Recapturing database design using designer6i

We use designer as a tool to document our production database (basically use designer to store description for the tables and attributes). A promotion to the production database was made a while ago and we need to find a way to synchronize the repository and the production database.
Does anybody know if we recapture the database design and retrofit table -> entity, will we lose all the descriptions already stored in the repository? Or is there a better way to do the synchronization?
Thanks in advance

Please check the Cameleon Open Source project at http://www.must.de/cameleon.html if ti fits your needs.

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Why sql sever database design is used for essbas?

Hi
I am new to the Hyperion technology . i would like to know why do we use any RDBM like sql sever database design for essbase which is itself is the database.What is the main difference between these two databases?
My understanding is that Essbase act as same as SSAS for cube and dimension building.And they use database design for storing the tables and other information.
Thanks

A relational database can be used for a number of reasons with Essbase (and is required in some instances). These include
1. a repository for system tables for Shared services, EAS, Studio,EPMA, Workspace, Financial Management etc
2. A data source for loading Essbase
3. A work area for transformations

How to generate oracle sequence using Database Designer Transformer

I created Entity Relationship Diagram.I can generate Table relavant to that every entity.(using Database Design Transformer).Normaly the Database Design Transformer tries to find a suitable unique key that can be used as the primary key. If it cannot find one, it creates a surrogate primary key.it create sequence for that surrogate key.But I didn't want that.I want generate sequence only the attribute that have primary key.how can i do

So a digital pulse??

SQL Developer can be used for database design

can I use SQL Developer to design the database?

It really depends on what you mean by "can," how complex the schema design is going to be, and your comfort level.
AB is quite right to point out Oracle Designer-- that's a very powerful, very visual tool for creating physical and logical schema designs. It also has a relatively steep learning curve and a relatively large installation footprint. If you need to generate highly complex schema designs, to allow multiple modelers to work together, and you will use the tool frequently enough to justify the training time, Designer is a wonderful tool.
On the other end of the spectrum, however, it's perfectly possible to generate a schema design using SQL*Plus or SQL Developer with a white board or scratch paper nearby to help think through various issues. The tools aren't presenting you with pretty ERDs, they're not automatically translating visual representations of designs to physical implementations, etc. but it's quite possible for a human using those tools to do the translation.
Either way will work-- the constraints of your particular project and your comfort level with various risks will determine which approach is more appropriate.
Justin

Database design and pl/sql vs external procedures

hi,
My project involves predicting arrival time of a bus at a bus-stop, given statistical data of traffic patterns on the previous n(say 3) days, as well as the current location of the bus(latitude-longitude).
Given current bus location, I derive my distance-until-destination bus-stop, which must be translated into time until arrival.
Ive enlisted the triggers and procedures involved in making the prediction. Thse procedures especially the determination of perpendicular distances involve some complex trigonometric operations. I would like to know if my approach is correct and my database design is suited for the operations to b performed.
Will it be more efficient to implement the procedures as external procedures or as pl/sql blocks
This is my database design:
LINKS ( a link is the road segment between adjacent bus-stops)
LINK_ID                NUMBER      [PRIMARY-KEY]
START_LATITUDE          NUMBER
START_LONGITUDE     NUMBER
START_STOP_ID          NUMBER
END_LATITUDE          NUMBER
END_LONGITUDE          NUMBER
END_STOP_ID          NUMBER
LINK_LENGTH          NUMBER
BUS_ROUTE
ROUTE_ID               NUMBER
LINKS_ENROUTE          VARRAY(30) OF NUMBER
STOPS_ENROOUTE          VARRAY(30) OF NUMBER
TRACK(keeps track of current location of bus)
BUS_ID           NUMBER          [PRIMARY-KEY]
ROUTE          VARCHAR2(20)
LATITUDE          NUMBER
LONGITUDE          NUMBER
TS               TIMESTAMP
LINK_ID          NUMBER
START_STOP     NUMBER
END_STOP          NUMBER
ARRIVAL_TIMES(actual arrival times of the bus, updated by track)
BUS_ID           NUMBER     [PRIMARY-KEY]
BUS_ROUTE          VARCHAR2(20)
ARRIVAL          TIMESTAMP
STOP_ID          NUMBER
ETA (expected time of arrival)
BUS_ID          NUMBER
BUS_ROUTE          VARCHAR2(20)
BUS_STOP_ID     NUMBER
ARR_TIME          VARRAY(5) OF TIMESTAMP
Triggers and procedures
1)TRACK_TRIGGER
On insert/update of track determine which link the us is currently on.
Invoke a procedure that calculates perpendicular distance from current location to all links en-route (cursor on LINKS).
Results are stored in a temporary table. Select the link-id of the tuple whose perpendicular distance is MINIMUM. This is the link the bus is currently on. Place link-id, start_stop_id and end_stop_id in corresponding row of TRACK.
2)ARRIVAL_TRIGGER
update ARRIVAL_TIMES.and store in ARRIVAL_TIMES that start-stop id with the time-stamp of the current track record.
b)update ETA: Find the BUS-STOPS that come before the START_STOP of current track record. All these rows are deleted from the ETA tables, as the bus has already crossed these stops.
3)Prediction Algorithm Procedure.
Determine distance until destination for each STOP, 20 stops down from stop current location.
Determine current avg. speed of the bus over a 2 hour window, by dividing total distance traveled by time taken.
Calculate time-until arrival T1=current avg. speed * distance until destination
From the records of previous n days (say n=3) find those buses on the same route that were near the link the bus is currently on. Again determine avg speed over 2 hour window and calculate avg. speed.
Calculate travel time T(i) = speed*distance until destination.     i.=2,3, 4
The final predicted arrival time is a weighted sum of all T(i).
I hope Im not asking for too much, but the help would be greatly appreciated.
Thankyou,
Amina

hello,
actually i can manage ETA without a varray, since there will b a maxximum of 3 -4 values of expected arrival times at each stop. this can b done with separate columns.
though i dont quite understand how lag() will help me...from what i understand lag() is to access values of previous rows. but in ETA table each element in the varray(if there is one) is going to be the expected arrival time of buses on a particular route at that particular stop, and is different from the arrival time at a previous stop(i.e.row).
but for my other table BUS_ROUTE i have 2 varrays describing the links and stops enroute. in quite a few procedures i have to loop through these arrays and perform some calculations in every iteration is varray the best way 2 go, or nested tables?
Thank you
Amina
As an aside, external procedures tend by their very
nature to be slow - there's an overhead incurred
each time we step outside the database. Therefore
you really ought to avoid using a C extproc unless
your calculations really cannot be done in PL/SQL or
a Java Stored Procedure.
Also, before you go down the VARRAY route you should
consider the virues of analytic functions, notably
[url=http://download-west.oracle.com/docs/cd/B1050
1_01/server.920/a96540/functions56a.htm#83619]LAG()[/u
rl]. I think you really ought to do some
benchmarking of parformance before you start afdding
denormalised columns like ETA. You may find the
overhead in maintaining those columns exceeds their
perceived benefits.
Cheers, APC

Cannot login to App designer using PS id while able to login in data mover.

Hi,
I am installing peopletool 8.50 (HRMS). I ran all the sql scripts successfully. Ran the DMS script as well for demo database.
When I am trying to login in App designer using PS/PS i'm getting the following error..
File: SQL Access ManagerSQL error. Stmt #: 2 Error Position: 0 Return: 404 - ORA-01017: invalid username/password; logon denied
while I am able to login in data mover in boot strap. Can anybody pls help me out?

yes I am using Oracle 11g.
and man.. thanks a lot for your help. that was really awesome post :-)
People do say true.. here only I can find the GODs of Oracle.
Thanks Again
Gaurav
Edited by: Gaurav_laconic on Mar 12, 2013 6:13 PM

Suggestion: Create a Database Design Forum

I recommend the creation of a new forum dealing exclusively with database design questions, such as setting Primary Keys, Unique constraints, Check constraints, Indexes, schema-creation scripts, etc. There is no forum devoted exclusively to this topic now and I feel it would be very helpful to the user community. It would certainly make searching for answers to design questions much easier.

Billy Verreynne wrote:
Prohan wrote:
I don't agree there.
1. How to create a relational model certainly IS relevant to Oracle, which is a RELATIONAL DBMS.Oracle also supports data warehousing (star schema designs), network/hierarchical designs, object-relational designs - or pretty much any data model that you may come up with. Calling it just a relational DBMS is incorrect.
2. Your point that logical models are independent of specific technology is correct. What you're missing is that if a specific technology makes use of a certain foundational body of knowledge, that knowledge is a legitimate topic for a forum whose users use that specific technology.That is putting the cart in front of the horse IMO.
I would rather see data modeling and logical database design being done in a way that is untainted with specific vendor implementations and technology used. There needs to be a clear line dividing the design from the implementation. If not, then design decisions can (and will) be made based not on the correct logical data modeling principles, but whether it can be "handled" by the technology. A design that is tainted like that, will always be less than optimal (especially as technology is continually evolving and changing).
An OTN forum for database design will invariable be tainted with Oracle technology - and instead of learning sound data modeling fundamentals, a warped view of data modeling will be conveyed. Where doing abc will be acceptable (when it is not), because Oracle has feature xyz that can make the flawed design work (in a fashion).Excellent points. I think (or at least hope) such a forum would attract some number of pure theorists to straighten out the view. This might make for a lively forum, and might actually influence the real products, and might even get the cart on the right side of the horse.
Hmmm, I guess I do sound hopelessly optimistic.

IF Auto Update Statistics ENABLED in Database Design, Why we need to Update Statistics as a maintenance plan

Hi Experts,
IF Auto Update Statistics ENABLED in Database Design, Why we need to Update Statistics as a maintenance plan for Daily/weekly??
Vinai Kumar Gandla

Hi Vikki,
Many systems rely solely on SQL Server to update statistics automatically(AUTO UPDATE STATISTICS enabled), however, based on my research, large tables, tables with uneven data distributions, tables with ever-increasing keys and tables that have significant
changes in distribution often require manual statistics updates as the following explanation.
1.If a table is very big, then waiting for 20% of rows to change before SQL Server automatically updates the statistics could mean that millions of rows are modified, added or removed before it happens. Depending on the workload patterns and the data,
this could mean the optimizer is choosing a substandard execution plans long before SQL Server reaches the threshold where it invalidates statistics for a table and starts to update them automatically. In such cases, you might consider updating statistics
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2.In cases where you know data distribution in a column is "skewed", it may be necessary to update statistics manually with a full sample, or create a set of filtered statistics in order to generate query plans of good quality. Remember,
however, that sampling with FULLSCAN can be costly for larger tables, and must be done so as not to affect production performance.
3.It is quite common to see an ascending key, such as an IDENTITY or date/time data types, used as the leading column in an index. In such cases, the statistic for the key rarely matches the actual data, unless we update the Statistic manually after
every insert.
So in the case above, we could perform manual statistics updates by
creating a maintenance plan that will run the UPDATE STATISTICS command, and update statistics on a regular schedule. For more information about the process, please refer to the article:
https://www.simple-talk.com/sql/performance/managing-sql-server-statistics/
Regards,
Michelle Li

Logical Database design and physical database implementation

Hi
I am an ORACLE DBA basically and we started a proactive server dashboard portal ,which basically reports all aspects of our infrastructure (Dev,QA and Prod,performance,capacity,number of servers,No of CPU,decomissioned date,OS level,Database patch level) etc..
This has to be done entirely by our DBA team as this is not externally funded project.Now i was asked to do " Logical Database design and physical Database
implementation"
Even though i know roughly what's that mean(like designing whole set of tables in star schema format) ,i have never done this before.
In my mind i have a rough set of tables that can be used but again i think there is lot of engineering involved in this area to make sure that we do it properly.
I am wondering you guys might be having some recommendations for me in the sense where to start?are there any documents online , are there any book on this topic?Are there any documents which explain this phenomena with examples ?
Also exactly what is the difference between logical database design vs physical database implementation
Thanks and Regards

Logical database design is the process of taking a business or conceptual data model (often described in the form of an Entity-Relationship Diagram) and transforming that into a logical representation of that model using the specific semantics of the database management system. In the case of an RDBMS such as Oracle, this representation would be in the form of definitions of relational tables, primary, unique and foreign key constraints and the appropriate column data types supported by the RDBMS.
Physical database implementation is the process of taking the logical database design and translating that into the actual DDL statements supported by the target RDBMS that will create the database objects in a target RDBMS database. This will generally include specific physical implementation details such as the specification of tablespaces, use of specialised indexing (bitmap, clustered etc), partitioning, compression and anything else that relates to how data will actually be physically stored inside the database.
It sounds like you already have a physical implementation? If so, you can reverse engineer this implementation into a design tool such as SQL Developer Data Modeller. This will create a logical design by examining the contents of the Oracle data dictionary. Even if you don't have an existing database, Data Modeller is a good tool to use as a starting point for logical and even conceptual/business models.
If you want to read anything about logical design, "An Introduction to Database Systems" by Date is always a good starting point. "Database Systems - A Practical Approach to Design, Implementation and Management" by Connolly & Begg is also an excellent reference.

One Crystal Report portable to different databases (same database design)

Good day,
I apologize first off, as I am NOT a programmer, just a user.
In summary:
Crystal Report for data from Sql database.
Currently using ODBC connection and linking to database.
However, we have multiple databases, all with the same table structure etc, just different data.
Right now we change the datasource for each database.
The crystal report is run from an in house program
Is there a way we can have the report set so that it will pull the datasource at runtime, and not be hard coded into the crystal report.
Our goal is to take the one report and have our users of each database be able to access their own data without creating multiple copies of the report with each dataset.
Thanks,
RY

Hi Ryan,
As per my understanding you have multiple databases with the same database schema however with the different data. You would like to create reports where the user should be able to select which database to use and this should not be hard coded.
In this case you can use the Business View wherein you have the feature of Dynamic data connection which basically is a pointer to different Data Connections
A Dynamic Data Connection is a collection of pointers to various Data Connections. An administrator or user is able to select which Data Connection to use through a parameter.
When users refresh reports that are based on a Dynamic Data Connection, they are prompted to specify which of the available Data Connections to use.
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When a Business View designer creates a Data Foundation that is based on a Dynamic Data Connection, this user is prompted to specify which Data Connection to use. Similarly, when a user refreshes a report based on a Dynamic Data Connection, that user is prompted to specify which Data Connection to use. In the usage scenario, you would create one Dynamic Data Connection composed of the three ORACLE sales databases: Sales Development, Sales Testing, and Sales Production. A typical name for such a Dynamic Data Connection would be Dynamic Sales.
I hope this information helps you and let me know if this works for you.
Regards,
Prashant

Accessing the same database file using different handles/cursors

Will there be any problems accessing the same database file using different DB handles in a transactional environment? We have implemented a process which have multiple transient threads coming up and initiating DB opens and read/write operations to the same database file using different handles and cursors?
Can this potentially create any problems/bottlenecks? Can someone suggest the best way to deal with this scenario?
Thanks in advance.
SB

Hi,
Berkeley DB is well suited to the scenario you describe. You need to ensure that Berkeley DB is configured correctly for transactional access, the best information describing the requirements is in the Reference guide here:
http://download.oracle.com/docs/cd/E17076_02/html/programmer_reference/transapp.html
If there will be multiple threads operating concurrently, then you will need to design your application to detect and deal with deadlock situations.
Regards,
Alex Gorrod
Oracle Berkeley DB

Help with a database design for community housing project

Talking database design
Hi all, I have been wondering about the design of tables for a big block of residential units. There are 100 + rooms. there are about 25 houses in this complex but the 100 + rooms are all rented out separately.
Its just like a college campus really but its not a college campus , its a little unique.
The rents are applied as a percentage of income, so thats not common, so I included a tblRoomCost where the pre-calculated weekly cost is entered, and its got a date field in there for when the change of rent charged. I probably need to include an income field in tblCustomer, even just as an Admin reference.
So is this looking pretty ok and would there be any point in scrapping the database and using text files ?
So what do you think of these tables please ?
tblCustomer
pkCustomer, fldFirstName, fldLastname
tblRoomAllocation
pkRoomID, fkCustomer
tblRoomCost
pkRoomID, fldDate, fldRoomCost
tblTransactionID
pkTransactionID, fldDate, fldTransactionType, fkCustomer, fldAmount

The naming scheme is one I learned and havn't thought past it though I do get into trouble and your suggestion may prove useful when codeing !
I thought the tblRoomAllocation and tblRoomCost took care of changing. Though I see now that tbleRoomAllocation needs a Date field really. And the tblRoomCost has a fldRoomCost which isnt really that good an implementation as the rooms themselves are priced always accoedijng to the income of a resident and not because of the room. So the real world object is getting fudgy........
It is extremely unlikly that Admin would ever allow two rooms to be rented by an individual.
I will have a look at possibly your suggestion that an Accounts table be used.
Also I thought about having a startDate and EndDate in the tblTransaction to represent the period being paid for. Just seems like a lot of Dates in a transaction table. One to record the transaction, the other two dates to indicate the period that was actually being paid for. ? When perhaps I should work that out in the runtime code.v ? This will be a VB.Net app.
Do you think there is a need for Accounts table if only one room is permitted to be rented , though room changing may be common?
And thx for your input.
Message was edited by:
user521381

New database design product - ModelRight for Oracle

Whether you are a beginner or an expert data modeler, ModelRight for Oracle is the database design tool of choice for Oracle. Here are some of the things that make ModelRight for Oracle unique:
•     Extensive support for Oracle – support and advanced features - OR types, object tables, object views, materialized views, index-organized tables, clusters, partitions, function-based indexes, etc...
• full Forward, Reverse and Compare capabilities
•     Unique User Interface and Diagrammatic elements: with our mode-less and hyperlinked user-interface, navigating and editing your model is intuitive and easy.
•     Extensive use of Domains: you can create Domains for just about every type of object to propagate patterns, reusability & classification.
•     Unprecedented level of programmatic control: you can control the smallest details of the FE and Alter Script generation process.
Please check out our website at http://www.modelright.com and download the free trial version.
Please let me know if you have any suggestions or comments.
Thank you,
Tim Guinther
Founder, ModelRight, Inc.
[email protected]
(215) 534 5282

Excellent product. Pretty impressive. Gorgeous diagrams and sophisticated reports. Loved the myriad of navigation ways and non-obtrusive modeless dialogs. Very easy to use!
Keep the good work up.

Doubt in Database Design

Hi,
I have got some doubt in database design. I am designing a database for Inventory Management. Wherein i need to store the order details in one to many relationship. I have designed my tables as follows (Just sample)
-- Tbl_OrderOne
OrderCode (PK)
OrderDate
CustomerInfo
-- Tbl_OrderMany
OrderCode (FK)
ItemCode
Qty
What doubt i have got is, since oracle has the features like creating objects and use them as data type and store the data.
Can i use this feature in this case. Here in this case trasactions will be very high. Does it affect the performance. But presently i have designed it using foreign key reference as i showed you in the beginning. If using the Objects to store that huge number of data is feasible and increases the performance, then i can go for Object type feature.
Thanx in Advance
Regards
Vinayak
null

Vinayak,
One more thing. You can check out more information about NESTED TABLE at http://otn.oracle.com/docs/products/oracle8i/doc_library/817_doc/appdev.817/a76976/adobjdes.htm#446526
Regards,
Geoff

BOXI3.0 Universe Design using view or query in SQL

Hi. Alias here.
I would like to know what are the effect to the BOXI3.0 or SQL performance if:
1. We are using view or query in creating the universe?
2. Is it the correct way of creating the universe only from tables?
3. If need to do combination between tables and views?
Hope you all can reply to this matter.
Regards,
Alias

Hi Alias,
Designer has the capability to import tables and views you cna use in the design of the universe. Furthermore, you can also create a derived table in the universe - in simple terms it is much like a view, but the code is in the universe availble to the universe designer.
With all this available to you, it is pretty much up to you how you want to tackle the design. I would say first prise is using the physical tables in the databse, then move to using a view and if there are certain restrictions on the designer, use the derived tables.
Remeber this, at the end of the day, any SQL code generated or used is passed down to the database to be processed, may it be the query from the universe directly on the tables or by means of the views or derived tables - the database server will need to crunch through it all - and this is what will determine your performance.
Regards
Jacques

Recapturing database design using designer6i

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