'\" t
.\"     Title: oid2name
.\"    Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 2025
.\"    Manual: PostgreSQL 13.23 Documentation
.\"    Source: PostgreSQL 13.23
.\"  Language: English
.\"
.TH "OID2NAME" "1" "2025" "PostgreSQL 13.23" "PostgreSQL 13.23 Documentation"
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.SH "NAME"
oid2name \- resolve OIDs and file nodes in a PostgreSQL data directory
.SH "SYNOPSIS"
.HP \w'\fBoid2name\fR\ 'u
\fBoid2name\fR [\fIoption\fR...]
.SH "DESCRIPTION"
.PP
oid2name
is a utility program that helps administrators to examine the file structure used by PostgreSQL\&. To make use of it, you need to be familiar with the database file structure, which is described in
Chapter\ \&69\&.
.if n \{\
.sp
.\}
.RS 4
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBNote\fR
.ps -1
.br
.PP
The name
\(lqoid2name\(rq
is historical, and is actually rather misleading, since most of the time when you use it, you will really be concerned with tables\*(Aq filenode numbers (which are the file names visible in the database directories)\&. Be sure you understand the difference between table OIDs and table filenodes!
.sp .5v
.RE
.PP
oid2name
connects to a target database and extracts OID, filenode, and/or table name information\&. You can also have it show database OIDs or tablespace OIDs\&.
.SH "OPTIONS"
.PP
oid2name
accepts the following command\-line arguments:
.PP
\fB\-f \fR\fB\fIfilenode\fR\fR
.br
\fB\-\-filenode=\fR\fB\fIfilenode\fR\fR
.RS 4
show info for table with filenode
\fIfilenode\fR\&.
.RE
.PP
\fB\-i\fR
.br
\fB\-\-indexes\fR
.RS 4
include indexes and sequences in the listing\&.
.RE
.PP
\fB\-o \fR\fB\fIoid\fR\fR
.br
\fB\-\-oid=\fR\fB\fIoid\fR\fR
.RS 4
show info for table with OID
\fIoid\fR\&.
.RE
.PP
\fB\-q\fR
.br
\fB\-\-quiet\fR
.RS 4
omit headers (useful for scripting)\&.
.RE
.PP
\fB\-s\fR
.br
\fB\-\-tablespaces\fR
.RS 4
show tablespace OIDs\&.
.RE
.PP
\fB\-S\fR
.br
\fB\-\-system\-objects\fR
.RS 4
include system objects (those in
\fBinformation_schema\fR,
\fBpg_toast\fR
and
\fBpg_catalog\fR
schemas)\&.
.RE
.PP
\fB\-t \fR\fB\fItablename_pattern\fR\fR
.br
\fB\-\-table=\fR\fB\fItablename_pattern\fR\fR
.RS 4
show info for table(s) matching
\fItablename_pattern\fR\&.
.RE
.PP
\fB\-V\fR
.br
\fB\-\-version\fR
.RS 4
Print the
oid2name
version and exit\&.
.RE
.PP
\fB\-x\fR
.br
\fB\-\-extended\fR
.RS 4
display more information about each object shown: tablespace name, schema name, and OID\&.
.RE
.PP
\fB\-?\fR
.br
\fB\-\-help\fR
.RS 4
Show help about
oid2name
command line arguments, and exit\&.
.RE
.PP
oid2name
also accepts the following command\-line arguments for connection parameters:
.PP
\fB\-d \fR\fB\fIdatabase\fR\fR
.br
\fB\-\-dbname=\fR\fB\fIdatabase\fR\fR
.RS 4
database to connect to\&.
.RE
.PP
\fB\-h \fR\fB\fIhost\fR\fR
.br
\fB\-\-host=\fR\fB\fIhost\fR\fR
.RS 4
database server\*(Aqs host\&.
.RE
.PP
\fB\-H \fR\fB\fIhost\fR\fR
.RS 4
database server\*(Aqs host\&. Use of this parameter is
\fIdeprecated\fR
as of
PostgreSQL
12\&.
.RE
.PP
\fB\-p \fR\fB\fIport\fR\fR
.br
\fB\-\-port=\fR\fB\fIport\fR\fR
.RS 4
database server\*(Aqs port\&.
.RE
.PP
\fB\-U \fR\fB\fIusername\fR\fR
.br
\fB\-\-username=\fR\fB\fIusername\fR\fR
.RS 4
user name to connect as\&.
.RE
.PP
To display specific tables, select which tables to show by using
\fB\-o\fR,
\fB\-f\fR
and/or
\fB\-t\fR\&.
\fB\-o\fR
takes an OID,
\fB\-f\fR
takes a filenode, and
\fB\-t\fR
takes a table name (actually, it\*(Aqs a
LIKE
pattern, so you can use things like
foo%)\&. You can use as many of these options as you like, and the listing will include all objects matched by any of the options\&. But note that these options can only show objects in the database given by
\fB\-d\fR\&.
.PP
If you don\*(Aqt give any of
\fB\-o\fR,
\fB\-f\fR
or
\fB\-t\fR, but do give
\fB\-d\fR, it will list all tables in the database named by
\fB\-d\fR\&. In this mode, the
\fB\-S\fR
and
\fB\-i\fR
options control what gets listed\&.
.PP
If you don\*(Aqt give
\fB\-d\fR
either, it will show a listing of database OIDs\&. Alternatively you can give
\fB\-s\fR
to get a tablespace listing\&.
.SH "ENVIRONMENT"
.PP
\fBPGHOST\fR
.br
\fBPGPORT\fR
.br
\fBPGUSER\fR
.RS 4
Default connection parameters\&.
.RE
.PP
This utility, like most other
PostgreSQL
utilities, also uses the environment variables supported by
libpq
(see
Section\ \&33.14)\&.
.PP
The environment variable
\fBPG_COLOR\fR
specifies whether to use color in diagnostic messages\&. Possible values are
always,
auto
and
never\&.
.SH "NOTES"
.PP
oid2name
requires a running database server with non\-corrupt system catalogs\&. It is therefore of only limited use for recovering from catastrophic database corruption situations\&.
.SH "EXAMPLES"
.sp
.if n \{\
.RS 4
.\}
.nf
$ # what\*(Aqs in this database server, anyway?
$ oid2name
All databases:
    Oid  Database Name  Tablespace
\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
  17228       alvherre  pg_default
  17255     regression  pg_default
  17227      template0  pg_default
      1      template1  pg_default

$ oid2name \-s
All tablespaces:
     Oid  Tablespace Name
\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
    1663       pg_default
    1664        pg_global
  155151         fastdisk
  155152          bigdisk

$ # OK, let\*(Aqs look into database alvherre
$ cd $PGDATA/base/17228

$ # get top 10 db objects in the default tablespace, ordered by size
$ ls \-lS * | head \-10
\-rw\-\-\-\-\-\-\-  1 alvherre alvherre 136536064 sep 14 09:51 155173
\-rw\-\-\-\-\-\-\-  1 alvherre alvherre  17965056 sep 14 09:51 1155291
\-rw\-\-\-\-\-\-\-  1 alvherre alvherre   1204224 sep 14 09:51 16717
\-rw\-\-\-\-\-\-\-  1 alvherre alvherre    581632 sep  6 17:51 1255
\-rw\-\-\-\-\-\-\-  1 alvherre alvherre    237568 sep 14 09:50 16674
\-rw\-\-\-\-\-\-\-  1 alvherre alvherre    212992 sep 14 09:51 1249
\-rw\-\-\-\-\-\-\-  1 alvherre alvherre    204800 sep 14 09:51 16684
\-rw\-\-\-\-\-\-\-  1 alvherre alvherre    196608 sep 14 09:50 16700
\-rw\-\-\-\-\-\-\-  1 alvherre alvherre    163840 sep 14 09:50 16699
\-rw\-\-\-\-\-\-\-  1 alvherre alvherre    122880 sep  6 17:51 16751

$ # I wonder what file 155173 is \&.\&.\&.
$ oid2name \-d alvherre \-f 155173
From database "alvherre":
  Filenode  Table Name
\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
    155173    accounts

$ # you can ask for more than one object
$ oid2name \-d alvherre \-f 155173 \-f 1155291
From database "alvherre":
  Filenode     Table Name
\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
    155173       accounts
   1155291  accounts_pkey

$ # you can mix the options, and get more details with \-x
$ oid2name \-d alvherre \-t accounts \-f 1155291 \-x
From database "alvherre":
  Filenode     Table Name      Oid  Schema  Tablespace
\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
    155173       accounts   155173  public  pg_default
   1155291  accounts_pkey  1155291  public  pg_default

$ # show disk space for every db object
$ du [0\-9]* |
> while read SIZE FILENODE
> do
>   echo "$SIZE       `oid2name \-q \-d alvherre \-i \-f $FILENODE`"
> done
16            1155287  branches_pkey
16            1155289  tellers_pkey
17561            1155291  accounts_pkey
\&.\&.\&.

$ # same, but sort by size
$ du [0\-9]* | sort \-rn | while read SIZE FN
> do
>   echo "$SIZE   `oid2name \-q \-d alvherre \-f $FN`"
> done
133466             155173    accounts
17561            1155291  accounts_pkey
1177              16717  pg_proc_proname_args_nsp_index
\&.\&.\&.

$ # If you want to see what\*(Aqs in tablespaces, use the pg_tblspc directory
$ cd $PGDATA/pg_tblspc
$ oid2name \-s
All tablespaces:
     Oid  Tablespace Name
\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
    1663       pg_default
    1664        pg_global
  155151         fastdisk
  155152          bigdisk

$ # what databases have objects in tablespace "fastdisk"?
$ ls \-d 155151/*
155151/17228/  155151/PG_VERSION

$ # Oh, what was database 17228 again?
$ oid2name
All databases:
    Oid  Database Name  Tablespace
\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
  17228       alvherre  pg_default
  17255     regression  pg_default
  17227      template0  pg_default
      1      template1  pg_default

$ # Let\*(Aqs see what objects does this database have in the tablespace\&.
$ cd 155151/17228
$ ls \-l
total 0
\-rw\-\-\-\-\-\-\-  1 postgres postgres 0 sep 13 23:20 155156

$ # OK, this is a pretty small table \&.\&.\&. but which one is it?
$ oid2name \-d alvherre \-f 155156
From database "alvherre":
  Filenode  Table Name
\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
    155156         foo
.fi
.if n \{\
.RE
.\}
.SH "AUTHOR"
.PP
B\&. Palmer
<bpalmer@crimelabs\&.net>
