external data, such as a remote server. Foreign servers are accessed via foreign-data wrap-
pers.
1803
Chapter 48. System Catalogs
Table 48-24.
pg_foreign_server
Columns
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
srvname
name
Name of the foreign
server
srvowner
oid
pg_authid
.oid
Owner of the foreign
server
srvfdw
oid
pg_foreign_data_wrapper
.oid
OID of the foreign-data
wrapper of this foreign
server
srvtype
text
Type of the server
(optional)
srvversion
text
Version of the server
(optional)
srvacl
aclitem[]
Access privileges; see
GRANT and REVOKE
for details
srvoptions
text[]
Foreign server specific
options, as
“keyword=value”
strings
48.25.
pg_foreign_table
The catalog
pg_foreign_table
contains auxiliaryinformation aboutforeigntables. Aforeigntable
is primarily represented by a
pg_class
entry, just like a regular table. Its
pg_foreign_table
entry
contains the information that is pertinent only to foreign tables and not any other kind of relation.
Table 48-25.
pg_foreign_table
Columns
Name
Type
References
Description
ftrelid
oid
pg_class
.oid
OID of the
pg_class
entry for this foreign
table
ftserver
oid
pg_foreign_server
.oid
OID of the foreign
server for this foreign
table
ftoptions
text[]
Foreign table options,
as “keyword=value”
strings
1804
Chapter 48. System Catalogs
48.26.
pg_index
The catalog
pg_index
contains part of the information about indexes. The rest is mostly in
pg_class
.
Table 48-26.
pg_index
Columns
Name
Type
References
Description
indexrelid
oid
pg_class
.oid
The OID of the
pg_class
entry for
this index
indrelid
oid
pg_class
.oid
The OID of the
pg_class
entryfor the
table this index is for
indnatts
int2
The number of
columns in the index
(duplicates
pg_class.relnatts
)
indisunique
bool
If true, this is a unique
index
indisprimary
bool
If true, this index
represents the primary
key of the table
(
indisunique
should
always be true when
this is true)
indisexclusion
bool
If true, this index
supports anexclusion
constraint
indimmediate
bool
If true, the uniqueness
check is enforced
immediately on
insertion (irrelevant if
indisunique
is not
true)
indisclustered
bool
If true, the table was
last clustered on this
index
1805
Chapter 48. System Catalogs
Name
Type
References
Description
indisvalid
bool
If true, the index is
currently valid for
queries. False means
the indexis possibly
incomplete: it must still
be modified by
INSERT
/
UPDATE
operations, but it
cannot safely be used
for queries. If it is
unique, the uniqueness
property is not
guaranteed true either.
indcheckxmin
bool
If true, queries must
not use the index until
the
xmin
of this
pg_index
row is
below their
TransactionXmin
event horizon, because
the table may contain
broken HOT chains
with incompatible rows
that they can see
indisready
bool
If true, the index is
currently ready for
inserts. False means the
index must be ignored
by
INSERT
/
UPDATE
operations.
indislive
bool
If false, the index is in
process of being
dropped, and should be
ignored for all
purposes (including
HOT-safety decisions)
indisreplident
bool
If true this index has
been chosen as “replica
identity” using
ALTER
TABLE ... REPLICA
IDENTITY USING
INDEX ...
1806
Chapter 48. System Catalogs
Name
Type
References
Description
indkey
int2vector
pg_attribute
.attnum
This is an array of
indnatts
values that
indicate which table
columns this index
indexes. For example a
value of
1 3
would
mean that the first and
the third table columns
make up the index key.
Azero in this array
indicates that the
corresponding index
attribute is an
expression over the
table columns, rather
thana simple column
reference.
indcollation
oidvector
pg_collation
.oid
For each column in the
index key, this contains
the OIDof the collation
to use for the index.
indclass
oidvector
pg_opclass
.oid
For each column in the
index key, this contains
the OID of the operator
class to use. See
pg_opclass
for
details.
indoption
int2vector
This is an array of
indnatts
values that
store per-column flag
bits. The meaning of
the bits is defined by
the index’s access
method.
indexprs
pg_node_tree
Expression trees (in
nodeToString()
representation) for
index attributes that are
not simple column
references. This is a list
with one element for
each zero entry in
indkey
.Null if all
index attributes are
simple references.
1807
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