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55 lines
1.8 KiB
Plaintext
55 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_tablespace_size(oid)
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int8 pg_relation_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, and support databases and tables. Please
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note that relation_size() only reports table file usage and not the
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space used by indexes and toast tables.
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Functions using oids are:
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SELECT pg_database_size(1); -- template1 database
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SELECT pg_tablespace_size(1663); -- pg_default tablespace
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SELECT pg_relation_size(1259); -- pg_class table size
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pg_relation_size() will report the size of the table, index and toast
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table OIDs, but they must be requested individually. To obtain the total
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size of a table including all helper files you'd have to do something
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like:
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XXX This query does not work, syntax error XXX
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SELECT pg_relation_size(cl.oid) AS tablesize,
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CASE WHEN reltoastrelid=0 THEN 0
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ELSE pg_relation_size(reltoastrelid) END AS toastsize,
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SUM(pg_relation_size(indexrelid)) AS indexsize,
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pg_size_pretty(pg_relation_size(cl.oid)
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+ pg_relation_size(reltoastrelid)
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+ SUM(pg_relation_size(indexrelid))::int8)
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AS totalsize
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FROM pg_class cl
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JOIN pg_index ON cl.oid=indrelid
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WHERE relname = 'pg_rewrite'
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GROUP BY 1,2
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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. Finally, load the functions
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into any database using dbsize.sql.
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