Save Me From A CURSOR
Oct 3, 2007
Ok, I have a solution for this but it involves a cursor that will take 3 days to run. Please someone save me from this!
I have a table that contains 700,000 records. I need to update a field in this table with an integer to denote what set of records it belongs to. Basically if you look at the table in order by RowID, everytime the AcctNUM changes, the fieldtofill is incremented. The AcctNum will show up multiple times throughout the table.
Its a long story but the file we started with was junk and this is the only way out.
Here's an example of what needs to happen:
RowID AcctNUM FieldToFill
1 123 1
2 456 2
3 123 3
4 123 3
5 123 3
6 456 4
7 123 5
8 123 5
Right now I have a cursor that is steping through, checking the value of the last row, if its the same it gets that same number, if its different it increments the number and updates the row.
Its been running over two hours and only 25,000 or so records have been updated.
Is the cursor my only way out? I wish I had optimized the cursor a bit, as it making it a fast_forward or something. Would that shave off more time than the two and half hours already invested?
Thanks for you help!
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Dec 10, 2007
Hey all:
Right now I have a cursor that makes me want to puke. This is the last cursor in my current project and I want to replace it with a much faster set based operation.
Here is the problem. I have a table with say 1-3 million records. There are fields that get loaded in with date information. These fields are varchar because the date information could very well be mangled data that needs to be reviewed by a user. What I need is to go through these varchar fields and flag the values that cannot convert to smalldatetime.
I have another table that houses the primary key and the field of the record that cannot convert.
Essentially, I have a series of filters that run and flag using set based stored procedures. If there is a record that gets through that contains a value that cannot be converted, I have a cursor that steps through the data and attempts to convert the value. If it is able to be converted, then it continues on until it finds the value that is holding up the conversion.
I guess if I can run a query that will return all records that can convert for the field (or can't convert) I'd be all set. Any help here is appreciated.
--Thanks--
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Feb 11, 2006
Hello:I didn't find any documentation that notes save point names are casesensitive, but I guess they are...Stored Proc to reproduce:/* START CODE SNIPPET */If Exists (Select * From sysobjects Where Type = 'P' and Name ='TestSaveTran')Drop Procedure dbo.TestSaveTranGoCreate Procedure dbo.TestSaveTranAsBeginDeclare@tranCount int--Transaction HandlingSelect @tranCount = @@TRANCOUNTIf (@tranCount=0)Begin Tran localtranElseSave Tran localtranBegin Try--Simulate Error While ProcessingRAISERROR('Something bad happened', 16, 1)/*If this proc started transaction then commit it,otherwise return and let caller handle transaction*/IF (@tranCount=0)Commit Tran localtranEnd TryBegin Catch--Rollback to save pointRollback Tran LOCALTRAN --<< NOTE case change--Log Error--Reraise ErrorEnd CatchEndGo--Execute Stored ProcExec dbo.TestSaveTran/*Should receive the following message:Cannot roll back LOCALTRAN. No transaction or savepoint of that namewas found.*//* END CODE SNIPPET */What is really strange, if there is a transaction open, then no erroris thrown. So if you execute as so:/* START CODE SNIPPET */Begin Tran--Execute Stored ProcExec dbo.TestSaveTran/* END CODE SNIPPET */There is no "Cannot roll back LOCALTRAN...." message.Questions:1-)Can someone confirm save point names are case sensitve and this isnot happening because of a server setting?2-)Is this a logic error that I am not seeing in the example codeabove?We have changed our code to store the save point name in a variable,which will hopefully mitigate this "problem".Thx.
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Jun 26, 2007
I am new to sql sever management studio express, but a long time query analyzer user. This is a very basic question.
I want to change the default directory in sql server management studio express so that when I go to save a query, it is already pointed to the correct one. Where do I change that?
Thanks,
Nanci
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Aug 12, 2015
In MSDN file I read about static cursor
STATIC
Defines a cursor that makes a temporary copy of the data to be used by the cursor. All requests to the cursor are answered from this temporary table in
tempdb; therefore, modifications made to base tables are not reflected in the data returned by fetches made to this cursor, and this cursor does not allow modifications
It say's that modifications is not allowed in the static cursor. I have a questions regarding that
Static Cursor
declare ll cursor global static
for select name, salary from ag
open ll
fetch from ll
while @@FETCH_STATUS=0
fetch from ll
update ag set salary=200 where 1=1
close ll
deallocate ll
In "AG" table, "SALARY" was 100 for all the entries. When I run the Cursor, it showed the salary value as "100" correctly.After the cursor was closed, I run the query select * from AG.But the result had updated to salary 200 as given in the cursor. file says modifications is not allowed in the static cursor.But I am able to update the data using static cursor.
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Jul 20, 2005
Hello,I have a test database with table A containing 10,000 rows and a tableB containing 100,000 rows. Rows in B are "children" of rows in A -each row in A has 10 related rows in B (ie. B has a foreign key to A).Using ODBC I am executing the following loop 10,000 times, expressedbelow in pseudo-code:"select * from A order by a_pk option (fast 1)""fetch from A result set""select * from B where where fk_to_a = 'xxx' order by b_pk option(fast 1)""fetch from B result set" repeated 10 timesIn the above psueod-code 'xxx' is the primary key of the current Arow. NOTE: it is not a mistake that we are repeatedly doing the Aquery and retrieving only the first row.When the queries use fast-forward-only cursors this takes about 2.5minutes. When the queries use dynamic cursors this takes about 1 hour.Does anyone know why the dynamic cursor is killing performance?Because of the SQL Server ODBC driver it is not possible to havenested/multiple fast-forward-only cursors, hence I need to exploreother alternatives.I can only assume that a different query plan is getting constructedfor the dynamic cursor case versus the fast forward only cursor, but Ihave no way of finding out what that query plan is.All help appreciated.Kevin
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Sep 20, 2007
I'm trying to implement a sp_MSforeachsp howvever when I call sp_MSforeach_worker
I get the following error can you please explain this problem to me so I can over come the issue.
Msg 16958, Level 16, State 3, Procedure sp_MSforeach_worker, Line 31
Could not complete cursor operation because the set options have changed since the cursor was declared.
Msg 16958, Level 16, State 3, Procedure sp_MSforeach_worker, Line 32
Could not complete cursor operation because the set options have changed since the cursor was declared.
Msg 16917, Level 16, State 1, Procedure sp_MSforeach_worker, Line 153
Cursor is not open.
here is the stored procedure:
Alter PROCEDURE [dbo].[sp_MSforeachsp]
@command1 nvarchar(2000)
, @replacechar nchar(1) = N'?'
, @command2 nvarchar(2000) = null
, @command3 nvarchar(2000) = null
, @whereand nvarchar(2000) = null
, @precommand nvarchar(2000) = null
, @postcommand nvarchar(2000) = null
AS
/* This procedure belongs in the "master" database so it is acessible to all databases */
/* This proc returns one or more rows for each stored procedure */
/* @precommand and @postcommand may be used to force a single result set via a temp table. */
declare @retval int
if (@precommand is not null) EXECUTE(@precommand)
/* Create the select */
EXECUTE(N'declare hCForEachTable cursor global for
SELECT QUOTENAME(SPECIFIC_SCHEMA)+''.''+QUOTENAME(ROUTINE_NAME)
FROM INFORMATION_SCHEMA.ROUTINES
WHERE ROUTINE_TYPE = ''PROCEDURE''
AND OBJECTPROPERTY(OBJECT_ID(QUOTENAME(SPECIFIC_SCHEMA)+''.''+QUOTENAME(ROUTINE_NAME)), ''IsMSShipped'') = 0 '
+ @whereand)
select @retval = @@error
if (@retval = 0)
EXECUTE @retval = [dbo].sp_MSforeach_worker @command1, @replacechar, @command2, @command3, 0
if (@retval = 0 and @postcommand is not null)
EXECUTE(@postcommand)
RETURN @retval
GO
example useage:
EXEC sp_MSforeachsp @command1="PRINT '?' GRANT EXECUTE ON ? TO [superuser]"
GO
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Sep 25, 2007
part 1
Declare @SQLCMD varchar(5000)
DECLARE @DBNAME VARCHAR (5000)
DECLARE DBCur CURSOR FOR
SELECT U_OB_DB FROM [@OB_TB04_COMPDATA]
OPEN DBCur
FETCH NEXT FROM DBCur INTO @DBNAME
WHILE @@FETCH_STATUS = 0
BEGIN
SELECT @SQLCMD = 'SELECT T0.CARDCODE, T0.U_OB_TID AS TRANSID, T0.DOCNUM AS INV_NO, ' +
+ 'T0.DOCDATE AS INV_DATE, T0.DOCTOTAL AS INV_AMT, T0.U_OB_DONO AS DONO ' +
+ 'FROM ' + @DBNAME + '.dbo.OINV T0 WHERE T0.U_OB_TID IS NOT NULL'
EXEC(@SQLCMD)
PRINT @SQLCMD
FETCH NEXT FROM DBCur INTO @DBNAME
END
CLOSE DBCur
DEALLOCATE DBCur
Part 2
SELECT
T4.U_OB_PCOMP AS PARENTCOMP, T0.CARDCODE, T0.CARDNAME, ISNULL(T0.U_OB_TID,'') AS TRANSID, T0.DOCNUM AS SONO, T0.DOCDATE AS SODATE,
SUM(T1.QUANTITY) AS SOQTY, T0.DOCTOTAL - T0.TOTALEXPNS AS SO_AMT, T3.DOCNUM AS DONO, T3.DOCDATE AS DO_DATE,
SUM(T2.QUANTITY) AS DOQTY, T3.DOCTOTAL - T3.TOTALEXPNS AS DO_AMT
INTO #MAIN
FROM
ORDR T0
JOIN RDR1 T1 ON T0.DOCENTRY = T1.DOCENTRY
LEFT JOIN DLN1 T2 ON T1.DOCENTRY = T2.BASEENTRY AND T1.LINENUM = T2.BASELINE AND T2.BASETYPE = T0.OBJTYPE
LEFT JOIN ODLN T3 ON T2.DOCENTRY = T3.DOCENTRY
LEFT JOIN OCRD T4 ON T0.CARDCODE = T4.CARDCODE
WHERE ISNULL(T0.U_OB_TID,0) <> 0
GROUP BY T4.U_OB_PCOMP, T0.CARDCODE,T0.CARDNAME, T0.U_OB_TID, T0.DOCNUM, T0.DOCDATE, T3.DOCNUM, T3.DOCDATE, T0.DOCTOTAL, T3.DOCTOTAL, T3.TOTALEXPNS, T0.TOTALEXPNS
my question is,
how to join the part 1 n part 2?
is there posibility?
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Oct 5, 2004
I'm new to cursors, and I'm not sure what's wrong with this code, it run for ever and when I stop it I get cursor open errors
declare Q cursor for
select systudentid from satrans
declare @id int
open Q
fetch next from Q into @id
while @@fetch_status = 0
begin
declare c cursor for
Select
b.ssn,
SaTrans.SyStudentID,
satrans.date,
satrans.type,
SaTrans.SyCampusID,
Amount = Case SaTrans.Type
When 'P' Then SaTrans.Amount * -1
When 'C' Then SaTrans.Amount * -1
Else SaTrans.Amount END
From SaTrans , systudent b where satrans.systudentid = b.systudentid
and satrans.systudentid = @id
declare @arbalance money, @type varchar, @ssn varchar, @amount money, @systudentid int, @transdate datetime, @sycampusid int, @before money
set @arbalance = 0
open c
fetch next from c into @ssn, @systudentid, @transdate, @type, @sycampusid, @amount
while @@fetch_status = 0
begin
set @arbalance = @arbalance + @amount
set @before = @arbalance -@amount
insert c2000_utility1..tempbalhistory1
select @systudentid systudentid, @sycampusid sycampusid, @transdate transdate, @amount amount, @type type, @arbalance Arbalance, @before BeforeBalance
where( convert (int,@amount) <= -50
or @amount * -1 > @before * .02)
and @type = 'P'
fetch next from c into @ssn, @systudentid, @transdate, @type, @sycampusid, @amount
end
close c
deallocate c
fetch next from Q into @id
end
close Q
deallocate Q
select * from c2000_utility1..tempbalhistory1
truncate table c2000_utility1..tempbalhistory1
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Jul 20, 2005
I having a difficult time here trying to figure out what to do here.I need a way to scroll through a recordset and display the resultswith both forward and backward movement on a web page(PHP usingADO/COM)..I know that if I use a client side cursor all the records get shovedto the client everytime that stored procedure is executed..if thisdatabase grows big wont that be an issue?..I know that I can set up a server side cursor that will only send therecord I need to the front end but..Ive been reading around and a lot of people have been saying never touse a server side cursor because of peformance issues.So i guess im weighing network performance needs with the client sidecursor vs server performance with the server side cursor..I am reallyconfused..which one should I use?-Jim
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May 20, 2007
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Feb 27, 2007
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Mar 4, 2004
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{
SqlConnection CON = new SqlConnection(@"Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|Database1.mdf;Integrated Security=True;User Instance=True");
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sheraz
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Apr 6, 2006
I want to save a picture uploaded by the user in BIT in Sql Database ... Help me
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Jun 27, 2006
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Oct 11, 2007
Hai, Im using Sql server 2000. Im writing appliction to do Batch Update, meaning updating more than one row in single database call..
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Mar 26, 2008
Hi ,
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Feb 21, 2006
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Oct 27, 2006
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Sep 1, 2006
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May 4, 2008
I haven't downloaded nor installed it but I have some general questions about it:
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I'm looking forward to your answer!
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May 14, 2007
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Sep 20, 2006
Using ASP.net I need to be able to save and retrieve PDF Files in SQL.I believe the best way to do this is through a BLOB datatype.I have been searching (without luck) for a tutorial/code sample explaining how to do this.Any help would be greatly appreciated.Chrisp.s. I know many prefer to store the files on the server and simply store pointers to the files in SQL, but I need to store the actual files in SQL.
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Jul 11, 2007
i have an xml file, it looks like this:
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Oct 10, 2007
how do you store a datareader propety to a variable? Below is my current code. I have already declared my connectionString and sqlComm objects, as well as the userName and such. I need to store the value from the dr to the variables, UserName, UserPass, and serverName. ThanksTry
sqlCon.Open()
dr = sqlComm.ExecuteReader
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Finally
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End Try
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Jan 30, 2008
Hi All,
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