BUT after clustering triples according to an index on att1:



select relname, relpages from pg_class ;
             relname             | relpages
---------------------------------+----------
 triples                         |      142  (8KB/buffer)

142 * 8 * 1024 = 1,163,264 Bytes


Is there any compression or what?

Yes, there is:

http://www.postgresql.org/docs/8.0/interactive/storage-toast.html

Chris

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