mirror of
https://github.com/postgres/postgres.git
synced 2025-10-29 22:49:41 +03:00
447 lines
16 KiB
Groff
447 lines
16 KiB
Groff
.\" This is -*-nroff-*-
|
|
.\" XXX standard disclaimer belongs here....
|
|
.\" $Header: /cvsroot/pgsql/doc/man/Attic/catalogs.3,v 1.1.1.1 1996/08/18 22:14:20 scrappy Exp $
|
|
.TH "SYSTEM CATALOGS" INTRO 03/13/94 Postgres95 Postgres95
|
|
.SH "Section 7 \(em System Catalogs"
|
|
.de LS
|
|
.PP
|
|
.if n .ta 5 +13 +13
|
|
.if t .ta 0.5i +1.3i +1.3i
|
|
.in 0
|
|
.nf
|
|
..
|
|
.de LE
|
|
.fi
|
|
.in
|
|
..
|
|
.SH "DESCRIPTION"
|
|
In this
|
|
section we list each of the attributes of the system catalogs and
|
|
define their meanings.
|
|
.SH "CLASS/TYPE SYSTEM CATALOGS"
|
|
These catalogs form the core of the extensibility system:
|
|
.LS
|
|
\fBname\fP \fBshared/local\fP \fBdescription\fP
|
|
pg_aggregate local aggregate functions
|
|
pg_am local access methods
|
|
pg_amop local operators usable with specific access methods
|
|
pg_amproc local procedures used with specific access methods
|
|
pg_attribute local class attributes
|
|
pg_class local classes
|
|
pg_index local secondary indices
|
|
pg_inherits local class inheritance hierarchy
|
|
pg_language local procedure implementation languages
|
|
pg_opclass local operator classes
|
|
pg_operator local query language operators
|
|
pg_proc local procedures (functions)
|
|
pg_type local data types
|
|
.LE
|
|
.SH "ENTITIES"
|
|
These catalogs deal with identification of entities known throughout
|
|
the site:
|
|
.LS
|
|
\fBname\fP \fBshared/local\fP \fBdescription\fP
|
|
pg_database shared current databases
|
|
pg_group shared user groups
|
|
pg_user shared valid users
|
|
.LE
|
|
.SH "RULE SYSTEM CATALOGS"
|
|
.LS
|
|
\fBname\fP \fBshared/local\fP \fBdescription\fP
|
|
pg_listener local processes waiting on alerters
|
|
pg_prs2plans local instance system procedures
|
|
pg_prs2rule local instance system rules
|
|
pg_prs2stub local instance system ``stubs''
|
|
pg_rewrite local rewrite system information
|
|
.LE
|
|
.SH "LARGE OBJECT CATALOGS"
|
|
.PP
|
|
These catalogs are specific to the Inversion file system and large
|
|
objects in general:
|
|
.LS
|
|
\fBname\fP \fBshared/local\fP \fBdescription\fP
|
|
pg_lobj local description of a large object
|
|
pg_naming local Inversion name space mapping
|
|
pg_platter local jukebox platter inventory
|
|
pg_plmap local jukebox platter extent map
|
|
.LE
|
|
.SH "INTERNAL CATALOGS"
|
|
.PP
|
|
These catalogs are internal classes that are not stored as normal
|
|
heaps and cannot be accessed through normal means (attempting to do so
|
|
causes an error).
|
|
.LS
|
|
\fBname\fP \fBshared/local\fP \fBdescription\fP
|
|
pg_log shared transaction commit/abort log
|
|
pg_magic shared magic constant
|
|
pg_time shared commit/abort times
|
|
pg_variable shared special variable values
|
|
.LE
|
|
.PP
|
|
There are several other classes defined with \*(lqpg_\*(rq names.
|
|
Aside from those that end in \*(lqind\*(rq (secondary indices), these
|
|
are all obsolete or otherwise deprecated.
|
|
.SH "CLASS/TYPE SYSTEM CATALOGS"
|
|
.PP
|
|
The following catalogs relate to the class/type system.
|
|
.nf M
|
|
/*
|
|
* aggregates
|
|
*
|
|
* see DEFINE AGGREGATE for an explanation of transition functions
|
|
*/
|
|
pg_aggregate
|
|
NameData aggname /* aggregate name (e.g., "count") */
|
|
oid aggowner /* usesysid of creator */
|
|
regproc aggtransfn1 /* first transition function */
|
|
regproc aggtransfn2 /* second transition function */
|
|
regproc aggfinalfn /* final function */
|
|
oid aggbasetype /* type of data on which aggregate
|
|
operates */
|
|
oid aggtranstype1 /* type returned by aggtransfn1 */
|
|
oid aggtranstype2 /* type returned by aggtransfn2 */
|
|
oid aggfinaltype /* type returned by aggfinalfn */
|
|
text agginitval1 /* external format of initial
|
|
(starting) value of aggtransfn1 */
|
|
text agginitval2 /* external format of initial
|
|
(starting) value of aggtransfn2 */
|
|
.fi
|
|
.nf M
|
|
pg_am
|
|
NameData amname /* access method name */
|
|
oid amowner /* usesysid of creator */
|
|
char amkind /* - deprecated */
|
|
/* originally:
|
|
h=hashed
|
|
o=ordered
|
|
s=special */
|
|
int2 amstrategies /* total NUMBER of strategies by which
|
|
we can traverse/search this AM */
|
|
int2 amsupport /* total NUMBER of support functions
|
|
that this AM uses */
|
|
regproc amgettuple /* "next valid tuple" function */
|
|
regproc aminsert /* "insert this tuple" function */
|
|
regproc amdelete /* "delete this tuple" function */
|
|
regproc amgetattr /* - deprecated */
|
|
regproc amsetlock /* - deprecated */
|
|
regproc amsettid /* - deprecated */
|
|
regproc amfreetuple /* - deprecated */
|
|
regproc ambeginscan /* "start new scan" function */
|
|
regproc amrescan /* "restart this scan" function */
|
|
regproc amendscan /* "end this scan" function */
|
|
regproc ammarkpos /* "mark current scan position"
|
|
function */
|
|
regproc amrestrpos /* "restore marked scan position"
|
|
function */
|
|
regproc amopen /* - deprecated */
|
|
regproc amclose /* - deprecated */
|
|
regproc ambuild /* "build new index" function */
|
|
regproc amcreate /* - deprecated */
|
|
regproc amdestroy /* - deprecated */
|
|
.fi
|
|
.nf M
|
|
pg_amop
|
|
oid amopid /* access method with which this
|
|
operator be used */
|
|
oid amopclaid /* operator class with which this
|
|
operator can be used */
|
|
oid amopopr /* the operator */
|
|
int2 amopstrategy /* traversal/search strategy number
|
|
to which this operator applies */
|
|
regproc amopselect /* function to calculate the operator
|
|
selectivity */
|
|
regproc amopnpages /* function to calculate the number of
|
|
pages that will be examined */
|
|
.fi
|
|
.nf M
|
|
pg_amproc
|
|
oid amid /* access method with which this
|
|
procedure is associated */
|
|
oid amopclaid /* operator class with which this
|
|
operator can be used */
|
|
oid amproc /* the procedure */
|
|
int2 amprocnum /* support function number to which
|
|
this operator applies */
|
|
.fi
|
|
.nf M
|
|
pg_class
|
|
NameData relname /* class name */
|
|
oid relowner /* usesysid of owner */
|
|
oid relam /* access method */
|
|
int4 relpages /* # of 8KB pages */
|
|
int4 reltuples /* # of instances */
|
|
abstime relexpires /* time after which instances are
|
|
deleted from non-archival storage */
|
|
reltime relpreserved /* timespan after which instances are
|
|
deleted from non-archival storage */
|
|
bool relhasindex /* does the class have a secondary
|
|
index? */
|
|
bool relisshared /* is the class shared or local? */
|
|
char relkind /* type of relation:
|
|
i=index
|
|
r=relation (heap)
|
|
s=special
|
|
u=uncatalogued (temporary) */
|
|
char relarch /* archive mode:
|
|
h=heavy
|
|
l=light
|
|
n=none */
|
|
int2 relnatts /* current # of non-system
|
|
attributes */
|
|
int2 relsmgr /* storage manager:
|
|
0=magnetic disk
|
|
1=sony WORM jukebox
|
|
2=main memory */
|
|
int28 relkey /* - unused */
|
|
oid8 relkeyop /* - unused */
|
|
aclitem relacl[1] /* access control lists */
|
|
.fi
|
|
.nf M
|
|
pg_attribute
|
|
oid attrelid /* class containing this attribute */
|
|
NameData attname /* attribute name */
|
|
oid atttypid /* attribute type */
|
|
oid attdefrel /* - deprecated */
|
|
int4 attnvals /* - deprecated */
|
|
oid atttyparg /* - deprecated */
|
|
int2 attlen /* attribute length, in bytes
|
|
-1=variable */
|
|
int2 attnum /* attribute number
|
|
>0=user attribute
|
|
<0=system attribute */
|
|
int2 attbound /* - deprecated */
|
|
bool attbyval /* type passed by value? */
|
|
bool attcanindex /* - deprecated */
|
|
oid attproc /* - deprecated */
|
|
int4 attnelems /* # of array dimensions */
|
|
int4 attcacheoff /* cached offset into tuple */
|
|
bool attisset /* is attribute set-valued? */
|
|
.fi
|
|
.nf M
|
|
pg_inherits
|
|
oid inhrel /* child class */
|
|
oid inhparent /* parent class */
|
|
int4 inhseqno /* - deprecated */
|
|
.fi
|
|
.nf M
|
|
oid indexrelid /* oid of secondary index class */
|
|
oid indrelid /* oid of indexed heap class */
|
|
oid indproc /* function to compute index key from
|
|
attribute(s) in heap
|
|
0=not a functional index */
|
|
int28 indkey /* attribute numbers of key
|
|
attribute(s) */
|
|
oid8 indclass /* opclass of each key */
|
|
bool indisclustered /* is the index clustered?
|
|
- unused */
|
|
bool indisarchived /* is the index archival?
|
|
- unused */
|
|
text indpred /* query plan for partial index
|
|
predicate */
|
|
.fi
|
|
.nf M
|
|
pg_type
|
|
NameData typname /* type name */
|
|
oid typowner /* usesysid of owner */
|
|
int2 typlen /* length in internal form
|
|
-1=variable-length */
|
|
int2 typprtlen /* length in external form */
|
|
bool typbyval /* type passed by value? */
|
|
char typtype /* kind of type:
|
|
c=catalog (composite)
|
|
b=base */
|
|
bool typisdefined /* defined or still a shell? */
|
|
char typdelim /* delimiter for array external form */
|
|
oid typrelid /* class (if composite) */
|
|
oid typelem /* type of each array element */
|
|
regproc typinput /* external-internal conversion
|
|
function */
|
|
regproc typoutput /* internal-external conversion
|
|
function */
|
|
regproc typreceive /* client-server conversion function */
|
|
regproc typsend /* server-client conversion function */
|
|
text typdefault /* default value */
|
|
.fi
|
|
.nf M
|
|
pg_operator
|
|
NameData oprname /* operator name */
|
|
oid oprowner /* usesysid of owner */
|
|
int2 oprprec /* - deprecated */
|
|
char oprkind /* kind of operator:
|
|
b=binary
|
|
l=left unary
|
|
r=right unary */
|
|
bool oprisleft /* is operator left/right associative? */
|
|
bool oprcanhash /* is operator usable for hashjoin? */
|
|
oid oprleft /* left operand type */
|
|
oid oprright /* right operand type */
|
|
oid oprresult /* result type */
|
|
oid oprcom /* commutator operator */
|
|
oid oprnegate /* negator operator */
|
|
oid oprlsortop /* sort operator for left operand */
|
|
oid oprrsortop /* sort operator for right operand */
|
|
regproc oprcode /* function implementing this operator */
|
|
regproc oprrest /* function to calculate operator
|
|
restriction selectivity */
|
|
regproc oprjoin /* function to calculate operator
|
|
join selectivity */
|
|
.fi
|
|
.nf M
|
|
pg_opclass
|
|
NameData opcname /* operator class name */
|
|
.fi
|
|
.nf M
|
|
pg_proc
|
|
NameData proname /* function name */
|
|
oid proowner /* usesysid of owner */
|
|
oid prolang /* function implementation language */
|
|
bool proisinh /* - deprecated */
|
|
bool proistrusted /* run in server or untrusted function
|
|
process? */
|
|
bool proiscachable /* can the function return values be
|
|
cached? */
|
|
int2 pronargs /* # of arguments */
|
|
bool proretset /* does the function return a set?
|
|
- unused */
|
|
oid prorettype /* return type */
|
|
oid8 proargtypes /* argument types */
|
|
int4 probyte_pct /* % of argument size (in bytes) that
|
|
needs to be examined in order to
|
|
compute the function */
|
|
int4 properbyte_cpu /* sensitivity of the function's
|
|
running time to the size of its
|
|
inputs */
|
|
int4 propercall_cpu /* overhead of the function's
|
|
invocation (regardless of input
|
|
size) */
|
|
int4 prooutin_ratio /* size of the function's output as a
|
|
percentage of the size of the input */
|
|
text prosrc /* function definition (postquel only) */
|
|
bytea probin /* path to object file (C only) */
|
|
.fi
|
|
.nf M
|
|
pg_language
|
|
NameData lanname /* language name */
|
|
text lancompiler /* - deprecated */
|
|
.fi
|
|
.SH "ENTITIES"
|
|
.nf M
|
|
pg_database
|
|
NameData datname /* database name */
|
|
oid datdba /* usesysid of database administrator */
|
|
text datpath /* directory of database under
|
|
$PGDATA */
|
|
.fi
|
|
.nf M
|
|
pg_group
|
|
NameData groname /* group name */
|
|
int2 grosysid /* group's UNIX group id */
|
|
int2 grolist[1] /* list of usesysids of group members */
|
|
.fi
|
|
.nf M
|
|
pg_user
|
|
NameData usename /* user's name */
|
|
int2 usesysid /* user's UNIX user id */
|
|
bool usecreatedb /* can user create databases? */
|
|
bool usetrace /* can user set trace flags? */
|
|
bool usesuper /* can user be POSTGRES superuser? */
|
|
bool usecatupd /* can user update catalogs? */
|
|
.fi
|
|
.SH "RULE SYSTEM CATALOGS"
|
|
.nf M
|
|
pg_listener
|
|
NameData relname /* class for which asynchronous
|
|
notification is desired */
|
|
int4 listenerpid /* process id of server corresponding
|
|
to a frontend program waiting for
|
|
asynchronous notification */
|
|
int4 notification /* whether an event notification for
|
|
this process id still pending */
|
|
|
|
.fi
|
|
.nf M
|
|
pg_prs2rule
|
|
NameData prs2name /* rule name */
|
|
char prs2eventtype /* rule event type:
|
|
R=retrieve
|
|
U=update (replace)
|
|
A=append
|
|
D=delete */
|
|
oid prs2eventrel /* class to which event applies */
|
|
int2 prs2eventattr /* attribute to which event applies */
|
|
float8 necessary /* - deprecated */
|
|
float8 sufficient /* - deprecated */
|
|
text prs2text /* text of original rule definition */
|
|
.fi
|
|
.nf M
|
|
pg_prs2plans
|
|
oid prs2ruleid /* prs2rule instance for which this
|
|
plan is used */
|
|
int2 prs2planno /* plan number (one rule may invoke
|
|
multiple plans) */
|
|
text prs2code /* external representation of the plan */
|
|
.fi
|
|
.nf M
|
|
pg_prs2stub
|
|
oid prs2relid /* class to which this rule applies */
|
|
bool prs2islast /* is this the last stub fragment? */
|
|
int4 prs2no /* stub fragment number */
|
|
stub prs2stub /* stub fragment */
|
|
.fi
|
|
.nf M
|
|
pg_rewrite
|
|
NameData rulename /* rule name */
|
|
char ev_type /* event type:
|
|
RETRIEVE, REPLACE, APPEND, DELETE
|
|
codes are parser-dependent (!?) */
|
|
oid ev_class /* class to which this rule applies */
|
|
int2 ev_attr /* attribute to which this rule applies */
|
|
bool is_instead /* is this an "instead" rule? */
|
|
text ev_qual /* qualification with which to modify
|
|
(rewrite) the plan that triggered this
|
|
rule */
|
|
text action /* parse tree of action */
|
|
.fi
|
|
.SH "LARGE OBJECT CATALOGS"
|
|
.nf M
|
|
pg_lobj
|
|
oid ourid /* 'ourid' from pg_naming that
|
|
identifies this object in the
|
|
Inversion file system namespace */
|
|
int4 objtype /* storage type code:
|
|
0=Inversion
|
|
1=Unix
|
|
2=External
|
|
3=Jaquith */
|
|
bytea object_descripto/* opaque object-handle structure */
|
|
.fi
|
|
.nf M
|
|
pg_naming
|
|
NameData filename /* filename component */
|
|
oid ourid /* random oid used to identify this
|
|
instance in other instances (can't
|
|
use the actual oid for obscure
|
|
reasons */
|
|
oid parentid /* pg_naming instance of parent
|
|
Inversion file system directory */
|
|
.fi
|
|
.nf M
|
|
pg_platter
|
|
NameData plname /* platter name */
|
|
int4 plstart /* the highest OCCUPIED extent */
|
|
.fi
|
|
.nf M
|
|
pg_plmap
|
|
oid plid /* platter (in pg_platter) on which
|
|
this extent (of blocks) resides */
|
|
oid pldbid /* database of the class to which this
|
|
extent (of blocks) belongs */
|
|
oid plrelid /* class to which this extend (of
|
|
blocks) belongs */
|
|
int4 plblkno /* starting block number within the
|
|
class */
|
|
int4 ploffset /* offset within the platter at which
|
|
this extent begins */
|
|
int4 plextentsz /* length of this extent */
|
|
.fi
|