Hi,
I want to make SQLTransaction as global and use it checking the State.
But then where there are Only Select queries are going to fire, it will open transaction.
So, Does it locks database/tables when Only Select query comes in SQLTransaction.
If you have another successful way of doing this, Please suggest.
Thanking you.
tats
I am trying to find a way to lock rows of data used in a SELECT query from being read by another SELECT query.
I could do a "begin tran - select - update - rollback" sequence but was wondering if there is a cleaner way to do this??
Tried UPDLOCK, ROWLOCK, TABLOCK, HOLDLOCK in multiple variations but none seem to block the select.
Hi,
I am joining a table with a view in my query to get the desired data. But when I run this query it does not produce any result, instead the execution goes on never ending finally locking the database.
Surprisingly if the selected data from this view is put in a temporary table and that table is joined with the table to get the result, it works fine.
Could anybody please help me with this as creating a table every time would be slow procedure. Is there any restrictions related to views which may be I have ignored.
Thanx in advance.
Regards,
Sushma
Hey I have a terrible problem !!
I have a query, and It doesn't matter if it has finished, the table is still locked. Is there any clause to unlock the share mod lock (force) when the query has finished or any way to ensure that table has no locks to continue with another query or transaction ?
Could you give me any sentence ?
Thanks you !!
We have found deadlocks in our application. Deadlocks occure between SELECT and UPDATE. I get deadlock graph using profiler and find that SELECT makes SIU lock. Below you'll find SELECT statement:
select t1.*
from MyTable t1
--self join on field1 and field2
left outer join
(select field1, field2
[Code] ....
Why SIU lock is set?
Hi all ,
When i Run the report in reporting services, it locks the tables.
so is there any option to Unlock the tables. I m using just select query to run the report but when i run the report it locks the tables.
I used with(nolock) option in select query but it didnt work...still showing me lock on the tables.
Pls help...its urgent
Thanking You,
Rupali Rane.
Is anyone have already encountered such a problem :
When a table is locked by several locks (key, pag), either a SELECT request which does not need to lock any row cannot succeed.
In SQL Server Enterprise Manager, I see that my request is waiting for a lock "LCK_M_S" !!!
How I can avoid this kind of situation which seems to me completely abnormal.
I have never been faced with this kind of problem in Oracle.
Thanks for anyone who will help me to resolve this "bug".
Hi,
Let's assume the client code call a stored procedure which reads: SELECT * FROM myTable WHERE ID < 100. Let's assume that for whatever reason, the query becomes very slow and takes 60 seconds to complete. This 60 secs, could be the time for the DB engine to fetch all the rows (happening before returning the resultset to client code), or during the transfer of the resultset to client code (slow network throughput).
Question1: could this prevent another user from doing SELECT on myTable? (could be onn different ID or even overlapping the ID between 1 and 100).
Question2: could this prevent another user from performing write (UPDATE/DELETE) on the rows with ID between 1 and 100?
Question3: can another user perform a write (INS, DEL, UPD) on rows outside of the ID between 1 and 100?
Thanks in advance for any help.
I've got an INSERT that's selecting data from a linked server and attempting to push 10 million rows into the blank table. More or less, it looks like this:
insert into ReceivingTable (
Field1, Field2, Field3, Field4
, Field5, Field6, Field7, Field8
, Field9, Field10, Field11, Field12
, Field13, Field14, Field15
[code]...
The instance of the SQL Server Database Engine cannot obtain a LOCK resource at this time. Rerun your statement when there are fewer active users. Ask the database administrator to check the lock and memory configuration for this instance, or to check for long-running transactions. There are no other active users. I ran it again and monitored the following DMO to watch the growth of locks for that spid:
SELECT request_session_id, COUNT (*) num_locks
-- select *
FROM sys.dm_tran_locks
--where request_session_id = 77
GROUP BY request_session_id
ORDER BY count (*) DESC
The number of locks started small and held for a while around 4-7 locks, but at about 5 minutes in the number of locks held by that spid grew dramatically to more than 8 million before finally erroring again with the same message. Researching, I can't figure out why it's not escalating from row locks to table locks at the appropriate threshold. The threshold in was set to 0 at first (Server Properties > Advanced > Parallelism > Locks). I set it to 5000, and it still didn't seem to work. Rewriting the INSERT to include a WITH (TABLOCK) allows it to finish successfully in testing. My problem is that it's coming out of an ETL with source code that I can't edit. I need to figure out how to force it to escalate to locking the entire table via table or server level settings.
A colleague suggested that installing service packs may take care of it (the client is running SQL Server 2008 R2 (RTM)), but I haven't found anything online to support that theory.
Hi,my query is:SELECT a.symbol_art,b.node_keyFROM artykuly a, art_podz bWHERE a.symbol_art=b.symbol_art------------- -------------------table: artykuly table art_poda.symbol_art b.symbol_artAA-0001 AA-0001 = record okAA-0002 NULL = >>>>>>>>I want to view diferencerecords symbol_art in two tablesHow select all a.symbol_art where in table art_podz b.symbol_art is no exists?tnx.Tom
View 2 Replies View RelatedHello,
I hope someone can answer this, I'm not even sure where to start looking for documentation on this. The SQL query I'm referencing is included at the bottom of this post.
I have a query with 3 select statements joined together like tables. It works great, except for the fact that I need to declare a variable and make it a table within two of those 3. The example is below. You'll see that I have three select statements made into tables A, B, and C, and that table A has a variable @years, which is a table.
This works when I just run table A by itself, but when I execute the entire query, I get an error about the "declare" keyword, and then some other errors near the word "as" and the ")" character. These are some of those errors that I find pretty meaningless that just mean I've really thrown something off.
So, am I not allowed to declare a variable within these SELECT tables that I'm creating and joining?
Thanks in advance,
Andy
Select * from
(
declare @years table (years int);
insert into @years
select
CASE
WHEN month(getdate()) in (1) THEN year(getdate())-1
WHEN month(getdate()) in (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12) THEN year(getdate())
END
select
u.fullname
, sum(tx.Dm_Time) LastMonthBillhours
, sum(tx.Dm_Time)/((select dm_billabledays from dm_billabledays where Dm_Month = Month(GetDate()))*8) lasmosbillingpercentage
from
Dm_TimeEntry tx
join
systemuserbase u
on
(tx.owninguser = u.systemuserid)
where
Month(tx.Dm_Date) = Month(getdate())-1
and
year(dm_date) = (select years from @years)
and tx.dm_billable = 1
group by u.fullname
) as A
left outer join
(select
u.FullName
, sum(tx.Dm_Time) Billhours
, ((sum(tx.Dm_Time))
/
((day(getdate()) * ((5.0)/(7.0))) * 8)) perc
from
Dm_TimeEntry tx
join
systemuserbase u
on
(tx.owninguser = u.systemuserid)
where
tx.Dm_Billable = '1'
and
month(tx.Dm_Date) = month(GetDate())
and
year(tx.Dm_Date) = year(GetDate())
group by u.fullname) as B
on
A.Fullname = B.Fullname
Left Outer Join
(
select
u.fullname
, sum(tx.Dm_Time) TwomosagoBillhours
, sum(tx.Dm_Time)/((select dm_billabledays from dm_billabledays where Dm_Month = Month(GetDate()))*8) twomosagobillingpercentage
from
Dm_TimeEntry tx
join
systemuserbase u
on
(tx.owninguser = u.systemuserid)
where
Month(tx.Dm_Date) = Month(getdate())-2
group by u.fullname
) as C
on
A.Fullname = C.Fullname
We are migrating our database(s) from ORACLE to SQL. In Oracle we were able to issue a SELECT statement and see all of the locks (Blocking and Non-Blocking) currently in the system. The query also included the Process ID of the process we needed to kill in order to get rid of the lock.
We now need to create the same type of query for Microsoft SQL Server 2012. I have seen postings on different sites saying that this info can be obtained using SP_WHO2 or using the SQL Server Management Studio Activity Monitor's PROCESSES tab, but we are looking for a SELECT statement that will give us similar information.
How do I Query two tables and minus the result to be displayed in a gridview. I will appreciate all the help that I can get in this regard. Find below my two select statement
1st Select StatementDim SelectString As String = "SELECT DISTINCT [Course_Code], [Course_Description], [Credit_Hr], [Course_Type], [Course_Method] FROM [MSISCourses] WHERE (([Course_Type] = Core) OR ([Course_Type] = Information Integration Project) "If radBtnView.Checked = True ThenSelectString = SelectString & " OR ([Course_Type] = 'Knowledge')"End IfIf chkGView.Checked = True ThenSelectString = SelectString & " OR ([Specialization] = 'Data Management')"End IfIf chkGView2.Checked = True ThenSelectString = SelectString & " OR ([Specialization] = 'General')"End IfIf chkGView1.Checked = True ThenSelectString = SelectString & " OR ([Specialization] = 'Electronic Commerce')"End IfIf chkGView3.Checked = True ThenSelectString = SelectString & " OR ([Specialization] = 'Network Administration and Security')"End IfIf chkGView4.Checked = True ThenSelectString = SelectString & " OR ([Specialization] = 'Healthcare Information Systems')"End IfSqlDataSource3.SelectCommand = SelectString
2nd Select Statement"SELECT DISTINCT [Co_Code], [Co_Description], [Cr_Hr], [Co_Type], [Co_Method] FROM [StudentCourses] WHERE ([Co_Code] = StdIDLabel)"
my gridview<asp:GridView ID="GridView2" runat="server" AutoGenerateColumns="False" DataKeyNames="Course_Code" DataSourceID="SqlDataSource3" GridLines="Horizontal"><Columns><asp:BoundField DataField="Course_Code" HeaderText="Course_Code" ReadOnly="True" SortExpression="Course_Code" /> <asp:BoundField DataField="Course_Description" HeaderText="Course_Description" SortExpression="Course_Description" /> <asp:BoundField DataField="Credit_Hr" HeaderText="Credit_Hr" SortExpression="Credit_Hr" /> <asp:BoundField DataField="Course_Type" HeaderText="Course_Type" SortExpression="Course_Type" /> <asp:BoundField DataField="Course_Method" HeaderText="Course_Method" SortExpression="Course_Method" /> </Columns></asp:GridView>
Hi,
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 want to retrieve the data from table "Document" and i need to check the below condition using 3 tables.
Document.ID=Project.ID=Group.ID
Here Project and Group is an another table.
Query : Select Document.Name from Document, Group, Project where
Document.ID = Group.ID and Document.ID= Project.ID.
is this right a way?
In one query, I would like to query every user table in a specified database for
SELECT TOP (3) COUNT_BIG([Event Count]) AS EventNum, [Target IP], MAX([Time]) as LastSeen
GROUP BY [Target IP]
ORDER BY EventNum DESC
How is this possible?
Please give examples, I am a beginner.
Assume every table has the same structure for columns event count, target ip, and time.
Hey all,I'm having this weird problem on my Windows 2003 Server machine..Whenever I open two connection pages in Query Analyzer, then close oneof them, it locks up and I have to kill the task.I read a posting somewhere that said this could be due to an MDACinstallation problem, but I've run MDAC Component Checker and all filesare ok, version 2.8. Also, since I'm running Windows 2003 and MDAC 2.8is the latest, I can't reinstall it.There has to be some other cause for this. Why would QA lock up everytime I close a page?-John
View 11 Replies View RelatedI have three tables EmpIDs,EmpRoles and LatestRoles. I need to write a select Query to get roles of all employees present in EmpIDs table by referring EmpRoles and LatestRoles.
Where I stuck : The condition is first look into table EmpRoles and if it has more than one entry for a particular Employee ID than only need to get the Role from LatestRoles other wise consider the role from EmpRoles .
Example:
Create Table #EmpIDs (
EmplID int
)
Create Table #EmpRoles (
EMPID int,
[Code] ....
Employee ID 2 is having two roles defined in EmpRoles so for EmpID 2 need to fetch Role from LatestRoles table and for remaining ID's need to fetch from EmpRoles .
My Final Output of select query should be like below.
EmpID Role
1 Role1
2 Role2
3 Role1
Hi there,
I have a MS Access database (mdb) containing the following tables:
Crime
Criminal
CrimeCommitted
Hideout
CriminalType
The Criminal table contains information about each criminal and the CrimeCommitted table contains information about the specific crimes. I've written the following query to return only the latest crime committed by each criminal:
Code Snippet
SELECT Criminal.CriminalID, Criminal.Firstname, Criminal.Lastname, Criminal.Nickname, Criminal.Gender, Criminal.DOB, Criminal.Eyes, Criminal.Complexion, Criminal.Weight, Criminal.Height, Criminal.Build, Criminal.Scars, Criminal.Occupation, Criminal.CrimeOrgID, Criminal.IQ, Criminal.Hideout, Criminal.CriminalType, Max(CrimeComitted.Date) AS Last_Crime_Comitted
FROM Criminal INNER JOIN CrimeComitted ON Criminal.CriminalID=CrimeComitted.CriminalID
GROUP BY Criminal.CriminalID, Criminal.Firstname, Criminal.Lastname, Criminal.Nickname, Criminal.Gender, Criminal.DOB, Criminal.Eyes, Criminal.Complexion, Criminal.Weight, Criminal.Height, Criminal.Build, Criminal.Scars, Criminal.Occupation, Criminal.CrimeOrgID, Criminal.IQ, Criminal.Hideout, Criminal.CriminalType;
This query works fine for obtaining the Criminal table data, but once i've include CrimeCommitted.Country in the SELECT statement, the data returned contained all the crimes committed by each criminal (i just need the latest crime).
The query doesn't work when another table, other than Criminal, is selected. How can i obtain the columns in the CrimeCommitted table in this query?
What could be the query or the stored procedure to list locks or deadlocks ?
Thanks
How do I temporarily lock a database (read-only mode) programatically?
For example:
BeginTrans
//LOCK OUT ALL OTHER USERS
//Only the Server has Write access
CommitTrans
THANKS!
Our enterprise consists of a mix of mission-critical transaction-oriented applications. The ERP applications are accessed by 70 branch offices around the country. The network also carries file transfers, e-mail, and Web traffic. Each branch is linked to headquarters via a Frame Relay network with port speeds of 64Kbps.
We are facing problems when ERP database locks up and cause time-outs and frustrating messages such as: "User disconnected - unknown error."
Rachel
Greetings:
I've a stored procedure that grabs from a table all of the records that have a status = 2. Once these records are grabbed the same stored procedure needs to update the status of the records to 3. Something like this:
SELECT
*
FROM
[MyTable]
WHERE
Status = 2
UPDATE
[MyTable]
SET Status = 3
WHERE
Status = 2
What I'm afraid will happen is that between the running of the select statement and the running of the update statement that a record that originally had a status of 1 will be set to 2 - which means the record was never selected by the first half of the stored procedure but had its status updated to 3 in the second half of the stored procedure.
I thought at first wrapping all of this in a transaction would fix the problem but I've done some more reading and that doesn't seem to be the case. I need the Update to run on only those records the Select query grabbed no matter what else happens in the table.
Is there a lock to address this in a way that will allow other records (those not selected) to be updated to a value of 2 without them being updated to 3 when the Update query runs?
Hi all,
I have a few stored procedures which all perfom SELECT queries on a table in the database. Do these kind of stored procedures affect any other processes or procedures working on that table. I am talking about locks, blocks etc.
For example, the database has a table which gets updated periodically by some process which I don't know. Now I wrote some stored procedures just to do the SQL SELECT with some conditions in WHERE clause. Is there any possibility that my stored procedure failed and the because of this, the process that runs on the table was not executed?
Hi friends,I need to select columns for specific data from all tables in DataBasePls give me reply asap Regards,M.Raj
View 4 Replies View RelatedI am trying to clean up security. When I check tables in a specific database I see a list of users with select access. There are 1000+ tables in the database. I know I can do 'revoke select on table_name to user_name' ....
View 3 Replies View RelatedDear list,I am trying to get the names of the tables and the column names from thecode below for a database but it is not working. When I run the querybelow the column titles are delivered but there is no data. I think thismight be a premissions issue. Has anyone run into this before?Thanks in advance.Use Test_db/* Provides Table Name, Column Name, Extened Description */Select a.name as tbl_name, b.name as column_name, d.name as data_type,d.length as length, d.xprec as prec, d.scale as scale, b.usertype,b.scale, c.valuefrom sysobjects as a inner join syscolumns as b on a.id=b.id inner joinsysproperties as c on b.colid=c.smallid and a.id=c.idinner join systypes as d on b.xtype=d.xtype
View 2 Replies View RelatedHi, all experts here,
I encontered a problem which did not allow me to select any thing from the temparary tables of the tempdb database. (e.g one of the temparary tables is #239E4DCF), why is that and how can we solve this problem? As I urgently need to look at this tempdb database, it is full. I am looking forward to hearing from you and thanks a lot in advance for your help.
With best regards,
Yours sincerely,
The database is configured for single publisher, many subscribers,merge replication. The maintenance plan started to fail a couple ofmonths ago and the database would not get backed up. After clearingall the locks, I am able to backup the database manually. The locksreturn again and I'm not able to backup the database with themaintenance plan. How can I get around the lock issue or solve it sothat I can backup the database again?Thanks,Chris
View 1 Replies View RelatedHi,
I had application that access the database 'test'. Now i created a ETL package, in this Souce database is 'test' and destination database is 'mytest'. I have scheduled the job for every hour.
Now, i want to know that whether any locks will create on source database 'test' while ETL package is running.
Thanks
Dinesh
Hello all,
When I create a new database and replicate to it using BeginMonitoredBackgroundSync :
Code Block
public void BeginMonitoredBackgroundSync(string User)
{
CreateReplicationInstance(User);
repl.BeginSynchronize(
OnSimplifiedSynchronizeComplete,
SqlCeReplication_OnStartTableUpload,
SqlCeReplication_OnStartTableDownload,
SqlCeReplication_OnSynchronization,
repl);
}
private void CreateReplicationInstance(string User)
{
repl = new SqlCeReplication();
string host = repl.HostName;
repl.HostName = User;
string dbFilePath = "";
dbFilePath = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase) +
"\" + repl.HostName + ".sdf";
string myConnectionString = string.Format("Data Source = {0};PWD = {1}", dbFilePath, sqlSettings.Items["SqlPassword"]);
repl.InternetUrl = dynamicsReplicationSettings.ReplicationSettingsItems["InternetUrl"];
repl.PublisherSecurityMode = SecurityType.DBAuthentication;
repl.Publisher = dynamicsReplicationSettings.ReplicationSettingsItems["Publisher"];
repl.PublisherDatabase = dynamicsReplicationSettings.ReplicationSettingsItems["PublisherDatabase"];
repl.PublisherLogin = dynamicsReplicationSettings.ReplicationSettingsItems["PublisherLogin"];
repl.PublisherPassword = dynamicsReplicationSettings.ReplicationSettingsItems["PublisherPassword"];
repl.Publication = dynamicsReplicationSettings.ReplicationSettingsItems["Publication"];
repl.Subscriber = "RemoteSubscription" + repl.HostName;
repl.SubscriberConnectionString = myConnectionString;
repl.ConnectionRetryTimeout = 120;
repl.LoginTimeout = 120;
repl.CompressionLevel = 6;
if (File.Exists(dbFilePath))
{
FileInfo info = new FileInfo(dbFilePath);
if (info.Length <= 20480)
{
File.Delete(dbFilePath);
repl.AddSubscription(System.Data.SqlServerCe.AddOption.CreateDatabase);
}
}
else
{
repl.AddSubscription(System.Data.SqlServerCe.AddOption.CreateDatabase);
}
primeConnection();
}
After the replication finishes, I dispose the replication object like so:
Code Block
void OnAsyncSynchronizeComplete(IAsyncResult asyncResult)
{
try
{
repl.EndSynchronize(asyncResult);
if (repl != null)
{
repl.Dispose();
repl = null;
}
if (ReplicationComplete != null) ReplicationComplete(this, true);
}
catch(Exception ex)
{
if (ReplicationComplete != null) ReplicationComplete(ex, false);
}
}
Then later, if I try to update, insert or delete to the database, the application will hang. I can read from it, but I cannot write. If I close the application down and open it back up without replicating, I will not get any lockups. It also will not hang up after any replications prior to the create replication. I think I am doing something wrong in the initial replication that is holding on to some connection to the DB causing it to lock up. Has anyone seen anything like this before?
I have a sql snippet from a 3rd party application that will not complete its transaction. The SELECT statement executes but does not finish. Instead the statement just sits in AWAITING COMMAND for 1000 seconds then dies, thus killing the UPDATE statement that is supposed to follow.
The CROSS JOIN and CROSS APPLY seem suspect.
(
@p0 DATETIME,
@p1 INT,
@p2 INT,
@p3 NVARCHAR(4000),
@p4 INT,
[code]....
I just ran into an issue with cascading locks due to a SPID on one of my production servers. When researching the lock, I noticed that there was no sql text. SP_Who 2, nor the following query captured anything,
SELECT sqltext.TEXT
, sqlplan.query_plan
, req.session_id
, req.status
, req.command
[Code] ....
I spoke to the user causing the lock and he ran into a visual basic error when this occurred and didn't close out that window. So my guess is that it's due to an uncommitted transaction. However, shouldn't I still see something if that was the case?