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Hierarchical DB

6 replies on 1 page. Most recent reply: Oct 4, 2003 11:15 AM by David

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Thomas SMETS

Posts: 307
Nickname: tsmets
Registered: Apr, 2002

Hierarchical DB Posted: Sep 30, 2003 2:16 PM
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Dears,

I know enough of Oracle & PostgreSQL to make hierarchical queries on a DB. I was wandering if there was a free / non-free implementation of a such DB ...

Can someone point me a reference or another ?

BTW,
I browse the forge but could not find anyting like that...

Tia,

\T,


David

Posts: 150
Nickname: archangel
Registered: Jul, 2003

Re: Hierarchical DB Posted: Oct 2, 2003 7:16 AM
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What do you mean by "hierarchical"? It means something very specific in database terminology.

MySQL is an excellent, free database system.

Thomas SMETS

Posts: 307
Nickname: tsmets
Registered: Apr, 2002

Re: Hierarchical DB Posted: Oct 2, 2003 4:02 PM
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You probably know LDAP ?
That is a directory usually stored in a hierarchical way that you can access thru' a simpler query language than SQL's

Well, everybody knows relationnal databases but they are no goot at storing infos which have a structure like this one : 

           |
          / \
         /\/|\
             |\
, if you think at a telco network where trails are router on connection & vice versa with many levels
or, something better known as the familly tree, you end up with very though queries on an Oracle (look for informations on the connect by statement).

Cheers,

\T,

Joe Parks

Posts: 107
Nickname: joeparks
Registered: Aug, 2003

Re: Hierarchical DB Posted: Oct 2, 2003 5:04 PM
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> I know enough of Oracle & PostgreSQL to make hierarchical
> queries on a DB.

postgres is free

David

Posts: 150
Nickname: archangel
Registered: Jul, 2003

Re: Hierarchical DB Posted: Oct 3, 2003 6:29 AM
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A Google search of "Free LDAP" found loads including:

http://www.eudora.com/techsupport/worldmail/ldap.html

Thomas SMETS

Posts: 307
Nickname: tsmets
Registered: Apr, 2002

Re: Hierarchical DB Posted: Oct 4, 2003 12:36 AM
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Thanx guys but ...
I use already
Postgres : http://rubick.com:8002/openacs/tree_sortkey
Oracle : http://otn.oracle.com/products/oracle9i/daily/oct04.html

I wonder if LDAP is meant for that ... thought it is somehow, he ! Also there is always the OpenLDAP available upon needed !

\T,

David

Posts: 150
Nickname: archangel
Registered: Jul, 2003

Re: Hierarchical DB Posted: Oct 4, 2003 11:15 AM
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"meant for that"

What problem are you actually trying to solve?

"Hierarchical Database Systems" *do* exist, but have largely been rejected in favour of "Relational Database Systems" (although many legacy systems are still active).

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