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SELECT pg_size_pretty(pg_database_size('somedatabase')) As fulldbsize
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SELECT pg_size_pretty(pg_total_relation_size('someschema.sometable')) As fulltblsize, pg_size_pretty(pg_relation_size('someschema.sometable')) As justthetblsize
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http://www.postgresonline.com/journal/index.php?/archives/110-Determining-size-of-database,-schema,-tables,-and-geometry.html
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General Overview
FeatureSQL Server 2008 (RC0)MySQL 5.1/6PostgreSQL 8.3/PostGIS 1.3/1.4
OS
Windows XP, Windows Vista, Windows 2003, Windows 2008
Windows XP, Windows Vista, (haven't tested on 2008), Linux, Unix, Mac
Windows 2000+ (including Vista and 2003, haven't tested on 2008), Linux, Unix, Ma ......
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