NEW COLUMN BEHAVES MYSTERIOUSLY
Apr 25, 2007
I select these columns:
TABLEONE: SEC
TABLETWO: B_DATE and E_DATE (they are numbers – not dates); RATE (is a number)
I first calculate the difference between E_DATE and B_DATE and between a chosen date and B_DATE
creating the new columns GG_CED_C and GG_MAT_C.
These new columns are calculated perfectly (they make the difference
between the two dates according to the 30/360 date count convention) and don’t give me any problems. They are all filled with numbers.
I’m able to use these new columns to make other calculations. For example I succeed in calculating
RATE/GG_CED_C* GG_MAT_C
but if I try to calculate
RATE/360*GG_MAT_C AS RATEO
the result is that in some records I have my new column RATEO correctly calculated, while in some other records there is no value in the column.
For example:
B_DATE E_DATE RATE GG_CED_C GG_MAT_C RATEO
20061229 20070630 3,995 180 90 0,99875
20061229 20070630 4,185 180 90
Dates are identical and so are GG_CED_C and GG_MAT_C: why don't
I have the result in the second record????
SELECT
SEC, B_DATE, E_DATE, RATE, GG_CED_C, GG_MAT_C,
RATE/ 360 * GG_MAT_C AS RATEO
FROM (
SEC, B_DATE, E_DATE, RATE, GG_CED_C, GG_MAT_C
(YEAR2 - YEAR1)*360 + (MONTH2 - MONTH1)*30 + (DAY2 - DAY1) AS GG_CED_C,
(YEARRIL - YEAR1)*360 + (MONTHRIL - MONTH1)*30 + (DAYRIL - DAY1) AS GG_MAT_C,
FROM (
SELECT
A.SEC, , B_DATE, E_DATE, RATE,
TRUNC(B_DATE/10000,0) AS YEAR1 ,
TRUNC(MOD(B_DATE,10000)/100,0) AS MONTH1 ,
CASE
WHEN MOD(B_DATE,1000)= 229 THEN 30
WHEN MOD(B_DATE,1000)= 228
AND MOD(TRUNC(B_DATE/10000,0),4) > 0 THEN 30
ELSE MIN(MOD(B_DATE,100),30)
END AS DAY1,
TRUNC(E_DATE/10000,0) AS YEAR2 ,
TRUNC(MOD(E_DATE,10000)/100,0) AS MONTH2 ,
CASE
WHEN MOD(E_DATE,1000)= 229 THEN 30
WHEN MOD(E_DATE,1000)= 228
AND MOD(TRUNC(E_DATE/10000,0),4) > 0 THEN 30
ELSE MIN(MOD(E_DATE,100),30)
END AS DAY2,
TRUNC(&DRIL/10000,0) AS YEARRIL ,
TRUNC(MOD(&DRIL,10000)/100,0) AS MONTHRIL ,
CASE
WHEN MOD(&DRIL,1000)= 229 THEN 30
WHEN MOD(&DRIL,1000)= 228
AND MOD(TRUNC(&DRIL/10000,0),4) > 0 THEN 30
ELSE MIN(MOD(&DRIL,100),30)
END AS DAYRIL,
FROM TABLEONE A, TABLETWO C
What's happening?
After what I've seen in this query I'm wondering if SQL is reliable
when it comes to calculations (after all its main duty is to query data and not to make calculations among them)(?????.
Please give an explanation to this mystery.
Thank you.
Anna - Verona (Italy)
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Aug 6, 2007
Our Transactions/sec counter jumped quite a bit when we moved to SQL Server 2005. The move coincided with increased load so we didn't think anything of it until recently. Upon further review, the counter just seems too high.
There was an article in SQL Server magazine a few years ago by Brian Moran where he states, "Transactions/sec doesn't measure activity unless it's inside a transaction. Batch Requests/sec measures all batches you send to the server even if they don't participate in a transaction." He goes on to say that Transactions/sec will be skewed lower because it is a subset of Batch Requests/sec. (http://www.sqlmag.com/Article/ArticleID/26380/sql_server_26380.html)
The article was written for SQL Server 2000. We conducted tests in 2000 and found what he said to be right on the money. SELECT statements increased Batch Requests/sec, but not Transactions/sec. UPDATE/INSERT/DELETE statements increased both in lockstep. Makes perfect sense so far.
We conducted the same tests in 2005 and found a radically different story. While SELECT statements behaved the same, UPDATE/INSERT/DELETE statements showed Transactions/sec skyrocket 2-10x more than Batch Requests/sec for the duration of the statement. In other words, a single transaction submitted by our application fires off exponentially more transactions than the one we submitted. I was unable to pinpoint exactly what these "hidden" transactions were actually doing. Is this something that occurred in 2000 but simply wasn't reported? Or is it new behavior in 2005?
While trying to answer these questions we noticed a second strange behavior in 2005. When no queries are being executed the Transactions/sec counter still jumps every six seconds like clockwork. And these phantom transactions number in the thousands. We tried to use profiler to capture what SQL was being executed, but nothing shows up in any SQL Statement or Batch event. However, when we turned on the SQLTransaction event we found it, sort of. An object called GhostCleanupTask runs every six seconds causing thousands of transactions. We don't know exactly what it is doing, but we noticed that it ran consistently on some databases, but never on other databases. Both sets of databases are identical and in use.
So, all of this investigation leads me with three final questions.
1. What is behind all the extra transactions caught by perfmon when I submit a single transaction?
2. What is GhostCleanupTask and why does it take so many transactions? (And why does it only run on certain databases?)
3. If a potential customer asks for our Transactions/sec count, is it accurate to give them the big number, knowing that our application is only actually submitting a fraction of that? On the other hand, the system apparently is actually doing that many transactions. (For instance, on our production server during peak, Batch Requests/sec is about 4,000, while Transactions/sec hits 26,000.
Any insight would be much appreciated.
3P
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TITLE: Connect to Server
------------------------------
Cannot connect to 74.***.***.**sqlexpress.
------------------------------
ADDITIONAL INFORMATION:
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) (Microsoft SQL Server, Error: -1)
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http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=2093921&SiteID=1
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MODIFY
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ALTER procedure [dbo].[MyPro](@StartRowIndex int,@MaximumRows int)
As
Begin
Declare @Sel Nvarchar(2000)set @Sel=N'Select *,Row_number() over(order by myId) as ROWNUM from MyFirstTable Where ROWNUM
Between ' + convert(nvarchar(15),@StartRowIndex) + ' and ('+ convert(nvarchar(15),@StartRowIndex) + '+' + convert(nvarchar(15),@MaximumRows) + ')-1'
print @Sel
Exec Sp_executesql @Sel
End
--Execute Mypro 1,4 --->>Here I Executed
Error
Select *,Row_number() over(order by myId) as ROWNUM from MyFirstTable Where ROWNUM
Between 1 and (1+4)-1
Msg 207, Level 16, State 1, Line 1
Invalid column name 'ROWNUM'.
Msg 207, Level 16, State 1, Line 1
Invalid column name 'ROWNUM
Procedure successfully created but giving error while Excuting'.
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SET ANSI_NULLS ON
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SET QUOTED_IDENTIFIER ON
GO
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[Code] ....
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DECLARE @TSQL varchar(255)--Contains the code to be executed
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DECLARE @dropc varchar(255)-- Drop constraint script
[Code] ....
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ALTER TABLE [dbo].[DTb_HWSQueueMonthEnd] Alter Column [Patient System Number] varchar(10)
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Msg 8111, Level 16, State 1, Line 1
Cannot define PRIMARY KEY constraint on nullable column in table 'DTb_HWSQueueMonthEnd'.
Msg 1750, Level 16, State 0, Line 1
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Posted - 09/10/2007 : 15:53:26
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'**********************************************************************
' Visual Basic Transformation Script
'************************************************************************
' Copy each source column to the destination column
Function Main()
DTSDestination("CM") = Month(Now)
DTSDestination("CY") = Year(Now)
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End Function
***********************************************************
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