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52 lines
1.8 KiB
Plaintext
52 lines
1.8 KiB
Plaintext
This module contains several functions that report the size of a given
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database object:
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int8 database_size(name)
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int8 relation_size(text)
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int8 pg_database_size(oid)
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int8 pg_relation_size(oid)
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int8 pg_tablespace_size(oid)
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text pg_size_pretty(int8)
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The first two functions:
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SELECT database_size('template1');
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SELECT relation_size('pg_class');
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take the name of the object (possibly schema-qualified, for relation_size),
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while these functions take object OIDs:
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SELECT pg_database_size(1); -- template1 database
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SELECT pg_relation_size(1259); -- pg_class table size
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SELECT pg_tablespace_size(1663); -- pg_default tablespace
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Please note that relation_size and pg_relation_size report only the size of
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the selected relation itself; any subsidiary indexes or toast tables are not
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counted. To obtain the total size of a table including all helper files
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you'd have to do something like:
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SELECT *,
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pg_size_pretty(tablesize+indexsize+toastsize+toastindexsize) AS totalsize
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FROM
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(SELECT pg_relation_size(cl.oid) AS tablesize,
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COALESCE((SELECT SUM(pg_relation_size(indexrelid))::bigint
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FROM pg_index WHERE cl.oid=indrelid), 0) AS indexsize,
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CASE WHEN reltoastrelid=0 THEN 0
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ELSE pg_relation_size(reltoastrelid)
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END AS toastsize,
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CASE WHEN reltoastrelid=0 THEN 0
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ELSE pg_relation_size((SELECT reltoastidxid FROM pg_class ct
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WHERE ct.oid = cl.reltoastrelid))
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END AS toastindexsize
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FROM pg_class cl
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WHERE relname = 'foo') ss;
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This sample query utilizes the helper function pg_size_pretty(int8),
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which formats the number of bytes into a convenient string using KB, MB,
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GB. It is also contained in this module.
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To install, just run make; make install. Then load the functions
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into any database using dbsize.sql.
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