Practical Use Of ACID Property
Apr 2, 2008Can anyone tell me the practical use of ACID properties. I know theory available in books. But where it will implement practically I am confused.
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DB Engine :: What Are ACID Properties
Jun 19, 2015I want to understand ACID properties through sql queries.
I have seen real world example everywhere but if I want to test it then how do I use sql queries to understand practically on my PC?
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ERROR_BROKER_CONVERSATIONS: Practical Example?
Jul 20, 2007Hello,
I read that is there is this Database setting for service broker: ERROR_BROKER_CONVERSATIONS
I have not understood the how to use this setting in real scenario.
Could somebody provide me some practical example?
White papers are also ok! :-)
Thank you
Marina B.
Practical Limitations With SQL Server
Oct 12, 2000We are primarily a DB2 and Oracle shop. There are movements towards SQL Server for smaller applications. We would like to know if anyone out there has shop standards in determining which database should go with what type of application. What we are looking for are possibly database sizes, number of concurrent users, hardware and software cost, network infrastructure, security, scalability, and development tools. Any information would be appreciated.
View 1 Replies View RelatedPractical Limitations Of SQL Server?
Jul 20, 2005Hi all,I'm looking for some ball park estimates on when SQL Server might startto break down, and can't find any reliable info. Any insight is appreciated.Basically, the situation is this: The database structure is very simple;just one table with about 15 columns and about 60-75 million rows. There'sno need for massaging data or complex relations, just simple searches onmaybe a max of 5 columns. Out of the gates we'll be looking at having 30concurrent users and rapidly expanding to about 300-400 concurrent users.I might need to rebuild the database on a daily or weekly basisdepending on how often changes are made to a master file. In the past I'vebeen bit in the butt with the absolute crappiness of SQL Server'sreplication, so I'm going to try to avoid that path if I can (plus I alreadyhave some scripts written to delete and rebuild a similar database on anightly basis). Would it be practical to destroy and rebuild a database thissize on a daily basis?The big question is if searching 60-75 million records is practical inSQL server. If so, what kind of machine would I need to get a nearly instantresponse time per search (.2 second or so) when everyone's banging on it atonce? How many concurrent users can I expect to be able to practicallysupport before SQL Server will start to bog down? Thanks for your thoughts,-Ringo
View 3 Replies View RelatedPractical Cases Of Good Dsatabase Designs
Jan 17, 2008Hi,
is there any website or book that provide excellent database design examples to learn?
Appreciate for any help
Ricky.
Changing Code Page Property Using Property Expression Doesn't Work
Jun 16, 2006I am having problems exporting data into a flat file using specific code page. My application has a variable "User::CodePage" that stores code page value (936, 950, 1252, etc) based on the data source. This variable is assigned to the CodePage property of desitnation file connection using Property expression.
But, when I execute the package, the CodePage property of the Destination file connection defaults to the initial value that was set for "User:CodePage" variable in design mode. I checked the value within the variable during runtime and it changes correctly for each data source. But, the property of the destinatin file connection doesn't change and results in an error.
[Flat File Destination [473]] Error: Data conversion failed. The data conversion for column "Column01" returned status value 4 and status text "Text was truncated or one or more characters had no match in the target code page.".
[DTS.Pipeline] Error: The ProcessInput method on component "Flat File Destination" (473) failed with error code 0xC02020A0. The identified component returned an error from the ProcessInput method. The error is specific to the component, but the error is fatal and will cause the Data Flow task to stop running.
If I manually update the variable with correct code page and re-run the ETL, everything works fine. Just that it doesn't work during run-time mode.
Can someone please help me resolve this.
Thanks much.
SQL Server Admin 2014 :: How To Set A Database To Suspect Mode For Practical Test HA
Jan 14, 2015I Want to test for Automatic switch between primary and secondary.
How do i do it ?
or
I need this for some purpose : How to set suspect mode for a database ?
SQL Server Admin 2014 :: Practical Upper Limit On Number Of DB Users
Sep 9, 2015Our development team wanted to create a database user for each application user in the application and use these for granular data access control, which at first, sounded like a good idea but our initial testing ran into some interesting results.
Our target user base was about 15 million users with an estimated 1% concurrency rate, and finding no MS documentation on an upper limit to the number of users a database can have we began some load testing to see how the database performed. In the hundreds of thousands of users range our test database had a hard time performing well under light loads (even without any concurrent connections).
When we purged the users and reverted back to just a handful of service accounts, performance went back to "normal" under the same loads. I began to wonder if this is a situation where throwing more hardware at the problem would overcome the issue or if there is a practical upper limit to the number of users a single database can handle well.
(There were of course other cons to this arrangement and I certainly was never going to expand the users tree in the object explorer for a database like this, but we thought it a solution worth investigating.)
What is the largest number of users any of you have had in a single database?
Value Of A Readonly Property Of Custom Task Is Not Updated In Property Window
Apr 17, 2008Hi,
I developed a simple custom control flow component which has several read/write properties and one readonly property (lets call it ROP) whichs Get method simple returns the value of a private variable (VAR as string). In the Execute method the VAR has a value assigened. When I put the value of ROP or VAR into MsgBox I can see the correct value. However when I execute the component I can not see the value of the ROP in the property window. I see the property but its value is empty string. For example when I put a breakpoint to postexecute or check the property before click OK in a MsgBox I would expect that the property value would be updated in SSIS as well. Is there a way how to display correct values of custom tasks properties in property window?
Thanks for any hints.
(URGENT) Cannot Be Written To The Property. The Expression Was Evaluated, But Cannot Be Set On The Property
May 7, 2008Untill recently I had a smooth running SSIS package,but suddenly it throws error syaing
"OnError,,,,,,,The result of the expression
"@[User:trTextFileImpDirectory] +"SomeTextStringHere"+ @[User:trANTTextFileName] +(DT_STR,30,1252) @[User:taging_Date_Key]+ "SomeTextStringHere"
" on property "ConnectionString" cannot be written to the property. The expression was evaluated, but cannot be set on the property."
I have child SSIS package running under a parent package (through execute package task)
I have few flat file connection managers in child package for text file import , in which I am building text file path dynamically at run time by assigning an expression in connection string property of connection manager.
The Expression is as follows
"@[User:trTextFileImpDirectory] +"SomeTextStringHere."+ @[User:trANTTextFileName] +(DT_STR,30,1252) @[User:taging_Date_Key]+ +"SomeTextStringHere"
Where @[User:trTextFileImpDirectory] is a variable which contains path of directory containg text
files.Value in this variable is assigned at runtime from parent package's variable,which in turns fetch
value from a configuration file on local server.
With my current configuration this path has been configured to some other server's directory over network ( I.e my package picks text files from some other servers folder over network)
While
"Some string here"+ @[User:trANTTextFileName]" part of file name string.
(DT_STR,30,1252) @[User:taging_Date_Key] Contain the date of processing ,value in this variable is also picked up at run time from parent package variable.
1) So can someone give me some insight into possible reason of failures.
2) Is it possible that problem arises if directory (from which I m picking text files) is assigned password or is there exist some problem in accessing forlders over network ?
3) Or there can be some problem in package configuration at design time( I.e where I m assigning value in variable from parent package vriables)?
Referencing One Item's Hidden Property In Order To Set Another's Hidden Property
Feb 15, 2007Hello,
I have a group I'll call G4.
The header table row for G4 contains 3 textboxes containing the sums of the contents within G4. The header table row for G4 is visible while it's contents, including the G4 footer table row, is kept invisible until the report user drills down into the group.
When the report user drills down into G4 the footer table row becomes visible and the sums of the contents of the group are displayed for a second time.
At this point I want the sums in the header to be set to invisible when the sums in the footer are made visible by the drilldown.
When I try to reference the hidden property of textbox66 in the G4 footer in order to set the hidden property of header textbox57 in the G4 header I get to this point...
=IIF(reportitems!textbox66.
When it fails to give me an option of choosing the .Hidden property and instead only gives me a .Value.
If I complete the IIF statement manually so that it spells out .....
=IIF(ReportItems!Textbox66.Hidden = False, True, False)
...the report chokes on it.
So my question is, how do I reference the hidden property of one or more textboxes in a group to use as condition checks to set the hidden property of another textbox in that same group?
Thank you for any help you can provide. We are only now beginning to implement reporting services and I have not yet had the chance to research this in greater detail for lack of time.
ConnectionString Property
Jun 28, 2006I am having trouble initializing my connection. This is the code:
Dim
DBConnPhone As New
SqlConnection(ConfigurationManager.AppSettings("DBConnPhone"))
Dim DBConnClient As New
SqlConnection(ConfigurationManager.AppSettings("DBConnClient"))
Dim Sqlcomm1 As New SqlCommand
Dim Sqlcomm2 As New SqlCommand
DBConnPhone.Open()
DBConnClient.Open()
Once I start debugging, it stops and give me the error "The ConnectionString Property was not initialized" Any suggestions?
ConnectionString Property Not Set
Feb 14, 2007
Hi, After many nights without sleep I'm not seeing this? Can anyone help why I'm getting a ConnectionString Property not set error? thanks!
Dim Sconn As StringDim DBCon As New Data.SqlClient.SqlConnectionSconn = ConfigurationManager.AppSettings("LocalSqlServer")DBCon = New SqlClient.SqlConnection(Sconn)Dim cmdCommand As New Data.SqlClient.SqlCommand
'Dont forget to instantiate a connection object
cmdCommand.Connection = DBConDBCon.Open()
How Can I Set Description Property By T-SQL ?
Jun 6, 2007I would like to create table by T-SQLand need to specify DescriptionBut I can't find any sample to add Description property by T-SQL Additionally, I also would like modify Description property by T-SQL. What can I do ????? Please help me ......
View 2 Replies View RelatedIdentity Property
Jul 6, 2007Hello friends,
I am using sql server 2005. In some tables to create the column Autoincrement I had set the 'Idetity Specification' property to 'Yes'. I want to know that how can we do it through sql scripts i.e. by writing query.
Please let me know
Thanks & RegardsGirish Nehte
Property Owners
May 7, 2008I'm trying to see the properties of a database and I'm getting the following error, even when trying to connect as sa.
Property Owner is not available for Database '[EPro]'. This property may not exist for this object, or may not be retrievable due to insufficient access rights.
any ideas? thanks in advance
Server Property
May 24, 2008hi,
whether there is any server property to remove lines while viewing the records in text mode
sample data:
select * from Employee
sno ename
--- ------
1 aaa
2 nnn
i need to remove the below the sno and ename column
LineHeight Property
Jun 12, 2006 I am use Reporting services 2000 SP2 and discover that the LineHeight property rendered correctly only in renderers for HTML output. PDF renderer, TIFF renderer and client side printing client do not render changes in this property at all.
Is it bug in Reporting services 2000?
Can someone try to change LineHeight property in SQL Server 2005 Reporting services and verify rendering output?
Where Is The IsSorted Property?
Nov 9, 2006Hello.
within a data flow task I have two OLE DB sources that I am attempting to put into a merge join.
When I connect them to the merge join transformation I get the following error:
The IsSorted property must be set to true on both sources of this transformation.
I understand what this means but I cannot see an IsSorted option in the properties of the OLE DB sources so I can't set it. Can you tell me where it is? for the time being I'm having to put a sort transform in to get it to work.
Thanks
Regarding Extended Property
Oct 31, 2006hi,
Can anyone tell me how to use the extended stored property like sp_addextendedproperty in java code?
Thanks,
Meghna
Every Time Job Property Changes
Mar 30, 2007Dear friends,
Every time i open the jobs propertimes on server, it changes the sql server login to windows from sql authentication. also the properties i set at the time of creating a job had given me an option to select the run as user but from that moment the option has gone, whats that all about?
thanks,
No CSS Property For Textbox?
Jan 3, 2007We want to use our styles say "mystyle" on a report. I am surprised that we do not have cssstylename as a property for a textbox?
Ideally, i should be able to add that style in the styles.css file and reference the style name on the textbox. All that would be needed is that it would add an attribute to the rendered html. I wonder if it already exists and i am missing some information?
What Is It InteractiveMode Property Really For?
Sep 28, 2006hi everyone,
According the information provided by BIDS if it have false anulates any message such as msgbox or something like that from the ssis execution. is it true?
TIA
Repeatwith Property
Sep 14, 2007I'm trying to figure out this repeatwith property setting. I have a row of textboxes that are labels at the top of the body of my report. Under this row is a list box "LstCategory" with a sublist "SubLstCategory". I set the repeatwith to LstCategory.
When I preview the report in VS it doesn't. When I publish this report in Report Manager it does. When I export from Report Manager (In PDF Format) it doesn't.
What do I have to do so it will repeat in Reporting Services?
Is it normal that In Report Manager that what you view does not export the same way?
I'm new at this altogether. About 4 months in SQL and 1 month with Reporting Services. So be gentle.
Regards,
Card Gunner
The ConnectionString Property Has Not Been Initialized
Jul 30, 2007In short, I have a couple grid views on a page that are used for editing as well as sorting, etc. The grids are setup to use the SqlDataSources. I'm trying to deploy this to a server environment for different instances (test,cert,prod) and am trying to set the ConnectionString for the SqlDataSource in the code behind (Page_Load()). Everything works well, except, I get an error message that says the "ConnectionString Property Has Not Been Initialized." Its a javascript alert coming up on top of the grid view.
Here is how I'm trying to set the ConnString in the Page_Load():this.EmployeeTimeCardDataSource.ConnectionString = ConfigurationManager.ConnectionStrings[connStr].ConnectionString;
Here is an example of the DataSource.<asp:SqlDataSource ID="EmployeeTimeCardDataSource" runat="server" SelectCommand="sp_Select_Managers_Employees_List" SelectCommandType="StoredProcedure"> <SelectParameters> <asp:SessionParameter Name="CurrentUser" SessionField="User" Type="String" /> </SelectParameters></asp:SqlDataSource>
The 'DataSource' Property Cannot Be Set Declaratively
Aug 24, 2007This my code for a blog page that shows active blogs:
<%@ Page Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" Title="Blogs"%><asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<h3>My blogs</h3>
<asp:GridView ID="Gridview1" runat="server" AllowPaging="true" AutoGenerateColumns="false" DataSource="SqlDataSource1">
<Columns>
<asp:TemplateField>
<HeaderTemplate>
Blog
</HeaderTemplate>
<ItemTemplate>
<b><asp:LinkButton ID="LinkButton1" runat="server" Text='<%#Bind("name") %>'
PostBackUrl='<%#Bind("blogid" "Blog.aspx?Blog={0}" %>' />
<br/>
<asp:Label ID="label2" runat="server" Text='<%#Bind ("description") %>' />
</ItemTemplate>
<HeaderStyle HorizontalAlign="Left" />
<ItemStyle Width="250px"/>
</asp:TemplateField>
<asp:BoundField DataField="username" HeaderText="Owner">
<HeaderStyle HorizontalAlign="Left" Width="100px" />
<ItemStyle HorizontalAlign="Left" Width="100px" />
</asp:BoundField>
<asp:BoundField DataField="posts" HeaderText="posts">
<HeaderStyle HorizontalAlign="Left" />
<ItemStyle HorizontalAlign="Left" Width="80px" />
</asp:BoundField>
</Columns>
</asp:GridView><asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ConnectionStrings:BlogConnectionStrings%>"
SelectCommand="SELECT [blogid], [name], [description], [username], [posts] from [Blogs] ORDER By[name]">
</asp:SqlDataSource> </asp:Content>
Compiling that i get the error in the subject specifically for line 4 (in bold). Any ideas?
Save Dr Property To Variable
Oct 10, 2007 how do you store a datareader propety to a variable? Below is my current code. I have already declared my connectionString and sqlComm objects, as well as the userName and such. I need to store the value from the dr to the variables, UserName, UserPass, and serverName. ThanksTry
sqlCon.Open()
dr = sqlComm.ExecuteReader
While dr.Read
userName = dr("uName").ToString
LogInfo("userName = " & userName)
userPass = dr("uPass").ToString
LogInfo("userPass = " & userPass)
serverName = dr("sName").ToString
LogInfo("serverName = " & serverName)
End While
dr.Close()
Catch obug As Exception
LogEvent("Credentials Error: " & obug.Message)
Finally
sqlCon.Close()
End Try
ConnectionString Property Not Initialized
Oct 22, 2007I am getting an error message that says that my connection string has not been intialized I have initialized it.
Dim AirliquidiConn As New SqlClient.SqlConnection(ConfigurationManager.AppSettings("AirliquidiDatabase"))
Any suggestions??
SqlDataSourceStatusEventArgs.AffectedRows Property
Nov 16, 2007I'm confused about the e.AffectedRows documentation. The documentation says that e.AffectedRows is, "The number of rows affected by a database operation. The default value is -1."I am getting -1 returned after a successful update. Am I supposed to get -1 returned after a successful operation or a 1 because 1 row was affected by the update?
View 2 Replies View RelatedThe ConnectionString Property Has Not Been Initialized
Jan 25, 2008Hi all
This is the code in my web.config file.
<appSettings> <add key="ConnectionString" value="server=127.0.0.1;database=testdb;uid=sa;pwd=sa"/> </appSettings>
When I'm connecting to the sqlserver database,the page shows that The ConnectionString property has not been initialized.
The code that I used to get the "ConnectionString" as belows
using System.Configuration;
protected static string connectionString =ConfigurationSettings.AppSettings["ConnectionString"];
public static object GetSingle(string SQLString,params SqlParameter[] cmdParms) { using (SqlConnection connection = new SqlConnection(connectionString)) { using (SqlCommand cmd = new SqlCommand()) { try { PrepareCommand(cmd, connection, null,SQLString, cmdParms); object obj = cmd.ExecuteScalar(); cmd.Parameters.Clear(); if((Object.Equals(obj,null))||(Object.Equals(obj,System.DBNull.Value))) { return null; } else { return obj; } } catch(System.Data.SqlClient.SqlException e) { throw new Exception(e.Message); } } } }
These code works well on my machine.When running on my colleague's machine ,the page show that exception.
Any ideal?
Conflict Detection Property
Feb 17, 2008hi;
What is conflict detection in sqldatasource control?
Thanks,mohsen
The ConnectionString Property Has Not Been Initialized.
Mar 21, 2008I tried to insert my inputs into the database but it says "The ConnectionString property has not been initialized."
These are my codes:
SubmitAssigment.aspx.vb
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click Dim conn As SqlConnection Dim mycmd As SqlCommand Dim dr As SqlDataReader Dim str As String conn = New SqlConnection(Configuration.ConfigurationManager.AppSettings("ConnectionString")) conn.Open() str = "INSERT INTO [UploadInfo] ([StudentID], [Subject], [Assigment], [File], [Upload], [Time]) VALUES (@StudentID, @Subject, @Assigment, @File, @Upload , @Time )" mycmd = New SqlCommand(str, conn) mycmd.Parameters.Add("@StudentID", Data.SqlDbType.VarChar, 500).Value = User.Identity.Name mycmd.Parameters.Add("@Subject", Data.SqlDbType.VarChar, 500).Value = DropDownList1.SelectedValue mycmd.Parameters.Add("@Assigment", Data.SqlDbType.VarChar, 500).Value = DropDownList2.SelectedValue mycmd.Parameters.Add("@File", Data.SqlDbType.VarChar, 500).Value = File1.PostedFile.FileName mycmd.Parameters.Add("@Upload", Data.SqlDbType.VarChar, 500).Value = "Yes" mycmd.Parameters.Add("@Time", Data.SqlDbType.VarChar, 500).Value = System.DateTime.Now dr = mycmd.ExecuteReader() mycmd.Dispose() dr.Close() End Sub
SubmitAssigment.aspx
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="SubmitAssigment.aspx.vb" Inherits="Student_SubmitAssigment" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <title>Untitled Page</title> <style type="text/css"> .style1 { width: 100%; } .style2 { width: 70px; } .style3 { width: 106px; } </style></head><body> <form id="Form1" method="post" enctype="multipart/form-data" runat="server"> <p> </p> <table class="style1"> <tr> <td class="style2"> Subject:</td> <td> <asp:DropDownList ID="DropDownList1" runat="server" Height="16px" Width="253px"> <asp:ListItem Selected="True">Select one....</asp:ListItem> <asp:ListItem>TCP2411 - Programming Language Concept</asp:ListItem> </asp:DropDownList> </td> </tr> <tr> <td class="style2"> Assigment</td> <td> <asp:DropDownList ID="DropDownList2" runat="server" Height="16px" Width="105px"> <asp:ListItem Selected="True">Select one....</asp:ListItem> <asp:ListItem>1</asp:ListItem> <asp:ListItem>2</asp:ListItem> <asp:ListItem>3</asp:ListItem> <asp:ListItem></asp:ListItem> </asp:DropDownList> </td> </tr> </table><p> </p> <input type= "file" id= "File1" name= "File1" runat="server" /> <br /><br /> <asp:Button ID="Submit1" runat="server" Text="Upload" /> <br /> <br /> <br /> <asp:LoginName ID="LoginName" runat="server" /> <br /> <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConflictDetection="CompareAllValues" ConnectionString="<%$ ConnectionStrings:ConnectionString %>" DeleteCommand="DELETE FROM [UploadInfo] WHERE [StudentID] = @original_StudentID AND [Subject] = @original_Subject AND [Assigment] = @original_Assigment AND [File] = @original_File AND [Upload] = @original_Upload AND [Time] = @original_Time" InsertCommand="INSERT INTO [UploadInfo] ([StudentID], [Subject], [Assigment], [File], [Upload], [Time]) VALUES (@StudentID, @Subject, @Assigment, @File, @Upload , @Time))" OldValuesParameterFormatString="original_{0}" SelectCommand="SELECT [StudentID], [Subject], [Assigment], [File], [Upload], [Time] FROM [UploadInfo]" UpdateCommand="UPDATE [UploadInfo] SET [Subject] = @Subject, [Assigment] = @Assigment, [File] = @File, [Upload] = @Upload, [Time] = @Time WHERE [StudentID] = @original_StudentID AND [Subject] = @original_Subject AND [Assigment] = @original_Assigment AND [File] = @original_File AND [Upload] = @original_Upload AND [Time] = @original_Time"> <DeleteParameters> <asp:Parameter Name="original_StudentID" Type="String" /> <asp:Parameter Name="original_Subject" Type="String" /> <asp:Parameter Name="original_Assigment" Type="String" /> <asp:Parameter Name="original_File" Type="Object" /> <asp:Parameter Name="original_Upload" Type="String" /> <asp:Parameter Name="original_Time" Type="DateTime" /> </DeleteParameters> <UpdateParameters> <asp:Parameter Name="Subject" Type="String" /> <asp:Parameter Name="Assigment" Type="String" /> <asp:Parameter Name="File" Type="Object" /> <asp:Parameter Name="Upload" Type="String" /> <asp:Parameter Name="Time" Type="DateTime" /> <asp:Parameter Name="original_StudentID" Type="String" /> <asp:Parameter Name="original_Subject" Type="String" /> <asp:Parameter Name="original_Assigment" Type="String" /> <asp:Parameter Name="original_File" Type="Object" /> <asp:Parameter Name="original_Upload" Type="String" /> <asp:Parameter Name="original_Time" Type="DateTime" /> </UpdateParameters> <InsertParameters> <asp:Parameter Name ="StudentID" Type="String" /> <asp:Parameter Name ="Subject" Type="String" /> <asp:Parameter Name ="Assigment" Type="String" /> <asp:Parameter Name ="File" Type="Object" /> <asp:Parameter Name ="Upload" Type="String" /> <asp:Parameter Name ="Time" Type="DateTime" /> </InsertParameters> </asp:SqlDataSource> <table class="style1"> <tr> <td class="style3"> <asp:Button ID="Button1" runat="server" Text="Confirm" Width="68px" style="height: 26px" /> </td> <td> </td> </tr> <tr> <td class="style3"> </td> <td> </td> </tr> </table> <br /></form> </body></html>
Can anyone help me out?
Pleasee
Thannkss...