Deleting, Updating And Inserting---is It LOCKING The Table?
Aug 17, 2006
I have created a single Data Flow Task that reads a set of records from a source table and then makes determinations whether to insert, update or delete from a destination table. The data is basically being copied from one database to another with a small amount of data manipulation and lookups. The problem seems to be that when running the task, even a small amount of records read from the source table seem to take a long time for the task to finish. I feed the records into a Script Component (the brains) that sorts the records to three separate outputs. I use OLE DB Commands to perform the DELETE and UPDATE and an OLE DB Destination for INSERT. I thought that by using three separate database connections would help, but it just appears to be locked while trying to perform these commands against the same table.
Is there a way to control or route these three record sets in such a way as to perform them sequentially?
I know it's a bit of a simple question for some of you, but I'm just learning SSIS (but I like it!).
Thanks!
Jeff Tolman
E&M Electric
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Sep 21, 2006
I am very new to SQL Server 2005. I have created a package to load data from a flat delimited file to a database table. The initial load has worked. However, in the future, I will have flat files used to update the table. Some of the records will need to be inserted and some will need to update existing rows. I am trying to do this from SSIS. However, I am very lost as to how to do this.
Any suggestions?
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May 21, 2008
Hi everyone
I have a Stored Procedure mySP that updates a table in a linked server.
The same table is also being updated by other processes in the remote server
Usually mySP updates 10-20 records at a time, and that works fine.
BEGIN TRANSACTION
......
......
UPDATE [REMOTE_SERVER].[DB].dbo.[REMOTE_TABLE] SET VALUE = 2
WHERE ID IN (SELECT ID FROM LOCAL_TABLE)
COMMIT
The problem begins when mySP tries to update 100+ records, it gets a time out probably due to locking issues
(indexes are properly set in both remote and local tables )
I read some articles where they suggest to break the transaction in several batches of a smaller size to avoid locking issues.
Something like:
BEGIN TRANSACTION
.....
.....
DECLARE @Rows int
DECLARE @Batchsize int
SET @Batchsize = 10
SET @Rows = 1
WHILE (@Rows > 0 )
BEGIN
UPDATE [REMOTE_SERVER].[DB].dbo.[REMOTE_TABLE] SET VALUE = 2
WHERE ID IN (SELECT TOP (@Batchsize) ID FROM LOCAL_TABLE)
DELETE TOP (@Batchsize) FROM LOCAL_TABLE
SET @Rows = @@ROWCOUNT
END
COMMIT
But it seems to make no difference.
Any ideas/suggestions?
Thank you
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Oct 31, 2007
Hello -- I have a Huge Table Tab1 (160 Mill Rows). I have a script that Inserts and Deletes from this Tab1 (This Script runs for a good 4/5 Hrs).
When the script is being executed, No other session can even do a "SELECT TOP 10 * FROM Tab1"
How do i avoid this? Any "NOLOCK" Keywords i should be specifying in my Script?
Thanks in advance
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Jul 20, 2005
I have two table both say A and B.If i insert a record in A that record should be inserted in B.If i delete a record in A that record should be deleted from B.Is that possible.If yes please tell me.Thankyou in advance,vishnu
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Nov 3, 2015
I am getting a number of deadlocks when inserting and deleting items from the same table.
The delete statement has a U lock and awaiting an IX lock on an index that covers the column in the where clause.
The insert statement has a IX lock and awaiting a U lock on the same index.
The delete statement is deleting about 5000 rows, where as the insert statement is inserting a single row.
Both these statements are found in stored procedures being called from LINQ to SQL.
I am wondering if there is a way I can prevent the delete statement taking the U lock out?My thinking being if the delete didn't take out the U lock then it would not deadlock with the insert. Are there any hints I could use to avoid the particular lock above?
I have seen various examples of multiple updates causing a deadlock, which can be fixed by adding multiple indexes. However, as I am inserting and deleting rows I imagine that all the indexes will need to be updated by both operations.
I have inherited the architecture and don't have the time to redesign everything at present. My backup plan is to deprioritize the delete and build in a retry mechanism.
However, it would be really good if I could find a more elegant way to handle deleting and inserting rows at the same time.
Deadlock trace information below...
11/02/2015 22:21:26,spid21s,Unknown,waiter id=process1cc9c68558 mode=IX requestType=wait
11/02/2015 22:21:26,spid21s,Unknown,waiter-list
11/02/2015 22:21:26,spid21s,Unknown,owner id=process203f31b498 mode=U
11/02/2015 22:21:26,spid21s,Unknown,owner-list
11/02/2015 22:21:26,spid21s,Unknown,pagelock fileid=1 pageid=721673 dbid=6 subresource=FULL objectname=PerforceReports_Staging.dbo.DebugReport id=lock1663f5d900 mode=U
[Code] ....
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Dec 23, 2003
I have an asp.net project that displays a timesheet based on a fortnightly system.
It has a Y and X axis, i.e. Sun-Mon, Sun-Mon across the top and Categories of hour types accross the Y axis, i.e. Holidays, Overtime, Maintenance.
I was using a datagrid to gather the rows, but I need to have the whole grid in edit mode which is something that requires more coding. So I have swapped to a datalist.
It will take me 240 fields to store all the data in their corresponding fields. So I basically need to know if there is an easier way to store two dimensional array type data into an SQL table using a minimum of fields.
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Jun 9, 2006
SQLNewbie writes "I have a table 'ImportedListings' that is populated with data external to the database. This table is only used to hold the data until I can move it to the permanent table 'Listings' at which point 'ImportedListings' gets truncated to nothing. Both tables contain almost identical data and structure. There is a listing ID column available for joins.
Basically I need to compare each row in ImportedListing and if it already exists in Listing, UPDATE Listing with the new info. If the row in ImportedListing doesn't exist in Listing, I need to INSERT it.
Physically deleting rows from the listings table is not an option. Do you have any ideas on how I can do this? I initially tried using a temp table to hold the matching listing id's but I could not get figure out the update statement with this scenario.
Thanks for any help! I have been trying to hammer this out all night(I just started programming tsql)"
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Apr 22, 2008
i wanted to ask how to insert values from a single web form into two sql tables, i have been looking and the visual web developer i use doesnt seam to allow me to even atempt it i've tried selecting all the values from two different tables and then adding those two tables to an insert function but it doesnt work likewise the update functioni have values in a table currently a reference number and i want to use this reference number to update the address values in this table so update this field.table1 and thisfield.table2 when ref number = @ refnumber the reference number is present in both tables and is linked PK to FK <asp:SqlDataSource ID="SqlDataSource2" runat="server"
ConnectionString="<%$ ConnectionStrings:Back End DataConnectionString %>"
SelectCommand="SELECT StartDetails.StartDetailsID, StartDetails.ContractIDNo, StartDetails.ContractName, StartDetails.NINO, StartDetails.AnticipatedStartDate, StartDetails.StartDateTime, StartDetails.StartDateLetterSent, StartDetails.StartDate, StartDetails.AnticipatedEndDate, StartDetails.ActualEndDate, StartDetails.ReasonForLeaving, StartDetails.Provider, StartDetails.AdviserReferrer, StartDetails.ProvisionCat, StartDetails.Provision, ClientDetails.NINO AS Expr1, ClientDetails.CentreNo, ClientDetails.FirstName, ClientDetails.SecondName, ClientDetails.AddressLine1, ClientDetails.AddressLine2, ClientDetails.PostCode, ClientDetails.ContactTelephoneNumber, ClientDetails.MobileNo, ClientDetails.Email, ClientDetails.DateOfBirth, ClientDetails.Gender, ClientDetails.PWD, ClientDetails.Ethnicity, ClientDetails.ClientGroup, ClientDetails.RepeatStartDate, ClientDetails.CaseworkerName, ClientDetails.ClientStatus, ClientDetails.PlacementDates, ClientDetails.JobsearchDay, ClientDetails.AchievedILP, ClientDetails.JobDate, ClientDetails.JobDate2, ClientDetails.JobDate3, ClientDetails.EligibleForRolledUpWeeks, ClientDetails.NoOfWeeksClaimed, ClientDetails.MarketingWhere, ClientDetails.Notes, ClientDetails.JobCentre, ClientDetails.JobCentreRep FROM StartDetails INNER JOIN ClientDetails ON StartDetails.NINO = ClientDetails.NINO WHERE (StartDetails.StartDetailsID = @StartDetailsID) AND (StartDetails.NINO = @NINO)"
InsertCommand="INSERT INTO [StartDetails] ([NINO], [StartDate], [AnticipatedEndDate]) VALUES (@NINO, @StartDate, @AnticipatedEndDate)"
UpdateCommand="UPDATE [StartDetails] SET [StartDate] = @StartDate, [AnticipatedEndDate] = @AnticipatedEndDate WHERE [StartDetailsID] = @StartDetailsID,[NINO] = @NINO">
<SelectParameters>
<asp:QueryStringParameter Direction="InputOutput" Name="StartDetailsID"
QueryStringField="StartDetailsID" />
<asp:QueryStringParameter Direction="InputOutput" Name="NINO"
QueryStringField="NINO" />
</SelectParameters>
<UpdateParameters>
<asp:Parameter Name="StartDate" Type="DateTime" />
<asp:Parameter Name="AnticipatedEndDate" Type="DateTime" />
<asp:Parameter Name="StartDetailsID" Type="Int32" />
<asp:Parameter Name="NINO" Type="String" />
</UpdateParameters>
<InsertParameters>
<asp:Parameter Name="NINO" />
<asp:Parameter Name="StartDate" Type="DateTime" />
<asp:Parameter Name="AnticipatedEndDate" Type="DateTime" />
</InsertParameters>
</asp:SqlDataSource> your coinsideration is appreciatedChris
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Feb 26, 2004
Hi All,
Yes, It can be a stupid question but I was trying to understand if it is really impossible!
I have a big table (around 200 millions of records) and I have to delete the old record. I read about the hints and ROWLOCK seems to be perfect. I don't want to have pages locked at all.
However, when I am deleting this table using rowlock I got the following locks
mode - key , type U (Update) and
mode - tab, type X (Exclusive).
I have tried a SELECT on new records but got to wait.
Is there a chance to lock only the records to be deleted?
Thanks a lot,
Felicia Schimidt
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Mar 18, 2014
I have a situation where deleting old records is blocking updating latest records on highly transactional table and getting timeout errors from application.
In details, I have one table called Tran_table1 in OLTP database. This Tran_table1 is highly transactional table, it will receive data for insert/update continuously
While archiving 2 years old records from Tran_table1 into Tran_table1_archive in batches(using DELETE OUTPUT INTO clause), if there is any UPDATEs on Tran_table1,these updates are getting blocked and result is timeout errors in application.
Is there any SQL Server hints to avoid blocking ..
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Nov 10, 2007
Hi,I made a gridview, and I am trying to make it so when the user deletes a row, values in other tables update. I used the following source code: <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>" DeleteCommand="DELETE FROM [Transactions] WHERE [TransactionID] = @TransactionID AND UPDATE [items] SET Quantityavailable, numtaken VALUES Quantityavailable + 1, numtaken - 1 WHERE ([Itemid] = @Itemid) " It gives the error that Quantityavailable is not a SET type?Thanks if you can suggest a remedy! Jon
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Aug 9, 2007
Hi
i have to delete the master table data without deleting the child table records,is there any solution for this, parent table has relation with the child table.
regards
vinod.t.v
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Apr 11, 2007
I use discountasp.net. I've added some new tables that I'd like to place on my website. My problem is that if I reattach my mdf file to my server, my member roster gets deleted. So my question is how can I update the mdf file without losing member information?
Thanks,JW
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Mar 1, 2005
Hi,
I'm using ASP with a JScript variant and MSSQL Server 2000. I would like to write a script that basically erases all data except for a few things.
Is there a way to update multiple tables at once without having to write lines and lines of code? I tried UPDATE tbl1,tbl2 SET uid='asc', but to no avail. It gave me a syntax error. My thinking behind it is something like... UPDATE dbo.* SET uid='mferguson' and after that I can delete stuff like DELETE dbo.*... Any ideas?
I know the above is ASP, I've tried this thread in the ASP forum with no avail... they referred me to this forum.
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May 2, 2007
Hi, am new to sql server. Please some one send me some introduction abt stored procedures and some coding exammples to update and fetch the data from datasourece.
thanks.
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Jul 12, 2007
Hi all.
I have an application that is using a SQL compact edition database to save/process information.
I run a test that is creating two threads:
1. one is inserting data in Table1
2. the other one is deleting records from Table1
When I run the application, I get some exceptions on both threads saying that the insert/delete could not aquire a lock on the table.
After a while, when I try to connect to the database I get an exception saying that the database file might be corrupted.
Any thoughts?
Thanks.
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Nov 11, 2015
Is it possible to force row level locking in Sql server 2015 before inserting the data and release the same afterwords..find the code for which we would like to impliment the same
DECLARE @TravelAgentid Varchar(20)
DECLARE @Date DATETIME2(7)
DECLARE @InsDate DATETIME2(7)
set @TravelAgentid ='A101'
[code]....
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Mar 8, 2007
i am using visual web developer 2005 and SQL Express 2005 with VB as the code behindi have a button and in the button click event i have written codes to INSERT to a database table - it has one primary keyso when i click the button, if there is already a row with primary key fields value as 10 and if i try to INSERT with the same value in the primary key field there will occur primary key constraintso , if i try to INSERT with the already existing primary key fields value, instead of INSERTing it should be UPDATEd without generating any errorplease help me
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Jul 16, 2002
Does anybody have a sample SQL script that will select table A and compare it to table B. If a row exists in both table A and table B, it will update the columns in table B with the columns in table A. If the row does not exist in table B, it will insert a row in table B using the row in table A. Is this possible?
Thanks Mitch
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Mar 26, 2008
i am creating a database driven website and i am using a sql database. I have a database called company with fields in it to do with a company, I have created a company.cs file which sets the variables, properties and methods and so on. These work fine. I have also stored procedures and they are right as far as i know. i also have coding behind the buttons of my page when i try and update or insert to the database. I am having the problem of when i enter data into the text boxes and click update, nothing gets inserted or updated and whats worst of all no error message appears. The table is used for storing profile data about a user, when a user logs on they enter their profile data, if i manually enter this data and input the username of a user into the username field within the database then the data appears fine in the textboxes of the update info page but the data will not insert or update. i have checked all the little things and i am stressing out cos i am running out of time and cannot find the problem...........please could someone help me!!!!! thanks
Heres my coding to some of my pages to help you....
the code behind the button
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using FYPtestsite.Classes;
public partial class Employer_employerprofile : System.Web.UI.Page
{protected void Page_Load(object sender, EventArgs e)
{if (!Roles.IsUserInRole(ConfigurationManager.AppSettings["employerrole"]))
{Response.Redirect("~/Error1.aspx");
}Company objCompany = Company.GetCompany(Profile.UserName);if (objCompany != null)
{
txtCompanyname.Text = objCompany.Companyname;
txtAddress1.Text = objCompany.Address1;
txtAddress2.Text = objCompany.Address2;
txtPostcode.Text = objCompany.Postcode;
txtCity.Text = objCompany.City;
txtPhone.Text = objCompany.Phone;
txtFax.Text = objCompany.Fax;
txtEmail.Text = objCompany.Email;
txtURL.Text = objCompany.URL;
txtProfile.Text = objCompany.Profile;
}
}protected void Button2_Click(object sender, EventArgs e)
{Response.Redirect("~/homepage.aspx");
}protected void Button3_Click(object sender, EventArgs e)
{Company objCompany = new Company();
objCompany.UserName = Profile.UserName;
objCompany.Companyname = txtCompanyname.Text;
objCompany.Address1 = txtAddress1.Text;
objCompany.Address2 = txtAddress2.Text;
objCompany.Postcode = txtPostcode.Text;
objCompany.City = txtCity.Text;
objCompany.Phone = txtPhone.Text;
objCompany.Fax = txtFax.Text;
objCompany.Email = txtEmail.Text;
objCompany.URL = txtURL.Text;
objCompany.Profile = txtProfile.Text;
if (Profile.Employer.CompanyID != -1)
{objCompany.CompanyID = (int)Profile.Employer.CompanyID;Company.Update(objCompany);
}
else
{int i = Company.Insert(objCompany);
Profile.Employer.CompanyID = i;
}labelstatus.Text = "Your profile has been successfully updated";
}
}
Any help would be greatly greatly appreciated!!!!!!
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Jul 20, 2005
Hi, I'm trying to store large strings to a database, so am using thetext field type (LongText). I have used this before when storing thehtml of a webpage, and was able to store more than 255 characters byusing just a normal update sql statement. Now I'm trying to store thebody of research papers, and must be doing something different, as Ican only store 255 characters.Can someone explain why SQL Server doesn't like what I am doing -should I be using the WriteText / UpdateText function? If so, pleaseexplain by example how I would do that, and why doing that works.Thanks so much,Iain
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Mar 10, 2006
I am using the following query to calculate date differences:select ..........DATEDIFF(d, recruitment_advertising.advertising_date, career_details.RTS_Email AS Datetime) AS Ad_to_RTS_days FROM .....I have stored all my dates as NVARCHAR because of the issues with localization.If the value is an empty String my output is eg: -38700. which is way off and incorrect. Some of the values in my table are NULL and they produce the correct result.Is there a T-SQL statement to replace empy Strings with the NULL value in my tables.I'd like to use it as a trigger when inserting or updating to convert empty strings to NULLbefore the values are inserted.Thanks guys.
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Apr 12, 2006
Hello.I've read many topics about this problem but i couldn't figure it out.I use form where user must insert 2 dates using texboxes.-One is required and other is optional.Sql 2000 is inserting either '20061105' or '2006.11.05' on insert update but select query returns 05.11.2006 on my report. Question 1.How do I insert or update dates from my form where date is entered dd.mm.yyyy to sql 2000 table?question 2. What to do if user left optional texbox date empty.I'm using SP and function with arguments (byval texbox1.text as date, byval texbox2.text as date)and parameters @date1, sqldbtype date =texbox1.text
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Mar 8, 2007
We've installed the Oracle provider for OLE DB on SQL Server 2005, which has the default collation (SQL_Latin1_General_CP1_CI_AS), and we've created a linked server for the Oracle 9.2.0.5 database, which has AL32UTF8 as the database character set. We can successfully insert strings into VARCHAR2 columns on Oracle from SQL Server via EXEC SP_EXECUTESQL('INSERT OPENQUERY(...) VALUES(...)') -- as long as the strings (whether selected from NVARCHAR columns on SQL Server or specified as literals with the N prefix during testing) only contain Windows-1252 characters.
If the SQL statement contains a character above U+00FF, the string on the Oracle side is incorrectly/doubly encoded; there are nearly (but not exactly) 4 bytes per character instead of the 1 or 2 you'd expect from ASCII/Latin-1 characters encoded as UTF-8.
We've tried reconfiguring the linked server: collation compatible = false, use remote collation = true, and collation name = Latin1_General_BIN2. But that had no effect.
What is the correct way to do this?
Thanks!
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Mar 18, 2008
Hi Gnite everyone, i once again need help with a T-SQL syntax for Auto Correction for insert and update when client enters the wrong format, i;e, creating a SSN Data type and a User Defined Procedure that auto corrects input format i;e,
user inserts into table authors of the pubs DB 525-477845 column au_id that executes auto correction so user doesn't have to put in dashes for SSN format. Please help me with this syntax .
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Nov 14, 2007
Hi,
Inside a single transaction I'm inserting/updating multiple records into multiple tables, in this order:
table 1 record 1
table 2 record 1
table 3 record 1
table 1 record 2
table 2 record 1
table 1 record 3
table 2 record 3
table 3 record 3
Now I'm getting an unspecified error on a certain table:
Unspecified error [ 3,-1300704038,-1834095882,activitypointerBase,x lock (x blocks),PAG (idx): 1078 ]
From msdn I see that:
PAG (idx) means a lock on an index page.
x lock means an exclusive lock:
Indicates a data modification, such as an insert, an update, or a deletion. Ensures that multiple updates cannot be made to the same resource at the same time. (I assume that multiple updates within the SAME transaction can be made, only multiple updates from different transaction cannot be made, right?)
I cannot find any reference to this error message and don't know what the numbers mean. Maybe it relates to data that can be found in the sys.lock_information table like explained here, http://technet.microsoft.com/en-us/library/ms172932.aspx, but I'm not sure.
Furthermore, the sys.lock_information table is empty. I haven't been able to reproduce the problem myself. I only received an error log and the database to investigate it.
So, does anybody have an idea what this error message means and what I can do to troubleshoot this?
Thanks,
Jeffry
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Apr 7, 2008
Hi,
We're running a Sage CRM install with a SQL Server 2000 database at the back end. We're using the Sage web services API for updating data and a JDBC connection to retrieve data as it's so much quicker.
If I retrieve a record using the JDBC connection and then try and update the same record through the web services, the query times out as if the record is locked for updates. Has anyone experienced anything similar or know what I'm doing wrong? If I just use DriverManager.getConnection() to establish the connection instead of the datasource, and then continue with the same code I don't get these record locking problems. Please find more details below.
Thanks,
Sarah
The JDBC provider for the datasource is a WebSphere embedded ConnectJDBC for SQL Server DataSource, using an implementation type of 'connection pool datasource'. We are using a container managed J2C authentication alias for logging on.
This is running on a Websphere Application Server v6.1.
Code snippet - getting the record thru JDBC:
DataSource wsDataSource = serviceLocator.getDataSource("jdbc/dsSQLServer");
Connection wsCon = wsDataSource.getConnection();
// wsCon.setAutoCommit(false); //have tried with and without this flag - same results
Statements stmt = wsCon.createStatement();
String sql = "SELECT * FROM Person where personID = 12345";
ResultSet rs = stmt.executeQuery(sql);
if(rs.next()){
System.out.println(rs.getString("lastName"));
}
if (rs != null){
rs.close();
}
if (stmt != null) {
stmt.close();
}
if (wsCon != null) {
wsCon.close();
}
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Oct 10, 2007
I am trying to insert data into two different tables. I will insert into Table 2 based on an id I get from the Select Statement from Table1.
Insert Table1(Title,Description,Link,Whatever)Values(@title,@description,@link,@Whatever)Select WhateverID from Table1 Where Description = @DescriptionInsert into Table2(CategoryID,WhateverID)Values(@CategoryID,@WhateverID)
This statement is not working. What should I do? Should I use a stored procedure?? I am writing in C#. Can someone please help!!
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Jan 31, 2008
I have created a table Table with name as Varchar and id as int. Now i have started inserting the rows like, insert into Table values ('arun',20).Yes i have inserted a row in the table. Now i have got the values " arun's ", 50. insert into Table values('arun's',20) My sqlserver is giving me an error instead of inserting the row. How will you solve this problem?
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Feb 7, 2002
Gurus,
I am trying to execute this stored procedure when I try to change all occurences of a field in a table.
(
@Dept char(8),
@DDept char(8)
)
As
Set NoCOUNt On
Begin
Select '@DDept'
update phodept set fo_dept = @Ddept
where fo_dept = @Dept
update phone set fo_dept = @Ddept where fo_dept = @Dept
End
GO
The table/database is being used by others, generally in a read only mode.
via a VB 5.0 FE program.
The Stored procedure, when it is invoked, just hangs like it is waiting for exclusive use of the table.
Is there a way around it, without doing major surgery on the VB code?
Thanks.
Sam
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May 24, 2002
Hello,
I am working on the implementation of a database for my company and I have
a simple (I hope) question to ask.
I have the following stored procedure that will be running when I want
(actually when I want to delete a customer).
Do not mind if you do not understand what this procedure does... ;-)
Actually the Level8View is a VIEW of a nested table
(CustomerData->CustomerData).
CREATE Procedure DeleteCustomer
@ClientID INT
AS
UPDATE Level8View
SET UpCode = Level2, Level1=Level2, Level2=Level3, Level3=Level4, Level4=Level5, Level5=Level6, Level6=Level7, Level7=Level8
WHERE Level1=@ClientID
UPDATE Level8View
SET Level2=Level3, Level3=Level4, Level4=Level5, Level5=Level6, Level6=Level7, Level7=Level8
WHERE Level2=@ClientID
UPDATE Level8View
SET Level3=Level4, Level4=Level5, Level5=Level6, Level6=Level7, Level7=Level8
WHERE Level3=@ClientID
UPDATE Level8View
SET Level4=Level5, Level5=Level6, Level6=Level7, Level7=Level8
WHERE Level4=@ClientID
UPDATE Level8View
SET Level5=Level6, Level6=Level7, Level7=Level8
WHERE Level5=@ClientID
UPDATE Level8View
SET Level6=Level7, Level7=Level8
WHERE Level6=@ClientID
UPDATE Level8View
SET Level7=Level8
WHERE Level7=@ClientID
DELETE FROM Customers
WHERE ClientID=@ClientID
GO
I checked this procedure and works perfectly.
What I want to do is to somehow lock the WHOLE TABLE (CustomerData) or the
view (Level8View) before the Update statements and unlock it after the
delete statements.
I do not want to do a Row by Row lock, or Page by Page lock since the updates
in this table occur in the whole table and during that operation I do not
want other threads to issue SELECT, INSERT or UPDATE statements.
Can someone answer me how I can lock and unlock the whole view or table
please?
I will appreciate it for your answer. Thanks.
Yours, sincerely
Efthymios Kalyviotis
ekalyviotis@comerclub.gr
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Nov 11, 2005
I have a SP for an e-commerce site that creates an order doing the following fashion:
begin
-Fill out some variables
*Critical Section
-Create Order number
-While loop select on order table and recreate if ordernumber already exists
-Insert into order table
*End Critical Section
-Insert into order lines table, address table, etc.
commit
The problem is the Create Order number and While loop used to be at the top and occasionally I would get duplicate order numbers if two submitted at the same time. I rearranged it to the above and it happens less now.
My question is if there is a way to put an XLOCK on the orders table only during the critical section lines. Also my understanding is that once the insert into orders is done that the server will hold a lock until the commit in case of rollback.? I don't want to XLOCK the whole SP if I don't have to. It is quick though.
Thanks
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