the XID question

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after i backdb->dropdb->restoredb and then vacuum analy+full -> vacuum
freeze

the XID had been increased by 4 billion in two weeks...is it noraml?

what's the definetion of XID?

" select * from mybook" SQL command also increase the XID ?

reference:
http://www.postgresql.org/docs/9.0/static/routine-vacuuming.html

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