Help on Database design

Hi Folks,
I'm assigned to create a database to test for OLTP before it is used in production. Can you please advice me on how to determine the capacity planning. Do we have any benchmarking for the initilization parameter sizing.
Seeking expertise advice on how to determine the values for the init parameters like pool sizes, SGA,PGA..etc..
Can you give me an example or a link where i can get the examples of benchmarking values for scenario like OLTP systems, OLAP systems..etc.
Appriciate your help.
Thanks in advance.
Karthik.

See Karthik, there is no golden rule for parameter settings and also for SGA , PGA and other stuffes. If you ask me, I would recommend you to start with optimal settings and make change according to the need. In addition of that,
you also need to think of schema design and what sort of Architecture is being
require for your database. Few to consider are RAC, PARTTIONING and Parellal processing, Although, this is not a good candiate for OLTP.
In addition of that I really like you to purchase a book "Effective Oracle By Design"
An excellent book to read prior to build your enviornment.
hare krishna
Alok

Similar Messages

Urgent help database design

Hi,
I need an urgent help with the design of the database, We have already a database in production but we are facing a problem with extensibility.
The client information is variant that is
1) number of fields are different for each client
2) client may ask anytime in future to add another field into the table
Please provide your views with practical implication (advantages and disadvantages) or any resource where I can find information.....
Help appreciated.....

Hi,
Database design is an art & science by itself - as far as I know, there aren't any rigid rules.
I would suggest that you have a look at the discussions in these two threads for a few general ideas :
Database Design
conversion from number to character
If your client requirements keep changing, I would suggest that you keep 8- 10 "spare" columns in your tables - just call them spare1, spare2, etc.. The only purpose of these tables is to allow flexibility in the design - i.e.., in future you can always extend the table to accommodate more fields.
I have used it a couple of times & found it to be useful - again, this is only a suggestion.
Regards,
Sandeep

Database design for Help Desk application.

Hello does any one know
Database design for Help Desk application.
ERD
Business rules and features
?

The best way to approach a database design is to write a
specification for the application. Document what processes the help
desk technicians will do. In the process, identify what pieces of
information they work with. When you have the complete
specification written, you can then begin grouping the pieces of
information they work with together. For example, a ticket may have
a number, status, priority and a person to whom it is assigned. The
person to whom the ticket is assigned will have a name, phone
number, e-mail address and a list of technical skills.
So in this overly-simplified example, we could have a table
that contains ticket information, a table that has information
about technicians and a table of skills. Then ask your self
questions like "Can one ticket be handled by more than one
technician?" "Can one technician handle more than one ticket?" Can
a technician have more than one skill?" In this way, you can begin
seeing the one-to-one, one-to-many and many-to-many relationships
that exist.

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

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

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.

Re: (forte-users) Round-trip database design

We have used Erwin quite sucessfully, but it's not cheap.
"Rottier, Pascal" <Rottier.Pascalpmintl.ch> on 02/15/2001 04:51:01 AM
To: 'Forte Users' <forte-userslists.xpedior.com>
cc:
Subject: (forte-users) Round-trip database design
Hi,
Maybe not 100% the right mailing list but it's worth a try.
Does anyone use tools to automatically update the structure of an existing
database?
For example, you have a full database model (Power Designer) and you've
created a script to create all these tables in a new and empty database.
You've been using this database and filling tables with data for a while.
Now you want to do some marginal modifications on these tables. Add a
column, remove a column, rename a column, etc.
Is there a way to automatically change the database without losing data and
without having to do it manually (except the manual changes in the (Power
Designer) model).
Thanks
Pascal Rottier
Atos Origin Nederland (BAS/West End User Computing)
Tel. +31 (0)10-2661223
Fax. +31 (0)10-2661199
E-mail: Pascal.Rottiernl.origin-it.com
++++++++++++++++++++++++++++
Philip Morris (Afd. MIS)
Tel. +31 (0)164-295149
Fax. +31 (0)164-294444
E-mail: Rottier.Pascalpmintl.ch
For the archives, go to: http://lists.xpedior.com/forte-users and use
the login: forte and the password: archive. To unsubscribe, send in a new
email the word: 'Unsubscribe' to: forte-users-requestlists.xpedior.com

Hello Pascal,
Forte has classes which might be able to scan the database structure
(DBColumnDesc,etc.). Express use this classes to determine how the
BusinessClass looks like. We use Forte to create the tables,indexes and
constraints. We have the Problem that the above described classes are only
readable but not fillable. The solution for us will be to create our own
classes in
the same manner than existing classes are. So we are able to make updates in
the database structure and maybe able to change the database tables with tool
code. Another reason for us to have the database structure in the
application is the
ability to see the table structure on which the Forte code works always up
to date
with the code. You are always able to compare the structure of the database
with
your businessclasses and able to convert a wrong structure to the correct
structure
with maybe just a little piece of code.
Hope this helps
Joseph Mirwald

Database design (ERD )for Inventory Management System

Dear All,
I am going to develop a simple Inventory Management System software using C# .NET for my learning. After searching different forums, many people have suggested to first create a database design for the software. I want a database design, in short, an ERD
diagram for simple Inventory Management System which shows proper entities(tables), attributes and relationship between entities.
It would be highly helpful for me as I am newbie to C# and databases.
Thanks,
momersaleem

Dear Rebecca,
Thanks for you suggestions.
As I am going to develop IMS for learning purposes so I think I wouldn't need to go in detail regarding Customer name and addresses. However, I am still thinking of adding country attribute in customers' table which I think will be helpful to sort out customers.
What's the difference between a purchase and an order? They're usually the same thing, which doesn't mean you're
wrong, but what are you picturing here? Purchase entity will be used to keep record of purchases you made and an order entity will be used to keep record of orders that cutomers placed.
Pricing:
Any order system needs to manage two very distinct bits of data that are easy to confuse. The price in the Product entity is the current
price. The price in the Order entity is the selling
price. Not at all the same thing--current price is almost certainly going to change over time. Selling price won't.
Does it mean that I'll change the price attribute for product to current_price and add selling_price to order table which will help to keep record of price at the time of order?
Why did you include a quantity field in the Products table? Is it meant to represent stock on hand?
Yes you are right. It represents stock in hand.
Could you please recheck the entities relationships as I am not confirmed whether these are correct or not?
Thanks,
momersaleem

Database design for share market

Hi One and All,
I have a query regarding, design of New database....
Right now I joined as a Database administrator as a fresher, my superior has given me one assignment i.e. I have to create a sample database on Share market. As per his requirement the tables should be Issuer table, Security table, Broker table, INvestor table, Account table, Order table, Tradeing table. He said that I have to prepare the fiellds for this tables and relation ships and whole database structure.... I can prepare relations ships and database structure but the problem is, I don't know how the stock market is really works. If any body help me in this issue I am very thank full to him.
I need just the table feilds, if I get this rest of job i wil do by studying the subject of share market.
Thank You

Hi,
As per Hemant this forum is not appropriate for this question. However you have to analyze the system by meetings with stock broker at stock Exchange or to the client for which you are designing the system. Ask your superior to arrange meeting with client and then ask question to him so that you can made database design for them.
Regards,
Abbasi

DataBase Design For Library maintenance

Sir I am doing my Final Year B.sc(Comp.sci), I am having my Oracle Project to do things.
I just wan't a Detailed DataBase Design for
Library Maintenance
Please Could you help me in terms of DataBase Design......

Suyambu
You have asked several questions of this nature.
A forum cannot be expected to take the place of a comprehensive book or training course.
Please ask reasonable questions about distinct issues which can be given succinct replies.

DataBase Design For Library maintanence

Sir I am doing my Final Year B.sc(Comp.sci), I am having my Oracle Project to do things.
I just wan't a Detailed DataBase Design for
Library Maintanence
Please Could you help me in terms of DataBase Design......

Suyambu
You have asked several questions of this nature.
A forum cannot be expected to take the place of a comprehensive book or training course.
Please ask reasonable questions about distinct issues which can be given succinct replies.

DataBase Design For InvoiceSystems

Sir I am doing my Final Year B.sc(Comp.sci), I am having my Oracle Project to do things.
I just wan't a Detailed DataBase Design for
Invoice Systems
Please Could you help me in terms of DataBase Design......

The best way to approach a database design is to write a
specification for the application. Document what processes the help
desk technicians will do. In the process, identify what pieces of
information they work with. When you have the complete
specification written, you can then begin grouping the pieces of
information they work with together. For example, a ticket may have
a number, status, priority and a person to whom it is assigned. The
person to whom the ticket is assigned will have a name, phone
number, e-mail address and a list of technical skills.
So in this overly-simplified example, we could have a table
that contains ticket information, a table that has information
about technicians and a table of skills. Then ask your self
questions like "Can one ticket be handled by more than one
technician?" "Can one technician handle more than one ticket?" Can
a technician have more than one skill?" In this way, you can begin
seeing the one-to-one, one-to-many and many-to-many relationships
that exist.

Database design for the Project System!

Hi
I need the database design schema for the Project System .
For example with the transaction code CJ20N at the left side all the Project Hierarchy is tabulated.
I want to know the relations between tables ?
Would you please help me ?

look logical database PSJ with tcode SE36
grx. A.

DataBase Design

Hello Friends!
I am new in database design. I design a database for a company which sale their products. The company has their outlets in four regions i.e. (North, South, East and WEST) and they want to check their sale of the Product.. The sample reportâs format and data are shown below:
1.     Product-Wise Monthly Sale
Sale for the Month of July-2004
     Books     NoteBooks     Pen     Pencils
Schools     25     10     50     25
Colleges     15     5     10     3
Universities     6     30     14     3
Government     2     27     6     1
Others     21     32     54     8
TOTAL:     69     104     134     40
2.     Sector-Wise Annual Sale
Sale for the Year 2004-05
     Books     NoteBooks     Pen     Pencils
Schools     25     10     50     25
Colleges     15     5     10     3
Universities     6     30     14     3
Government     2     27     6     1
Others     21     32     54     8
TOTAL:     69     104     134     40
3.     Sale of Product for the current and previous years
Sale by Product
     2001-02     2002-03     2003-04     2004-05
Books     10     5     15     25
NoteBooks     10     5     15     25
Pens     10     5     15     25
Pencils     10     5     15     25
TOTAL:     40     20     60     100
3.     Sale by Sector for the current and previous years
Sale by Sector
     2001-02     2002-03     2003-04     2004-05
Schools     10     5     15     25
Colleges     10     5     15     25
Universities     10     5     15     25
Government     10     5     15     25
Others     40     20     60     100
TOTAL:     80     40     120     200
4.     Region-Wise Sale for the current and previous years.
Sale by Region
     2001-02     2002-03     2003-04     2004-05
East     10     5     15     25
West     10     5     15     25
North     10     5     15     25
South     10     5     15     25
TOTAL:     40     20     60     100
With the help of above reports I design the following database. Please let me tell whether the following database design is ok or not otherwise please suggest me how to improve it so that i can get the result as per given the above-format.
Year (Table)
YearID int
Description Varchar2
Period_From Date
Period_To Date
Current logical
Month (Table)
MonthID int (1,2,3,4,5,6,7,8,9,10,11,12)
MonthDescription varchar2 (Jan,Feb, Mar, Apr, May, Aug, Sept, Aug, Oct, Nov, Dec)
StartDate Date
EndDate Date
Region(Table)
RegionID int (1,2,3,4)
RegionName varchar2 (East, West, North, South)
Sector (Table)
SectorID int (1,2,3,4,5)
Sector Varchar2 (School, Colleges, University, Government, Others)
Product (Table)
ProductID int (1,2,3,4)
ProdName varchar2 (Books, NoteBooks, Pen, Pencil)
Sale (Table)
SaleID int
ProductID int
Product varchar2
Sale int
RegionId int
SectorID int
MonthID int
YearID int
Thanks.
(BASIT)

how could we get the report of previous five years sale of the products.
SELECT trunc(sale_date, 'YYYY'), sum(sale_qty)
FROM   sales
WHERE sale_date >= add_months(sysdate-60)
GROUP BY trunc(sale_date, 'YYYY')
suggest whether dropped Product name from the sale table as I already have a column prodid in it?Yes. Duplicated data is a Bad Thing. This is Rule #1 of the late Dr. Codd's 12 rules. These are the foundationstones of good relation design. Wikipedia has a good introduction to them.
Cheers, APC

New Database Design

Hi,
I'm an DBA and i was assigned to design a new database(fresh) in oracle 11gR2 in windows platform for a project. Since, i'm new to database design, getting confusion on what perspective to approach and where to begin.
Can anyone please help on this.
Note: URL's are welcome.

1011442 wrote:
Hi,
Thanks for providing the link.
The link that you sounds good and providing much info on considerations in creating a database and schema security.
But, i want the logical design part.
Assume that the database design for College Management System. It might have enrollment module, result module, staff module, etc., including more schema objects. I'm expecting the procedures or steps involving in such designs & how to design.
It starts with interviewing the end-user and determining their requirements .. especially flushing out all the entities (student, staff member, department, course, class, etc, etc, etc) and their attributes, then determining the relationship between said entities and attributes. Those entities, attributes, and relationships will be your logical database design.

Help on Database design

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