Creating Multiple Logical Models?

My boss wants me to model how all his APEX webbased applications interact, how they share data, by using Oracle's DataModeler software in SQL Developer environment.
So, I did a data import of the similarly named tables for each application, and each one is now its own RELATIONAL MODEL. These are just displaying as yellow entities (tables) with their corresponding column and datatypes inside.
I know to rightclick on the model in the browser to select ENGINEER TO LOGICAL MODEL, but I need to display a logical model for EACH applications related tables, but when I 'engineer to logical model' for each of the apps they all just keep adding a SINGLE logical model, when I want them to have their OWN logical model.
tl;dr: How do I create simplified logical models for seperate apps

A logical data model will help you (and other stakeholders) understand the business and data requirements (in other words, the information needs) from a business perspective, irrespective of DBMS technology. An LDM is an analysis artefact. This is great to validate your understanding and confirm with business analysts and business reps, as well as complementing with other analysis artefacts like process models. Also very helpful to see how different systems interact, and where there is commonality and/or redundancy.
A physical data model (i.e., relational), a.k.a., database design, defines and illustrates the structure of the data as they will be implemented in a database. A PDM is a design artefact, derived or transformed from the logical data model. Developers and DBAs will be your main audience.
Patrick

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Try this. Create an two aliases for the TIMES dimension (Start & End) in the Physical Layer and then remove foreign key to the "Parent" Times dimension. Create the Foreign Key in the Physical Layer to the new aliases and then create the complex joins in the BMM Layer to the new aliases as well. This will allow you to present both dates within the same table in the Presentation Layer. Not the most elegant solution but it works.

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I successfully was able to create a logical model, engineer to relational, and generate DDL from this.
However, I found after generating the DDL and attempting to run it, I received errors in creation of some tables saying "missing left parentheses."
After going back and checking, it turned out that I was somehow able to define columns of type varchar in the logical model without putting in a length for the column. Data Modeler generated the DDL for the table looking something like this:
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LOGGING ;
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Hello friends,
I have a question which I have seen various points of view. I'm hoping you might be able to give me a better insight so I can either confirm my own sanity, or accept a new paradigm shift in laying out the file system for best performance.
Here are the givens:
Unix systems (AIX, HP-UX, Solaris, and/or Linux).
Hardware RAID system on large SAN (in this case, RAID-05 striped over more than 100 physical disks).
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Each Logical Volume is also striped over at least 100 spindles (all the same spindles for each lvol).
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Oracle backups, exports, flash-back-query, etc., are on their own separate physical volume.
Oracle database files, including all tablespaces, redo logs, undo ts, temp ts, and control files are in their own separate physical volume (that is made up of logical volumes that are each striped over at least 100 physical disks (spindles).
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Does this do anything at all for performance? If the volumes are logical, then what difference would it to put them into individual logical volumes that are striped across the same one-hundred (+) disks?
Basically ALL database files are in a single physical volume (LUN), but does it help (and WHY) to break up the physical volume into several logical volumes for placing each of the individual data files (e.g., separating system ts, from sysaux, from temp, from undo, from data, from indexes, etc.) if the physical volume is created on a RAID-5 (or RAID-10) disk array on a SAN that literally spans across hundreds of high-speed disks?
If this does makes sense, why?
From a physical standpoint, there are only 4 hardware paths for each LUN, so what difference does it make to create multiple 'logical' volumes for each datafile, or for separating types of data files?
From an I/O standpoint, the multi-threading of the operating system should only be able to use the number of pathways that are capable based on the various operating system options (e.g., multicore CPUs using SMT (simultaneous multipath threading). But I believe they are still based on physical paths, not based on logical volumes.
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Thanks for your reply damorgan.
We have dual HBAs in our servers as standard equipment, along with dual controllers.
I totally agree with the idea of getting rid of RAID-5, but that is not my choice.
We have a very large (massive) data center and the decision to use RAID-5 was at the discretion of our unix team some time ago. Their idea is one-size-fits-all. When I questioned it, I was balked at. After all, what do I know? I've only been a sys admin for 10 years (but on HP-UX and Solaris, not on AIX), and I've only been an Oracle DBA for nearly 20 years.
For whatever it is worth, they also mirror their RAID-5, so in essence, it is a RAID 5-1-0 (RAID-50).
Anyway, as for the hardware paths, from my understanding, there are only 4 physical hardware paths going from the servers to the switches, to the SAN and back. Their claim (the unix team's) is that by using multiple logical volumes within a single physical volume, that it increases the number of 'threads' to pull data from the stripe. This is the part I don't understand and may be specific to AIX.
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Two years ago, I've personally set up three LUNs on a pair of Sun V480s (RAC'd) connected to a Sun Storage 3510 SAN. One LUN for Oracle binaries, one for database datafiles, and one for backups and archivelogs), and then put all my datafiles in a single logical volume on one LUN, and had fantastic performance for a very intense database that literally had 12,000 to 16,000 simultaneous active* connections using Webshere connection pools. While that was a Sun system, and now I'm dealing with an AIX P6 570 system, I can't imagine the concepts being that much different, especially when the servers are basically comparable.
Any comments or feedback appreciated.
ji li
Edited by: ji li on Jan 28, 2013 7:51 AM

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SQL Developer
Version 2.1.0.62
Build MAIN-62.61
I cannot create a logical model (Entities relations etc)
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If you're inside SQL Developer, you're in the wrong tool, as it can currently only view models.
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Hi
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zonecfg:itchyzone1> exitYou can do the above as many times as you like to create multiple logical interfaces for the zone.
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[Connected to zone 'itchyzone1' pts/4]
Last login: Mon Oct 5 22:24:15 on pts/4
Sun Microsystems Inc.   SunOS 5.10      Generic January 2005
# ifconfig -a
lo0:1: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1
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bge0:2: flags=201000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4,CoS> mtu 1500 index 2
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bge0:3: flags=201000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4,CoS> mtu 1500 index 2
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Hi,
it's not clear what are you trying to achieve:
I have approximately 2,000 column names to import into a new logical model are you trying to create attributes in logical model - you also need entities that will contain these attributes.
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Creating Multiple Logical Models?

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