Alternatives To CURSORs
Apr 3, 2004
Hi all
I have often come across discussions on this forum saying that CURSORs are expensive in time (processing power?).
Having used CURSORs to processing a mere 2000+ record (not much at all) which took a fair while to complete, I now realize why you guys are saying CURSORs are expensive.
But is there alternatives to using CURSORs in the situation where I try to process every records returned by a particular query?
Say for example, i want to update columns that comes from different tables for every record that is returned by a SELECT JOIN query. there is no way that i can do that with a single UPDATE statement cause i can't do JOIN with UPDATE query.
All comments welcome
James :)
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Jul 23, 2005
Hi,I have an SQL assignment to do and at my school we use SQL *Plus therehowever I don't have Oracle at home, where I would like to do the work ,so Iwas wondering whats the easiest way to get an SQL environment up so I cancode in that then just paste it into SQL *Plus later.I don't really want to install Oracle on my home pc and I was wondering ifthere are other IDE's for SQl that would fit my need for this.I discovered an instant SQL *Plus client that sounded really promising butwhen i unpacked it, it was just a load of dll's so I think it wasn't what Ithought it was.So does anyone know of anything that might be able to help me out here?Any advice much appreciated!Thanks--Ant
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Nov 7, 2000
Is using some variation of (i forget which... Charindex / Patindex) operator better than using a query with a like operator.
Our app requires wildcard searching. So what is the absolute best way to get the searches done fast???
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Sep 30, 2005
Hi all
Hope someone in here can help me solve a problem im having with a view.
I'm tring to build a view that show me the sales history for any given machine in a Machine Database (MDB). Each machine is handled as a seperate "project".
My query works fine as long as a machine has only been sold once ... but as soon as the machine is being sold as used to another customer the view fails because of my "subqueries" return more then one value.
(Error message: Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.)
I hope someone in here has a ideer on how to get the information I need out - because my CASE statements clearly dosn't do the trick.
--------------------------------------------------------
SELECT crm5.contact.name AS Customer,
crm5.pmembtype.name AS Ownership,
crm5.pv_salespress.InstallationDate AS [Install Date],
CASE
WHEN (SELECT crm5.pv_salespress.comptr1_Winner FROM crm5.pv_salespress) = 1 THEN (SELECT crm5.pv_salespress.comptr1_Used FROM crm5.pv_salespress)
WHEN (SELECT crm5.pv_salespress.comptr2_Winner FROM crm5.pv_salespress) = 1 THEN (SELECT crm5.pv_salespress.comptr2_Used FROM crm5.pv_salespress)
WHEN (SELECT crm5.pv_salespress.comptr3_Winner FROM crm5.pv_salespress) = 1 THEN (SELECT crm5.pv_salespress.comptr3_Used FROM crm5.pv_salespress)
ELSE (SELECT crm5.pv_salespress.Used FROM crm5.pv_salespress)
END AS Used,
CASE
WHEN (SELECT crm5.pv_salespress.comptr1_Winner FROM crm5.pv_salespress) = 1 THEN (SELECT crm5.comptr.name FROM crm5.comptr WHERE crm5.comptr.comptr_id = crm5.pv_salespress.comptr1_seller)
WHEN (SELECT crm5.pv_salespress.comptr2_Winner FROM crm5.pv_salespress) = 1 THEN (SELECT crm5.comptr.name FROM crm5.comptr WHERE crm5.comptr.comptr_id = crm5.pv_salespress.comptr2_seller)
WHEN (SELECT crm5.pv_salespress.comptr3_Winner FROM crm5.pv_salespress) = 1 THEN (SELECT crm5.comptr.name FROM crm5.comptr WHERE crm5.comptr.comptr_id = crm5.pv_salespress.comptr3_seller)
ELSE (SELECT crm5.comptr.name FROM crm5.comptr WHERE crm5.comptr.comptr_id = 35)
END AS [Installed By],
crm5.pv_salespress.RemovalDate AS [Removal Date],
crm5.pv_salespress.RemovalReason AS Reason,
crm5.pv_salespress.ActionBy AS [Removed By],
crm5.project.project_id,
crm5.sale.sale_id
FROM crm5.contact INNER JOIN
crm5.sale INNER JOIN
crm5.project INNER JOIN
crm5.projectmember ON crm5.project.project_id = crm5.projectmember.project_id INNER JOIN
crm5.pmembtype ON crm5.projectmember.mtype_idx = crm5.pmembtype.PMembType_id INNER JOIN
crm5.projstatus ON crm5.project.status_idx = crm5.projstatus.ProjStatus_id ON crm5.sale.project_id = crm5.project.project_id ON
crm5.contact.contact_id = crm5.projectmember.contact_id RIGHT OUTER JOIN
crm5.pv_salespress ON crm5.sale.sale_id = crm5.pv_salespress.Sale_idx
----------------------
Thanks in advance
Niels
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Oct 10, 2007
Hi
I got a SQL Server with Language = €śGerman€? and Collation = €śLatin1_General_CI_AS€?.
My application has a form with language = €śEnglisch€?. This application is calling an stored procedure, that has a datetime parameter.
db.AddInParameter(dbCommand, "@Test", DbType.DateTime, Test);
This stored procedure is not able to accept the value from the parameter, because the application is passing it, in the format ymd and sql server is specting it in ydm.
I tried to set the dateformat = ymd in the store procedure, thing that did not work. I have to set it before exec my-stored procedure. But I cant from my application.
How can I solve this?
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Oct 23, 2006
Hi!fact: sp_setapprole can't be invoked from within a stored procedure
scenario: my users are validated in the database! I have a Users table that contains user related information, incl. passwords and profiles.
Actually users login through an applicational SP -- svc_login @username, @password -- and all users have the same permissions.
desired scenario:Have 1 app. role per user's role; once the user log in through the svc_login, I would like to change his appl. role based on his profile.
I already saw that i can't do this at DB side! Is there any known alternative to this kind of scenarios? Or must I rely on the front-end application and share the role password with it?Thanks in advancejmn
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Mar 8, 2007
I am trying to do this in a stored procedure and I am lacking permissions. Not sure if they will allow me permission so is there an alternative? I want to do it in a procedure and prefer not to use DTS.
BULK INSERT tablename
FROM 'C:filename.txt'
WITH
(
ROWTERMINATOR = ' '
)
ddave
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Feb 5, 2008
Hi there,
I'm fairly new to SSIS but essentially I would like to create the following:
Table Structure:
===========
Code Name
ABC Abc Industries
..... .......
XYZ Xyz Industries
Read an excel file into the database (I have this working)
Loop through the result set and concatinate the [Code] to a variable
Every 200 rows I would like to use the varible that contains 200 codes e.g. Myvar = ABC,ABC1,ABB1,ABB2...... into another task, the variable would be reset after the task has been complete for the next 200 rows
I have no idea how I can perform the kind of paging that I am after, I know the Foreach control loops through each record and I could use Scriptmain to attach to the variable but I'm not sure how to perform an additional task every 200.
Thanks in advance
Regards Rob
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Feb 19, 2008
Are there other ways to change the database ?
For instance command stringdatabasename ?
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Apr 18, 2007
Hi,
Can anyone help me with third party tools that perform the same way as SQL Servers Merge replication.
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Dec 23, 2004
I have 3 SQL databases: A, B and C. A and B are branch databases while C is the central (HQ) database. A & B will be constantly updated while C will updated occasionally and usually will be used for reporting/data browsing. Even though A & B are from different branch, they do have share some data records.
Every day, I will have to sync A & B's new/updated data to C and C to A/B. I know I can use Replication but I can't. You see, A & B are located in our own branch server while C was hosted on a third-party server. The webserver provider for C would not allow me to do any Replication on C.
What other alternatives that I can use to synchronise all 3?
DTS? XML transfer? It looks as if I have no choice but to write my own sync scripts? :((
Anyone has encountered similar situations? Any recommended SQL Tool programs?
Please help. I'm at a loss of what Im going to do.
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Apr 17, 2007
Hello,
I would like to know what alternatives are avaliable to SQL Server Merge Replication. I am also looking for Third Party Tools. Can anyone name a few for me.
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Feb 8, 2008
Hello all, I'm new to SSIS and this forum, and this is my first post.
We're migrating a 2000 DTS ETL process to 2005 SSIS. We really like the enhanced functionality of SSIS thus far.
One problem we have with our 2000 process is that runs at 1:00am each morning. The scheduling is done via a distributed scheduling tool called Maestro. Our process pulls data from a mainframe-based DB2 OLTP and reformats it into SQL Server reporting tables. We have nightly mainframe batch processing that updates the DB2 tables, and we need those updates on a nightly basis.
The mainframe batch process starts at 8:00pm each evening. It finishes normally by 1:00am 90% of the time, but it is 20+ years old, and has its share of problems, especially during month-end. The problems can't be resolved until the next business day in some cases.
We'd like to elegantly connect the two processes somehow so the SSIS ETL process kicks off when the mainframe batch process finishes. I intentionally didn't use the word 'trigger' up until this point.
It would not be a problem to modify the mainframe batch process to insert or update a DB2 table that SSIS has access to, but I don't think we can get the mainframe batch process to update SQL Server 2005 tables...?
Any advice would be greatly appreciated--TIA!
John
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Oct 30, 2007
Hello.
I have a query which spends a lot of time calculating my CASE WHEN -statements.
My query looks like this
SELECT TOP 250
UserId,
CASE WHEN
(someCol*0.4+someOtherCol*0.3) > 99 THEN 99
ELSE
(someCol*0.4+someOtherCol*0.3)
END
FROM
(
SELECT
UserId,
CASE WHEN @myparam > 50 THEN
CASE WHEN Col5+@myincrease > 99 THEN 99 ELSE Col5+@myincrease END
ELSE
CASE WHEN Col6+@myincrease > 99 THEN 99 ELSE Col6+@myincrease ENDEND as someCol,
CASE WHEN Col8+@myincrease3 > 99 THEN 99 ELSE Col8+@myincrease3 END as SomeOtherCol
FROM
SomeTable
) t1
This is just a little bit of the full query. I cannot write the whole query since it contains alot of different views and calculations, but I have traced it down to that all these case when-statements is taking a lot of time to do. So I hope that this example will be enough for you to understand my problem.
I know about some tricks that can replace a CASE WHEN, for example using COALESCE or BETWEEN but that does not seem to work in my case.
Any suggestions?
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Dec 11, 2007
I've googled everything about GUID, seems there is no good thing to say about it. Here's my scenario, a purchase order (PO) application:
We want to have a centralized database with remote sites connected to it
Some of the sites are without connection, they will have their own servers with scheduled replication to the centralized database.
The design is something like this:
Each PO will have many revisions
Each revision will have many PO line items
Each PO line item will have many Delivery Schedules
In the past i used int IDENTITY as transaction ID in revision and line item tables.
transaction ID in revision table is FK to line item table, and transaction ID line item table is FK to Delivery Schedules table.
This work well in standalone database.
Now that we need to merge replicates, int IDENTITY produced in remote DB will conflict with IDENTITY produced in central DB.
I'm thinking of using GUID to replace int IDENTITY.
Question:
How bad is my decision?
Can't GUID size indexing problem be solved with partitioning?
Can you suggest other alternatives to GUID, based on the above scenario?
Thanks in advance
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Jan 11, 2006
Hello everybody,
I'm new using ASP 2.0, I was trying to find out how do i tell a SqlDataSource the parameters it will be using for the select query. I was looking at the Configure Data Source wizard and when I press the where botton to create the parameters, I do not know how two of the available Source selections work which are: (Query String, and Session). What I want to understand is how do I pass the parameter value during the form load like I used to do with ASP 1.1.
I used to write: during the pageload event:
me.dataAdapter.selectparameter("@param").value = [myVar]
me.dataAdapter.fill(Me.ds)
I tried to do something like this for the SqlDataSource but didnt work.
can anyone tell me how can I acomplish this?
thanks a lot.
Ed.
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Apr 19, 2004
I am having some difficulty writing a relatively basic query. The objective is to retrieve the new stories (headlines) for the past 3 days from the database. Since each headline can be assigned multiple categories (topics) the query returns a row for every headline assignment. I can't use the 'Group By' expression because one of the columns is nText.
So basically if there is an article written yesterday, "I Love Cats" that gets assigned both topics 'CATS' and 'PETS' I only it returned with the first topic assigned... 'CATS'. Here is a little image of the three tables being called:
http://64.225.154.232/temp_dbDiagram.gif
I don't think that this query is too difficult, but I'm just getting my feet wet with writing queries that are more than select * from whatever. Any insight or recommendations are greatly appreciated.
SELECT headline.HEADLINE_ID, headline.HEADLINE_TITLE, headline.HEADLINE_DATE, headline.HEADLINE_THUMBNAIL,
topic.TOPIC_NAME, topic.TOPIC_URL
FROM tbl_CCF_Headlines headline INNER JOIN
tbl_CCF_Headlines_Topics ON headline.HEADLINE_ID = tbl_CCF_Headlines_Topics.HEADLINE_ID INNER JOIN
tbl_CCF_Topics topic ON tbl_CCF_Headlines_Topics.TOPIC_ID = topic.TOPIC_ID
WHERE (headline.HEADLINE_DATE IN
(SELECT TOP 3 HEADLINE_DATE
FROM tbl_CCF_HEADLINES
GROUP BY HEADLINE_DATE
ORDER BY HEADLINE_DATE DESC))
ORDER BY headline.HEADLINE_DATE DESC
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May 8, 2008
Hopefully someone can suggest a better solution than what I'm currently hobbling along with.Basically, I've got a table that has rows inserted (with a timestamp) whenever there is a change to one of the values of a particular "item". So, what I want is to return a dataset of the latest value for each category, for each particular item. I'm guessing that what I'm trying to acheive is doable in some elegant and performant fashion. Something maybe involving a ROLLUP or WITH CUBE or something amazingly obvious. But for the time being, I've got a less-elegant query that returns the correct data. It just uses subqueries.Here's the T-SQL to run my scenario: DECLARE @actionHistoryTable TABLE ( itemID int, actionType int, actionValue nvarchar(50) NULL, actionTime datetime )INSERT @actionHistoryTable VALUES( 1000, 1, 'fork', '1/1/2008')INSERT @actionHistoryTable VALUES( 1000, 2, '27', '1/2/2008')INSERT @actionHistoryTable VALUES( 1000, 3, '200', '1/12/2008')INSERT @actionHistoryTable VALUES( 1000, 2, '1', '1/1/2008')INSERT @actionHistoryTable VALUES( 1000, 3, '204', '1/1/2008')INSERT @actionHistoryTable VALUES( 1000, 1, 'ball', '1/3/2008')INSERT @actionHistoryTable VALUES( 1026, 2, '20', '1/10/2008')INSERT @actionHistoryTable VALUES( 1026, 2, NULL, '1/5/2008')INSERT @actionHistoryTable VALUES( 1026, 1, 'hotdog', '1/6/2008')INSERT @actionHistoryTable VALUES( 1026, 3, '2511', '1/8/2008')INSERT @actionHistoryTable VALUES( 1026, 3, '375', '1/7/2008')INSERT @actionHistoryTable VALUES( 1026, 1, 'mustard', '1/5/2008')INSERT @actionHistoryTable VALUES( 1013, 1, 'rock', '1/2/2008')INSERT @actionHistoryTable VALUES( 1013, 1, 'paper', '1/21/2008')INSERT @actionHistoryTable VALUES( 1013, 3, '10', '1/20/2008') -- JUST DISPLAY THE RAW TABLE FOR THIS EXAMPLESELECT * FROM @actionHistoryTable -- THIS RETURNS THE RESULTS I'M WANTING, IT ROLLS-UP THE LATEST VALUE FOR EACH ACTION_TYPE FOR EACH ITEMIDSELECT aht.itemID ,( SELECT TOP 1 aht2.actionValue FROM @actionHistoryTable aht2 WHERE aht.itemID = aht2.itemID AND aht2.actionType = '1' ORDER BY aht2.actionTime DESC ) as 'latest type 1 value' ,( SELECT TOP 1 aht2.actionValue FROM @actionHistoryTable aht2 WHERE aht.itemID = aht2.itemID AND aht2.actionType = '2' ORDER BY aht2.actionTime DESC ) as 'latest type 2 value' ,( SELECT TOP 1 aht2.actionValue FROM @actionHistoryTable aht2 WHERE aht.itemID = aht2.itemID AND aht2.actionType = '3' ORDER BY aht2.actionTime DESC ) as 'latest type 3 value'FROM @actionHistoryTable ahtGROUP BY aht.itemID Is there a better way?-Steve
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Jul 16, 2006
Hello,
Can anyone direct me a good article that is about why we should try avoiding using cursors and what are the alternatives?
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Feb 16, 2008
can we call cursors from asp.net as we can call stored procedures from asp.net.
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Jan 7, 2005
Hi,
I'm writting a stored procedure to insert new rows into a table, but I need to loop through an exsiting table and create a new record for every row in the old table. So I think what I'm needing to use is a cursor, but I've never worked with cursors before, and I just want to check that I have the right idea on what they are used for and if what I have so far looks ok.
This what I have so far, the StoreFees table only has 5 rows:
DECLARE @StoreFee as smallmoney
DECLARE @StoreLineID as int
DECLARE MyStoreFees CURSOR
FORWARD_ONLY
FOR
SELECT LineId, StoreFee FROM StoreFees ORDER BY StoreFee
OPEN MyStoreFees
FETCH NEXT FROM MyStoreFees
INTO @StoreLineId, @StoreFee
--Do my Inserts into other tables
INSERT INTO OtherTable (...,...,.., @StoreFee)
...
...
-- Done working with that row
CLOSE MyStoreFees
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Feb 28, 2005
I am trying to pull the data via fetching rows into a variable.
Begin
Fetch Next Into @temp...
Select @MainVariable = @MainVariable + @temp < @temp doesn't refresh with next fetch)
Print @temp < this works fine and returns the value for each fetch
End
I can print @temp and the data returns fine, but when I try to cancantenate with the above select, it doesn't refresh @temp wit the column in the table.
Any ideas?
DotNetNow
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Jun 19, 2001
I have two procedures. One works well, and the other has a small glitch I cannot figure out. I have placed >>>> at the place where the problem is occuring.
The first procedure, which is working great, is applying a stored procedure to many servers (remote procedure call), but is also polling the local server via a linked server connection. This way, all servers are polled equally.
The second procedure is actually using a SELECT statment to query a system table. This procedure works well on all servers except the local one. I get this error message:
Server: Msg 3910, Level 16, State 1, Line 1
Transaction context in use by another session.
[OLE/DB provider returned message: Unspecified error]
There seems to be a connection issue. Can someone help me work around this?
Thank you,
Neal
FIRST PROCEDURE (this one works perfectly):
truncate table dbidname
CREATE TABLE ##dbtemp ( dbname VarChar(50),
dbsize varchar (25),
dbownervarchar(50),
dbid smallint,
createdate datetime,
statusvarchar(75) )
declare@servernamevarchar(50)
declare dbupdate cursor
global
for
select servername from sqlservers where status = 'a'
open dbupdate
fetch next from dbupdate into @servername
while @@fetch_status = 0
begin
print @servername
EXEC sp_addlinkedserver @servername, 'SQL Server'
>>>INSERT INTO ##dbtemp
>>>exec (@servername + '.master..sp_helpdb')
alter table dbidname alter column sqlservers_id int null
insert into dbidname (dbsystemid, dbname)
select dbid, dbname from ##dbtemp
update dbidname set sqlservers_id = sqlservers.sqlservers_id from sqlservers where @servername = sqlservers.servername and
dbidname.sqlservers_id is null
update dbidname set whenupdate = getdate()
alter table dbidname alter column sqlservers_id int not null
exec sp_dropserver @servername
delete ##dbtemp
fetch next from dbupdate into @servername
end
close dbupdate
deallocate dbupdate
drop table ##dbtemp
exec spal_db_files_update
SECOND PROCEDURE (see >>>> to note problem area):
truncate table dbidname
CREATE TABLE ##dbtemp ( dbname VarChar(50),
dbsize varchar (25),
dbownervarchar(50),
dbid smallint,
createdate datetime,
statusvarchar(75) )
declare@servernamevarchar(50)
declare dbupdate cursor
global
for
select servername from sqlservers where status = 'a'
open dbupdate
fetch next from dbupdate into @servername
while @@fetch_status = 0
begin
print @servername
EXEC sp_addlinkedserver @servername, 'SQL Server'
>>>>INSERT INTO ##dbtemp
>>>>exec (@servername + '.master..sp_helpdb')
alter table dbidname alter column sqlservers_id int null
insert into dbidname (dbsystemid, dbname)
select dbid, dbname from ##dbtemp
update dbidname set sqlservers_id = sqlservers.sqlservers_id from sqlservers where @servername = sqlservers.servername and
dbidname.sqlservers_id is null
update dbidname set whenupdate = getdate()
alter table dbidname alter column sqlservers_id int not null
exec sp_dropserver @servername
delete ##dbtemp
fetch next from dbupdate into @servername
end
close dbupdate
deallocate dbupdate
drop table ##dbtemp
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Nov 28, 2000
I am receiving this error when running my cursor:
Error Messages...
Server: Msg 16933, Level 16, State 1, Line 0
The cursor does not include the table being modified.
The statement has been terminated.
Server: Msg 16933, Level 16, State 1, Line 5 (this message repeats)...
The cursor does not include the table being modified.
The statement has been terminated.
query:
declare cursor_test CURSOR for
select emp_ssn, effective_date1 from temp_employee_benefit_load
open cursor_test
declare @ssn char(9), @process_date char(8)
fetch next from cursor_test into @ssn, @process_date
while (@@fetch_status=0)
update test_cursor
set ssn = @ssn, process_date = @process_date
where current of cursor_test
fetch next from cursor_test into @ssn, @process_date
close cursor_test
deallocate cursor_test
Any help is appreciated:
Thanks,
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Sep 7, 2000
I have stored procedure in that I am using a cursor to fetch the row by row.
cursor is fetching 75000 records so that the procedure is taking long time.
Is there any way to replace the cursor to fetch the records row by row.
He needed.
Ranch
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Apr 14, 2000
Please help resolve a problem (and debate!).
We have an app using VB with Access as the front end to SQL. SQL statments were built and sent
directly to the server obtaining set-oriented results. Response was fair.
We have a new app developed by an "expert" using VB & Interdev that was to be ported for use on
the internet. The app was designed using the same logic to build the SQL statements, but it is also
using cursors to retrieve all data. RESPONSE IS TERRIBLE!
The designer says that to access SQL over the Web, cursor use is a MUST!
True? Not True?
If true, and I am stuck with an app using cursors, any basic suggestions on where to look to improve
response time?
Thanks for any input.
FJ
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Apr 23, 1999
Hi,
I am using SQL Server 6.5 and I have a VB routine that updates a field in a tble so it can be used in a primary key. This is run after input of data using bcp. I have noticed on several posts re: using cursors to move through a recordset and was wondering if I could use this functionality to replace my VB routine. I checked the archives and found several messages but I am not sure where to start. My VB routine is:
I first would query the data to return all rows where the value of R08SegmentValue= Null. Then I move through the resultset changing the value of the field R08Segments.
***********************Start of VB Code****************
'Set initial value for sTReportHeaderIdx
With rs1
sTReportHeaderIdx = !ReportIdx & !HeaderIdx
sPReportHeaderIdx = sTReportHeaderIdx
End With
bCount = 1
'loop through rs and when streportheaderidx changes reset bCount to 1
'otherwise increment bcount by 1 and write to field R08SegmentValue
Do While rs1.EOF = False And blnContinue = True
DoEvents
Do While sPReportHeaderIdx = sTReportHeaderIdx
With rs1
.Edit
!R08SegmentValue = bCount
.Update
bCount = bCount + 1
sPReportHeaderIdx = sTReportHeaderIdx
.MoveNext
If Not rs1.EOF Then sTReportHeaderIdx = !ReportIdx & !HeaderIdx
End With
Loop
sPReportHeaderIdx = sTReportHeaderIdx
bCount = 1
Loop
In the end my data should look like
ReportIdx HeaderIdx R08SegmentValue
1 1 1
1 1 2
2 1 1
2 1 2
2 1 3
3 1 1
3 1 2
3 1 3
1 2 1
1 2 2
1 2 3
etc..
Can this be done via an sp? How would I go about writing something like this?
Thanks in advance...any assistance you could provide would be appreciated!
Kevin
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Aug 6, 2002
I hope someone can help me with this, as BOL didn't get me the answer I am looking for.
I want to write an update step that will transform the following:
1 abc
1 def
2 lmn
3 rst
4 tuv
4 xyz
4 jkl
5 pqr
into this:
1 abc,def
2 lmn
3 rst
4 tuv,xyz,jkl
5 pqr
In other words, I want to concatenate multiple instances into 1 record per row, but I am not familiar with working with cursors or loops.
Thanks in advance!
bv
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Nov 16, 1998
According go textbooks and T-SQL developers experience - using cursors is not recommended, more over they say: avoid cursors where it's possible.
Could someone please recommend any other way to go through the recordset(resultset) forward and backward to perform some search or calculations, if there are a specific requirement for not using front-end tools such as VB or MS Access(please don't ask why), other words - all the work must be performed in T-SQL stored procedure.
Thanks
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Feb 24, 2008
Hi
I defined a cursor and executed it...but now i exactly forgot what select statement i had run in the cursor..(forgot the columns that i am extracting )
how do I view the contents of the cursor ?
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Aug 25, 2004
I have a stored proc that merges records from an undeduped table to a deduped table. It is running really slowly. Merging 70 million records against a deduped 70 million is taking 115 hours and counting on decent hardware. Very slow.
I suspect there is significant room for optimization here. Some of my ideas:
- Write/update back to the cursor rather than executing separate UPDATE statements.
- Try a dynamic cursor instead of a READ ONLY cursor.
- Dump new elements to a separate table or a file and then do a single large INSERT.
Anyone else think any of these ideas will work? Can anyone think of something better?
BTW, I've tried to replaced the procedural cursor code with set based UPDATES/INSERTS but the short version of the story is that that route just didn't pan out. I know that is very common optimization advice.
I've made minor simplifications to the code:
- Took out code to handle last line
- Took out progress logging code
- Removed some DECLARE statements. These are needed to run but it should be obvious what they were supposed to be.
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Aug 27, 2004
Trying to understand cursors a little better, found this in one of the dbs I inherited. Just trying ot figure out why they put it there cause no one else knows anything about it.
DECLARE [TM #] CURSOR
FOR SELECT * FROM [2004 TERMS];
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Jan 14, 2005
nevermind forget I asked thanks anyways
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