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oid2name

oid2name — resolve OIDs and file nodes in aPostgres Pro data directory

Synopsis

Description

oid2name is a utility program that helps administrators to examine the file structure used by Postgres Pro. To make use of it, you need to be familiar with the database file structure, which is described inChapter 63.

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:

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

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 aLIKE pattern, so you can use things likefoo%). 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.

Environment

This utility, like most otherPostgres Pro utilities, also uses the environment variables supported bylibpq (seeSection 32.15).

The environment variablePG_COLOR specifies whether to use color in diagnostic messages. Possible values arealways,auto andnever.

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?$ oid2nameAll databases:    Oid  Database Name  Tablespace----------------------------------  17228       alvherre  pg_default  17255     regression  pg_default  17227      template0  pg_default      1      template1  pg_default$ oid2name -sAll 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$ # What file is 155173?$ oid2name -d alvherre -f 155173From database "alvherre":  Filenode  Table Name----------------------    155173    accounts$ # you can ask for more than one object$ oid2name -d alvherre -f 155173 -f 1155291From 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 -xFrom 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 $FILENODE`"> done16            1155287  branches_pkey16            1155289  tellers_pkey17561            1155291  accounts_pkey...$ # same, but sort by size$ du [0-9]* | sort -rn | while read SIZE FN> do>   echo "$SIZE   `oid2name -q -d alvherre -f $FN`"> done133466             155173    accounts17561            1155291  accounts_pkey1177              16717  pg_proc_proname_args_nsp_index...$ # If you want to see what's in tablespaces, use the pg_tblspc directory$ cd $PGDATA/pg_tblspc$ oid2name -sAll 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?$ oid2nameAll 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 -ltotal 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 155156From database "alvherre":  Filenode  Table Name----------------------    155156         foo

Author

B. Palmer<bpalmer@crimelabs.net>