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swapna
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Joined: 28 Nov 2005
Posts: 4
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Location: chennai
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 Posted: Wed Nov 30, 2005 11:12 pm Post subject: logical database - physical /virtual bidirectinal |
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i am going thru logical databases and found bidirectionall physicall and bidirectional virtual. i couldn't find by looking DBD, whether it has virtua or physical relation . PL. guide me
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Swapna |
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ANIL SARATHY
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Joined: 30 Aug 2005
Posts: 88
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Location: Syracuse,New york
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| Posted: Thu Dec 01, 2005 12:20 am Post subject: |
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To understand this you should know little about pointers and real and virtual logical childs
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/dfsa10f3/2.4.1.10.1?SHELF=&DT=20020905085130&
Physicall relation will have two LCHILD's in two databases. pointer = none for both lchild. RLC will not have source=
Virtual relation will have 1 LCHILd (Virtual logical child database). pointer = single or double for lchild. VLC will have source=
| Code: |
VIRTUAL:
a c
lchild b pointer=sngl/dble
(rlc) b d (vlc) source=b
PHYSICAL:
a c
lchild d
pointer=none lchild b pointer=none
b (rlc) parent= a and c d (rlc) parent = c and a
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Go thru the above link , it should clear your doubts
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Anil Sarathy |
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swapna
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Joined: 28 Nov 2005
Posts: 4
Topics: 1
Location: chennai
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| Posted: Fri Dec 02, 2005 12:32 am Post subject: |
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Anil , thanks for the link. I am able to figure it out now.
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Swapna |
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