About database modeling

hi all,
I wonder if there is a forum dedicated to database modeling (I don´t mean a forum about sql syntax but a forum that discusses about how to model relationships between entities and all that stuff)
I know this forum has nothing to do with database modeling, so my intent is not to post any question about db modeling but just to find out if there is a forum dedicated to it anywhere on the web.
If everybody in this forum is researching about JDBC then some of you may know about such forum over the web.
Any hints will be welcome!
tnx!
Edited by: charllescuba1008 on Mar 15, 2010 1:03 PM

jschell,
the url you provided talks about OO modeling and this kind of modeling is related to DB modeling. It is a helpful forum.
I am also considering visiting mysql and other database vendors websites to find out more specialized forums but only after i have a look at the forum you suggested!
thanks for your reply!

Similar Messages

Anyone know anything about transistor model creation?

Although it was rather difficult, I've managed to get what may be half decent parameters into a 2n3055 model I'm trying to build. (I can never find the famous ".cir" model for anything.) The main place where I had zilch was input capacitance. So, since I started with the 2n2222's numbers, I just left them there.
I droped the "component" in a simple circuit, but clearly my pin mapping is hosed up. Hence, this leads to my first question.
I do not understand what "q%p %tB %tC %tE %m" is or how it maps to my symbol (an NPN transistor). Does anyone out there have a clue?
And yes, before you say it to me, yes, yes, yes, I did do the tutorial that had me follow the bouncing ball and create a programmable gain amp being promoted by Texas Instruments. But what does it do for me in trying to build a well-known transistor's model??
Also, as I briefly mentioned before, does anyone out there know where this great repository of *.cir models is? One would think that as common as a 2n3055 is, there most certainly is a 2n3055.cir out there somewhere, but I haven't found it.
Incidentally, I've found these, but I haven't a clue as to how to make them work for me:
----- model 1 -----
*2N3055
*Si 115W 70V 15A 20kHz pkg:TO-3 3,2,1
.MODEL 2N3055 NPN(IS=4.66E-12 BF=360 VAF=100 IKF=0.25 ISE=3.339E-11
+ BR=2 ISC=5E-9 RB=3 IRB=0.001 RBM=0.4 RC=0.04 CJE=5.802E-10 VJE=1.2
+ MJE=0.45 TF=8E-8 XTF=1 ITF=3 PTF=120 CJC=2.121E-10 MJC=0.4 TR=2.55E-6
+ XTB=1)
---- model 2 -----
*.model MJE3055 ako:NSC_4A NPN() ; case Mot 90 (s)
.MODEL MJE3055 NPN(Is=457.5f Xti=3 Eg=1.11 Vaf=50 Bf=156.7 Ise=1.346p Ne=1.34
+ Ikf=3.296 Nk=.5961 Xtb=2.2 Br=7.639 Isc=604.1f Nc=2.168
+ Ikr=8.131m Rc=91.29m Cjc=278.7p Mjc=.385 Vjc=.75 Fc=.5 Cje=433p
+ Mje=.5 Vje=.75 Tr=1.412u Tf=37.34n Itf=35.68 Xtf=1.163 Vtf=10
+ Rb=.1)
And this one's a real beaut...
*      Model Generated by MODPEX     *
*Copyright(c) Symmetry Design Systems*
*         All Rights Reserved        *
*    UNPUBLISHED LICENSED SOFTWARE   *
*   Contains Proprietary Information *
*      Which is The Property of      *
*     SYMMETRY OR ITS LICENSORS      *
*    Modeling services provided by   *
* Interface Technologies www.i-t.com *
.MODEL Qmje3055t npn
+IS=1.92238e-13 BF=327.43 NF=0.85 VAF=36.105
+IKF=0.620037 ISE=1.4602e-10 NE=1.50926 BR=0.654697
+NR=0.935367 VAR=361.05 IKR=6.20037 ISC=6.85154e-12
+NC=2.96871 RB=16.05 IRB=0.1 RBM=0.161446
+RE=0.000602331 RC=0.0632768 XTB=0.943656 XTI=1.12302
+EG=1.05 CJE=9.23675e-08 VJE=0.506151 MJE=0.607139
+TF=1e-08 XTF=1.35736 VTF=0.997047 ITF=0.999796
+CJC=5e-10 VJC=0.400198 MJC=0.410184 XCJC=0.803125
+FC=0.658133 CJS=0 VJS=0.75 MJS=0.5
+TR=1e-07 PTF=0 KF=0 AF=1
* Model generated on Jan 18, 2004
* Model format: PSpice
I guess what I'm asking is has anyone out there successfully taken a NON *.cir definition and created a fairly well working transistor model, and will that person please be so kind as to help me to understand how to do it for myself?
I swear NI/Multisim are shooting themselves in the foot by not making user requested Multisim models available for a fee. They'd make soooo much money. Moreover, by only offering a scant few models, maybe, just maybe, their starting software price might be affordable to, oh, most people who can't access corporate funding.
I swear I'll pay a flat fee of $20 to anyone who will sell me a working Multisim model for any discrete component when I need it. One of the biggest hurdles of Multisim is producing functioning models. There is a tremendous business opportunity in producing working Multisim models, and it is only a matter of time until some entrepreneur out there cashes in on it. If NI/Multisim doesn't have the brains to figure this out, I'll bet somebody else out there does. For I have yet to have a model from a manufacturer work in Multisim, much less painlessly be transferred into it. This 2n3055/2955 modelwas tried by me nearly a year ago, but I eventually had to give up. ...and yes, I contacted technical support. Oh boy was that a bad move! ...but that's a story for another time.
Message Edited by Euler's Identity on 10-28-2007 11:30 AM

I am only going to make one comment and I will leave the rest to someone with more experience on the model creation end of things. I am interested in that as much as you are since I have tried and and just couldn't figure it out and finally gave up on it.
My comment is about the model making business as you describe it. There are companies out there that already provide this service. I do not know what prices they charge for their services, but a Google search will pop up quite of few of them. A person would have to check on pricing and all the rest of the details concerning this, but they are out there.
I want to add that Multisim used to have a partnership with Edaparts.com to supply model information and footprints for free. When Edaparts became a portion of Partsminer.com this freebie ended and they now charge a subscription fee for this service. That really fudged things up in my opinion. Anyway, I thought I would let you know this if you didn't already and maybe you might be interested in checking it out.
Message Edited by lacy on 10-28-2007 12:30 PM
Kittmaster's Component Database
http://ni.kittmaster.com
Have a Nice Day

Common database modelling practice

one can easily see in DB developer/programmer job advertisements such requirement as database modelling experience/skills - what does it mean? What tools should I know (thirdparty or Oracle?)? I have heard about UML profile for DB modelling - how far it is accepted in daily practice? Besides - should I know some numerical methods (e.g. - try to compute quantities as expected transaction amount and relevant impact of indices etc. on performance... - how far should I be ready to go - as I can guess - the great math can be emplyed here - however - it seems not to be common in daily practice?)?

DB Modeling at its core implies knowledge of table design/normalization best practices. Basically, can you take user requirements of a system and turn that into a properly normalized database diagram. Do some research on Database Normalization and creating Entity Relationship diagrams (ERDs)

About 3d Modelling?

Hi there ?
I am really in trouble with a subject about 3d modelling!
As a graduate-project i am given a programme which will ue the sound analyze first and make the 3d man model do the appropriate thing related to the sound.
To give an example ;
1- You will press the "Space" button to activate sound-command-recording , and then you will get the sound into a buffer
2- After that , that sound will be analyzed and compared from the sound database like "move , stop , etc."
3 - Finally , if the sound command is appropriate , the 3d model will behave as told in the sound-command?
CAN I USE "poser5" or such kind of a programme for the 3D HUMAN MODEL ? Are they usable in JAVA^3D?
is this possible? of course it is , but i mean , how hard will it be for a programmer "well-experienced" in java (Socket programming , swing etc) but who have never dealed with 3d thing?
Or do you have any example like this?
Thank you a lot?

You can create models in any application for which a Loader exists. Loading a model into Java3D is trivially simple. Read the tutorials.
List of loaders here: http://www.j3d.org/utilities/loaders.html

Spatial database model design guidelines?

Are there public guidelines on how to design a Spatial Database
Model?
i.e.
- is it better to have one table of geometries (elements) or is
it better to have many?
- is it better to store structured data (alphanumeric) in the
same table with spatial data or is it better to reference them
with foreign keys?
- etc
I guess all I need is some kind of methodology for building a
spatial model. Is there anything like this available?
Regards

Hi Pablo,
From a database design perspective, spatial data should be
modeled in the same way other data is modeled. For instance, if
you have river data that has 1 row in a database for every river,
then you might add another column in the same table stored with
the other information about the river that includes the location
information about the river. The same would be true of other
information. For instance, if you wanted to store the location
of all of the customers in your customers table, it is simple
another column in the customers table.
<< - is it better to have one table of geometries (elements) or
is it better to have many? >>
So geometries are just column information like other column
information that you store in a table. There shouldn't be
separate tables that hold only geometry information.
<< - is it better to store structured data (alphanumeric) in the
same table with spatial data or is it better to reference them
with foreign keys? >>
Treat spatial data the same way from a design standpoint as other
data.
Hope this helps.
Dan

Sql server will not start - Database 'model' cannot be opened. It is in the middle of a restore.

Sql server service will not start after server reboot:
2009-08-13 14:15:43.94 spid7s      SQL Trace ID 1 was started by login "sa".
2009-08-13 14:15:43.97 spid7s      Starting up database 'mssqlsystemresource'.
2009-08-13 14:15:43.97 spid7s      The resource database build version is 10.00.1600. This is an informational message only. No user action is required.
2009-08-13 14:15:44.30 Server      A self-generated certificate was successfully loaded for encryption.
2009-08-13 14:15:44.30 spid7s      Server name is 'WIN-37R9WFWAJIB\MSDB1'. This is an informational message only. No user action is required.
2009-08-13 14:15:44.32 spid10s     Starting up database 'model'.
2009-08-13 14:15:44.32 Server      Server is listening on [ 'any' <ipv6> 49167].
2009-08-13 14:15:44.33 Server      Server is listening on [ 'any' <ipv4> 49167].
2009-08-13 14:15:44.33 Server      Server local connection provider is ready to accept connection on [ \\.\pipe\SQLLocal\MSDB1 ].
2009-08-13 14:15:44.33 Server      Server named pipe provider is ready to accept connection on [ \\.\pipe\sql\query ].
2009-08-13 14:15:44.35 spid10s     The database 'model' is marked RESTORING and is in a state that does not allow recovery to be run.
2009-08-13 14:15:44.38 Server      Server is listening on [ ::1 <ipv6> 49168].
2009-08-13 14:15:44.38 Server      Server is listening on [ 127.0.0.1 <ipv4> 49168].
2009-08-13 14:15:44.38 Server      Dedicated admin connection support was established for listening locally on port 49168.
2009-08-13 14:15:44.39 spid10s     Error: 927, Severity: 14, State: 2.
2009-08-13 14:15:44.39 spid10s     Database 'model' cannot be opened. It is in the middle of a restore.
2009-08-13 14:15:44.49 spid10s     Could not create tempdb. You may not have enough disk space available. Free additional disk space by deleting other files on the tempdb drive and then restart SQL Server. Check for additional errors in the event log that may indicate why the tempdb files could not be initialized.
2009-08-13 14:15:44.50 spid10s     SQL Trace was stopped due to server shutdown. Trace ID = '1'. This is an informa
there is plenty of room on the server, so i dont think its a disk space issue. i am able to start the service as such:
C:\Users\Administrator>net start MSSQL$MSDB1 /c /m /T3608
The SQL Server (MSDB1) service is starting.
The SQL Server (MSDB1) service was started successfully
sqlcmd -e
1> select name, status from sysdatabases;
2> go
select name, status from sysdatabases;
name
                                                 status
master
                                                       65544
tempdb
                                                       65544
model
                                                       65568
msdb
                                                  1073807368
SS_DBA_Dashboard
                                                  1073807368
(5 rows affected)
model is in RESTORING state and I dont know how to fix it. I am running simple backups, so I have a somewhat recent backup of model.bak but when I attempt to restore it I get an error:
1> restore database model
2> go
restore database model
Msg 3112, Level 16, State 1, Server WIN-37R9WFWAJIB\MSDB1, Line 1
Cannot restore any database other than master when the server is in single user
mode.
Msg 3013, Level 16, State 1, Server WIN-37R9WFWAJIB\MSDB1, Line 1
RESTORE DATABASE is terminating abnormally.
other forums suggest manually updating the status column but i dont know if my syntax is wrong or it just cant be done in sql server 2008:
1> begin transaction
2> update sysdatabases set status=16 where name='model'
3> ;
4> go
begin transaction
update sysdatabases set status=16 where name='model'
Msg 4406, Level 16, State 1, Server WIN-37R9WFWAJIB\MSDB1, Line 2
Update or insert of view or function 'sysdatabases' failed because it contains a
derived or constant field.
1>
yet another forum suggested taking a cleanly shut down model.mdf and model.ldf from another sql server 2008 instance and placing those in the data directory while moving the 'restoring' ones to a backup location. this didnt work either. any help is appreciated im new to sql server and this is very frustrating! thanks in advance!

I have the same issue on SQL Server 2008R2, after a server reboot, but none of the NET START commands or command line attempts are successful to start the Service.
NET START command results in "Access Denied" "System Error 5" and the Command line attempts result in
Server      Error: 17058, Severity: 16, State: 1.
Server      initerrlog: Could not open error log file ''.
Any help?
SQL Error log file:
2011-03-29 16:50:49.40 Server      (c) Microsoft Corporation.
2011-03-29 16:50:49.40 Server      All rights reserved.
2011-03-29 16:50:49.40 Server      Server process ID is 7292.
2011-03-29 16:50:49.40 Server      System Manufacturer: 'Dell Inc.', System Model: 'PowerEdge T710'.
2011-03-29 16:50:49.40 Server      Authentication mode is MIXED.
2011-03-29 16:50:49.40 Server      Logging SQL Server messages in file 'E:\MSSQL\MSSQL10_50.MSSQLSERVER\MSSQL\Log\ERRORLOG'.
2011-03-29 16:50:49.40 Server      This instance of SQL Server last reported using a process ID of 7448 at 3/29/2011 4:30:06 PM (local) 3/29/2011 8:30:06 PM (UTC). This is an informational message only; no user action is required.
2011-03-29 16:50:49.40 Server      Registry startup parameters:
-d E:\MSSQL\MSSQL10_50.MSSQLSERVER\MSSQL\DATA\master.mdf
-e E:\MSSQL\MSSQL10_50.MSSQLSERVER\MSSQL\Log\ERRORLOG
-l E:\MSSQL\MSSQL10_50.MSSQLSERVER\MSSQL\DATA\mastlog.ldf
-T 4616
2011-03-29 16:50:49.42 Server      SQL Server is starting at normal priority base (=7). This is an informational message only. No user action is required.
2011-03-29 16:50:49.42 Server      Detected 24 CPUs. This is an informational message; no user action is required.
2011-03-29 16:50:49.84 Server      Using dynamic lock allocation. Initial allocation of 2500 Lock blocks and 5000 Lock Owner blocks per node. This is an informational message only. No user action is required.
2011-03-29 16:50:49.84 Server      Lock partitioning is enabled. This is an informational message only. No user action is required.
2011-03-29 16:50:49.86 Server      Node configuration: node 0: CPU mask: 0x0000000000fff000:0 Active CPU mask: 0x0000000000fff000:0. This message provides a description of the NUMA configuration for this computer. This is an informational
message only. No user action is required.
2011-03-29 16:50:49.86 Server      Node configuration: node 1: CPU mask: 0x0000000000000fff:0 Active CPU mask: 0x0000000000000fff:0. This message provides a description of the NUMA configuration for this computer. This is an informational
message only. No user action is required.
2011-03-29 16:50:49.89 spid9s      Starting up database 'master'.
2011-03-29 16:50:49.95 spid9s      CHECKDB for database 'master' finished without errors on 2011-03-18 08:46:34.257 (local time). This is an informational message only; no user action is required.
2011-03-29 16:50:49.95 spid9s      FILESTREAM: effective level = 0, configured level = 0, file system access share name = 'MSSQLSERVER'.
2011-03-29 16:50:49.97 spid9s      SQL Trace ID 1 was started by login "sa".
2011-03-29 16:50:49.97 spid9s      Starting up database 'mssqlsystemresource'.
2011-03-29 16:50:49.99 spid9s      The resource database build version is 10.50.1600. This is an informational message only. No user action is required.
2011-03-29 16:50:50.20 spid13s     Starting up database 'model'.
2011-03-29 16:50:50.20 spid9s      Server name is 'XXXX'. This is an informational message only. No user action is required.
2011-03-29 16:50:50.21 Server      The certificate [Cert Hash(sha1) "C41DC20703F049763778AC2842C3C8A3A2C6EED4"] was successfully loaded for encryption.
2011-03-29 16:50:50.21 Server      Server is listening on [ 'any' <ipv6> 1433].
2011-03-29 16:50:50.21 Server      Server is listening on [ 'any' <ipv4> 1433].
2011-03-29 16:50:50.21 Server      Server local connection provider is ready to accept connection on [
\\.\pipe\SQLLocal\MSSQLSERVER ].
2011-03-29 16:50:50.21 Server      Server named pipe provider is ready to accept connection on [
\\.\pipe\sql\query ].
2011-03-29 16:50:50.21 Server      Server is listening on [ ::1 <ipv6> 1434].
2011-03-29 16:50:50.21 spid13s     The database 'model' is marked RESTORING and is in a state that does not allow recovery to be run.
2011-03-29 16:50:50.21 Server      Server is listening on [ 127.0.0.1 <ipv4> 1434].
2011-03-29 16:50:50.21 spid13s     Error: 927, Severity: 14, State: 2.
2011-03-29 16:50:50.21 spid13s     Database 'model' cannot be opened. It is in the middle of a restore.
2011-03-29 16:50:50.21 Server      Dedicated admin connection support was established for listening locally on port 1434.
2011-03-29 16:50:50.22 spid13s     Could not create tempdb. You may not have enough disk space available. Free additional disk space by deleting other files on the tempdb drive and then restart SQL Server. Check for additional errors in
the event log that may indicate why the tempdb files could not be initialized.
2011-03-29 16:50:50.22 spid13s     SQL Trace was stopped due to server shutdown. Trace ID = '1'. This is an informational message only; no user action is required.

Insert XML file into Relational database model without using XMLTYPE tables

Dear all,
How can I store a known complex XML file into an existing relational database WITHOUT using xmltypes in the database ?
I read the article on DBMS_XMLSTORE. DBMS_XMLSTORE indeed partially bridges the gap between XML and RDBMS to a certain extent, namely for simply structured XML (canonical structure) and simple tables.
However, when the XML structure will become arbitrary and rapidly evolving, surely there must be a way to map XML to a relational model more flexibly.
We work in a java/Oracle10 environment that receives very large XML documents from an independent data management source. These files comply with an XML schema. That is all we know. Still, all these data must be inserted/updated daily in an existing relational model. Quite an assignment isn't it ?
The database does and will not contain XMLTYPES, only plain RDBMS tables.
Are you aware of a framework/product or tool to do what DBMS_XMLSTORE does but with any format of XML file ? If not, I am doomed.
Constraints : Input via XML files defined by third party
Storage : relational database model with hundreds of tables and thousands of existing queries that can not be touched. The model must not be altered.
Target : get this XML into the database on a daily basis via an automated process.
Cheers.
Luc.

Luc,
your Doomed !
If you would try something like DBMS_XMLSTORE, you probably would be into serious performance problems in your case, very fast, and it would be very difficult to manage.
If you would use a little bit of XMLType stuff, you would be able to shred the data into the relational model very fast and controlable. Take it from me, I am one of those old geezers like Mr. Tom Kyte way beyond 40 years (still joking). No seriously. I started out as a classical PL/SQL, Forms Guy that switched after two years to become a "DBA 1.0" and Mr Codd and Mr Date were for years my biggest hero's. I have the utmost respect for Mr. Tom Kyte for all his efforts for bringing the concepts manual into the development world. Just to name some off the names that influenced me. But you will have to work with UNSTRUCTURED data (as Mr Date would call it). 80% of the data out there exists off it. Stuff like XMLTABLE and XML VIEWs bridge the gap between that unstructured world and the relational world. It is very doable to drag and drop an XML file into the XMLDB database into a XMLtype table and or for instance via FTP. From that point on it is in the database. From there you could move into relational tables via XMLTABLE methods or XML Views.
You could see the described method as a filtering option so XML can be transformed into relational data. If you don't want any XML in your current database, then create an small Oracle database with XML DB installed (if doable 11.1.0.7 regarding the best performance --> all the new fast optimizer stuff etc). Use that database as a staging area that does all the XML shredding for you into relational components and ship the end result via database links and or materialized views or other probably known methodes into your relational database that isn't allowed to have XMLType.
This way you would keep your realtional Oracle database clean and have the Oracle XML DB staging database do all the filtering and shredding into relational components.
Throwing the XML DB option out off the window beforehand would be like replacing your Mercedes with a bicycle. With both you will be able to travel the distance from Paris to Rome, but it will take you a hell of lot longer.
:-)

Explain about the Models...

Hi friends...
Can anybody explain about the models in webdynpro, and also explain about its types as well as its functions....
Thanks in advance...
GS

Hi SatishKumar,
As WD is based on the MVC paradigm models represents the backend of the this
architecture.
Now the Models can be categorized in 2 ways:
1. Adaptive and Deprecated.
2. RFC,Webservice,Bean.
Now the Adaptive models follow CMI(Common model Interface) specs.
For information on the CMI look into the documents on the SAP Netweaver Documention.
Also,the following document would give you a good idea of the same.
<a href="http://help.sap.com/javadocs/NW04S/current/cm/index.html">CMI documentation</a>
<a href="https://www.sdn.sap.comhttp://www.sdn.sap.comhttp://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/cef4f43e-0d01-0010-db84-ede25c874115">How to use CMI</a>.
This will give you sufficient information to start with the CMI.
Now for the other classification which's pretty straight:
1.WebService Model: Is like any other webservice uses SOAP request response.
<a href="https://www.sdn.sap.comhttp://www.sdn.sap.comhttp://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/900bbf94-a7a8-2910-e298-a651b4706c1e">Adaptive Web Service Model</a>
2.RFC: Is a function module made in ABAP uses JCO for interacting internally.
<a href="https://www.sdn.sap.comhttp://www.sdn.sap.comhttp://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/11c3b051-0401-0010-fe9a-9eabd9c216de">Adaptive RFC Models</a>
3.Bean Model: Java Bean Classed should follow the Java Bean specification.
<a href="/people/anilkumar.vippagunta2/blog/2005/09/02/java-bean-model-importer-in-web-dynpro Bean Model Importer in Web Dynpro</a>
Regards
Amit

How associating an XMLSchema to an XMLType Field with the database model ?

How can I precise the XMLSchema to an XMLType Field with the database model ?
I know how to do it in a SQL Syntax :
CREATE TABLE xwarehouses (
warehouse_id NUMBER,
warehouse_spec XMLTYPE)
XMLTYPE warehouse_spec STORE AS OBJECT RELATIONAL
XMLSCHEMA "http://www.oracle.com/xwarehouses.xsd"
ELEMENT "Warehouse";
, but we have decided to generate the script with the Jdeveloper database modeler tools, and we don't how to precise this with using this tools ?
Anyone could help me ?

I'm not sure that it answers your question but under the tools menu there is an option called register schema with XDB.

Where to learn about database tuning from?

Hello,
I need to learn more about database tuning - practical aspect. Are there any sites/services that could help me? I can't use production environment of course, I need to prepare my own ones (Oracle DBs on linux and windows too) and workload too. How to simulate workload from many users?
Thanks in advance for help
Aliq

How do you learn to paint? You can read every book on the subject, attend lectures by famous artists on paints and brushes and styles and what not..
None of this will turn you into an artist that can paint. Theory only goes that far.
And this is as true in performance tuning as in painting. You need to run into that brick wall called experience over and over again - and each time learn hard lessons that no theory can ever teach.
If performance tuning was that easy, we would have had fully automated tuning software in operating systems and database systems that could detect and fix all our performance woes on the fly.
Does not work like that.
Also, performance tuning is many times seen as an "after the fact" thing. Design the system. Code the software. Implement it. Then tune it.
Wrong. Also does not work like that.
Performance tuning begins at the very first workshop when brainstorming the basic design of the system. If performance and scalability are not part of that process, they cannot easily (if at all) be made to be part of the final system as a tuning exercise.
If I need to pass a single fundamental "uber-alles" principle for performance tuning - when dealing with it after the fact (as many of us do), then it is:
Identify The Problem
Do not confuse symptoms as the actual problem.
PS. Performance tuning is also many time (IMO) a situation where you have lost. Why? Because of if the code was designed and coded correctly, then there would not have been a performance issue. If the Oracle architecture was understood correctly, there would not be a problem. Which makes the advice by the other 2 posters so important. Understand Oracle. Understand how to design and code in Oracle. If done well, what is there left to performance tune?

Help with relational database model

Hi everyone,
How will a database model look like if you have one program that writes to the database and one program that reads from it. The database tables consist of customer orders.
Regards
Ardalan

Database model itself is unchanged, as far as I can see. The tables don't know how they're being used.
If you're saying that you have two apps, one that does mostly reads and another that does reads AND writes, then it's a more interesting question.
If you have a table that's mostly READs, you might want to create indexes that speed up queries.
But indexes can slow down WRITEs, because every time you add a new record the index has to be modified, too. More work for the RDBMS.
So maybe you're asking whether or not you should create a bunch of indexes for a table? Or have two tables, one for reading and another for read/write, with some kind of procedure that might update the read table from the write values on a regular schedule but off-line, like synchronizing a data cube?
Hard to tell from your OP, but it could be an interesting question. - MOD

Why won't my database model open?

Suddenly (i've been working on it a few weeks now) my database model refuses to open in JDeveloper. No error messages or anything. Dragging the model is ignored as is right clicking and choosing Open....
Any ideas?
Rakesh

Hi,
Is it possible that you could send me your project so that I can investigate? If so my email address is [email protected] Can you rename the .zip file to .zap so that it gets through the mail system.
Also can you confirm which version of JDeveloper you are using?
Was the diagram created in this release or migrated from a previous release?
What was the last sort of thing you were doing before you were unable to reopen the diagram?
Regards,
Lisa Sherriff
JDev QA

WebAPI question about Hierarchy modeling

Hi all,
I have come to a issue about Hierarchy modeling. I want to use WebAPI to drill down the query in the visual composer. And I have follow every steps mentioned in this PDF file
</people/prakash.darji/blog/2006/08/24/overcome-limitations-around-using-bi-hierarchies-in-vc-by-using-ui-elements-from-wad
Here is my webapi:
'FILTER_NODE_IOBJNM=0COUNTRY;FILTER_VALUE='&@Country_key&';FILTER_COLLAPSE= ;FILTER_IOBJNM=0COUNTRY;
CMD_1=CMD%3DDRILL_TO_LEVEL%26LEVEL%3D2%26IOBJNM%3D0COUNTRY%26DATA_PROVIDER%3DDP;'
It's really same to the webapi in the PDF file except the different characteristic. and my model structrue is also the same as that one. And I has also confirmed the displaying hierarchy is checked in the query.
The issue is that the "drill to level" part of the webapi works well, but the filter doesn't work. I have no idea why. Can anyone help me?
Regards,
Dicky

Dicky,
I struggled with this for 3 days, I understand your pain. After a deep investigation I found that my mapping was incorrect. Try this:
1) Double click on DRILLDOWN connection between output and input ports
2) Check if WEBAPI inputfield has the web api commands
3) Make sure that none of the other input fields have values set. It usually happens that when you connect the output to the input port, similar (or like) variables are mapped automatically, for example in my case, I had Org_unit mapped to @Org_unit automatically. Delete such mappings. You should have only the WEBAPI input field with an assigned value.
Hope this helps,
Kiran

Definition of database model

Hi All,
I want to create an application that stores data in three database tables. I want to create the database tables using the java dictionary. Now i'm looking for a way to define the relations between the tables to setup my database model, but using the Netweaver developer studio I cannot find any possibility to define relations there and I couldnot find any information in the sap help.
We have oracle, so we could define the relations in the database using oracle tools, but then I don't have a platform/database independend solution.
Does any have experience on this area and/or recommendation?
Regards,
Ryan

Thanks for the reply, actdi.
Initially, I had thought of learning ODI using 11g version. However, I have setup OBIA with ODI, which is using 10g. Actually my aim is to understand OBIA with ODI as well as learn ODI. Can I still install the 11g version you have recommended without de-installing 10g? If not, would the migration be easy? I am not going to run the ETL ( .... E-LT) processes, anyway, as I only intend to have a look at the OBIA Models and Projects.
Appreciate if you could please let me know.
Thanks,
Manoj.

Database model overview

Hello,
i am searching for a document
which gives an overview of the
database model (standard tables with cardinality)
in SAP R/3.
I am new in developing
and consulting and such an overview
would ease lots of tasks.
thx for helping.
regards,
Markus

Hi Markus,
Have a look at the Transaction code SD11 which will give the Application wise Data Models on which SAP was built.
Hope this helps.
Thanks
Lakshman.

About database modeling

Similar Messages

Maybe you are looking for