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http://www.youtube.com/watch?annotation_id=channel%3A96e95aa8-18!-""c-83b8-

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7A* AA* ;2he inde0 u(ed depend( on the

optimiBe& u(ed o& the databa(e (y(tem. Cou (hould the&eo&e chec

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;t (uppo&t( the th&ee &elational ope&ato&(: )oin p&o)ection and

(election. nly table( o type t&an(pa&ent a&e allowed o& thi(

type o 'iew.

*&o)ection 'iew. >hi( type allow( you to (upp&e(( (ome ield(

&om the di(play in a t&an(pa&ent table. >he p&o)ection 'iew i(

deined u(in only the &elational ope&ato& p&o)ection. pdatein(e&t delete and (elect ope&ation( can be pe&o&med.

- 7t&uctu&e( a&e 'i&tual table( that a&e made up o (e'e&al table(.

http://www.youtube.com/watch?annotation_id=channel%3A96e95aa8-1847-224c-83b8-e0cd302e2&feature=iv&src_vid=2vwjP7QX_NU&v=qxW_DGFpJnkhttp://www.youtube.com/watch?annotation_id=channel%3A96e95aa8-1847-224c-83b8-e0cd302e2&feature=iv&src_vid=2vwjP7QX_NU&v=qxW_DGFpJnkhttp://www.youtube.com/user/pcmoxon/videoshttp://www.youtube.com/watch?annotation_id=channel%3A96e95aa8-1847-224c-83b8-e0cd302e2&feature=iv&src_vid=2vwjP7QX_NU&v=qxW_DGFpJnkhttp://www.youtube.com/watch?annotation_id=channel%3A96e95aa8-1847-224c-83b8-e0cd302e2&feature=iv&src_vid=2vwjP7QX_NU&v=qxW_DGFpJnkhttp://www.youtube.com/user/pcmoxon/videos

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7t&uctu&e( a&e compa&able with table( o type ;>>A inte&nal

7A* table(.

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po((ible with the 7A* help and cannot be (een with eithe& the

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4 unction ey.

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othe& (pecial cu(tomiBin t&an(action(.

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&antin the inte&ity and con(i(tency o data. ;n the 7A* J/3(y(tem thi( (ynch&oniBation method o& u(e& acce(( to data i( built

on a datalocin mechani(m by the deinition and u(e o locob)ect( o'e& table &eco&d(.

>he loc( a&e e(tabli(hed and &elea(ed by callin unction module(

which a&e automatically ene&ated when deinin the loc ob)ect( inthe AA* dictiona&y. >hi( (ynch&oniBation (y(tem i( independent o

the locin mechani(m u(ed by the unde&lyin 2I7. >hi( (ection

int&oduce( how loc ob)ect( a&e c&eated modiied and deleted with

(ome ea(y e0ample(.

H&eatin Goc b)ect(. A( p&e'iou(ly int&oduced a loc ob)ect i( a

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dictiona&y ob)ect o the type a&eate. A loc ob)ect deinition then

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loc ob)ect &eui&e( the ollowin (tep(:

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". Hhoo(in the (econda&y table( (electin the a&ument( andlocin type

3. Acti'atin the loc ob)ect(.