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Chapter 48. System Catalogs
Table 48-46.
pg_trigger
Columns
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
tgrelid
oid
pg_class
.oid
The table this trigger is
on
tgname
name
Trigger name (must be
unique among triggers
of same table)
tgfoid
oid
pg_proc
.oid
The function to be
called
tgtype
int2
Bit mask identifying
trigger firing conditions
tgenabled
char
Controls in which ses-
sion_replication_role
modes the trigger fires.
O
=trigger fires in
“origin” and “local”
modes,
D
=trigger is
disabled,
R
=trigger
fires in “replica” mode,
A
=trigger fires always.
tgisinternal
bool
True if trigger is
internally generated
(usually, to enforce the
constraint identifiedby
tgconstraint
)
tgconstrrelid
oid
pg_class
.oid
The table referenced by
areferential integrity
constraint
tgconstrindid
oid
pg_class
.oid
The index supporting a
unique, primary key,
referential integrity, or
exclusion constraint
tgconstraint
oid
pg_constraint
.oid
The
pg_constraint
entry associated with
the trigger, if any
tgdeferrable
bool
True if constraint
trigger is deferrable
tginitdeferred
bool
True if constraint
trigger is initially
deferred
tgnargs
int2
Number of argument
strings passed to
trigger function
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Chapter 48. System Catalogs
Name
Type
References
Description
tgattr
int2vector
pg_attribute
.attnum
Column numbers, if
trigger is
column-specific;
otherwise an empty
array
tgargs
bytea
Argument strings to
pass to trigger, each
NULL-terminated
tgqual
pg_node_tree
Expression tree (in
nodeToString()
representation) for the
trigger’s
WHEN
condition, or null if
none
Currently, column-specific triggering is supported only for
UPDATE
events, and so
tgattr
is rele-
vant only for that event type.
tgtype
might contain bits for other event types as well, but those are
presumed to be table-wide regardless of what is in
tgattr
.
Note: When
tgconstraint
is nonzero,
tgconstrrelid
,
tgconstrindid
,
tgdeferrable
,and
tginitdeferred
are largely redundant with the referenced
pg_constraint
entry. However, it is
possible for a non-deferrable trigger to be associated with a deferrable constraint: foreign key
constraints can have some deferrable and some non-deferrable triggers.
Note:
pg_class.relhastriggers
must be trueif a relation has any triggers in this catalog.
48.47.
pg_ts_config
The
pg_ts_config
catalog contains entries representing text search configurations. A configuration
specifies a particular text search parser and a list of dictionaries to use for each of the parser’s output
token types. The parser is shown in the
pg_ts_config
entry, but the token-to-dictionarymapping is
defined by subsidiary entries in
pg_ts_config_map
.
PostgreSQL’s text search features are described at length in Chapter 12.
Table 48-47.
pg_ts_config
Columns
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
cfgname
name
Text search
configuration name
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Chapter 48. System Catalogs
Name
Type
References
Description
cfgnamespace
oid
pg_namespace
.oid
The OID of the
namespace that
contains this
configuration
cfgowner
oid
pg_authid
.oid
Owner of the
configuration
cfgparser
oid
pg_ts_parser
.oid
The OID of the text
search parser for this
configuration
48.48.
pg_ts_config_map
The
pg_ts_config_map
catalog contains entries showing which text search dictionaries should be
consulted, and in what order, for each output token type of each text search configuration’s parser.
PostgreSQL’s text search features are described at length in Chapter 12.
Table 48-48.
pg_ts_config_map
Columns
Name
Type
References
Description
mapcfg
oid
pg_ts_config
.oid
The OID of the
pg_ts_config
entry
owning this map entry
maptokentype
integer
Atoken type emitted
by the configuration’s
parser
mapseqno
integer
Order in which to
consult this entry
(lower
mapseqno
s
first)
mapdict
oid
pg_ts_dict
.oid
The OID of the text
search dictionary to
consult
48.49.
pg_ts_dict
The
pg_ts_dict
catalog contains entries defining text search dictionaries. A dictionary depends on
atext search template, which specifies all the implementation functions needed; the dictionary itself
provides values for the user-settable parameters supported by the template. This division of labor
allows dictionaries to be created by unprivileged users. The parameters are specified by a text string
dictinitoption
,whose format and meaning vary depending on the template.
PostgreSQL’s text search features are described at length in Chapter 12.
Table 48-49.
pg_ts_dict
Columns
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Chapter 48. System Catalogs
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
dictname
name
Text search dictionary
name
dictnamespace
oid
pg_namespace
.oid
The OID of the
namespace that
contains this dictionary
dictowner
oid
pg_authid
.oid
Owner of the
dictionary
dicttemplate
oid
pg_ts_template
.oid
The OID of the text
search template for this
dictionary
dictinitoption
text
Initializationoption
string for the template
48.50.
pg_ts_parser
The
pg_ts_parser
catalog contains entries defining text search parsers. A parser is responsible for
splitting inputtext intolexemes and assigning a token type toeachlexeme. Since a parser mustbe im-
plemented by C-language-level functions, creation of new parsers is restricted to database superusers.
PostgreSQL’s text search features are described at length in Chapter 12.
Table 48-50.
pg_ts_parser
Columns
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
prsname
name
Text search parser
name
prsnamespace
oid
pg_namespace
.oid
The OID of the
namespace that
contains this parser
prsstart
regproc
pg_proc
.oid
OID of the parser’s
startup function
prstoken
regproc
pg_proc
.oid
OID of the parser’s
next-token function
prsend
regproc
pg_proc
.oid
OID of the parser’s
shutdown function
prsheadline
regproc
pg_proc
.oid
OID of the parser’s
headline function
prslextype
regproc
pg_proc
.oid
OID of the parser’s
lextype function
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Chapter 48. System Catalogs
48.51.
pg_ts_template
The
pg_ts_template
catalog contains entries defining text search templates. A template is the im-
plementation skeleton for a class of text search dictionaries. Since a template must be implemented
by C-language-level functions, creationof new templates is restricted to database superusers.
PostgreSQL’s text search features are described at length in Chapter 12.
Table 48-51.
pg_ts_template
Columns
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
tmplname
name
Text search template
name
tmplnamespace
oid
pg_namespace
.oid
The OID of the
namespace that
contains this template
tmplinit
regproc
pg_proc
.oid
OID of the template’s
initialization function
tmpllexize
regproc
pg_proc
.oid
OID of the template’s
lexize function
48.52.
pg_type
The catalog
pg_type
stores information about data types. Base types and enum types (scalar types)
are created with CREATE TYPE, and domains with CREATE DOMAIN. A composite type is auto-
matically created for each table in the database, to represent the row structure of the table. It is also
possible to create composite types with
CREATE TYPE AS
.
Table 48-52.
pg_type
Columns
Name
Type
References
Description
oid
oid
Row identifier (hidden
attribute; must be
explicitly selected)
typname
name
Data type name
typnamespace
oid
pg_namespace
.oid
The OID of the
namespace that
contains this type
typowner
oid
pg_authid
.oid
Owner of the type
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Chapter 48. System Catalogs
Name
Type
References
Description
typlen
int2
For a fixed-size type,
typlen
is the number
of bytes in the internal
representation of the
type. But for a
variable-length type,
typlen
is negative. -1
indicates a “varlena”
type (one that has a
length word), -2
indicates a
null-terminated C
string.
typbyval
bool
typbyval
determines
whether internal
routines pass a value of
this type by value or by
reference.
typbyval
had better be false if
typlen
is not 1, 2, or 4
(or 8 on machines
where Datum is 8
bytes). Variable-length
types are always passed
by reference. Note that
typbyval
can be false
even if the length
would allow
pass-by-value.
typtype
char
typtype
is
b
for a
base type,
c
for a
composite type (e.g., a
table’s row type),
d
for
adomain,
e
for an
enum type,
p
for a
pseudo-type, or
r
for a
range type. See also
typrelid
and
typbasetype
.
typcategory
char
typcategory
is an
arbitrary classification
of data types that is
used by the parser to
determine which
implicit casts should be
“preferred”. See Table
48-53.
1833
Chapter 48. System Catalogs
Name
Type
References
Description
typispreferred
bool
True if the type is a
preferred cast target
within its
typcategory
typisdefined
bool
True if the type is
defined, false if this is a
placeholder entry for a
not-yet-defined type.
When
typisdefined
is false, nothing except
the type name,
namespace, and OID
can be reliedon.
typdelim
char
Character that
separates two values of
this type when parsing
array input. Note that
the delimiter is
associated with the
array element data
type, not the array data
type.
typrelid
oid
pg_class
.oid
If this is a composite
type (see
typtype
),
thenthis column points
to the
pg_class
entry
that defines the
corresponding table.
(For a free-standing
composite type, the
pg_class
entry
doesn’t really represent
atable, but it is needed
anyway for the type’s
pg_attribute
entries
to link to.) Zero for
non-composite types.
1834
Chapter 48. System Catalogs
Name
Type
References
Description
typelem
oid
pg_type
.oid
If
typelem
is not 0
thenit identifies
another row in
pg_type
.The current
type can then be
subscripted like an
array yielding values of
type
typelem
.A
“true” array type is
variable length
(
typlen
=-1), but
some fixed-length
(
typlen
>0) types
also have nonzero
typelem
,for example
name
and
point
.If a
fixed-length type has a
typelem
then its
internal representation
must be some number
of values of the
typelem
data type
with no other data.
Variable-lengtharray
types have a header
defined by the array
subroutines.
typarray
oid
pg_type
.oid
If
typarray
is not 0
thenit identifies
another row in
pg_type
,which is the
“true” array type
havingthis type as
element
typinput
regproc
pg_proc
.oid
Input conversion
function (text format)
typoutput
regproc
pg_proc
.oid
Output conversion
function (text format)
typreceive
regproc
pg_proc
.oid
Input conversion
function (binary
format), or 0 if none
typsend
regproc
pg_proc
.oid
Output conversion
function (binary
format), or 0 if none
typmodin
regproc
pg_proc
.oid
Type modifier input
function, or 0 if type
does not support
modifiers
1835
Chapter 48. System Catalogs
Name
Type
References
Description
typmodout
regproc
pg_proc
.oid
Type modifier output
function, or 0 to use the
standard format
typanalyze
regproc
pg_proc
.oid
Custom
ANALYZE
function, or 0 to use the
standard function
1836
Chapter 48. System Catalogs
Name
Type
References
Description
typalign
char
typalign
is the
alignment required
when storing a value
of this type. It applies
to storage on disk as
well as most
representations of the
value inside
PostgreSQL. When
multiple values are
stored consecutively,
such as in the
representation of a
complete row on disk,
padding is inserted
before a datum of this
type so that it begins
on the specified
boundary. The
alignment reference is
the beginning of the
first datum in the
sequence.
Possible values are:
c
=
char
align-
ment, i.e., no align-
ment needed.
s
=
short
align-
ment (2 bytes on
most machines).
i
=
int
align-
ment (4 bytes on
most machines).
d
=
double
alignment (8 bytes
on many machines,
but by no means
all).
Note: For types
used in system
tables, it is critical
that the size and
alignment
defined in
pg_type
agree
with the way that
the compiler will
lay out the
column in a
structure
representing a
table row.
1837
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