No Data Exists For The Row/column (InvalidOperationException) After A Number Of Reads...
Nov 30, 2006
I've been looking around for some kind of known issue or something, but can't find anything. Here's what I'm experiencing:
I have a table with about 50,000 rows. I open several connections and use a command to ExecuteResultSet against each command, with CommandType.TableDirect, CommandText set to the name of the table, and IndexName set to various indexes. In the end, I have several SqlCeResultSet instances which are then maintained for the life of the AppDomain.
In a loop, I call SqlCeResultSet.Read() on one of the instances, and if it returns false, I call SqlCeResultSet.ReadFirst() - essentially creating a circular pass through the result set.
In a Visual Studio debug session, this approach goes swimmingly for a short time, and then after a successful Read(), I'm pegged with an InvalidOperationException (text: "No data exists for the row/column") for a column which was succesfully read on the previous Read(). If, in the immediate window, I call SqlCeResultSet.Read() again on the result set instance, the Get___ methods work as they had been in the previous reads.
It seems like the internal state of the ResultSet is getting corrupted somehow, but it is opaque to me. Any insights on why this suddenly throws this exception?
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Jul 10, 2015
Ok, I'm looking to get counts on historical data where the number of records exists between two dates with different years. The trick is the that the dates fall in different years. Ex: Give me the number of records that are dated between 0ct 1, 2013 and July 1, 2014.
A previous post of mine was similar where I needed to get records after a specific date. The solution provided for that one was the following. This let me get any records that occured after May 1 per given Fiscal year.
SELECT
MAX(CASE WHEN DateFY = 2010 THEN Yr_Count ELSE 0 END) AS [FY10],
MAX(CASE WHEN DateFY = 2010 THEN May_Count ELSE 0 END) AS [May+10],
MAX(CASE WHEN DateFY = 2011 THEN Yr_Count ELSE 0 END) AS [FY11],
MAX(CASE WHEN DateFY = 2011 THEN May_Count ELSE 0 END) AS [May+11],
MAX(CASE WHEN DateFY = 2012 THEN Yr_Count ELSE 0 END) AS [FY12],
[Code] ....
I basically need to have CASE WHEN MONTH(OccuranceDate) between Oct 1 (beginning year) and July 1 (ending year).
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Jul 27, 2007
Hi,
Can any of can explain, what the "Reads" column in Profiler exactly mean ? I'm not comfortable with the explanation given in BOL.
"The number of read operations on the logical disk that are performed by the server on behalf of the event. These read operations include all reads from tables and buffers during the statement's execution"
For the same procedure with same parameters, if the server is not loaded much, the Reads are in a few hundreds, but when there are more than 1000 concurrent users, why it is going to millions ? What other parameters affecting this reads ? And how can I reduce it ?
Environment: SQL Server 2005 64-bit Enterprise Edition on Windows Server 2003 R2 Server x64 Enterprise Edition SP2
Thanks in Advance.
Regards
Babu
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Apr 17, 2007
I'm running the same query on two different PCs and tracing results in Profiler on my PC. When executing the query on PC1 - the total number of reads is 200000. When executing the same query on PC2 - the toal number of reads is 13000. It is almost 15 times more reads when executing query on PC2. The executed query is same on PC1 and PC2. Any reason for this?
I'm trying to analyse that query and reduce the number of logical reads as it's is too high but then I get completly different result on different PC.
Thanks.
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Apr 17, 2007
I'm using an application that produce 48000000 reads for one stored procedure and 170 seconds to complete. The same procedure when executed in SQL Analyzer takes only one seconds and 10000 reads.
What is happening here? Where should I look to solve this problem?
Thanks
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Jun 2, 2014
I am writing a performance baseline test.
The first test writes 5000000 rows in one table. I realise this is not representative OLTP behaviour, but it worked me to start interpreting performance counters and to test several setups to be discussed with our server, storage and network administrators. This way we have been able to compare the results of different hard disks, Lun vs vmdk, 1GB vs 10GB network, AMD vs Intel, etc. This way I can also compare several SQL setups (recovery model, max memory config, ...)
The screenshot shows the results of 2 runs on the same server : Win2012R2, SQL2014, 16GB RAM.
In test 1 min/max server memory was set to 9215MB/10751MB
In test 2 min/max server memory was set to 13311MB/14847MB
The script assures the number of bytes inserted in the nvarchar columns is always the same.
This explains why the number of pages and the number of MB in the table are the same at the end of the 2 tests (column 5 and 6)
Since ca 13GB has to be written, the results of test 1 show the lead time is increasing once more than 10GB has been inserted (column 8 and 9) In addition you can see at that moment
- buffer cache hit ratio is decreasing
- page life expectance becomes "terrible"
- free list stall/sec increases
- lazy writes/sec increases
- readlatency increases (write latency does not)
In test 2 (id 3 in column 1 in the screenshot) those counters are not really influenced (since the 5000000 rows can all be stored in memory).
Now what I do not understand is :
Why the number of pages read (instance level) as well as the number of bytes read and the number of reads (databaselevel) is increasing extremely during run 1.
I expected to see serious impact on write behavior, since SQL server is forced to start flushing dirty pages once memory is filled. Well actually you can see here the number of writes (not the the number of bytes written) starts to increase faster in test 1 after 4000000 rows, but there's no real impact on write latency.
Finally I want to notice
- I'm the only user on this machine
- the table has a clustered index on a identity column
- there are no foreign key constraints
- inserts are executed using a loop, not one big transaction
- to monitor progress and behaviour/impact, each 10.000 loops the counters are stored using dmv queries
So I wonder why SQL Server starts to execute so many reads in test 1.
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Aug 19, 2015
Is the SQL Server Profiler Reads Column Incorrect For Parallel Plans?
I often use profiler as one tool to identify bad plans. The reads column gives me a good indication of excessive IO to dig into and correct if necessary. I often use it with Showplan so I can see what a query does, replicate it and fix it.
However I have just lost some faith in it. I am looking at a poorly performing query joining five tables. A parallel plan has been generated and one table is being scanned (in parallel) due to a missing index. This table had in excess of 4 million rows in it. The rest hitd indexes well. However the entire query generates ONLY 12 READS.
Once corrected, a single processor plan is used. This looks really efficient and uses 120 reads. That looks the right figure to me.
Does the profiler only display one thread of a parallel plan perhaps? Or something else?
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Aug 19, 2015
I often use profiler as one tool to identify bad plans. The reads column gives me a good indication of excessive IO to dig into and correct if necessary. I often use it with Showplan so I can see what a query does, replicate it and fix it.
However I have just lost some faith in it. I am looking at a poorly performing query joining five tables. A parallel plan has been generated and one table is being scanned (in parallel) due to a missing index. This table had in excess of 4 million rows in it. The rest hitd indexes well. However the entire query generates ONLY 12 READS.
Once corrected, a single processor plan is used. This looks really efficient and uses 120 reads. That looks the right figure to me.
Clearly 12 reads is wrong. Does the profiler only display one thread of a parallel plan perhaps? Or something else?
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Nov 20, 2014
I need splitting one column data into number of columns.
Name. Below are the sample of names
Doxycycline 200 mg capsule
Effexor 100 mg tablet
Duragesic 50 mcg/hr Transderm Patch
Ambien CR 6.25 mg Tab
My desired results are below..
name dosemeasmisc
Doxcycline200mgcapsule
Effexor 100mgtablet
Duragesic 50mcgTransderm Patch
Ambien CR 6.25mgTab
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Jun 10, 2003
is there any way to find the number of sqlservers exists (count and name of server) in a network using sql statement or stored procedure
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May 25, 2015
I have a table which has 2 columns and the data is like below
API_Number Group_Name
1234 Group A
3241 Group A
1234 Group B
4567 Group C
7896 Group D
3241 Group E
I wanted to find the API numbers which are repeating in different groups. In the output I want
API_Number Group_Name
1234 Group A,Group B
3241 Group A,Group E
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Sep 25, 2007
I have a policy table which has policyNumbers and createDate. I need to retrieve all rows where createDate is between 2 dates and there is more than 1 row with the same policy number. I cannot figure out the SQL to return all policy number rows if there are more than 1 row with the policy. Most policies number will be in the table once. I need the others.
Thanks for suggestions.
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Sep 11, 2007
Posted - 09/10/2007 : 15:53:26
Hey all - got a problem that seems like it would be simple (and probably is : )
I'm importing a csv file into a SQL 2005 table and would like to add 2 columns that exist in the table but not in the csv file. I need these 2 columns to contain the current month and year (columns are named CM and CY respectively). How do I go about adding this data to each row during the transformation? A derived column task? Script task? None of these seem to be able to do this for me.
Here's a portion of the transformation script I was using to accomplish this when we were using SQL 2000 DTS jobs:
'**********************************************************************
' Visual Basic Transformation Script
'************************************************************************
' Copy each source column to the destination column
Function Main()
DTSDestination("CM") = Month(Now)
DTSDestination("CY") = Year(Now)
DTSDestination("Comments") = DTSSource("Col031")
DTSDestination("Manufacturer") = DTSSource("Col030")
DTSDestination("Model") = DTSSource("Col029")
DTSDestination("Last Check-in Date") = DTSSource("Col028")
Main = DTSTransformStat_OK
End Function
***********************************************************
Hopefully this question isnt answered somewhere else, but I did a quick search and came up with nothing. I've actually tried to utilize the script component and the "Row" object, but the only properties I'm given with that are the ones from the source data.
thanks in advance!
jm
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Jun 22, 2015
I'm executing a stored procedure but got error :
Msg 213, Level 16, State 1, Procedure ExtSales, Line 182
Column name or number of supplied values does not match table definition.
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Jun 1, 2007
we had some slow down complaints lately and this query seems to be the culprit almost every single time. The estimated execution plan is a clustered index seek as there is a clustered index on the uidcustomerid column. setting profile statistics on shows that every time it executes it does an index seek.
profiler session showed a huge number of reads for these queries depending on the value being looked up. 1500 through 50000. i set up profile io on and the culprit is lob logical reads. everything else is 0 or very low. in this case lob logical reads is over 1700.
3 of the columns in the select statement are text columns. when i take them out of the query the lob logical reads drops to 0 and goes up incrementally as i add each column back in.
is there anyway to improve the performance without changing data types to varchar(max)?
select SID,Last_name,Name_2,First_name,Middle_initial,Descriptives,Telephone_number,mainline,Residence,ADL,
DID_number,Svce_street,Svce_town,Svce_state,Svce_appt,Mailing_street,Mailing_town,Mailing_state,Mailing_appt,
Mailing_zip,Listing,Addl_listing,Published,Listed,Gold_number,PIN,status,SSnumber,tax_jurisdiction,
Bill_date,Past_balance,Service_start_date,Service_end_date,LOA,FCC_type,Line_type,I_W,Jacks,Voice_messaging,
vms_ring_cycles,CCS,phonesmarts,ringmate,voice_dialing,Bill_detail,Contact_Number,Contact_extension,
Best_Time,suspend,suspend_start,suspend_end,credits_allowed,credits_granted,home_region,Calling_Plan,Local_Plan,
Local_Plan_Rate,Flat_Rate,Sales_agent,Community,Building_Mgmt,How_Heard,Incentive_1,Incentive_1a,Incentive_1b,
Incentive_1c,Incentive_2,Incentive_2a,Incentive_2b,Incentive_2c,Incentive_3,Incentive_3a,Incentive_3b,
Incentive_3c,block_operator,block_collect,block_group,block_adult,block_call_return,block_repeat_dialing,
block_call_trace,block_caller_id,block_anonymous,block_all_high_toll,block_regional_and_ld,block_DA_Call_Completion,
block_DA,block_3rd_party,bank,prepayment,dial_around_number,custid,waive_interest,Financial_Treatment,
Other_Feature_1_code,Other_Feature_1_rate,Other_Feature_2_code,Other_Feature_2_rate,Other_Feature_3_code,
Other_Feature_3_rate,Other_Feature_4_code,Other_Feature_4_rate,Partial_Account,mail_date,snp_1_date,snp_2_date,
terminate_date,snp1notified,snp1peak,snp1offpeak,snp2notified,snp2peak,snp2offpeak,avg_days_paid,Pulled_Ld,SNP1,
SNP2,Treatment,Collections,Installment,Nynex_BTN,LD_rate,local_discount,to_month,rounds_up,full_package_made,
local_made,PIC,LPIC,tax_exempt_local,tax_exempt_federal,CommissionedAgent,LDRateID,UidCustomerId,
accVchLineClassUSOC,block_Inter_Reg_LD,block_international,block_DA_3rd_Collect,block_DH2,block_ISP_2,block_ISP_3,
block_ISP4_3_GBAS,block_ISP3_3_GBAS,block_collect_only,block_LD_Reg_DA,block_usage_based,block_ISP5_3_GBAS,
block_ISP5_2_GBAS,block_group_adult,csr_PIC,csr_LPIC,csr_SA,csr_exception,cutover_status,cutover_datetime,
OutsideAgent,prfVchAttributes,uidResellerID,Category,uidDealID
from profiles where UidCustomerID in (352199267)
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Sep 10, 2015
I have a single table that consist of 4 columns. Entity, ParamName, ParamsValue and ParamiValue. This table stores normalized Late Fee related parameters for apartments. The Entity field contains a code that identifies the apartment complex. The ParamName in a textual field that contains the name of the parameter that the other 2 fields define the value for; ParamsValue and ParamiValue. If the Late Fee parameter (as named in ParamName is something numerical then the value for that parameter can be found in ParamiValue else its in ParamsValue.
I don't know if 'Pivot' is the correct term to use for describing what I am trying to do because I've looked at the Pivot examples and I don't see how that will work for this. Using the Table and data as provided below, how would I construct a query so that I get 1 row per Entity in which the columns are the ParamsValue or ParamiValue for the ParamName listed in the column header (for the query)?
Below is the DDL to create the table and populate it.
USE [DBA_UTIL]
CREATE TABLE [dbo].[PARAMEXAMPLE](
[Entity] [varchar](16) NULL,
[Code]....
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Dec 9, 2013
I have SQL Server 2012 SSIS. I have Excel source and OLE DB Destination.I have problem with importing CustomerSales column.CustomerSales values like 1000.00,2000.10,3000.30,NotAvailable.So I have decimal values and nvarchar mixed in on Excel column. This is requirement for solution.However SSIS reads only numeric values correctly and nvarchar values are set as Null. Why?
CREATE TABLE [dbo].[Import_CustomerSales](
[CustomerId] [nvarchar](50) NULL,
[CustomeName] [nvarchar](50) NULL,
[CustomerSales] [nvarchar](50) NULL
) ON [PRIMARY]
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Nov 30, 2005
Hello
How do you check if a column exist ?
for a table :
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[myTable]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[myTable]
GO
but I dont find it for a column
Thank you
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Feb 5, 2007
Well, actually, as in the title. I have a table. The script should add a column if that column doesn't exist already. I use VB to combine the two queries. So what I want:
Query1: Does the column exists:
if No,
query2: create the column
How can I achieve this?
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Feb 4, 2004
Hi
Can anybody tell me how can I find whether a column exists in my table or not???
Piyush
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Jun 22, 2007
How to check to make sure a column does not exist before adding it? Be nice to do this in t-sql code instead of using ado.net. It seems as if the IF NOT EXISTS is not supported in SqlCe 3.1? I am trying to do this but I get the token error:
IF NOT EXISTS (
select *
from Information_SCHEMA.columns
where Table_name='authors' and column_name='NewColumn'
)
select 'no'
Is there a list of all CE supported t-sql commands?
Thanks,
Dan
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Dec 11, 2007
Hi,I am getting the Following Error Before Inserting data into the table..System.InvalidOperationException: The ConnectionString property has not been initialized. at System.Data.SqlClient.SqlConnection.PermissionDemand() at System.Data.SqlClient.SqlConnectionFactory.PermissionDemand(DbConnection outerConnection) at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) at System.Data.SqlClient.SqlConnection.Open() at DAL.Insert_Query(Label lblError, String sqlQuery)----------------------------------------------------Below is my Code Dim dal As New DAL
dal.P_ConnStr = Session.Item("ConnStr")
dal.Insert_Query(lblError, "Insert Into app_Session ([SessionID],[TimeIn]) Values('" & Session.SessionID & "', '" & System.DateTime.Now & "')")
'-------
'DAL
'------
Public Property P_ConnStr() As String
Get
Return ConnStr
End Get
Set(ByVal value As String)
ConnStr = value
End Set
End Property
Public Function Insert_Query(ByVal lblError As Label, ByVal sqlQuery As String) As Boolean
Dim insertCommand As SqlClient.SqlCommand
Try
'lblError.Visible = False
insertCommand = New SqlClient.SqlCommand(sqlQuery, Me.CreateConnection)
insertCommand.Connection.Open()
insertCommand.ExecuteNonQuery()
insertCommand.Connection.Close()
Return True
Catch ex As Exception
lblError.Visible = True
lblError.Text = ex.ToString
insertCommand.Connection.Close()
Return False
End Try
End Function ---------------------------------------------------------------------------How I can Resolve this Problem..
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Mar 11, 2004
Hi
I wrote code that connects to a SQL Server database in VB .NET
The program connects to the server and works fine.
dConnection = New SqlConnection(getCfgProperty(fPropDBConnection))
dConnection.Open()
However when I put my code on to a different machine (test server) the program can not open the connection. It gives an exception in the
dConnection.Open() line:
System.InvalidOperationException: The ConnectionString property has not been initialized.
at System.Data.SqlClient.SqlConnection.Open()
at Project4.HowTo.Samples.ADONET.ReportDistributor.di stributeReports()
Connection string is correct.
Is there something that has to be configured on test server environment?
Thanx
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Dec 18, 2005
I have a database table called Qlinks, with two columns, URL and Name. This table is displayed on a form also called qlinks, in a details view. When I try to save data after i've deleted a row of the table, O get a yellow po-up telling me that the InvalidOperationException was unhandled. The error is "Update requires a valid DeleteCommand when passed DataRow collection with deleted rows." Please try to help, I am just a beginning programmer who doesn't know much. Code samples greatly appreciated. Thanks in advance.
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Jul 12, 2007
i need to check that the column exist in the table if yes the update/insert value in the column else i need to add the new column like new browser name in the table.
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Jul 27, 2004
Hi there,
Is there a quick way to list all the tables in a DB that contain a certain column name?
Thanks
S
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Jun 13, 2008
I am trying
IF OBJECT_ID(''tempdb..#tempTable.Column'') IS NOT NULL
But its returning me a null every time. Is there any other way to check if column exists in temporary table.
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Nov 1, 2007
I'm trying to write a script that would only update a column if it exists.
This is what I tried first:
IF EXISTS (SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'Enrollment' AND COLUMN_NAME = 'nosuchfield')
BEGIN
UPDATE dbo.Enrollment SET nosuchfield='666'
END
And got the following error:
Server: Msg 207, Level 16, State 1, Line 1
Invalid column name 'nosuchfield'.
I'm curious why MS-SQL would do syntax checking in this case. I've used this type of check with ALTER TABLE ADD COLUMN commands before and it worked perfectly fine.
The only way I can think of to get around this is with:
IF EXISTS (SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'Enrollment' AND COLUMN_NAME = 'nosuchfield')
BEGIN
declare @sql nvarchar(100)
SET @sql = N'UPDATE dbo.Enrollment SET nosuchfield=''666'''
execute sp_executesql @sql
END
which looks a bit awkward. Is there a better way to accomplish this?
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Jan 29, 2008
The code below stops as I try to open a connection. I get the following error:
ServerVersion = 'sqlConnection1.ServerVersion' threw an exception of type 'System.InvalidOperationException'
string qry = "";
qry = string.Format("insert into dbo.member(mbrFirstName, mbrLastName, mbrStreetAddress, mbrPostalAddress, mbrTelephoneNumber, mbrTelephoneJob, mbrEmail) values('{0}','{1}','{2}','{3}','{4}','{5}','{6}')", sql1, sql2, sql3, sql4, sql5, sql6, sql7);
cmd.CommandText = qry;
cmd.Connection = sqlConnection1;
sqlConnection1.Open(); //Code stops here!!!
cmd.ExecuteNonQuery();
sqlConnection1.Close();
Does anyone know what is wrong? I appreciate any help!
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Jul 23, 2015
When I execute the below queries it works perfectly where as my expectation is, it should break.
Select * from ChildDepartment C where C.ParentId IN (Select Id from TestDepartment where DeptId = 1)
In TestDepartment table, I do not have ID column. However the select in sub query works as ID column exists in ChildDepartment. If I do change the query to something below then definately it will break -
Select * from ChildDepartment C where C.ParentId IN (Select D.Id from TestDepartment D where D.DeptId = 1)
Shouldn't the default behavior be otherwise? It should throw error if column doesnt exists in sub query table and force me to define the correct source table or alias name.
create table TestDepartment
(
DeptId int identity(1,1) primary key,
name varchar(50)
)
create table ChildDepartment
(
Id int identity(1,1) primary key,
[Code] ....
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Jul 27, 2007
I have a table in which a non-primary key column has a unique index on it.
If I am inserting a record into this table with a duplicate column value for the indexed column, then what will be the error number of the error in above scenario? OR How could I find this out?
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Jul 20, 2005
Hello All,Is there a way to run sql select statements with column numbers inplace of column names in SQLServer.Current SQL ==> select AddressId,Name,City from AddressIs this possible ==> select 1,2,5 from AddressThanks in Advance,-Sandeep
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Mar 17, 2008
I am using VWD2005 and SQLExpress 2005. In web.config I define the connection:<connectionStrings>
<add name="ProFeeRevenueUser" connectionString="Data Source=.SQLEXPRESS;AttachDBFilename=|DataDirectory|ProFeeRevenue.mdf; Initial Catalog=ProFeeRevenue;User Id=whomever;Password=whatever" providerName="System.Data.SqlClient"/>
When I try this code in a class (util.cs), I get an error on trying to open the connection:System.Data.SqlClient.SqlConnection cn = new System.Data.SqlClient.SqlConnection(ConfigurationManager.ConnectionStrings["ProFeeRevenueUser"].ConnectionString);
System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand("usp_UserSystemRolesListByUser", cn);System.Data.SqlClient.SqlDataReader dr;
try
{cmd.CommandType = System.Data.CommandType.StoredProcedure;
System.Data.SqlClient.SqlParameter retValParm = cmd.Parameters.Add("@RowCount", System.Data.SqlDbType.Int);retValParm.Direction = System.Data.ParameterDirection.ReturnValue;cmd.Parameters.AddWithValue("@UserLogin", userLogin);
cn.Open(); // error occurs here <<----------------------------
dr = cmd.ExecuteReader();if (dr.HasRows)
{while (dr.Read() == true)
{string MyRole = dr[1].ToString().Trim();
SystemRoles.Add(MyRole);
}
dr.Close();
}
It works fine if I point to a SQL server database on my server, but not with SQLExpress, so I assume I have done something wrong with the connection string or the SQL Express database. Any ideas?
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