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Chapter 48. System Catalogs
Name
Type
References
Description
reltuples
float4
Number of rows in the
table. This is only an
estimate used by the
planner. It is updated
by
VACUUM
,
ANALYZE
,
and a few DDL
commands such as
CREATE INDEX
.
relallvisible
int4
Number of pages that
are marked all-visible
in the table’s visibility
map. This is only an
estimate used by the
planner. It is updated
by
VACUUM
,
ANALYZE
,
and a few DDL
commands such as
CREATE INDEX
.
reltoastrelid
oid
pg_class
.oid
OID of the TOAST
table associated with
this table, 0 if none.
The TOAST table
stores large attributes
“out of line” in a
secondary table.
relhasindex
bool
True if this is a table
and it has (or recently
had) any indexes
relisshared
bool
True if this table is
shared across all
databases in the cluster.
Only certain system
catalogs (such as
pg_database
)are
shared.
relpersistence
char
p
=permanent table,
u
=unlogged table,
t
=
temporary table
relkind
char
r
=ordinary table,
i
=
index,
S
=sequence,
v
=view,
m
=
materialized view,
c
=
composite type,
t
=
TOAST table,
f
=
foreign table
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Chapter 48. System Catalogs
Name
Type
References
Description
relnatts
int2
Number of user
columns in the relation
(system columns not
counted). There must
be this many
corresponding entries
in
pg_attribute
.See
also
pg_attribute.attnum
.
relchecks
int2
Number of
CHECK
constraints onthe table;
see
pg_constraint
catalog
relhasoids
bool
True if we generate an
OID for each row of
the relation
relhaspkey
bool
True if the table has
(or once had) a primary
key
relhasrules
bool
True if table has (or
once had) rules; see
pg_rewrite
catalog
relhastriggers
bool
True if table has (or
once had) triggers; see
pg_trigger
catalog
relhassubclass
bool
True if table has (or
once had) any
inheritance children
relispopulated
bool
True if relation is
populated (this is true
for all relations other
thansome materialized
views)
relreplident
char
Columns used to form
“replica identity” for
rows:
d
=default
(primary key, if any),
n
=nothing,
f
=all
columns
i
=index with
indisreplident
set,
or default
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Chapter 48. System Catalogs
Name
Type
References
Description
relfrozenxid
xid
All transaction IDs
before this one have
been replaced with a
permanent (“frozen”)
transaction ID in this
table. This is used to
track whether the table
needs to be vacuumed
in order to prevent
transaction ID
wraparound or to allow
pg_clog
tobe shrunk.
Zero
(
InvalidTransactionId
)
if the relation is not a
table.
relminmxid
xid
All multixact IDs
before this one have
been replaced by a
transaction ID in this
table. This is used to
track whether the table
needs to be vacuumed
in order to prevent
multixact ID
wraparound or to allow
pg_multixact
to be
shrunk. Zero
(
InvalidMultiXactId
)
if the relation is not a
table.
relacl
aclitem[]
Access privileges; see
GRANT and REVOKE
for details
reloptions
text[]
Access-method-
specific options, as
“keyword=value”
strings
Several of the Boolean flags in
pg_class
are maintained lazily: they are guaranteed to be true if
that’s the correct state, but may not be reset to false immediately when the condition is no longer
true. For example,
relhasindex
is set by
CREATE INDEX
,but it is never cleared by
DROP INDEX
.
Instead,
VACUUM
clears
relhasindex
if it finds the table has no indexes. This arrangement avoids
race conditions and improves concurrency.
48.12.
pg_collation
The catalog
pg_collation
describes the available collations, which are essentially mappings from
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Chapter 48. System Catalogs
an SQL name to operating system locale categories. See Section 22.2 for more information.
Table 48-12.
pg_collation
Columns
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
collname
name
Collation name (unique
per namespace and
encoding)
collnamespace
oid
pg_namespace
.oid
The OID of the
namespace that
contains this collation
collowner
oid
pg_authid
.oid
Owner of the collation
collencoding
int4
Encoding in which the
collation is applicable,
or -1 if it works for any
encoding
collcollate
name
LC_COLLATE
for this
collation object
collctype
name
LC_CTYPE
for this
collation object
Note that the unique key on this catalog is (
collname
,
collencoding
,
collnamespace
)not
just (
collname
,
collnamespace
). PostgreSQL generally ignores all collations that do not have
collencoding
equal to either the current database’s encoding or -1, and creation of new entries
with the same name as an entry with
collencoding
=-1 is forbidden. Therefore it is sufficient to
use a qualified SQL name (
schema
.
name
)to identify a collation, even though this is not unique ac-
cording to the catalog definition. The reason for defining the catalog this way is that initdb fills it in
at cluster initialization time with entries for all locales available on the system, so it must be able to
hold entries for all encodings that might ever be used in the cluster.
Inthe
template0
database, itcould be usefulto createcollations whose encodingdoes notmatch the
database encoding, since they couldmatch the encodings of databases later cloned from
template0
.
This would currently have to be done manually.
48.13.
pg_constraint
The catalog
pg_constraint
stores check, primary key, unique, foreign key, and exclusion con-
straints on tables. (Columnconstraints are not treatedspecially. Everycolumnconstraint is equivalent
to some table constraint.) Not-null constraints are represented in the
pg_attribute
catalog, not
here.
User-defined constraint triggers (created with
CREATE CONSTRAINT TRIGGER
)also give rise to an
entry in this table.
Check constraints on domains are stored here, too.
Table 48-13.
pg_constraint
Columns
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Chapter 48. System Catalogs
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
conname
name
Constraint name (not
necessarily unique!)
connamespace
oid
pg_namespace
.oid
The OID of the
namespace that
contains this constraint
contype
char
c
=check constraint,
f
=foreign key
constraint,
p
=primary
key constraint,
u
=
unique constraint,
t
=
constraint trigger,
x
=
exclusion constraint
condeferrable
bool
Is the constraint
deferrable?
condeferred
bool
Is the constraint
deferred by default?
convalidated
bool
Has the constraint been
validated? Currently,
can only be false for
foreign keys and
CHECK constraints
conrelid
oid
pg_class
.oid
The table this
constraint is on; 0 if not
atable constraint
contypid
oid
pg_type
.oid
The domain this
constraint is on; 0 if not
adomain constraint
conindid
oid
pg_class
.oid
The index supporting
this constraint, if it’s a
unique, primary key,
foreign key, or
exclusion constraint;
else 0
confrelid
oid
pg_class
.oid
If a foreign key, the
referenced table; else 0
confupdtype
char
Foreign key update
action code:
a
=no
action,
r
=restrict,
c
=
cascade,
n
=set null,
d
=set default
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Chapter 48. System Catalogs
Name
Type
References
Description
confdeltype
char
Foreign key deletion
action code:
a
=no
action,
r
=restrict,
c
=
cascade,
n
=set null,
d
=set default
confmatchtype
char
Foreign key match
type:
f
=full,
p
=
partial,
s
=simple
conislocal
bool
This constraint is
defined locally for the
relation. Note that a
constraint can be
locally defined and
inherited
simultaneously.
coninhcount
int4
The number of direct
inheritance ancestors
this constraint has. A
constraint with a
nonzero number of
ancestors cannot be
dropped nor renamed.
connoinherit
bool
This constraint is
defined locally for the
relation. It is a
non-inheritable
constraint.
conkey
int2[]
pg_attribute
.attnum
If a table constraint
(including foreign
keys, but not constraint
triggers), list of the
constrained columns
confkey
int2[]
pg_attribute
.attnum
If a foreign key, list of
the referenced columns
conpfeqop
oid[]
pg_operator
.oid
If a foreign key, list of
the equality operators
for PK = FK
comparisons
conppeqop
oid[]
pg_operator
.oid
If a foreign key, list of
the equality operators
for PK = PK
comparisons
conffeqop
oid[]
pg_operator
.oid
If a foreign key, list of
the equality operators
for FK = FK
comparisons
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Chapter 48. System Catalogs
Name
Type
References
Description
conexclop
oid[]
pg_operator
.oid
If an exclusion
constraint, list of the
per-column exclusion
operators
conbin
pg_node_tree
If a check constraint,
an internal
representation of the
expression
consrc
text
If a check constraint, a
human-readable
representation of the
expression
In the case of an exclusion constraint,
conkey
is only useful for constraint elements that are sim-
ple column references. For other cases, a zero appears in
conkey
and the associated index must
be consulted to discover the expression that is constrained. (
conkey
thus has the same contents as
pg_index
.
indkey
for the index.)
Note:
consrc
is not updated when referenced objects change; for example, it won’t track renam-
ing of columns. Rather than relying on this field, it’s best to use
pg_get_constraintdef()
to
extract the definition of a check constraint.
Note:
pg_class.relchecks
needs to agree with the number of check-constraint entries found in
this table for each relation.
48.14.
pg_conversion
The catalog
pg_conversion
describes encoding conversion procedures. See CREATE CONVER-
SION for more information.
Table 48-14.
pg_conversion
Columns
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
conname
name
Conversion name
(unique within a
namespace)
connamespace
oid
pg_namespace
.oid
The OID of the
namespace that
contains this
conversion
1794
Chapter 48. System Catalogs
Name
Type
References
Description
conowner
oid
pg_authid
.oid
Owner of the
conversion
conforencoding
int4
Source encoding ID
contoencoding
int4
Destination encoding
ID
conproc
regproc
pg_proc
.oid
Conversion procedure
condefault
bool
True if this is the
default conversion
48.15.
pg_database
The catalog
pg_database
stores information about the available databases. Databases are created
with the CREATE DATABASE command. Consult Chapter 21 for details about the meaning of some
of the parameters.
Unlike most system catalogs,
pg_database
is shared across all databases of a cluster: there is only
one copy of
pg_database
per cluster, not one per database.
Table 48-15.
pg_database
Columns
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
datname
name
Database name
datdba
oid
pg_authid
.oid
Owner of the database,
usually the user who
created it
encoding
int4
Character encoding for
this database
(
pg_encoding_to_char()
can translate this
number to the encoding
name)
datcollate
name
LC_COLLATE for this
database
datctype
name
LC_CTYPE for this
database
datistemplate
bool
If true, then this
database can be cloned
by any user with
CREATEDB
privileges;
if false, thenonly
superusers or the owner
of the database can
clone it.
1795
Chapter 48. System Catalogs
Name
Type
References
Description
datallowconn
bool
If false then no one
can connect to this
database. This is used
to protect the
template0
database
from being altered.
datconnlimit
int4
Sets maximum
number of concurrent
connections that can be
made to this database.
-1 means no limit.
datlastsysoid
oid
Last system OIDin the
database; useful
particularly to
pg_dump
datfrozenxid
xid
All transaction IDs
before this one have
been replaced with a
permanent (“frozen”)
transaction ID in this
database. This is used
to track whether the
database needs to be
vacuumed in order to
prevent transaction ID
wraparound or to allow
pg_clog
tobe shrunk.
It is the minimum of
the per-table
pg_class
.
relfrozenxid
values.
datminmxid
xid
All multixact IDs
before this one have
been replaced with a
transaction ID in this
database. This is used
to track whether the
database needs to be
vacuumed in order to
prevent multixact ID
wraparound or to allow
pg_multixact
to be
shrunk. It is the
minimum of the
per-table
pg_class
.
relminmxid
values.
1796
Chapter 48. System Catalogs
Name
Type
References
Description
dattablespace
oid
pg_tablespace
.oid
The default tablespace
for the database.
Within this database,
all tables for which
pg_class
.
reltablespace
is zero will be stored in
this tablespace; in
particular, all the
non-shared system
catalogs will be there.
datacl
aclitem[]
Access privileges; see
GRANT and REVOKE
for details
48.16.
pg_db_role_setting
The catalog
pg_db_role_setting
records the default values that have been set for run-time con-
figuration variables, for each role and database combination.
Unlikemost system catalogs,
pg_db_role_setting
is shared across all databases of a cluster: there
is only one copy of
pg_db_role_setting
per cluster, not one per database.
Table 48-16.
pg_db_role_setting
Columns
Name
Type
References
Description
setdatabase
oid
pg_database
.oid
The OID of the
database the setting is
applicable to, or zero if
not database-specific
setrole
oid
pg_authid
.oid
The OID of the role the
setting is applicable to,
or zero if not
role-specific
setconfig
text[]
Defaults for run-time
configuration variables
48.17.
pg_default_acl
The catalog
pg_default_acl
stores initial privileges to be assigned to newly created objects.
Table 48-17.
pg_default_acl
Columns
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
1797
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