Table And Query Hints Not Working In SSCE 3.1 ?
Aug 23, 2007
I am trying to use hints and they don't seem to be working.
Something like:
select * from TABLE_NAME with (tablock,xlock)
fails.
Documentation clearly states that this is supported (TABLOCK, NOLOCK, XLOCK, etc.), so I must be missing something simple.
Please let me know how do I use Hints in SQL Server 2005 Compact.
Thanks.
PS.
I am using C#. It doesn't work in my code when I use
SqlCeDataReader rs = cmd.ExecuteReader();
And it doesn't work from inside the VS 2005 "query tool" or whatever it is called, when you do "Connect to Database" and so on.
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Sep 12, 2005
My experience with query hints are that they are just that, a hint. What I don't understand is when does SQL decide to ignore your hint?
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Sep 29, 2003
Please advise.
Whilst running a query I recieved the error below.
Cannot create a worktable row larger than allowable maximum. Resubmit your query with the ROBUST PLAN hint.
What is ROBUST PLAN hint?.
Help Appreciated.
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Dec 3, 2007
Do you know of a way, in the OLE DB Command (Executing a sql command for each record), to specify a lock hint?
Example: in my component, I want to update a table but I want to specify a ROWLOCK or UPDLOCK hint.
When I try using this sql statement in the 'SqlCommand' property:
UPDATE DIM_Accounts WITH (UPDLOCK)
SET COL1 = ''
SSIS gives a syntax error.
Do you know any workarounds?
Thanks!
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Oct 26, 2006
Greetings,
I have two tables:
CustomerOrder
----
ID
CustomerID
StatusID
CustomerOrderDetail
----
ID
Order_ID
StockID
Quantity
CustomerOrderDetail table has clustered unique index for ID and non-clustered for Order_ID
SQL Server 2005 is using table scan for CustomerOrderDetail table When I user the following query:
select
cod.*
from CustomerOrder co
inner join CustomerOrderDetail cod ON cod.Order_ID = co.ID
where
co.StatusID = 8 -- Pending
Both of the tables are pretty big, detail table has more than million records, so scanning the table is a bad idea.
When I specify hint to use index then sql seeks, but how do I make SQL server to use index automatically? I don't want to use hints in my queries.
Thanks!
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Jun 16, 2004
Is there anything equivalent available in SQL Server for Oracle HINTS ?
eg : Oracle query
select /* + INdex(sno index1) */ sno from test_table
Thanks,
Sam
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Jul 23, 2005
I am kind of confused about the way SQL Server 2000 handles the hintsthat users supply with their SQL statements.[color=blue]>From BOL, it seems that one can specify them with "WITH (...)" clauses[/color]in SQL statements known as table hints. Sometimes, multiple uses ofthis form in a statement is OK. Then there is the OPTION clause forspecifying statement hints. However, the documentation on OPTIONsection discourages their use.Being relatively new to SQL Server and still learning about it, what isthe general practice? Use hints or not? And if so, how (through WITHor OPTION clauses)?Cheers!
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May 15, 2001
I am running SQL7 SP2 and and noticing table the query processor table scans when I ussue a between 'date1' and 'date2' instead of using the datetime index. If I put in the index hint (index = ix_datetimeXXXX) the query runs fine. My question is does this index hint restict the use of other indexes in the query and secondly how can I specify multiple index hints? Thanks in advance.
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May 1, 2007
Hi
My VB.Net (with SQL Server backend) application currently allows more than one user to look at a particular record at the same time. This is not a problem unless both those users also try to update that record as well. One user's changes then overwrite the other's.
I've been reading up on locking hints but my database knowledge is a little scant and I'm also rather dense and need things spelling out for me!! So I have a few questions that I hope someone can help with:
If I add an updlock to my update SQL statement, this would allow both users to view the record but would only allow one user's changes through. Is that correct?
For the other user, would SQL Server return an error message that I can use to tell the user that their update has not worked?
Would I have to get my VB.NET application to re-get the record information so that the user who's update failed can see the changes made by the other user and reapply their own changes?
Does the updlock become unlocked once the record is updated or do I need to specifically unlock it somehow?
Thanks!
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Apr 20, 2007
I am having problems with doing what seams to be a very easy query. For some reason the SQL Server is trying to do nested loops instead of hash join. I tried to force the use of the hash join using the join hint.
Query 1
select *
from DIM_DATE DD
inner hash join (
select A.student_key,
CONVERT(int, CONVERT(varchar, COALESCE (A.date_withdrawn, getdate()), 112)) AS date_withdrawn_current
FROM FACT_STUDENT AS A
) SSE on DD.date_key= date_withdrawn_current
This query gives an error:
Msg 8622, Level 16, State 1, Line 1
Query processor could not produce a query plan because of the hints defined in this query. Resubmit the query without specifying any hints and without using SET FORCEPLAN
Second query is not really what I want but it illustrate that it works fine when getdate() is not used.
Query 2
select *
from DIM_DATE DD
inner hash join (
select A.student_key,
CONVERT(int, CONVERT(varchar, COALESCE (A.date_withdrawn, A.date_enrolled), 112)) AS date_withdrawn_current
FROM FACT_STUDENT AS A
) SSE on DD.date_key= date_withdrawn_current
Is there some problem with using function getdate() ? It works fine in SQL Server 2000
This problem occurs on the SQL Server 2005 SP2 ( 9.00.3050.00 (X64) )
and (9.00.2050)
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Mar 19, 2006
I noticed that the online books say the following:
Note The SQL Server query optimizer automatically makes the correct determination. It is recommended that table-level locking hints be used to change the default locking behavior only when necessary.
Also, at another place in online books, it says:
The table hints are ignored if the table is not accessed by the query plan.
From the above, it seems that using locking hints is not going to guarantee that SQL Server will follow them. Is this true?
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Sep 9, 1998
Hi,
Why SQL server dose work as follows when I dose not provide any join hints?
It looks like HASH join is the best plan, but SQL dose not. What kind of
JOIN method is used by SQL optimizer?
Thanks in advance,
Wonhyuk William Chung
wonhyukc@usa.net
MCSE/ MCT
-----------
use northwind
go
select orderid, CompanyName --productname,
from orders o inner join customers c on o.customerID = c.CustomerID
/*
Table `Orders`. Scan count 91, logical reads 184, physical reads 0,
read-ahead reads 0.
Table `Customers`. Scan count 1, logical reads 1, physical reads 0,
read-ahead reads 0.
.0553
*/
select orderid, CompanyName --productname,
from orders o inner hash join customers c on o.customerID = c.CustomerID
/*
hash
Table `Customers`. Scan count 1, logical reads 1, physical reads 0,
read-ahead reads 0.
Table `Orders`. Scan count 1, logical reads 4, physical reads 0, read-ahead
reads 0.
.115
*/
select orderid, CompanyName --productname,
from orders o inner merge join customers c on o.customerID = c.CustomerID
/*
merge
Table `Customers`. Scan count 1, logical reads 4, physical reads 1,
read-ahead reads 3.
Table `Orders`. Scan count 1, logical reads 4, physical reads 0, read-ahead
reads 0.
.115
*/
select orderid, CompanyName --productname,
from orders o inner loop join customers c on o.customerID = c.CustomerID
/*
loop
Table `Customers`. Scan count 830, logical reads 1681, physical reads 0,
read-ahead reads 0.
Table `Orders`. Scan count 1, logical reads 5, physical reads 0, read-ahead
reads 0.
.116
*/
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Sep 3, 1999
I need to use two hints (INDEX=indexname) and (NOLOCK).
I've tried
(INDEX=indexname),(NOLOCK)
(INDEX=indexname,NOLOCK)
(INDEX=indexname)(NOLOCK)
and nothing works.
Thanks
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Aug 5, 1999
While investigating performance problems within an application recently I carried out some tests using SET SHOWPLAN ON.
I had a query like this within a stored procedure:
SELECT MAX(X) FROM Y WHERE Z LIKE @MYVAR
Where @MYVAR was passed in. I discovered that SQL Server did a Table Scan even when Z had an index on it. A problem with 200,000 rows!
If I said
SELECT MAX(X) FROM Y WHERE Z LIKE 'HELLO%'
(i.e., used a constant instead of a variable) SQL Server did use the index correctly and did not do a table scan.
I got around this by rewriting my statement:
SELECT MAX(X) FROM Y (INDEX=MYINDEX) WHERE Z LIKE @MYVAR
in other words by manually specifying the index I had created on the Z column.
Hope this helps someone.
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Feb 9, 2008
hi all,
I'm trying to run queries on relatively small tables (a few hundred thousand rows) with subqueries of counts per primary key columns as such:
(ColA in tableA is the primary key)
select * from tableA p
where exists (select 1 from ( select ColA, count(1) cnt
from TableA
group by ColA
having count(1)>1 ) t
where t.ColA= p.ColA)
order by some_col
my problem is that sqlserver 2005 sp5 does not materialize the internal subquery properly, or execute it beforehand and it gets confused as heck and pegs the CPUs at 100% forever.
What hints can I use to solve this issue?
I've tried to use ..... "with ...." to prepare/materialize the table upfront, no luck, one version of statement pegged one cpu at 100%, while the other statement pegged ALL cpu's at 100% -- don't remember which.
My only solution right now was to create these subqueries as PHYSICAL tables -- and this would solve the problem but that would entail creating a lot of un-necessary objects.
thanks much for any feedback!!
Cos
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Jul 23, 2001
Hello.
There is a trace flag that tells SQL Server to ignore index hinting in incoming queries. I'm having a Monday morning problem and I can't remember the trace number nor find it in my notes. Can anyone else come up with it?
Thanks in advance,
-darin
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Aug 18, 2006
have a dts package that does txt -> sql server.
i have 200 txt files with the same exact format.
just want to know if i can write a SP passing a parameter that loads this txt files. because i dont wanna create 200 packages or 200 sources to load 200 txt files.
say:
exec SP_loadTXT txt1
or should i use bulk insert?
any approaches are fine. any suggestions are fine too.
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Dec 3, 2007
I've got a SELECT WITH (UPDLOCK, ROWLOCK) WHERE followed by an UPDATE WHERE statement. The results of the SELECT statement are deserialized in C# and updates are made to the deserialized object. Then the object is serialized back into the table with the UPDATE statement. I've got this code running within a transaction scope with the ReadCommited isolation level.
My service receives requests to update data and the requests can come in on different threads. What I'm seeing, is that once in a while, the log messages from my application indicate that two different threads are able to issue the above SELECT statement and both are receiving results. This is a problem since the thread that issues the last UPDATE will overwrite the changes made by the first. Each thread has its own connection and transaction scope.
I've researched all over the place and have tried a few different things, but all things point to the fact that query hints are just hints and that SQL may or may not pay attention to them. If that's the case, how am I suppose to perform a SELECT with the intention of updating so that no one else can do the same? I haven't tried table level locking, but I'd really like to avoid that if possible.
-Mike
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Apr 4, 2007
Hi
Does anyone have an example code in C++ to create a SSCE db and access data?
Many thanks
Ozzie
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Jul 14, 2006
Hi,
Using Merge replication, I have a table that is filtered using the HOST_NAME() function. The filter also makes use of a function (as the HOST_NAME() is overriden to return some complex data).
Everything replicates and filters just fine. but when I add a join filter on a different table (the join filter is a simple foreign key join) I get the following error when the snapshot agent is run:
Message: Conflicting locking hints are specified for table "fn_GetIDList". This may be caused by a conflicting hint specified for a view.
Command Text: sp_MSsetup_partition_groups
Parameters: @publication = test1
fn_GetIDList is the function used in the original filter.
Thanks for any help
Graham
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Jul 25, 2006
Hi,
I would like to implement a kind of standard packages which can be used in all other processes and will be started using the variables.
But I do not know where to store these kind of packages in "best practise", because we
- would like to use them in Dev and in "Real" also without having to change something in the other processes
- we are storing the packages in the folders of the package store
and as far as I understood I would have to share the package store to all developers though that they would be able to do this?
Then I would better choose another folder with defined access rights I think...
Or would it be better to spend some time in developing a custom component?
But this component would work with recordsets rather than the standard data flow elemtents and therefor I would expect a leak of performance...
Or is it possible to do "trasnformation" from a packae to a custom component?
Thanks in advice!
cheers,
Markus
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Jul 31, 2007
hi,
this is my first post here, i am using Sql Server CE 2005 these days.
in a project i found 2 problem that can't find any solution for them till now , maybe there are some bugs i founded them
here is :
1- when i have a SqlCeCommand Object and the ComandText for it is "Update [Term] SET Year=? WHERE _id=? AND name=? "
the problem is in here , i added parameters for this command, if value of parameter is in Unicode ( i tested it in Farsi[Persian] language value like 'زمستان' on 'name' parameter) , in ExcuteNonQuery() method , it throws FormatException with "Input String was not a correct format".
although if i change the value of 'name' parameter to something non-unicode (for example i tested it with 'ABCDE' ) it works correctly,
i think SqlCeCommand in UPDATE query , have problem with unicode values in paramteres.
2- second one is so strange for me !! , i have a loop that update a column in a table. and then have another loop that update the next column of that table. for example first i update the column 3 in loop, then in another loop i update the column 4.
after all, the value of column 4 and 3 is substituted, it means that values that i updated for column 3 is in column 4 , and values that i updated for column 4 is in column 3 !!!!!!!
both columns is in 'int' type.
and the last point is i tested both of this situations in SQL Server 2000 Developer Edition and both worked correctly without any problem.
also i used SQL Server CE v3.1 with .Net framework 2.0 in Vs2005 and C#.
is there any missing i'v done or is it some kind of bugs.
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May 16, 2007
We are looking into developing our application using SQL Server Compact and have created a test database to become familiar with the API. Having read about ACID transactions in SSCE we would like to know how this is actually employed. What will happen if a power failure occurs during a transaction? Does this have to be recovered in the code?
I have read the following article: http://msdn2.microsoft.com/en-us/library/csz1c3h7.aspx, but is this the best way to deal with transaction failures?
I can't find any examples on how to recover from failures in transactions in SSCE.
Any help would be greatly appreciated.
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Jun 11, 2007
Hi,
Are there any pecularities of Transaction Logs in SSCE comparing to the same log in full scale SQL Server? How are they stored? And when they are considered to be expired in order to safely delete them?
Thanx in advance
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May 18, 2007
i'm use this code ,in SQL2005 std and ACCESS database, it work
but if i use SSCE ,it's throw a OleDbException in ExecuteScalar()
Exception : OleDbException
0x80040E30L
DB_E_BADTYPENAME
Code Snippet
OleDbConnection od = new OleDbConnection("Provider=Microsoft.SQLSERVER.MOBILE.OLEDB.3.0;Data Source=db.sdf;SSCE:Database Password=");
od.Open();
OleDbCommand og = new OleDbCommand("INSERT INTO [bills] ([billno],[checkouttime],[finalprice],[handle],[ischeckout],[memo],[paymode],[trick]) VALUES (@billno,@checkouttime,@finalprice,@handle,@ischeckout,@memo,@paymode,@trick)", od);
og.Parameters.Add("@billno", OleDbType.VarWChar).Value = "2007051800000000";
og.Parameters.Add("@checkouttime",OleDbType.DBTimeStamp).Value="2007-5-18 11:55:40";
og.Parameters.Add("@finalprice", OleDbType.Single).Value = 0.0;
og.Parameters.Add("@handle", OleDbType.VarWChar).Value = "admin";
og.Parameters.Add("@ischeckout", OleDbType.SmallInt).Value = 0;
og.Parameters.Add("@memo", OleDbType.VarWChar).Value = "";
og.Parameters.Add("@paymode", OleDbType.VarWChar).Value = "";
og.Parameters.Add("@trick", OleDbType.VarWChar).Value = "";
og.ExecuteScalar();
od.Close();
why the same code is not work? i'm find all MSDN ,but there is no answer
Who can help me,Thanks
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Nov 17, 2007
Hi-
VS 2008 supports targeting different versions of the .NET Framework. Will this apply to SSCE as well? I have some older apps that I want to keep in .NET 2 and SSCE 3.1. But I would also like to develop new stuff in 3.5. Will the targeting mechanism in VS 2008 support using SSCE 3.1 with .NET 2.0 and SSCE 3.5 with .NET 3.5?
Thanks.
-Gary
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Aug 5, 2007
I have been having "fun" trying to get all the bits (SSCE 3.5, Orcas Beta 2, SQL Managment Studio) in Vista 64 and Xp 32.
So far I have found at the SQLMetal does work with SSCE 3.5 but not in Vista64
BUT I cannot get any tool (tried SQL and SLQ express) to manage my SSCE db - ie make relationshipos so that SQLMatal can do its stuff
Any advice as to which tool to use to manage SSCE 3.5
Thanks
Mike
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Apr 25, 2008
This article instructed me on how to process rows from a table used as a data queue for multiple processes.
http://www.mssqltips.com/tip.asp?tip=1257
I tested this against the AdventureWorks DB (SQL 2005) and multiple SQL connections inside of Sql Mgmt. Studio).
Connection1:
BEGIN TRANSACTION
SELECT TOP 1 * FROM Production.WorkOrder WITH (updlock, readpast) --skips over locked rows
--COMMIT TRANSACTION
Connection2:
BEGIN TRANSACTION
SELECT TOP 1 * FROM Production.WorkOrder WITH (updlock, readpast) --skips over locked rows
COMMIT TRANSACTION
This works like I want where connection 2 skips over the locked row from connection 1 and gets the next available record from the table / queue. However, when I add ORDER BY tsql to each sql statement, connection 2 is now blocked waiting for Connection 1 to commit. (This is not what I want)
Connection1:
BEGIN TRANSACTION
SELECT TOP 1 * FROM Production.WorkOrder WITH (updlock, readpast) order by DueDate
--COMMIT TRANSACTION
Connection2:
BEGIN TRANSACTION
SELECT TOP 1 * FROM Production.WorkOrder WITH (updlock, readpast) order by DueDate --is blocked until connection 1 commits transaction
COMMIT TRANSACTION
How do I prevent blocking when using these locking hints with ORDER BY?
thanks
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Nov 22, 2007
Does anybody have the RTM build numbers for SQL Server Compact Edition 3.5?
Thanks
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Sep 20, 2007
Could y'all please clarify this statement with some examples:
"A SQL Server Client Access License (CAL) is required for any connection to SQL Server, including a connection from SQL Server Compact Edition."
Is this only referring to RDA, or is it referring to data replication by any means? Is there any restrictions for connections between SSCE devices?
Thanks!
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Apr 2, 2008
I've just recently downloaded Visual Studio 2008 Express which comes with SQL Server 2005 Express and SQL Server Compact 3.5, both of which were installed when I installed the products.
I've been following the tutorial videos and trying some stuff of my own and I just can't seem to get a Compact 3.5 database to actually update! I'm doing EXACTLY what is shown in the tutorials and th dataset is being updated - changes and added records - and they will show up in a DataGrid control as expected, but when I accept the changes - nothing is changed and/or added to the actual .sdf file. When I open it again, it's the same as it was before. Using exactly the same code but with an SQL Server 2005 Express database (.mdf), updates are fine.
First I created a dataset that connects to the SSCE 3.5 database .SDF file. Then I simply drag the table from the dataset to the form which creates Dataset, Table Binding Source, Table Adapter Manager and BindingNavigator items, in addition to the toolbar and DataGrid controls. The code generated from this is below. I have added the Try/Catch block and messages to see if any errors are ocurring.
Code Snippet
Public Class Form3
Private Sub TblMessageTypeBindingNavigatorSaveItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TblMessageTypeBindingNavigatorSaveItem.Click
Me.Validate()
Me.TblMessageTypeBindingSource.EndEdit()
Try
Me.TableAdapterManager.UpdateAll(Me.AppMessagesDataSet)
MsgBox("Changes Saved")
Catch ex As Exception
MsgBox(ex.ToString)
End Try
End Sub
Private Sub Form3_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'TODO: This line of code loads data into the 'AppMessagesDataSet.tblMessageType' table. You can move, or remove it, as needed.
Me.TblMessageTypeTableAdapter.Fill(Me.AppMessagesDataSet.tblMessageType)
End Sub
End Class
When I run the app, the data in the database table is displayed correctly. If I make a change and add a record then click the Save button, I get the expected "Changes Saved" message indicating that there are no errors. When I look a the contents of the table, the changes and additions did not happen and the data is exactly the way it was before.
I had the full SQL Serer 7.0 installed as well so I thought there might be a conflict or something became corrupted. In uninstalled SQL Server 7.0, SQL Server 2005 Express and SQL Server Compact 3.5. I "repaired" VB 2008 Express which reinstalled SQL Server Compact 3.5 and separately reinstalled SQL Server 2005 Express. Same problem.
As I mentioned above, what gets me is that if I use the same setup for a SQL Server 2005 Express database, changes and inserts work just fine. (Used the Northwind.mdf (Express) and the Northwind.sdf (Compact) sample databases and created my own sample .mdf and .sdf databases - same results.)
I've looked at whatever I can to see if I can find the problem but just can't put my finger on it. Very frustrating.
Does anyone have any advice on what I might be doing wrong with Compact or if there is something I've missed or if there's a property somewhere that needs to be set, or perhaps a configuration issue??
Many thanks,
Ben
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Nov 20, 2007
I just installed VS2008 RTM and noticed that it really wants me to use 3.5 instead of 3.1. As I am doing most of my SSCE work through the SQL Server 2005 Management Studio (its query editor is still far superior to VS'), I found that I can still use 3.1 without much trouble (so long as I manually browse and add the 3.1 reference to my project).
That said, I'd like to use 3.5. My two questions are:
- Is the SSCE 3.5 version included in VS2008 final? I noticed the dlls are all over a month old. Can I redistribute these with my app?
- Will there be support in SQL 2005 or SQL 2008 for connecting to 3.5 databases? I know that a new SQL server 2008 CTP was released, but haven't seen mention of SSCE support. I'd really hate to lose the great query editor of the Management Studio when moving to 3.5.
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Dec 11, 2007
Howdy folks,
I may have stumbled upon the most obscure bug imaginable. I was noticing my parameterized queries were failing on our SBC (WinCE5 x86), but not on our WinCE5 x86 emulator, WinXP setup, or WinCE5 ARMIV emulator. After much grief, I discovered the source of the problem had to do with a call to ICommandWithParameters::GetParameterInfo().
On all platforms other than our SBC, the DBPARAMINFO::ulParamSize was (correctly) retrieved as 16B for type DBTYPE_DBTIMESTAMP. On the SBC this value was retrieved as 8B. Now I know that natively all platforms of SSCE store a datetime object in 8B, but a DBTIMESTAMP structure (16B) is what's always used to transfer those fields to and from the database. Needless to say, with the wrong ulParamSize being returned, my data buffer (which used DBTIMESTAMP's) was being overwritten.
The erroneous value can be seen in this image
Just to further the case that this is a bug, the column size of a datetime field is correctly retrieved as 16B on the same platform when GetColumnInfo is run, as shown here.
Do y'all have any insight in this matter?
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