SQL Server How To Prevent Locking To Do Read-Only Reports
Jul 20, 2005
Need some information regarding SQL Server locking.
Requirement is to run SQL Statements for reports (read-only) that will
not lock-out other people trying to update (write lock). For this, we
tried the following to make the db connection not deny write locks
(our report code will not have a read-only lock).
ADODB.ConnectionObj.Mode =adModeShareDenyNone
But this made our connection bumped whenever someone tried to update.
Tried enabling dirty reads by doing:
ADODB.ConnectionObj.IsolationLevel =adXactBrowse
Even this made our connection bumped whenever someone tried to update.
Is there a way to achieve what is needed without having a seperate
database for reports?
In a situation where messages are coming in faster than they can be processed, at what point will service broker start up another queue_reader? Also, how do you prevent table locking if part of the processing of that message involves inserting or updating data in a table? We are experiencing this problem because of the high number of messages coming through, and I'm not sure what the best solution is - does service broker have some built-in support for preventing contention on a table when multiple readers are running? Or maybe a pattern that can be used to get around it?
I found out that executing the procedure SP_INDEXOPTION and setting 'AllowRowLocks' to false i can prevent the sql server from locking rows in a table and 'AllowPageLocks' prevents from pages being locked. I need to preform same operation in case of tables. I need to perform insertion operations concurrently and acquire required locks manually. Is there a way to stop sqlserver from acquiring locks on the table. I need to disable all the locks (row, page and table).
I have an application in dotnet that uses sql express. This application will be deployed on the user computer and I have to find a way to prevent the user to be able to read the data and access the structure of the database.
Is there a way to do this ? Even if the user is a local administrator of the computer ?
I'm using (SQL RS 2005) data-driven subscription with Delivery by: Email. How do I prevent that an E-mail is sent when the result set is empty? (I don't wan't to do this in the select statment where I select my subscribers and parameters for the report)
How do I prevent empty reports from being sent as part of a SQL Reporting Services subscription
I have reports based on a query that some time has data and other times does not. I only want the report sent to users via email through subscrption if there is data available.
I want to avoid sending a report without data. How can I set this up?
I am quite new to MS SQL, and I want to read rows from a todo table, andwhen a row has been processed, I want to delete that row.Ages ago in MySQL I would probably have locked the table, select, processa row, delete a row, unlock the table.I have been reading through the documentation from MS SQL, but it's notclear what exactly I should do.Since I want to lock only one table in the select (the others just providedata, and are not modified), what's a good solution?--John MexIT: http://johnbokma.com/mexit/personal page: http://johnbokma.com/Experienced programmer available: http://castleamber.com/Happy Customers: http://castleamber.com/testimonials.html
I have a question on locking pattern of read committed with snapshot isolation level that when two transaction update two different records then why do they block to each other even if they have previous committed value (old version of record).
I executed the below batch from a query window in SSMS
--Session 1: use adventureworks create table marbles (id int primary key, color char(5)) insert marbles values(1, 'Black') insert marbles values(2, 'White') alter database adventureworks set read_committed_snapshot on set transaction isolation level read committed begin tran update marbles set color = 'Black' where color = 'White'
--commit tran
Before committing the first transaction I executed below query from second query window in SSMS
--Session 2: use adventureworks set transaction isolation level read committed begin tran update marbles set color = 'White' where color = 'Black' commit tran
Here the first session blocks to second session. These same transactions execute simultaneuosly in snapshot isolation level. So my question is why this blocking is required in read committed with snapshot isolation level?
I created some reports and save rdl files in a shared folder. Now some of managers want to view those reports using visual studio or BIDS(not from report manager). But they should not have access to modify the report and they can only open the rdl file and preview it. so i'm trying to set up security level to this folder so that they can only view the rports. So I gave read, read attributes and read data permission to that folder. But still not only I can open the file but can change it too. Does any one know how to set this security level so that when the rdl file is opened using VS, that perticular group can only preview reports?
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.
"SSIS 2012 Catalog doesn't have option to give read access to SSIS Catalog to view package run reports" ... Any luck allowing power developers / operators access to READ the SQL 2012 SSIS Execution Reports without granting them SSIS_Admin or Sysadmin?
According to this link posted back in 2011 (w/ Microsoft's feedback in Nov 2011: "We’re closing this issue as “Won’t Fix.” At this point the bug does not meet our bar for resolving prior to SQL Server 2012 RTM. As we approach the SQL Server 2012 release the bar for making code changes gets progressively higher." URL....Regarding Permissions to SSIS Catalog, here are the findings. We can give access in three ways:
1. READ Access – We can provide a user db_datareader access. With this the user can see the objects within the SSIS catalog database, but cannot see the reports.
2. SSIS_ADMIN – Add the user to this database role in SSISDB. With this the user can view the reports. But it also provides them privileges to modify catalog information which is not expected. We can add it using below script EXEC sp_addrolemember 'ssis_admin' , 'REDMONDPAIntelAnalyst'
3. SYSADMIN - Add the user to this server role. This will make the user an admin on the SQL server. This is not intended. Is there any method available which will have provision to give read only access to see SSIS Catalog package execution reports and not having modify Catalog access.
Hello SQL Server Experts, Data Analysts, and Report Writers et al:
re: Reporting Options with SQL Server
I wanted to propose an offshoot to the pryor thread:
Would anyone take a stab at comparing Access Reports, Crystal Reports, Cognos or other options to all the Reporting Services and its components offered as part ofSQL Server, especially as to extracting data from SQL Server into a report format?
I guess this is a far as capabilites, ease of use, limitations, and especially formatting or presentation of the end report product?
Thank you to all, and I hope this is a beneficial discussion to others.
I searched the list but did not see anything related.
I cannot open a file directly exported from RS in the Excel format. If I open the file in the Windows version and then close it, no need to even save it, I can then open it with the Mac version of Excel. The file size after closing is about 2K less so the RS program is adding something onto the file that the Mac version does not like. It will crash Excel when trying to open.
I cannot export the report as CSV as it will not correctly import into Excel on the Mac.
Suppose I have a database storing some confidential information, such as legal information, medical or financial records, etc., and a Web site with a membership system so that only authorized users can view the information.
I understand I can encrypt the information, and the user's passwords, so that if the database is compromised it still shouldn't be possible for an outsider to view the confidential information.
However, what about people who have legitimate access to the database, such as the DBA, Web developer, etc., but who should not be able to view the confidential information? For example, even though the user's password was encrypted, what would stop the DBA from replacing the user's password with his own (encrypted) password, then logging in and viewing the user's info, then copying back the original encrypted password? Or, adding a new user for himself with whatever permissions he chooses?
Does anyone have a good strategy or technique for preventing database drops in SQL Server 2000? I know in 2005 DDL triggers rock, but in 2000 what can you do to audit who drops a database why keeping the same permissions intact.
What I want is a trigger that is specific to my DB called "JunkStuff". I only want to block a servername from connect to my super dooper DB "JunkStuff".
I have a problem setting the default value of a column. I am trying to set it to
(CONVERT([float],getdate()+(2),0))
However, SQL Server automatically sets it to
(CONVERT([float],getdate()+(2),(0)))
While it functionally does not change anything, we have a tool which compares the database schema against a pre-existing schema and shows this as an error.I have tried setting the value directly and through scripts but it does not work either way.
I created account with permissions in order my program (I use C#.net) can connect to SQL Server 2008 by this account But I don't want that user can use this account to login to DB by SQL Management Studio for security purpose So how to prevent user login to SQL Management Studio ?
Can I setup "db_denydatareader" to MASTER db to prevent the access ?
I have a table X with 61390 rows on it. IT is a crucial table which is being read and updated constantly. If I create a clustered index on the Primary Key (identity column) and run UPDATE x SET c1 = 1234 where PKCOL = 4321 the best lock I can get is a table Lock. If I create a compound non-clustered index on C1 and PKCOL the best lock I can get is a Page Lock. PAge Lock is OK but as this table is in High demand I want a row lock so others can carry on referenceing other parts of the table. WHy does it take a page lock and not a Row lock?
We are becoming increasingly more involved with SQL Server 7.0 development. Can someone show me a good example of ROW LOCKING with exclusive and share modes? If I am starting a transaction with a SELECT and later an UPDATE, what is the best way to handle locking?
is there a way of locking db on server. i am doing a overtime and pay system but there is a few members of IT staff that are very nosey and this is senstive information and i dont want them looking at the tables on the server can these be locked for only me to view
I'm trying to determine if a row in a table is locked. First, I issue a lock on some rows. Then, I query the syslockinfo table to see which rows are locked. It tells me which rows are locked, but it returns a hashed resource value that, I guess, is somehow related to the key. How can I un-hash the value? Or, how can I hash my own key so that I can compare it with the hashed value? I have tried using the HashBytes function, but I don't know what is actually being hashed when the row is locked.
For example:
begin transaction
select * from test with (rowlock, updlock)
select * from master..syslockinfo
where rsc_objid = (select id from sysobjects where name = 'test') and req_mode = 4
I have a setting where two Web Servers access the same SQL Server database. To gaurantee consistent data writes and reads I need to lock part of the database in special conditions.
I know exactly when I need particular tables of the database to be locked, but I am in doubt of how to do it. Does SQL Server 2005 have any mechanism for providing locks gauranteed to free the lock if one of the web servers crash - or if SQL Server itself crashes?
I tried to use dbo.tables of Northwind database in SQL Server Express to do SqlCommand to populate a DataTable in DataSet. The SqlCommand failed in the project execution and I found that Northwind database in SQL Server Express is busted and gone (just the name "Northwind" remained in the SQL Server Management Studio Express). How can I prevent it from happening in my "SqlCommand-SqlConnection" project? Please help and advise.
I tried to repair my "Northwind" database by using the SQL2000SampleDb.msi of Northwind and pubs Sample Databases for SQL Server 2000 downloaded from the http://www.microsoft.com/downloads. My "pubs" database is still in my SQL Server Management Studio Express. How can I just repair my "Northwind" database by using the Microsoft SQL2000SampleDb.msi program? Please help and advise this matter too.
Currently I am working on asp.net Intranet system.I need some suggestion on records locking for Sqlserver & ASP.net. I want to prevent two user to open the same record for modify.Means if some one has open one record (id=xxxxx) for modify then others should not be able to open same same record (id=xxxxx) for modify .otherwise if both user will open/update same record then information in database will not be updated correctly. Any idea how we can do the record locking so that not two users can open same record(id=xxxxx) for modify.
In the application I'm working on, I need to be able to use different locks on my records during certain transactions. I need to know how to do this programmatically from within VB.net. If someone can show me an example of how to do this or show me where I could find some, I'd appreciate that.
Hi All,According to my observation using SP_WHO2 in my database, some INSERTstatements are getting blocked by SELECT statements. Though theblockingSELECT statement is having ReadPast hint, i think, it will only readpastlocked resources but will not guarantee the select statement itself notblocking other statements(in my case Insert). According to my knowledgeandinformation, select statements take shared locks but why then thesestatements are blocking insert statements?Can there be any other solution other than using NoLock hint as thishintmake sure no shared locks are issued but it can read uncommited data.Need help urgently.ThanksRitesh
How to avoid table locks during simultaneous addition, deletion and updates of 50,000 records or more. I am using SQL Server 2005 interfacing with Java.
