Roy - This could be a good IOT candidate, but I haven't used them myself. My
suggestion would be to test it. Here is a good paper on how to decide:
http://www.peled.com/white_papers/iot.pdf
A more recent edition is available on http://www.orapub.com (free but must
register)
Dennis Williams
DBA, 80%OCP, 100% DBA
Lifetouch, Inc.
[EMAIL PROTECTED]
-----Original Message-----
Sent: Wednesday, May 28, 2003 11:45 AM
To: Multiple recipients of list ORACLE-L
Greetings all,
Say I have two main tables in a M:M relationship, and a junction table
resolving the relationship, like so:
create table staff
(staff_id number PRIMARY KEY
, name varchar2(50)
, <<other cols>>) ;
create table projects
(proj_id number PRIMARY KEY
, name varchar2(50)
, mgr_id number
, <<other cols>>) ;
create table staff_projects
(staff_id number
, proj_id number
, CONSTRAINT staff_projects_pk
PRIMARY KEY (staff_id, proj_id)
, FOREIGN KEY (staff_id) REFERENCES staff(staff_id)
, FOREIGN KEY (proj_id) REFERENCES projects(proj_id)
) ;
Queries that join staff_projects to projects to pull project info for a
given staff_id should be really fast, since staff_id is the leading column
in the index created to enforce the PK on staff_projects (right?)--and in
fact, the staff_projects table itself shouldn't need to be touched, since
all the needed info is in this index (also right?).
If I want to speed lookups of staff info for a given proj_id, I can create
another unique index on staff_projects(proj_id, staff_id). There again, the
staff_projects table shouldn't need to be touched, b/c all the info is in
the index.
At this point, it seems like the table is sort of superflous--all the info
in it is better accessible in the two indexes. If that's right--is there an
advantage in making staff_projects an index organized table?
Thanks!
-Roy
Roy Pardee
Programmer/Analyst/DBA
SWFPAC Lockheed Martin IT
Extension 8487
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