Is it possible to set READ UNCOMMITTED to a user connecting to an SQL
2000 server instance? I understand this can be done via a front end
application. But what I am looking to do is to assign this to a
specific user when they login to the server via any entry application.
Can this be set with a trigger?
I haven't used the READ UNCOMMITTED transaction isolation levelbefore, and I was wondering if this would be an appropriate use:I have an ID table containing ID numbers that are randomly generatedand need to be unique. There is a stored procedure that potentiallygenerates thousands of these IDs in one execution and inserts theminto the ID table and various other tables. The basic idea is asfollows:Begin TransactionWhile not all IDs generated {GenID:@NewID = GenerateID()If @NewID exists in ID tableGOTO GenIDInsert into ID tableInsert into various other tables}Commit TransactionThe problem occurs when the stored procedure is being run by more thanone process concurrently. The check to see whether @NewID exists inthe ID table will block, waiting for the transaction in the otherprocess to commit.Would this be an appropriate place to use the READ UNCOMMITTEDisolation level to allow different executions of the stored procedureto see what the others are writing into the ID table before thetransactions finish? I only really care that the IDs generated areunique; they're not in sequence or anything like that. Has anyone hadexperience with anything similar?
View 8 Replies View RelatedCan someone tell me what a dirty read is?
View 1 Replies View RelatedRather than setting by session I would like to configure the DB as readuncommitted.Thanx Advance.
View 5 Replies View Related1. In this topichttp://groups.google.com/group/comp...b21516252b65e7c,someone wrote: "I've implemented SET TRANSACTION ISOLATION LEVEL READUNCOMMITTED at the beginningof a number of stored procedures and, then SET TRANSACTION ISOLATIONLEVEL READCOMMITTED at the end to minimize the disruption to the application.".My question is, do you really need to set READ COMMITTED at the end ofstored procedure? What scope does that command affect?2. Could someone write some real world example where i should neverread uncommitted data... i'm having trouble understanding when ishould and when i should not use it.
View 7 Replies View RelatedHi all,
Can anyone tell me how I can do a "Dirty Read" on a SqlDataSource Control? I'm affraid that the record locks are causing problems on the live system.
It is connected to an infromix db using odbc. Thanks.
Are there really any benefit on using Read Uncommitted Isolation Level or having a NOLOCK hints for retrieve queries when the default Isolation level just Read Committed (not using COM+). I'm confused why the Community Server uses this technique perhaps for perf issues but I couldn't see any reason why...
View 1 Replies View RelatedHi Sql gurus :))I've got a question that I couldn't find a satisfying answer on the net.What is the difference between:1) running sql query (select from sth with nolock) with no transaction2) running sql query (select from sth) withing a TransactionScope with option Read Uncommitted dataBasically, both should do the same work. However is anyone aware of any potential problems using any of both approaches ?We use 1) to improve our web application scalability since the system works in such a way that any selects and updates on that table (sth) do not interfere with one another.However, updates are done in a TransactionScope. And when having simultaneous select with nolock and update in a Transaction scope (the select statement has a where clause and returns records that are not updated by the update statement). However sometimes ( we still cannot figure it out when) the select statement returns some records twice.For example, the select should return 1000 records , but (sometimes) it returns 1002 records ( the extra 2 records are copies of some of the original 1000 records).Removing the nolock, makes the problem does not appear - but i want to be 100% sure that nolock is our troublemaker. And if it is - why ?We also have a problem that this particular nolock select sometimes return even less records than it should.I know it sounds impossible but it happens.So anyone who has experience with select with nolock, please share :)Thanks in advance, Yani
View 4 Replies View RelatedHi,
Yesterday, we have had a sudden load in our SQL Server 2000 which resulted in several locks. There was not too much time to investigate as we had to rush. A team member had reviewed the processes in EM, Manegement, Current Activity. Looking for blocking processes and killed them.
She told me that as soon as the blocking SPID was killed, another one arose and she had to repeat the operation a dozen of time. When done, the server activity was back to normal. She noticed that more than half of the blocking processes showed that they executed the stored Proc "P_SearchProducts".
We don't own the server and the information on what had happened at that time (batches or resource intensive operations, etc.) is not available for now.
The team suggests that we set the Transaction Isolation Level to Read UNCOMMITTED for this SP. I would like to know better about locks before I go ahead.
P_SearchProducts returns 5 recordsets each one could contains from 1 to 200 rows. To achieve the results, it creates about 10 intermediate tables (SELECT ... INTO #TableX) these temp tables are then used progressively to arrive to the final results. Roughly the volume of these temp tables could be double than the final results. The developer who wrote this SP is not a guru in SQL, there is room for improvement. But here are my questions:
Q1. Could the series SELECT ... INTO #TableX in P_SearchProducts prevent or lock another connection from executing the same SP? If yes, under which conditions?
Q2. Let's assume that P_SearchProducts has a slow execution time. Could it prevent another connection from updating the Product table? And thus leading to a deadlock situation? Something like another transaction (by User2) has obtained lock on most of Product tables, except the Product table which were being slowly read by User1 executing P_SearchProducts. But User1 cannot read the other product tables b/c there are locks by User2.
Q3. If the contention issue was provoked by the slow execution time of many request to exec
P_SearchProducts (let's assume there were suddenly 50 users on the web hitting the search product feature at the same time). Could the Read Uncommitted magically resolve the contention issue, providing we accept the consequences of the dirty read.
Sorry for the long post and thank you in advance for any help.
i attached adventure works in sql server 2008 and it showing as read only ,make it read write or remove read only tag from database.
View 11 Replies View RelatedHow to identify whether the files are in read write or read only?
View 1 Replies View RelatedI'm trying to do Sharepoint DR with Log Shipping and every thing configured except one thing which is switch the WSS_Content (Standby /Read-Only) DB to be ready and Write.
I tried from
GUI or ALTER DATABASE [WSS_Content] SET
READ_WRITE WITH NO_WAIT
but I received the below error:
Database WSS_Content is in Warm Standby
I have two database files, one .mdf and one .ndf. The creator of these files has marked them readonly. I want to "attach" these files to a new database, but cannot do so because they are read-only. I get this message:
Server: Msg 3415, Level 16, State 2, Line 1
Database 'TestSprintLD2' is read-only or has read-only files and must be made writable before it can be upgraded.
What command(s) are needed to make these files read_write?
thanks
OBJECTIVE: I would like to read a text file from SQL Server 2000, read the text file content, and load its conntents in a RichTextBoxTHINGS I'VE DONE AND HAVE WORKING:1) I've successfully load a text file (ex: textFile.txt) in sql server database table column (with datatype Image) 2) I've also able to load the file using a Handler as below: using System;using System.Web;using System.Data.SqlClient;public class HandlerImage : IHttpHandler {string connectionString;public void ProcessRequest (HttpContext context) {connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["NWS_ScheduleSQL2000"].ConnectionString;int ImageID = Convert.ToInt32(context.Request.QueryString["id"]);SqlConnection myConnection = new SqlConnection(connectionString);string Command = "SELECT [Image], Image_Type FROM Images WHERE Image_Id=@Image_Id";SqlCommand cmd = new SqlCommand(Command, myConnection);cmd.Parameters.Add("@Image_Id", System.Data.SqlDbType.Int).Value = ImageID;SqlDataReader dr;myConnection.Open(); cmd.Prepare(); dr = cmd.ExecuteReader();if (dr.Read()){ //WRITE IMAGE TO THE BROWSERcontext.Response.ContentType = dr["Image_Type"].ToString();context.Response.BinaryWrite((byte[])dr["Image"]);}myConnection.Close();}public bool IsReusable {get {return false;}}}'>'>
<a href='<%# "HandlerDocument.ashx?id=" + Eval("Doc_ID") %>'>File
</a>- Click on this link, I'll be able to download or view the file WHAT I WANT TO DO, BUT HAVE PROBLEM:- I would like to be able to read CONTENT of this file and load it in a string as belowStreamReader SR = new StreamReader()SR = File.Open("File.txt");String contentText = SR.Readline();txtBox.text = contentText;BUT THIS ONLY WORK FOR files in the server.I would like to be able to read FILE CONTENTS from SQL Server.PLEASE HELP. I really appreciate it.
I use Sql 6.5 and I want to create a login for a user with
READ ONLY privileges on the tables in the databases. How do I do this?
Thanks in advance.
i have a database which get refreshed every day from client's data . and we need to pull heavy data from them every day as reports . so only selects happens on that database.
we do daily population of some table in some other databases from this daily refreshed DB.
will read uncommitted or NOLOCK with select queries to retrieve data faster.
there will be no dirty read as there are NO DML operation in that database so for SELECT which happens concurrently on these tables , will NOLOCK work?
Can a user of db owner role of a database change the databse option to read only and read-write?If not what permission I need to grant to the user?
View 1 Replies View RelatedOK, I'm using VS2003 and I'm having trouble. The page works perfectly when I created it with WebMatrix but I want to learn more about creating code behind pages and this page doesn't work. I think it has some things to do with Query builder but I can't seem to get change outside "please register". I have the table populated and it is not coming back with "login successful" or "password wrong" when I've entered correct information. Enclosed is what I've done in VS2003. Can you see where my error is? Any help would be greatly appreciated.
Thanks again.
Imports System.data.sqlclient
Imports System.Data
Public Class login2
Inherits System.Web.UI.Page
#Region " Web Form Designer Generated Code "
'This call is required by the Web Form Designer.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.SqlConnection1 = New System.Data.SqlClient.SqlConnection
Me.SqlCommand1 = New System.Data.SqlClient.SqlCommand
'
'SqlConnection1
'
Me.SqlConnection1.ConnectionString = "server=LAWORKSTATION;user id=sa;database=test;password=t3st"
'
'SqlCommand1
'
Me.SqlCommand1.CommandText = "SELECT pass FROM Customer WHERE (email = 'txtusername.text')"
Me.SqlCommand1.Connection = Me.SqlConnection1
End Sub
Protected WithEvents lblUsername As System.Web.UI.WebControls.Label
Protected WithEvents lblPassword As System.Web.UI.WebControls.Label
Protected WithEvents txtUsername As System.Web.UI.WebControls.TextBox
Protected WithEvents txtPassword As System.Web.UI.WebControls.TextBox
Protected WithEvents btnSubmit As System.Web.UI.WebControls.Button
Protected WithEvents lblMessage As System.Web.UI.WebControls.Label
Protected WithEvents SqlConnection1 As System.Data.SqlClient.SqlConnection
Protected WithEvents SqlCommand1 As System.Data.SqlClient.SqlCommand
'NOTE: The following placeholder declaration is required by the Web Form Designer.
'Do not delete or move it.
Private designerPlaceholderDeclaration As System.Object
Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
'CODEGEN: This method call is required by the Web Form Designer
'Do not modify it using the code editor.
InitializeComponent()
End Sub
#End Region
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'Put user code to initialize the page here
End Sub
Private Sub btnSubmit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSubmit.Click
SqlConnection1.Open()
Dim dr As SqlDataReader = SqlCommand1.ExecuteReader
If dr.Read() Then
If dr("password").ToString = txtPassword.Text Then
lblMessage.Text = "login successful"
Else
lblMessage.Text = "Wrong password"
End If
Else
lblMessage.Text = "Please register"
End If
dr.Close()
SqlConnection1.Close()
End Sub
End Class
dear all,
First i'm using MS Sql Express and Management Studio.
I have to create a new login that have the ability to read only from a specific database.using the management studion i created a new login and in the user mapping tab i tried to map this login to a user that have a read only permission but i couldn't ."it gives an error"
I really appreciate your help if any one can give me a step by step way to do this.
Davids Maguire
Hi!
Can You tell me how can i fix this error:
Cannot open database "DiaulusSimple" requested by the login. The login failed.Login failed for user 'DIAULUSASPNET'.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: Cannot open database "DiaulusSimple" requested by the login. The login failed.Login failed for user 'DIAULUSASPNET'.Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
I am using ASP.NET, SQLServer2005, Visual Studio 2005
can somebody please tell me a way to read the SQL LOG (.ldf) file i.e
the transactions made to the database from different users
Hi guys
How to read .dll files. In which language it will be written.
Can any one of give some details about .dll appreciated.
Thank you.
Paul
looking for SQL Guru who can tell me what I'm doing wrong with the following VB executable which runs on the server, I'm getting the error,
"cannot delete record database is read only."
Seems straight forward but I can delete records from this table remotely via an active server page (asp) no problem.
Thank in Advance
Regards
Bob Cheeseman
King Kommunications <http://www.kingkom.com>
bob@kingkom.com <mailto:bob@kingkom.com>
Public Sub Main()
On Error GoTo skip
Dim stDocName As String
Dim stQuoteName As String
Dim objAccess As Object
Dim myDoCmd As Object
Dim dbs As Database
Dim PrimaryRS As Recordset
Dim location As String
Set dbs = OpenDatabase("NVO", dbDriverNoPrompt, False, "ODBC;DATABASE=NVO2000;DSN=NVO")
Set PrimaryRS = dbs.OpenRecordset("SELECT * FROM quotation_files_temp", dbOpenDynaset)
stQuoteName = PrimaryRS!QuoteNum
Set objAccess = GetObject("C:NVO2000fpdbNVO_FRONTEND.mdb")
objAccess.Application.Visible = False
Set myDoCmd = objAccess.DoCmd
stDocName = "quote"
stQuoteName = stQuoteName & "Q.SNP"
myDoCmd.OutputTo acReport, stDocName, acFormatSNP, "c:vo2000Documents" & stQuoteName
' dbs.Execute ("delete from quotation_files_temp") ' help needed here!!!!
dbs.Close
PrimaryRS.Close
Set dbs = Nothing
Set PrimaryRS = Nothing
objAccess.Application.Quit
Set objAccess = Nothing
Exit Sub
skip:
End Sub
Hi everybody,
Someone to know a program for DTS log reading ?
When I open it with Wordpad there was same confusion.
Thanks a lot.
ok when i upload my databases that i created in VS2005, they are read only.
so i though something was just funny, so i installed sql managment studio on the server and attached the databases, and when i attached them there grey with (READ-ONLY) displayed... how can i get my DB's out of read only! i tryied going through the properties of the DB through MSSQL managenet studio but that only generates an error...
any ideas!
Hi Friends,
I have the text file in my server which is 21 MB size.
i want to insert that text file into temporary table and then based on the conditions will insert the original table.But before inserting all the records in temporary table, i got the below error message but the backend process still running(inserting into temp table)
The following error was encountered:
Read Timeout
The system returned: [No Error]
A Timeout occurred while waiting to read data from the network. The network or server may be down or congested. Please retry your request.
I am using the following code configuration section
<sessionState timeout="600" />
<httpRuntime
executionTimeout="110"
maxRequestLength="21504"
requestLengthDiskThreshold="80"
useFullyQualifiedRedirectUrl="false"
minFreeThreads="8"
minLocalRequestFreeThreads="4"
appRequestQueueLimit="5000"
enableKernelOutputCache="true"
enableVersionHeader="true"
requireRootedSaveAsPath="true"
enable="true"
shutdownTimeout="90"
delayNotificationTimeout="5"
waitChangeNotification="0"
maxWaitChangeNotification="0"
enableHeaderChecking="true"
sendCacheControlHeader="true"
apartmentThreading="false" />
How to implement the page keep active while all the records are inserted into DB?
The new databound controls are great, but somehow doing the simpler things has gotten harder.The code is in a function that is passed pollid. I want to use SqlDataSource to get the smallest value of answerid where pollid = the value passed for pollid. For example:"Select top from PollAsnwers where pollid=" & PollId & " order by AnswerId" I can set up the SqlDataSource for a data reader to fill a GridView control, but that isn't what I want to do. In fact, I can't find anything on SqlDataSource that doesn't also involve the GridView control.I have so far:Dim myConnection As SqlConnectionDim myCommand As SqlCommandDim myReader As SqlDataReadermyConnection = New SqlConnection()myConnection.ConnectionString = ConfigurationManager.ConnectionStrings("UserPolls").ConnectionStringmyCommand = New SqlCommand()myCommand.CommandText = "Select top from PollAsnwers where pollid=" & PollId & " order by AnswerId"myCommand.CommandType = CommandType.TextmyCommand.Connection = myConnectionmyCommand.Connection.Open() Now assuming I have a single row of data, how do I read the value of Answerid? If I have this wrong, what should I have? Diane
View 6 Replies View Relatedgetting this error after publishing my site to local IIS, then trying my signup page.
Failed to update database "C:INETPUBWWWROOTAPP_DATAASPNETDB.MDF" because the database is read-only.
have tryed to change the attributes, still not working. have given write access to the APP_DATA folder from IIS, still not working.
and i cannot delete the APP_DATA folder from IIS, it says it is being used by another process or program. how to fix this? and or delete the folder?
Hey ,
I have sql server 2000, and i am using Microsoft Application block.
I have Transaction Like...
SqlConnection conn = new SqlConnection(ASLConnectionString); conn.Open(); SqlTransaction Trans = conn.BeginTransaction(IsolationLevel.ReadUncommitted);
But If i have another process that try to read the Table if that old transaction running.. it wouldn't Allow me to read the DATA.
i tried Isolation level "snapshot" but that works under sql server 2005 only. so i can not use that. And i have some services that will run during day time.
So if anybody have solution to read the data from table...from sql server 2000 even if another transaction is running?
Please Give any guideline..Help will be appriciated.
thanks & regards,
Nirav Patel
I am work with Asp.net 2.0 C#In my application i want to use following stored procedure.I am having two dropdownlist first one is show emplyees who is having MgrID is nullif i select anyone from first dropdown list the second dropdown is show the employees name who is working below the selected personhow to i get the values from folowing stored produre.i have created the following samples table.this Stored procedure is giving my values when i am excute in Query analyserBut i dont know how to cal this Stredprocedure in my code behind and how to excute when i am select dropdown oneCREATE TABLE dbo.Emp(EmpID int PRIMARY KEY,EmpName varchar(30),MgrID int FOREIGN KEY REFERENCES Emp(EmpID))GOCREATE NONCLUSTERED INDEX NC_NU_Emp_MgrID ON dbo.Emp(MgrID)INSERT dbo.Emp SELECT 1, 'President', NULLINSERT dbo.Emp SELECT 2, 'Vice President', 1INSERT dbo.Emp SELECT 3, 'CEO', 2INSERT dbo.Emp SELECT 4, 'CTO', 2INSERT dbo.Emp SELECT 5, 'Group Project Manager', 4INSERT dbo.Emp SELECT 6, 'Project Manager 1', 5INSERT dbo.Emp SELECT 7, 'Project Manager 2', 5INSERT dbo.Emp SELECT 8, 'Team Leader 1', 6INSERT dbo.Emp SELECT 9, 'Software Engineer 1', 8INSERT dbo.Emp SELECT 10, 'Software Engineer 2', 8INSERT dbo.Emp SELECT 11, 'Test Lead 1', 6INSERT dbo.Emp SELECT 12, 'Tester 1', 11INSERT dbo.Emp SELECT 13, 'Tester 2', 11INSERT dbo.Emp SELECT 14, 'Team Leader 2', 7INSERT dbo.Emp SELECT 15, 'Software Engineer 3', 14INSERT dbo.Emp SELECT 16, 'Software Engineer 4', 14INSERT dbo.Emp SELECT 17, 'Test Lead 2', 7INSERT dbo.Emp SELECT 18, 'Tester 3', 17INSERT dbo.Emp SELECT 19, 'Tester 4', 17INSERT dbo.Emp SELECT 20, 'Tester 5', 17CREATE PROC dbo.ShowHierarchy(@Root int)ASBEGINSET NOCOUNT ONDECLARE @EmpID int, @EmpName varchar(30)SET @EmpName = (SELECT EmpName FROM dbo.Emp WHERE EmpID = @Root)PRINT REPLICATE('-', @@NESTLEVEL * 4) + @EmpNameSET @EmpID = (SELECT MIN(EmpID) FROM dbo.Emp WHERE MgrID = @Root)WHILE @EmpID IS NOT NULLBEGINEXEC dbo.ShowHierarchy @EmpIDSET @EmpID = (SELECT MIN(EmpID) FROM dbo.Emp WHERE MgrID = @Root AND EmpID > @EmpID)ENDENDOUTPUTEXEC dbo.ShowHierarchy 1GO---President------Vice President---------CEO---------CTO------------Group Project Manager---------------Project Manager 1------------------Team Leader 1---------------------Software Engineer 1---------------------Software Engineer 2------------------Test Lead 1---------------------Tester 1---------------------Tester 2---------------Project Manager 2------------------Team Leader 2---------------------Software Engineer 3---------------------Software Engineer 4------------------Test Lead 2---------------------Tester 3---------------------Tester 4---------------------Tester 5OUTPUTEXEC dbo.ShowHierarchy 5GO---Group Project Manager------Project Manager 1---------Team Leader 1------------Software Engineer 1------------Software Engineer 2---------Test Lead 1------------Tester 1------------Tester 2------Project Manager 2---------Team Leader 2------------Software Engineer 3------------Software Engineer 4---------Test Lead 2------------Tester 3------------Tester 4------------Tester 5IF YOU HAVE ANY IDEA PLZ SEND TO MERegardsBeginner
View 4 Replies View RelatedHi everyone,
I have a table with a primary key called ID.
My problem is that I can NOT set the Is Identity propertiy of ID to yes!
How can I enable that field? or set it to yes?
Thank's a lot
/Pepe
I use MS Sql DataBase file (SQL 2005 )as the conneciton in my project.When I use GridView to update my database, it fail:The error message is :Failed to update database "D:DATAASPNETHEALTH8APP_DATADBHEALTH.MDF" because the database is read-only. What is the problem with it?
View 12 Replies View RelatedHello everyone.
I am to create a sample site using the club site example. I had a problem with the IIS but now it is solved.
Now i copyied the site to the IIS and it is running. But i cannot access ASPNETDB.MDF. It keep saying that the database is read only... It is not read only!!!
Can any one help me??
System.Data.SqlClient.SqlException: Failed to update database "C:INETPUBWWWROOTNEOAPP_DATAASPNETDB.MDF" because the database is read-only.
Thank you in advance.
Iasonas