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Before, some places didn't document the short options (-? and -V), some documented both, some documented nothing, and they were listed in various orders. Now this is hopefully more consistent and complete.
333 lines
9.7 KiB
Plaintext
333 lines
9.7 KiB
Plaintext
<!-- doc/src/sgml/oid2name.sgml -->
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<refentry id="oid2name">
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<refmeta>
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<refentrytitle>oid2name</refentrytitle>
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<manvolnum>1</manvolnum>
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<refmiscinfo>Application</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>oid2name</refname>
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<refpurpose>resolve OIDs and file nodes in a <productname>PostgreSQL</productname> data directory</refpurpose>
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</refnamediv>
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<indexterm zone="oid2name">
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<primary>oid2name</primary>
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</indexterm>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>oid2name</command>
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<arg rep="repeat"><replaceable>option</replaceable></arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>
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<application>oid2name</> is a utility program that helps administrators to
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examine the file structure used by PostgreSQL. To make use of it, you need
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to be familiar with the database file structure, which is described in
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<xref linkend="storage">.
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</para>
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<note>
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<para>
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The name <quote>oid2name</> is historical, and is actually rather
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misleading, since most of the time when you use it, you will really
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be concerned with tables' filenode numbers (which are the file names
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visible in the database directories). Be sure you understand the
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difference between table OIDs and table filenodes!
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</para>
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</note>
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<para>
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<application>oid2name</application> connects to a target database and
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extracts OID, filenode, and/or table name information. You can also have
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it show database OIDs or tablespace OIDs.
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</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>
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<application>oid2name</application> accepts the following command-line arguments:
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<variablelist>
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<varlistentry>
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<term><option>-f</option> <replaceable>filenode</></term>
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<listitem><para>show info for table with filenode <replaceable>filenode</></para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-i</option></term>
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<listitem><para>include indexes and sequences in the listing</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-o</option> <replaceable>oid</></term>
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<listitem><para>show info for table with OID <replaceable>oid</></para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-q</option></term>
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<listitem><para>omit headers (useful for scripting)</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-s</option></term>
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<listitem><para>show tablespace OIDs</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-S</option></term>
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<listitem><para>include system objects (those in
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<option>information_schema</option>, <option>pg_toast</option>
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and <option>pg_catalog</option> schemas)
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-t</option> <replaceable>tablename_pattern</></term>
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<listitem><para>show info for table(s) matching <replaceable>tablename_pattern</></para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-V</></term>
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<term><option>--version</></term>
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<listitem>
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<para>
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Print the <application>oid2name</application> version and exit.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-x</option></term>
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<listitem><para>display more information about each object shown: tablespace name,
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schema name, and OID
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-?</></term>
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<term><option>--help</></term>
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<listitem>
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<para>
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Show help about <application>oid2name</application> command line
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arguments, and exit.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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<para>
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<application>oid2name</application> also accepts the following command-line
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arguments for connection parameters:
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<variablelist>
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<varlistentry>
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<term><option>-d</option> <replaceable>database</></term>
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<listitem><para>database to connect to</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-H</option> <replaceable>host</></term>
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<listitem><para>database server's host</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-p</option> <replaceable>port</></term>
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<listitem><para>database server's port</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-U</option> <replaceable>username</></term>
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<listitem><para>user name to connect as</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-P</option> <replaceable>password</></term>
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<listitem><para>password (deprecated — putting this on the command line
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is a security hazard)</para></listitem>
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</varlistentry>
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</variablelist>
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</para>
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<para>
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To display specific tables, select which tables to show by
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using <option>-o</>, <option>-f</> and/or <option>-t</>.
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<option>-o</> takes an OID,
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<option>-f</> takes a filenode,
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and <option>-t</> takes a table name (actually, it's a <literal>LIKE</>
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pattern, so you can use things like <literal>foo%</>).
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You can use as many
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of these options as you like, and the listing will include all objects
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matched by any of the options. But note that these options can only
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show objects in the database given by <option>-d</>.
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</para>
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<para>
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If you don't give any of <option>-o</>, <option>-f</> or <option>-t</>,
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but do give <option>-d</>, it will list all tables in the database
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named by <option>-d</>. In this mode, the <option>-S</> and
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<option>-i</> options control what gets listed.
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</para>
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<para>
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If you don't give <option>-d</> either, it will show a listing of database
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OIDs. Alternatively you can give <option>-s</> to get a tablespace
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listing.
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</para>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para>
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<application>oid2name</> requires a running database server with
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non-corrupt system catalogs. It is therefore of only limited use
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for recovering from catastrophic database corruption situations.
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</para>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<screen>
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$ # what's in this database server, anyway?
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$ oid2name
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All databases:
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Oid Database Name Tablespace
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----------------------------------
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17228 alvherre pg_default
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17255 regression pg_default
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17227 template0 pg_default
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1 template1 pg_default
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$ oid2name -s
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All tablespaces:
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Oid Tablespace Name
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-------------------------
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1663 pg_default
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1664 pg_global
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155151 fastdisk
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155152 bigdisk
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$ # OK, let's look into database alvherre
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$ cd $PGDATA/base/17228
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$ # get top 10 db objects in the default tablespace, ordered by size
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$ ls -lS * | head -10
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-rw------- 1 alvherre alvherre 136536064 sep 14 09:51 155173
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-rw------- 1 alvherre alvherre 17965056 sep 14 09:51 1155291
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-rw------- 1 alvherre alvherre 1204224 sep 14 09:51 16717
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-rw------- 1 alvherre alvherre 581632 sep 6 17:51 1255
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-rw------- 1 alvherre alvherre 237568 sep 14 09:50 16674
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-rw------- 1 alvherre alvherre 212992 sep 14 09:51 1249
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-rw------- 1 alvherre alvherre 204800 sep 14 09:51 16684
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-rw------- 1 alvherre alvherre 196608 sep 14 09:50 16700
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-rw------- 1 alvherre alvherre 163840 sep 14 09:50 16699
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-rw------- 1 alvherre alvherre 122880 sep 6 17:51 16751
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$ # I wonder what file 155173 is ...
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$ oid2name -d alvherre -f 155173
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From database "alvherre":
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Filenode Table Name
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----------------------
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155173 accounts
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$ # you can ask for more than one object
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$ oid2name -d alvherre -f 155173 -f 1155291
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From database "alvherre":
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Filenode Table Name
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-------------------------
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155173 accounts
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1155291 accounts_pkey
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$ # you can mix the options, and get more details with -x
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$ oid2name -d alvherre -t accounts -f 1155291 -x
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From database "alvherre":
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Filenode Table Name Oid Schema Tablespace
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------------------------------------------------------
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155173 accounts 155173 public pg_default
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1155291 accounts_pkey 1155291 public pg_default
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$ # show disk space for every db object
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$ du [0-9]* |
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> while read SIZE FILENODE
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> do
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> echo "$SIZE `oid2name -q -d alvherre -i -f $FILENODE`"
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> done
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16 1155287 branches_pkey
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16 1155289 tellers_pkey
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17561 1155291 accounts_pkey
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...
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$ # same, but sort by size
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$ du [0-9]* | sort -rn | while read SIZE FN
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> do
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> echo "$SIZE `oid2name -q -d alvherre -f $FN`"
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> done
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133466 155173 accounts
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17561 1155291 accounts_pkey
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1177 16717 pg_proc_proname_args_nsp_index
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...
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$ # If you want to see what's in tablespaces, use the pg_tblspc directory
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$ cd $PGDATA/pg_tblspc
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$ oid2name -s
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All tablespaces:
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Oid Tablespace Name
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-------------------------
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1663 pg_default
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1664 pg_global
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155151 fastdisk
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155152 bigdisk
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$ # what databases have objects in tablespace "fastdisk"?
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$ ls -d 155151/*
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155151/17228/ 155151/PG_VERSION
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$ # Oh, what was database 17228 again?
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$ oid2name
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All databases:
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Oid Database Name Tablespace
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----------------------------------
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17228 alvherre pg_default
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17255 regression pg_default
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17227 template0 pg_default
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1 template1 pg_default
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$ # Let's see what objects does this database have in the tablespace.
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$ cd 155151/17228
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$ ls -l
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total 0
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-rw------- 1 postgres postgres 0 sep 13 23:20 155156
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$ # OK, this is a pretty small table ... but which one is it?
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$ oid2name -d alvherre -f 155156
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From database "alvherre":
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Filenode Table Name
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----------------------
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155156 foo
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</screen>
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</refsect1>
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<refsect1>
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<title>Author</title>
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<para>
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B. Palmer <email>bpalmer@crimelabs.net</email>
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</para>
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</refsect1>
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</refentry>
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