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Add pg_table_size() and pg_indexes_size() to provide more user-friendly 

wrappers around the pg_relation_size() function.

Bernd Helmle, reviewed by Greg Smith
This commit is contained in:
Tom Lane 2010-01-19 05:50:18 +00:00
parent 309cd7cf18
commit 4f15699d70
5 changed files with 228 additions and 84 deletions
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122
doc/src/sgml/func.sgml
View File

@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.496 2010/01/15 09:18:58 heikki Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.497 2010/01/19 05:50:18 tgl Exp $ -->
<chapter id="functions">
<title>Functions and Operators</title>
@ -13206,21 +13206,27 @@ postgres=# SELECT * FROM pg_xlogfile_name_offset(pg_stop_backup());
<indexterm>
<primary>pg_column_size</primary>
</indexterm>
<indexterm>
<primary>pg_total_relation_size</primary>
</indexterm>
<indexterm>
<primary>pg_table_size</primary>
</indexterm>
<indexterm>
<primary>pg_indexes_size</primary>
</indexterm>
<indexterm>
<primary>pg_database_size</primary>
</indexterm>
<indexterm>
<primary>pg_tablespace_size</primary>
</indexterm>
<indexterm>
<primary>pg_relation_size</primary>
</indexterm>
<indexterm>
<primary>pg_size_pretty</primary>
</indexterm>
<indexterm>
<primary>pg_tablespace_size</primary>
</indexterm>
<indexterm>
<primary>pg_total_relation_size</primary>
</indexterm>
<table id="functions-admin-dbsize">
<title>Database Object Size Functions</title>
@ -13236,6 +13242,37 @@ postgres=# SELECT * FROM pg_xlogfile_name_offset(pg_stop_backup());
<entry><type>int</type></entry>
<entry>Number of bytes used to store a particular value (possibly compressed)</entry>
</row>
<row>
<entry>
<literal><function>pg_total_relation_size</function>(<type>regclass</type>)</literal>
</entry>
<entry><type>bigint</type></entry>
<entry>
Total disk space used by the table with the specified OID or name,
including all indexes and <acronym>TOAST</> data
</entry>
</row>
<row>
<entry>
<literal><function>pg_table_size</function>(<type>regclass</type>)</literal>
</entry>
<entry><type>bigint</type></entry>
<entry>
Disk space used by the table with the specified OID or name,
excluding indexes (but including TOAST, free space map, and visibility
map)
</entry>
</row>
<row>
<entry>
<literal><function>pg_indexes_size</function>(<type>regclass</type>)</literal>
</entry>
<entry><type>bigint</type></entry>
<entry>
Total disk space used by indexes attached to the table with the
specified OID or name
</entry>
</row>
<row>
<entry>
<literal><function>pg_database_size</function>(<type>oid</type>)</literal>
@ -13250,6 +13287,20 @@ postgres=# SELECT * FROM pg_xlogfile_name_offset(pg_stop_backup());
<entry><type>bigint</type></entry>
<entry>Disk space used by the database with the specified name</entry>
</row>
<row>
<entry>
<literal><function>pg_tablespace_size</function>(<type>oid</type>)</literal>
</entry>
<entry><type>bigint</type></entry>
<entry>Disk space used by the tablespace with the specified OID</entry>
</row>
<row>
<entry>
<literal><function>pg_tablespace_size</function>(<type>name</type>)</literal>
</entry>
<entry><type>bigint</type></entry>
<entry>Disk space used by the tablespace with the specified name</entry>
</row>
<row>
<entry>
<literal><function>pg_relation_size</function>(<parameter>relation</parameter> <type>regclass</type>, <parameter>fork</parameter> <type>text</type>)</literal>
@ -13277,30 +13328,6 @@ postgres=# SELECT * FROM pg_xlogfile_name_offset(pg_stop_backup());
<entry><type>text</type></entry>
<entry>Converts a size in bytes into a human-readable format with size units</entry>
</row>
<row>
<entry>
<literal><function>pg_tablespace_size</function>(<type>oid</type>)</literal>
</entry>
<entry><type>bigint</type></entry>
<entry>Disk space used by the tablespace with the specified OID</entry>
</row>
<row>
<entry>
<literal><function>pg_tablespace_size</function>(<type>name</type>)</literal>
</entry>
<entry><type>bigint</type></entry>
<entry>Disk space used by the tablespace with the specified name</entry>
</row>
<row>
<entry>
<literal><function>pg_total_relation_size</function>(<type>regclass</type>)</literal>
</entry>
<entry><type>bigint</type></entry>
<entry>
Total disk space used by the table with the specified OID or name,
including indexes and <acronym>TOAST</> data
</entry>
</row>
</tbody>
</tgroup>
</table>
@ -13310,6 +13337,26 @@ postgres=# SELECT * FROM pg_xlogfile_name_offset(pg_stop_backup());
data value.
</para>
<para>
<function>pg_total_relation_size</> accepts the OID or name of a
table or toast table, and returns the total on-disk space used for
that table, including all associated indexes. This function is
equivalent to <function>pg_table_size</function>
<literal>+</> <function>pg_indexes_size</function>.
</para>
<para>
<function>pg_table_size</> accepts the OID or name of a table and
returns the disk space needed for that table, exclusive of indexes.
(TOAST space, free space map, and visibility map are included.)
</para>
<para>
<function>pg_indexes_size</> accepts the OID or name of a table and
returns the total disk space used by all the indexes attached to that
table.
</para>
<para>
<function>pg_database_size</function> and <function>pg_tablespace_size</>
accept the OID or name of a database or tablespace, and return the total
@ -13318,14 +13365,17 @@ postgres=# SELECT * FROM pg_xlogfile_name_offset(pg_stop_backup());
<para>
<function>pg_relation_size</> accepts the OID or name of a table, index or
toast table, and returns the size in bytes. Specifying
toast table, and returns the on-disk size in bytes. Specifying
<literal>'main'</literal> or leaving out the second argument returns the
size of the main data fork of the relation. Specifying
<literal>'fsm'</literal> returns the size of the
Free Space Map (see <xref linkend="storage-fsm">) associated with the
relation. Specifying <literal>'vm'</literal> returns the size of the
Visibility Map (see <xref linkend="storage-vm">) associated with the
relation.
relation. Note that this function shows the size of only one fork;
for most purposes it is more convenient to use the higher-level
functions <function>pg_total_relation_size</> or
<function>pg_table_size</>.
</para>
<para>
@ -13334,12 +13384,6 @@ postgres=# SELECT * FROM pg_xlogfile_name_offset(pg_stop_backup());
appropriate.
</para>
<para>
<function>pg_total_relation_size</> accepts the OID or name of a
table or toast table, and returns the size in bytes of the data
and all associated indexes and toast tables.
</para>
<para>
The functions shown in <xref
linkend="functions-admin-genfile"> provide native access to

146
src/backend/utils/adt/dbsize.c
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@ -5,7 +5,7 @@
* Copyright (c) 2002-2010, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/dbsize.c,v 1.26 2010/01/12 02:42:52 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/dbsize.c,v 1.27 2010/01/19 05:50:18 tgl Exp $
*
*/
@ -246,7 +246,7 @@ pg_tablespace_size_name(PG_FUNCTION_ARGS)
/*
* calculate size of a relation
* calculate size of (one fork of) a relation
*/
static int64
calculate_relation_size(RelFileNode *rfn, ForkNumber forknum)
@ -302,54 +302,148 @@ pg_relation_size(PG_FUNCTION_ARGS)
PG_RETURN_INT64(size);
}
/*
* Compute the on-disk size of files for the relation according to the
* stat function, including heap data, index data, and toast data.
* Calculate total on-disk size of a TOAST relation, including its index.
* Must not be applied to non-TOAST relations.
*/
static int64
calculate_total_relation_size(Oid Relid)
calculate_toast_table_size(Oid toastrelid)
{
Relation heapRel;
Oid toastOid;
int64 size;
ListCell *cell;
int64 size = 0;
Relation toastRel;
Relation toastIdxRel;
ForkNumber forkNum;
heapRel = relation_open(Relid, AccessShareLock);
toastOid = heapRel->rd_rel->reltoastrelid;
toastRel = relation_open(toastrelid, AccessShareLock);
/* Get the heap size */
size = 0;
/* toast heap size, including FSM and VM size */
for (forkNum = 0; forkNum <= MAX_FORKNUM; forkNum++)
size += calculate_relation_size(&(heapRel->rd_node), forkNum);
size += calculate_relation_size(&(toastRel->rd_node), forkNum);
/* Include any dependent indexes */
if (heapRel->rd_rel->relhasindex)
/* toast index size, including FSM and VM size */
toastIdxRel = relation_open(toastRel->rd_rel->reltoastidxid, AccessShareLock);
for (forkNum = 0; forkNum <= MAX_FORKNUM; forkNum++)
size += calculate_relation_size(&(toastIdxRel->rd_node), forkNum);
relation_close(toastIdxRel, AccessShareLock);
relation_close(toastRel, AccessShareLock);
return size;
}
/*
* Calculate total on-disk size of a given table,
* including FSM and VM, plus TOAST table if any.
* Indexes other than the TOAST table's index are not included.
*
* Note that this also behaves sanely if applied to an index or toast table;
* those won't have attached toast tables, but they can have multiple forks.
*/
static int64
calculate_table_size(Oid relOid)
{
List *index_oids = RelationGetIndexList(heapRel);
int64 size = 0;
Relation rel;
ForkNumber forkNum;
rel = relation_open(relOid, AccessShareLock);
/*
* heap size, including FSM and VM
*/
for (forkNum = 0; forkNum <= MAX_FORKNUM; forkNum++)
size += calculate_relation_size(&(rel->rd_node), forkNum);
/*
* Size of toast relation
*/
if (OidIsValid(rel->rd_rel->reltoastrelid))
size += calculate_toast_table_size(rel->rd_rel->reltoastrelid);
relation_close(rel, AccessShareLock);
return size;
}
/*
* Calculate total on-disk size of all indexes attached to the given table.
*
* Can be applied safely to an index, but you'll just get zero.
*/
static int64
calculate_indexes_size(Oid relOid)
{
int64 size = 0;
Relation rel;
rel = relation_open(relOid, AccessShareLock);
/*
* Aggregate all indexes on the given relation
*/
if (rel->rd_rel->relhasindex)
{
List *index_oids = RelationGetIndexList(rel);
ListCell *cell;
foreach(cell, index_oids)
{
Oid idxOid = lfirst_oid(cell);
Relation iRel;
Relation idxRel;
ForkNumber forkNum;
iRel = relation_open(idxOid, AccessShareLock);
idxRel = relation_open(idxOid, AccessShareLock);
for (forkNum = 0; forkNum <= MAX_FORKNUM; forkNum++)
size += calculate_relation_size(&(iRel->rd_node), forkNum);
size += calculate_relation_size(&(idxRel->rd_node), forkNum);
relation_close(iRel, AccessShareLock);
relation_close(idxRel, AccessShareLock);
}
list_free(index_oids);
}
/* Recursively include toast table (and index) size */
if (OidIsValid(toastOid))
size += calculate_total_relation_size(toastOid);
relation_close(rel, AccessShareLock);
relation_close(heapRel, AccessShareLock);
return size;
}
Datum
pg_table_size(PG_FUNCTION_ARGS)
{
Oid relOid = PG_GETARG_OID(0);
PG_RETURN_INT64(calculate_table_size(relOid));
}
Datum
pg_indexes_size(PG_FUNCTION_ARGS)
{
Oid relOid = PG_GETARG_OID(0);
PG_RETURN_INT64(calculate_indexes_size(relOid));
}
/*
* Compute the on-disk size of all files for the relation,
* including heap data, index data, toast data, FSM, VM.
*/
static int64
calculate_total_relation_size(Oid Relid)
{
int64 size;
/*
* Aggregate the table size, this includes size of
* the heap, toast and toast index with free space
* and visibility map
*/
size = calculate_table_size(Relid);
/*
* Add size of all attached indexes as well
*/
size += calculate_indexes_size(Relid);
return size;
}

4
src/include/catalog/catversion.h
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@ -37,7 +37,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.574 2010/01/17 22:56:23 tgl Exp $
* $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.575 2010/01/19 05:50:18 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -53,6 +53,6 @@
*/
/* yyyymmddN */
#define CATALOG_VERSION_NO 201001171
#define CATALOG_VERSION_NO 201001181
#endif

10
src/include/catalog/pg_proc.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/catalog/pg_proc.h,v 1.562 2010/01/15 09:19:07 heikki Exp $
* $PostgreSQL: pgsql/src/include/catalog/pg_proc.h,v 1.563 2010/01/19 05:50:18 tgl Exp $
*
* NOTES
* The script catalog/genbki.pl reads this file and generates .bki
@ -3702,13 +3702,17 @@ DESCR("total disk space usage for the specified database");
DATA(insert OID = 2168 ( pg_database_size PGNSP PGUID 12 1 0 0 f f f t f v 1 0 20 "19" _null_ _null_ _null_ _null_ pg_database_size_name _null_ _null_ _null_ ));
DESCR("total disk space usage for the specified database");
DATA(insert OID = 2325 ( pg_relation_size PGNSP PGUID 14 1 0 0 f f f t f v 1 0 20 "2205" _null_ _null_ _null_ _null_ "select pg_catalog.pg_relation_size($1, ''main'')" _null_ _null_ _null_ ));
DESCR("disk space usage for the specified table or index");
DESCR("disk space usage for the main fork of the specified table or index");
DATA(insert OID = 2332 ( pg_relation_size PGNSP PGUID 12 1 0 0 f f f t f v 2 0 20 "2205 25" _null_ _null_ _null_ _null_ pg_relation_size _null_ _null_ _null_ ));
DESCR("disk space usage for the specified fork of a table or index");
DATA(insert OID = 2286 ( pg_total_relation_size PGNSP PGUID 12 1 0 0 f f f t f v 1 0 20 "2205" _null_ _null_ _null_ _null_ pg_total_relation_size _null_ _null_ _null_ ));
DESCR("total disk space usage for the specified table and associated indexes and toast tables");
DESCR("total disk space usage for the specified table and associated indexes");
DATA(insert OID = 2288 ( pg_size_pretty PGNSP PGUID 12 1 0 0 f f f t f v 1 0 25 "20" _null_ _null_ _null_ _null_ pg_size_pretty _null_ _null_ _null_ ));
DESCR("convert a long int to a human readable text using size units");
DATA(insert OID = 2997 ( pg_table_size PGNSP PGUID 12 1 0 0 f f f t f v 1 0 20 "2205" _null_ _null_ _null_ _null_ pg_table_size _null_ _null_ _null_ ));
DESCR("disk space usage for the specified table, including TOAST, free space and visibility map");
DATA(insert OID = 2998 ( pg_indexes_size PGNSP PGUID 12 1 0 0 f f f t f v 1 0 20 "2205" _null_ _null_ _null_ _null_ pg_indexes_size _null_ _null_ _null_ ));
DESCR("disk space usage for all indexes attached to the specified table");
DATA(insert OID = 2316 ( postgresql_fdw_validator PGNSP PGUID 12 1 0 0 f f f t f i 2 0 16 "1009 26" _null_ _null_ _null_ _null_ postgresql_fdw_validator _null_ _null_ _null_));

4
src/include/utils/builtins.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.343 2010/01/02 16:58:10 momjian Exp $
* $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.344 2010/01/19 05:50:18 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -433,6 +433,8 @@ extern Datum pg_database_size_name(PG_FUNCTION_ARGS);
extern Datum pg_relation_size(PG_FUNCTION_ARGS);
extern Datum pg_total_relation_size(PG_FUNCTION_ARGS);
extern Datum pg_size_pretty(PG_FUNCTION_ARGS);
extern Datum pg_table_size(PG_FUNCTION_ARGS);
extern Datum pg_indexes_size(PG_FUNCTION_ARGS);
/* genfile.c */
extern Datum pg_stat_file(PG_FUNCTION_ARGS);