Database/Table Design Question - Object/Event Model
Dec 11, 2007
Hi,
Facts:
I created a database to support an application that tracks events on
different objects. The two main tables are tbl_Object and
tbl_EventLog. Each table has unique ID and on the tbl_EventLog there
is FK for a record in the tbl_Object. The events are inserted all the
time for the same or different objects from the tbl_Object. There are
about 600,000 objects in the tbl_Object and 1,500,000 (and growing)
events in tbl_EventLog.
Question:
The user often wants to know what the last event was for a specific
object.
What is the best way of retrieving the last event?
Should I simply do a max(eventdatetime) on a specific object? or
Should I add a LastEventID column to tbl_Object and update it every
time a new event is inserted? or any other way to implement it?
I chose the second method because I didn't think it made sense search
the event table everytime the user wants to know the last event, but I
wanted to know what the experts thought.
Please let me know what you think.
Thank you,
Oran Levin
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May 14, 2015
I am using sql2012 se and we want to use couchbase to store some data as documents. So the database will be Hybrid(partly SQLServer and Partly couchbase). However the database is still in the design phase. What are the things that we should keep in mind when designing this database from a design perspective? Our database which was completely SQLServer based(RDBMS) was using GUIDs everywhere based off NEWID() and prime goal is to get rid of GUIDs for the most part.
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Jun 16, 2008
Hi there
We are thinking to create a small scale of the "Software On-Demand" model for Support Ticket Management System which means that the client can login to do a support tick and shared the application using the same URL.
Couple options though:
1) We design by table such has a SUPPORTS table with has a foreign key of the ClientID from CLIENTS table. This will cover that client can only can a specific data within the SUPPORTS table.
2) Alternatively, create a dynamic table which is created specifically for "Client B" for instance for SUPPORT table and it will be called such as ClientBSupport table. Something that can be common it will be shared such as like look-up table.
Couple consideration though:
1) Considered client wanting to backup this table. Obviosly it has too querying based on the client id to get the right data.
2) Security withing that table. Is the data needs to be incrypted ... I guess this is expensive excercise.
3) Possibly have a model that access to this table in querying directly etc etc.
4) If the Support table is getting larger and larger and it's not fair for small client accessing the small information which has equal to the one that has big records? Cause it's sharing table.
Any inputs I am really appreciated.
Thanks
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Jul 27, 2015
I never created table on the basis of Data model diagram . I have to create the 3 table on the basis of given Data model diagram. There are 3 tables
1.md_geographyleveltype
2.md_geographylevel
3.md_geographylevelxref
I have tried to create 2 table but unable to create 3rd table.
CREATE TABLE [dbo].[md_geographylevel](
[type_key] [int] NOT NULL,
[geog_key] [int] NOT NULL,
[Type_description] [nvarchar](50) NULL,
[Store_flag] [nvarchar](10) NULL,
[Type_short_desciption] [nvarchar](50) NULL,
[Code] ....
I am getting difficulties to create table script for table
md_geographylevelxref
How to create the table create script for
md_geographylevelxref
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Oct 15, 2015
I have one database which is multi tenant, every table has tenant id and every tenant is mapped with separate file group. Now can I achieve below :?
1. Can I take the backup of only one tenant and restored in separate database?
2. Can I takeout the data of one tenant quickly?
3. Can I undo the data of a particular tenant with 2 days older data without disturbing the other tenant ?
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Oct 11, 2006
Hi There,This is related to a ms access database but since I use the SqlDataSource control I thought I should post here.I have a project that I was working on with this ms access db and using sql controls, everything was working just finesince one day I started getting "Object reference not set to an instance of an object" messages when I try to designa query or retrieve a schema, nothing works at design time anymore but at runtime everything is perfect, its a lotof work for me now to create columns,schemas and everything manually, I've tried reinstalling visualstudio, ado componentsbut nothing seems to fix it, did this ever happen to any of you guys?any tip is really appreciated thanks a lot
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Jun 22, 2006
In visual studio 2005, I create a new Integration Services Project. It tries to create the first package by default "Package.dtsx". The "Package.dtsx[Design]" tab displays
Microsoft Visual Studio is unable to load this document
Object reference not set to an instance of an object
I try to create new SSIS package or edit an existing one (from tutorial), I get the same error in the SSIS graphical user interface tab.
Thanks for your help.
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Jan 9, 2008
Hi all,
The following dbo.Tables of Northwind.mdf in my .SQLEXPRESS (SQL Server Management Studio Express) are missing:
dbo.Categories
dbo.CustomerCustomerDemo
dbo.CustomerDemographics
dbo.Customers
dbo.Employees
dbo.EmployeeTerritories
dbo.Order Details
dbo.Orders
dbo.Products
dbo.Regions
dbo.Shippers
dbo.Suppliers
dbo.Territories.
But, I have these dbo.Tables in a different Database "xyzDatabase". How can I copy each of these dbo.Tables to the another blank dbo.Table of Northwind Database?
I right clicked on the dbo.Categories and I saw the following thing:
dbo.Categories
New Table...
Modify
Open Table
Script Table as |> CREATYE To |>
DROP To |>
SELECT To |>
INSERT To |> New Query Editor Window
File....
Clipboard
UPDATE To |>
DELETE to |>
From the above observation,I think it is possible to copy the dbo.Table from the one Database to the Northwind Database that needs to be repaired. Please help and advise me how to do this task or tell me where I can find the Microsoft document that gives the details of this X-copy thing.
Thanks in advance,
Scott Chang
P. S. I am using VB 2005 Express to create a project to learn "Calling Stored Procedures with ADO.NET" (see Paul Kimmel's article in http://www.developer.com/db/article.php/3438221) that needs the dbo.Tables of Northwind Database and my Northwind Database has been screwed up for quite a while and needs a big repair.
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Jun 21, 2001
Hi All,
Does any body have experience in capturing DTS step error information through VB Script.
When I run following code , the code in the IF loop is executed but I get 0 as the error number. Please note that stp_sql points to an Execute SQL task and the execute SQL task is failing and this script is executed on completion ( not success) of the Execute SQL task.
If stp_sql.ExecutionStatus = DTSStepExecStat_Completed And _
stp_sql.ExecutionResult = DTSStepExecResult_Failure Then
stp_sql.GetExecutionErrorInfo CLng(error_code)
msgbox CLng(error_code)
end if
Any help is appreciated.
Rajesh
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Aug 21, 2015
I have a problem where a certain stored procedure disappears occasionally and I need to find out which script deletes it. I found this piece of code which gives the events related to the deletion of this stored procedure.
DECLARE @path NVARCHAR(260);
SELECT
@path = REVERSE(SUBSTRING(REVERSE([path]),
CHARINDEX(CHAR(92), REVERSE([path])), 260)) + N'log.trc'
FROM sys.traces
WHERE is_default = 1;
[code]...
Is there a way that I can find which stored procedure or event dropped this stored procedure?
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Apr 17, 2004
Hi Everyone,
I would like to know any good reference books or online material about using DTS Object Model in Visual Basic.
Thanks in advance.
With Regards,
kalyan
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Jan 4, 2007
Hi there,
Can anyone point me to some sample source codes or any articles that describes how I can programmatically create a package which will import data from a flatfile (csv) to Sql server database.
I know there is some example that describes exporting data from sql server to flatfiles. Anyway I have failed to accomplish my goal by following those examples.
If anyone have a code snippet to do that please help me with that.
Thanks in advance
Moim Hossain
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Oct 23, 2006
Is it possible to use SSIS expressions object model?
If it is, what classes can be used?
Thanks in advance
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Nov 14, 2007
I need to create RDF files dynamically. As one example, I need to output a report that contains an OLAP table from an MDX query and will need to generate the RDL that represents the table on the fly. (Binding to a data source with any built-in control will not even come close to solving the problem. The actual requirements are extremely complex.)
In short... Rather than outputting the RDL XML the hard way is there an object model I can use to construct an RDL document with? Even if it's a bindhind-the-scenese, not-supported library?
Thanks,
Terry
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Mar 27, 2006
I have created a sql login account called "webuser" and has given public role in my database. In my asp.net application i build connection string using above account and its password . We give permission on store procedure for for the above account to execute .We dont give table level permission for the above account . When we run the application with the above settings it runs fine on test server . However Now i have transfered the databse object to live server with its permissions . Now while I executing the aspx page , I am getting above error . I have checked that the store procedure has execute permission for webuser account and dbo(i.e SA) has all the permissions for all database objects . Still why i am getting error ? (Please note , the thing is working fine in test server)
Pl help
Regards
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Apr 22, 2008
I have an opportunity to rebuild a database model with the express purpose of improving query performance. So given the following I have a few questions.
Table A (~500M records)
Primary Key Field (int)
Field 1 (varchar)
Field 2 (varchar)
Field 3 (varchar)
Field 4 (varchar)
Field 5 (varchar)
Table B (1B+ records)
Primary Key Field (int)
Foreign Key Field (int)
Field 1 (varchar)
Field 2 (varchar)
Field 3 (varchar)
Field 4 (varchar)
Field 5 (varchar)
* Assumed: Tables are inner joined on all queries. The database is readonly.
-- Most of my lookups are based on querying Field 1 of Table A. The data content of Field 1, Table A is 90% unique.
1) Would it be more beneficial to put the clustered index on Field 1 instead of the PK field in Table A?
2) Can an Identity column be non-clustered?
3) Alternatively, would it be beneficial to build a separate lookup table with just the PK & Field 1 of Table A, with a clustered index on the lookup table Field 1 which I join on Table A? (did that make sense?)
-- I have a secondary lookup that performs queries on Fields 1, 2, 3, 4 & 5 of Table B
1) Would it be more beneficial to create an additional indexed lookup column of the concantenated values of Fields 1-5 of Table B versus a covering index of all 5 columns?
2) Does a clustered index have to be unique?
3) Would a clustered index be more beneficial over Fields 1-5 or the special lookup column versus the PK or FK fields?
4) Would creating a special lookup table with just the requisite fields be more beneficial?
An extra question. The existing data model uses the CHAR datatype for all columns less than 9 characters wide and the columns are set to allow nulls. This requires every select statement to COALESCE() and RTRIM() all these columns. I intend to make all (affected) columns VARCHAR, NOT NULL with a default value of a 0-length string.
Will this enhance query performance?
Thanks in advance for any insight.
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Jan 2, 2006
I had a SSIS Package which was developed on Beta Version Of SSIS, Now We have Standard Edition Of SSIS(Sql2k5) Installed.
In the Package we have One Flat file Source, One Script Component and A Sql Server as Target, We are programaticaly creating the package, Now When we open this Package in the Designer and Try to Run We get this error
"The script component is configured to pre-compile the script, but binary code is not found. Please visit the IDE in Script Component Editor by clicking Design Script button to cause binary code to be generated. "
Now when we just open the Script Designer and close it, The package runs.
I found the Error description at this link
http://msdn2.microsoft.com/en-us/library/microsoft.sqlserver.dts.runtime.hresults.dts_e_binarycodenotfound.aspx
but could not find any help on this.
Same thing use to work on Beta version now it is now working.
From my understanding the problem is that in beta version, the script use to run at runtime, Now what they have done is that they generate a compiled code out of script and run.
My problem is that since i am using C# code to generate the package, How Will I Create a Binary Code out of Script.
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Dec 25, 2007
Hi,
Can anyone tell how to copy multiple tables from from one db to another using SSIS object model.
I am confused with things like. Do I need to add multiple source and destination in a dataflow task or do I need to add multiple dataflow task?
What is the difference between these two? Is there any other (easy way) to achieve this?
Thanks.
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Feb 13, 2008
I have a question regarding table design (I'm using SQL Server Express 2005). Is it better and is there a performance gain by using layout # 2 instead of layout # 1? Someone told me it was better to divide everything up but it seems kind of useless here, plus it complicates the handling. So I want to know which one is faster (or better) considering large amount of records. Thanks! Layout # 1Objet==========ObjetIDClientIDObjetTypeStateObjetNoTitleDescriptionStartDateReturnDateEndDateLayout # 2
Objet==========ObjetIDClientIDObjetTypeStateDetailsObjet==========DetailIDObjetIDObjetNoTitleDescriptionStartDateReturnDateEndDate
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Feb 27, 2005
Im trying to design a database to use in SQL server , the design i've got now is working but It just doesn't look right to me and there must be a better way to set things out.
Heres the current situation
Theres 3 tables
USERTYPES
USERS
TICKETS
The users table holds the user information i.e.
userID
userName
Phone Number
userTypeID *
It contains a foreign key called userTypeID which is a primary key of USERTYPES
The USERTYPES table contains the two types of users on the system , these are standard and admin, so the table looks like this.
USERTYPESID
typeName
The TICKETS table holds the ticket details of tickets submitted by users. so
ticketID
ticketName
ticketDescription
DueDate
ticketRequestor *
AssignedTo *
Now here is where I have the problem, the ticketRequestor is a foreign key of the STAFF table staffID however AssignedTo is also a foreign key of the STAFF table staffID.
Currently in order to get this working i've had to turn off the enforce relationship for the AssignedTO - staffID link but idealy I think this enforce relationship should be on to ensure its a truely relational.
any ideas as to what I need to do to organise the relationships better ?
thanks
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Aug 3, 2007
Hi. I tried the following alter statement:
Code:
alter table userphotos
add constraint IX_userid unique (userid)
and got the following error:
Quote:
Msg 2714, Level 16, State 4, Line 3
There is already an object named 'IX_userid' in the database.
Msg 1750, Level 16, State 0, Line 3
Could not create constraint. See previous errors.
I previously created the same constraint in a different table (using IX_userid). Is it not allowed to use the same naming
scheme for constraints in different tables? What am I doing wrong?
Thanks.
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Mar 12, 2008
[Microsoft follow-up]
Hi,
I'm pretty sure the answer to this is "no" but thought I'd ask anyway. Is there any way of mimicing the /Validate & /WarnAsError options of dtexec if executing a package using the object model?
If not, should I request it in the interests of consistency?
-Jamie
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Jan 31, 2007
I have a small VB.Net 2005 app using the Microsoft.SQLServer.ManagedDTS.dll so I can use the SSIS/DTSx functionality.
The program ran fine in the IDE.
Then when I tried to create a setup project for it I recieved a warning that all dependancies for MSXML6.DLL were not found.
I clicked ok and the setup was created.
I tried to run the setup and it failed with "....msxml6.dll failed to register. HRESULT -2147023782. ...
So I said cancel the setup and registered msxml6.dll.
I deleted my setup project and recreated it. This time I did not get the warning about msxml6.dll dependancies.
I tried the setup again and it executed without any errors however when I run the program I now get:
"Cannot create an instance of the XML Document Object Model. MSXML may not be registered."
So I went back into the IDE with the project and now it will not run either. IT gets the same error.
Does anyone have any suggestions?
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Jan 15, 2008
Hi all,
I have to come up with a design choice for a DB Table for a financial firm(i.e. Tables with Fixed column or Value-Pair).
Case: SQL Server 2005 is used as a back-end for a web application(which basically is designed for doing web based analysis). The business people are insisting on a feature that enable power users to add fields to the underlying tables. One option proposed is named value-pair design approach? But from performance point of view, this seems a nightmare. How can this be integrated into static-column table approach. FYI, security policy of the client do not allow the underlying table structures to be changed by the user and currently
there are 5000 fields, with a possibility to grow.
Thanks so much for your suggestions!!
Dilla
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Dec 6, 2005
Hi,Using VB.net I have created a custom object (hope my terminology is correct here), it’s just a class that defines a few string, integer, and hash table variables. After creating an instance of this class and populating it with data I need to be able to store this instance of my object in a sql server data base table. How do I do this? I saw an article that used the image data type to achieve this (code was in java unfortunately) is this the correct approach. Could you please give me some code examples
Thanks
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Jun 6, 2006
Hi all,
We have sql sever 2000 as our backend database system. on the front, we have vb medical application screen for users to do the data entry.
for 7th screen, it is assoicated with table Case_Custom. user enter data througth 7th screen to populate Case_Custom table.
There is one column called Case_Custom.CaseID ( a foreign key to to parent table Cases) was populated automatically instead of user input.
However, I could not find which stored procedure, views or trigger or application code to populate this field? I have queried INFORMATION_SCHEMA.ROUTINES, dbo.syscomments and did not find anything updating Case_Custom.CaseID.
I have contacted our app vendor and have got any answer from them yet.
Any ideas?
Thanks,
Jane
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Mar 23, 2015
I have questions table and answers in survey database. Now I design responses table from users !
CREATE TABLE [dbo].[Response](
[ResponseId] [int] IDENTITY(1,1) NOT NULL,
[SurveyId] [int] NULL,
[QuestionId] [int] NULL,
[AnswerId] [int] NULL,
[VoterId] [int] NULL,
[Code] ...
My Questions : How can I store data if questions is multiply answers (checkbox type) ?What is best way ?
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Apr 14, 2006
In the past, we had table names such as:
PurchaseOrders
SalesOrders
Now with SQL 2005, you can use schema namespaces, so it could become:
Purchasing.Orders
Sales.Orders
So essentially you can use exactly the SAME table names, in different schemas.
So... would you recommend to change to the last model, or just stay with the old way?
What is best practice?
One of the reasons why I ask this question is that I looked at the AdventureWorks sample database included with SQL Server 2005, and Microsoft is using:
Sales.SalesOrderDetail
Purchasing.PurchaseOrderDetail
etc...
Why not:
Sales.OrderDetail
Purchasing.OrderDetail
etc...
????????
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Jul 20, 2005
When I run:select * from testtableI get this error message:Invalid object name 'testtable'.However, if I run:select * from testuser.testtableIt works. I'm logged in as testuser, and testuser is the databaseobject owner and tableowner. This was a restored database from adifferent server in SQL Server 2000. The testuser login was in theprevious database. I created the same login in this new test databaseand made it database owner.I've also tried running: sp_change_users_login 'Update_One','testuser', 'testuser'It completed successfully but I still get:select * from testtableInvalid object name 'testtable'.I've also tried creating a different user and making it database ownerand when I change table object owner to this new user, I still get thesame problem. I need to specify:select * from newtestuser.testtableEven though I'm logged in as newtestuser.I also then tried changing table owner to dbo. This seems to worklogged in as either user, but I want to have the tables owned by theuser not dbo. How can I resolve this?Any help would be appreciated.Erin
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Nov 12, 2007
Hi,
I have a select statement running on the client machine linking to different tables in 1 database. All with the same schema. When I ran it, i had this error. I had trial and error, removing 1 table at a time until i hit the one which is causing it. when i removed it, everything's ok. i just wonder if all the tables were using dbo schema what is causing this particular table to throw this error?
cherriesh
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Dec 26, 2012
I am getting following error on "Table Import Wizard" of Tabular model Cannot update the 'Database' object 'Tabular Sample_', it needs to be part of a connected Server object.
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Jan 24, 2008
Hi
I have a table (Sql server 2000) which has 14 cost columns for each record, and now due to a new requirement, I have 2 taxes which needs to be applied on two more fields called Share1 and share 2
e.g
Sales tax = 10%
Use Tax = 10%
Share1 = 60%
Share2 = 40%
So Sales tax Amt (A) = Cost1 * Share1 * Sales Tax
So Use tax Amt (B) = cost1 * share2 * Use tax
same calculation for all the costs and then total cost with Sales tax = Cost 1 + A , Cost 2 + A and so on..
and total cost with Use tax = Cost1 +B, Cost 2 +B etc.
So there are around 14 new fields required to save Sales Tax amt for each cost, another 14 new fields to store Cost with Sales Tax, Cost with Use tax. So that increases the table size.
Some of these fields might be used for making reports.
I was wondering which is a better approach out of the below 3:
1) To calculate these fields dynamically while displaying them on the User interface and not save in DB (while making reports, again calculate these fields dynamically and show), or
2) Add new formula field columns in database table to save each field, which would make the table size bigger, but reporting becomes easier.
3) Add only those columns in database on which reports needs to be made, calculate rest of the fields dynamically on screen.
Your help is greatly appreciated.
Thanks
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Jan 24, 2008
Hi
I have a table (Sql server 2000) which has 14 cost columns for each record, and now due to a new requirement, I have 2 taxes which needs to be applied on two more fields called Share1 and share 2
e.g
Sales tax = 10%
Use Tax = 10%
Share1 = 60%
Share2 = 40%
So Sales tax Amt (A) = Cost1 * Share1 * Sales Tax
So Use tax Amt (B) = cost1 * share2 * Use tax
same calculation for all the costs and then total cost with Sales tax = Cost 1 + A , Cost 2 + A and so on..
and total cost with Use tax = Cost1 +B, Cost 2 +B etc.
So there are around 14 new fields required to save Sales Tax amt for each cost, another 14 new fields to store Cost with Sales Tax, Cost with Use tax. So that increases the table size.
Some of these fields might be used for making reports.
I was wondering which is a better approach out of the below 4:
1) To calculate these fields dynamically while displaying them on the User interface and not save in DB (while making reports, again calculate these fields dynamically and show), or
2) Add new formula field columns in database table to save each field, which would make the table size bigger, but reporting becomes easier.
3) Add only those columns in database on which reports needs to be made, calculate rest of the fields dynamically on screen.
4) Create a view just for reports, and calculate values dynamically in UI and not adding any computed values in table.
Your help is greatly appreciated.
Thanks
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