OID2NAME(1)						  PostgreSQL 9.2.7 Documentation					       OID2NAME(1)

NAME

       oid2name - resolve OIDs and file nodes in a PostgreSQL data directory

SYNOPSIS

       oid2name [option...]

DESCRIPTION

       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 56, Database Physical Storage, in the documentation.

	   Note
	   The name "oid2name" is historical, and is actually rather misleading, since most of the time when you use it, you will really be
	   concerned with tables' filenode numbers (which are the file names visible in the database directories). Be sure you understand the
	   difference between table OIDs and table filenodes!

       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.

OPTIONS

       oid2name accepts the following command-line arguments:

       -f filenode
	   show info for table with filenode filenode

       -i
	   include indexes and sequences in the listing

       -o oid
	   show info for table with OID oid

       -q
	   omit headers (useful for scripting)

       -s
	   show tablespace OIDs

       -S
	   include system objects (those in information_schema, pg_toast and pg_catalog schemas)

       -t tablename_pattern
	   show info for table(s) matching tablename_pattern

       -V, --version
	   Print the oid2name version and exit.

       -x
	   display more information about each object shown: tablespace name, schema name, and OID

       -?, --help
	   Show help about oid2name command line arguments, and exit.

       oid2name also accepts the following command-line arguments for connection parameters:

       -d database
	   database to connect to

       -H host
	   database server's host

       -p port
	   database server's port

       -U username
	   user name to connect as

       -P password
	   password (deprecated -- putting this on the command line is a security hazard)

       To display specific tables, select which tables to show by using -o, -f and/or -t.  -o takes an OID, -f takes a filenode, and -t takes a
       table name (actually, it's 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
       -d.

       If you don't give any of -o, -f or -t, but do give -d, it will list all tables in the database named by -d. In this mode, the -S and -i
       options control what gets listed.

       If you don't give -d either, it will show a listing of database OIDs. Alternatively you can give -s to get a tablespace listing.

NOTES

       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.

EXAMPLES

	   $ # what's 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's 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's 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's 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

AUTHOR

       B. Palmer <bpalmer@crimelabs.net>

PostgreSQL 9.2.7						    2014-02-17							       OID2NAME(1)