PGUUID FAQ

1. ԰һַ뵽uuidֶ?
	ֻҪַuuid ĸʽͿ, 򽫻ִʾ

2. ԺMSSQLеUUID?
	yes ! , һṩһЩʵõĹ(μdoc/doc.txt)

3. 4  UUIDʲô? Щֹɵ, ܱ֤Ψһ?
	1)nil uuid: 320, һ(00000000-0000-0000-0000-000000000000)
	2)time-base uuid: Time+clock+ramdom+mac(Ϥμdoc/draft-mealling-uuid-urn-00.txt), ܱ֤Ψһ
	3)Name-base uuid: 汾֧, ¸汾ṩ֧
	4)random-base uuid: (α) ɵUUID,
ֻܱ֤ڵǰΨһ

4. ΨһuuidҪ?
	ǵ, Ǳ! ɵtime-base uuid ֻڵǰϱ֤Ψһ

5. жʱ, time-base uuid ǸĿmacɵ?
	Ĭeth0. Ȼ޸, :
		$pguuid/uuid/src/def.h
		ҵ #define IF_NUMBER 0 һ
		0 eth0, ޸ĳ1 eth1 ...

		ע޸ĺҪ±, װЧ!!!

	ǿҵĽѴֵ޸ĳpostgresṩ豸

6 ֤¼Ψһķкܶ, ΪʲôҪʹuuid, ӦʲôʹUUID??
	, ȽһЩ
	
	1) uuid VS series
		serise ϵͳṩ, uuidûԶ
		uuid Ա֤ռΨһ, serise ֻܱ֤ڱΨһ
		UUIDݿ֮ĸ(replication)ʱ

	2) uuid VS OID
		OIDϵͳɵ, ָ, ֻܱ֤ݿΨһ
		UUID ǿָ: insert into <table> (id) values (newid(1))
		UUIDݿ֮ĸ(replication)ʱ

	3) uuid VS 
		Ա֤Ψһ
		ǲÿDBMSԷṩ֧
		Ƚϸ, ͨ2ϵֶ, uuidܼ,
ֻһֶ
		ͨ, uuidû, ֻһʶ!

	ļ, ǸһʹuuidĴ±׼
		ļ¼ҪռΨһʱ:
			ֻҪһûıʶֲõļ¼, ʱӦʹtime-baseuuid
			, ÷

		ļ¼֮Ҫڵǰϱ֤Ψһʱ(ǰNݿ)
			ҽʹRandom-base uuid, Ļtime-base uuid 
	
		֮, Ӧʹ serise oid ֮Ķ
