Lookup Transform Issuing One Select Statement Per Input Row
Oct 20, 2007
I am using the lookup transform with the following settings:
Reference table: Use results of an SQL query. The query retrieves the surrogate key and four business key columns from a dimension table which contains a few thousand rows.
Columns: business keys in the incoming data are mapped to the business keys in the reference table, and the surrogate key is looked up from the reference table.
Advanced: Enable memory restriction is OFF (and the other items on the Advanced tab are greyed out).
I assumed that this means that the lookup transform would cache all of the rows in the SQL query, and then perform the lookups against this cache. This is the behaviour that I saw when I was running the package in my local environment in the BIDS debugger.
However, a colleague was doing some profiling on our production database server, and noticed that the lookup transform is instead issuing a single SQL query for each row of input. Our production ETL server has many GBs of free RAM available (way more than enough to cache the contents of the lookup table in memory), and given that memory restriction is disabled, I don't understand why the lookup transform is behaving in this fashion. Does anyone have an explanation for this? I'm probably misunderstanding a key concept here.
Below is a simple Select statement performing a Lookup into a SQL database and returning the columns (associated with the Row) in to Cells on an eForm. The issue I have is there are 42 rows (which go up and down) and do not feel like writing 42 select statements.
select RiskDescriptor, RiskImpactLowDescriptor, RiskImpactMediumDescriptor, RiskImpactHighDescriptor from [Risk Descriptors] where [RiskDescriptor ID] in (1) order by [RiskDescriptor ID]; <<1@Cell104>> <<2@Cell105>> <<3@Cell106>> <<4@Cell107>>
I would like to add a loop, adding 1 to the RiskDescriptor ID and 4 to the Cells. So on second pass in the loop: RiskDescriptor ID = 2 <<1@Cell108>> <<2@Cell109>> <<3@Cell110>> <<4@Cell111>>
Third pass in the loop: RiskDescriptor ID = 3 <<1@Cell112>> <<2@Cell113>> <<3@Cell114>> <<4@Cell115>> and so on.
The Until portion of the loop can be hardcode (42 in this example) but would rather use an EOL or Query the DB for the total number of RiskDescriptor ID. This way when the DB changes (ID's go up or down) the SQL Statement does not need to be notified.
It is a JDBC call from within the eForm.
I would appreciate any help on how to format a loop in a SQL Statement
I know this is an easy one and I know I've read it somewhere, but I can't seem to write the correct format to run correctly. I am trying to build a SELECT statement base on the selected values of a dropdown list on a webform. The selected values will be part of the Table name.. ("client_info" & location_option.selecteditem.value) Can someone show me the correct syntax for adding a form variable into a SELECT statement? Thanks
Is it possible to have an entire sql select statement as the input variable to a stored procedure? I want the stored procedure to execute the select statement.
ie.
exec sp_SomeFunc 'select * from table1 where id=1'
It may sound weird, but I have my reason for wanting to do it this way. Is this possible? if so, how do I implement this inside the stored procedure?
I have a very simple problem I am trying to solve.
I have a table with a "DateEntered" field, and I have an ssis pkg set up to load data from a file into the database table. I just want to make sure that no one loads the same file twice in one day.
For example, if today is 8/22/07, and "DateEntered" is "2007-08-22", then I want to add a Lookup transform to run a query that will check and see if there's any rows in the table with a "DateEntered" is "2007-08-22". If so, don't load the file again!
Here's my query:
SELECT Code FROM myTable WHERE DATEADD(dd, DATEDIFF(dd, 0, DateEntered), 0) = DATEADD(dd, DATEDIFF(dd, 0, GETDATE()), 0)
(all the dateadd stuff is doing is removing the time portion from the DateEntered field, so we are comparing apples to apples).
Now, if the query returns a bunch of "Codes" then we know that the data has already been entered for the day! So far, so good.
Now, how do I set up the Lookup to get it to work? I'm getting this error message: Error 1 Validation error. Data Flow Task: Lookup [1299]: The lookup transform must contain at least one input column joined to a reference column, and none were specified. You must specify at least one join column. FXRateLoader.dtsx 0 0
But I thought I did this! On the columns tab, I have: Lookup column: code Lookup operation: Replace 'code' Output alias: code
I have my error output set to: Lookup output - redirect row
Hi! I am a newbie, grateful for some help. I have a Source Ole DB w sql-command selecting the customer.salary and customer.occupation, which I want to match with demo_id in Ole DB destination. salary, occupation also in dim_demographic. But in Lookup editor I find no column demo_id... how do I do this?
I have a ETL that have a Lookup transform to get a rate from a table SpotRates.
The problem is when the match od some date in SpotRates Table doens't exist...
And for that records I need to lookup for next date...
For example...
SpotRate Table
Date Currency Rate
05-04-2006 0:00 DOLAR ESTADOS UNIDOS 1,2262
06-04-2006 0:00 DOLAR ESTADOS UNIDOS 1,2312
07-04-2006 0:00 DOLAR ESTADOS UNIDOS 1,2179
10-04-2006 0:00 DOLAR ESTADOS UNIDOS 1,2099
11-04-2006 0:00 DOLAR ESTADOS UNIDOS 1,2105
12-04-2006 0:00 DOLAR ESTADOS UNIDOS 1,2125
13-04-2006 0:00 DOLAR ESTADOS UNIDOS 1,2094
18-04-2006 0:00 DOLAR ESTADOS UNIDOS 1,2252
19-04-2006 0:00 DOLAR ESTADOS UNIDOS 1,2346
20-04-2006 0:00 DOLAR ESTADOS UNIDOS 1,2346
21-04-2006 0:00 DOLAR ESTADOS UNIDOS 1,2315
24-04-2006 0:00 DOLAR ESTADOS UNIDOS 1,2365
25-04-2006 0:00 DOLAR ESTADOS UNIDOS 1,2425
When I first try to lookup the date 17-04-2006, doesnt give me any records... and I need to create a new lookup for the next date from 17-04-2006. And in this example the next date is 18-04-2006.. How can I do it??
I made a sql query date gives me the next date with 2 parameters ... but I'm having some errors...
SELECT TOP 1 Data FROM Spot_Rates WHERE (Currencies_Name = ?) AND (Data > CONVERT(DATETIME, ?, 102)) ORDER BY Data DESC
In this exampple, the parameters returned from lookup1 is:
Currencies_name= 'DOLAR ESTADOS UNIDOS'
DATE='17-04-2006'
I need to create a second lookup transform to return the next date/currency for each row that didnt match in the first lookup...
I want to do something relatively simple with SSIS but can't find an easy way to do this (isint it always the case with SSIS )
I have a column lets say called iorg_id, and I want to lookup the matching rows for this col in a table. In this table iorg_id may have several potential matching rows. In this table there is another col called 'Amount'. I want to retrieve for each iorg_id the matching iorg_id in the other table but only the row with the largest value in the 'Amount' col.
I couldn't find a way to do this all in the Lookup Transform. I can match the iorg_ids and retrieve the Amount column, but can't find a way just to retrieve the matching row with the largest value in the Amount col. The only way I can think to do this is then run the output from the Transform through an Aggregate function and determine the Max (although haven't tested this yet).
Seems strange to me in that the SQL in the Advanced tab gives me something like: select * from (select * from [dbo].[Table1]) as refTable where [refTable].[iorg_id] = ?
where I believe the first 'select *' is retrieving all the cols that are listed in the LookupColumns list in the Columns tab. I thought I would be able to amend this to something like: select max(amount) from (select * from [dbo].[Table1]) as refTable where [refTable].[iorg_id] = ?
but I get a metadata type error.
So, questions are: Is it possible to do this all in the Lookup Transform are do I have to use the Aggregate function as I think ? Why is it not possible to amend the sql in the Advanced tab to manipulate the returned data ?
I am trying to digest this logic, and have been unsuccessful so far. I am designing a package for incremental loads, but the destination table has a composite primary key on 2 columns, one of which is nullable. The source data comes from a SPROC. Uptill now, I have been banging my head trying to get this logic to work via the Lookup transform with a conditional split, but it doesn't work. Am I on the right track, or should I be using the SCD Wizard?
As a side note, I have been trying to work a solution using Andrew's blogpost on doing incremental loads: http://sqlblog.com/blogs/andy_leonard/archive/2007/07/09/ssis-design-pattern-incremental-loads.aspx
Please indulge my ignorance, as I have only been using SSIS for a couple of weeks. I'm trying to create a data warehouse using two input tables. A column needs to be added to one table by using a lookup into the second table. SSIS seems to handle the "no matches" and "single match" cases perfectly. I can't for the life of me figure out how to properly handle multiple matches. SSIS defaults to the first match, but I need to compute the "best" match.
Is it possible to use a VARIABLE in the Lookup Transform? I am setting the cache mode to partial and have modified the caching SQL statement on the advanced tab to include the parameterized query, but the parameter button only allows me to select columns to map to the parameter. I need to use a variable instead. I see the ParameterMap property of the transform in the advanced editor, but don't see how I can use this to map to a variable.
Can this be done, or do I need to use a new source, sort and left join component to accomplish the same thing?
i'm creating a Lookup programmatically. But i can't find out how to assign the ConnectionManager that references the lookup data. Do you have an example for me?
i configure the lookup transform in the data flow task "Input column has a data type that cannot be matched".
This is the query that i use to set the reference table dataset
select firstname, lastname, address, email from customers_dimension cd , cust_test ct where cd.address<>ct.address.
I basically want to try and find all those records that have the same firstname, lastname, email in the customer dimension table where the records do not match. Both the input fields and the lookup fields have the same data type [varchar(max)].
It is pretty confusing, so much so that i did the lookup against the exact same table and got the same error.
Does anyone have a better idea as to what the problem is?
Thankyou
P.S.-This is the caching statement in the advanced tab select * from
(SELECT firstName FROM Customers_Dimension) as refTable where [refTable].[firstName] = ?
I'm trying to lookup a value in another table linking on a column of datatype DT_R8. The lookup transform is complaining that I can't link on that datatype. However, the documentation says that it should work. I'm using the April CTP. Is this fixed in a later version? Any suggestions?
I am having problems with a lookup transformation. I have a row in my lookup table for blank ('') source data. If I test the join using SQL the match is made, but the Lookup transform doesn't consider it a match and sends it to error output. Is there a property that I don't have set correctly or something else I am forgetting?
Im working through the MS example of "removeDuplicates". I cant seem to figure out how to add custom property for input column.
I added the helper method: private static void AddIsKeyCustomPropertyToInput(IDTSInput90 input, object value) { IDTSCustomProperty90 isKey = input.CustomPropertyCollection.New(); isKey.Name = "IsKey"; isKey.Value = value; } I call it from: public override void ProvideComponentProperties() { //... AddIsKeyCustomPropertyToInput(input, false); //... } public override void ReinitializeMetaData() { IDTSInput90 input = ComponentMetaData.InputCollection[0]; if (input.CustomPropertyCollection.Count == 0) { AddIsKeyCustomPropertyToInput(input, false); } // ... }
However when I deployed it and added the component to SSIS package - I cant see the Custom Column "IsKey" in the input column properties window. What am I missing - please help
Has anyone find solution for this problem. i also checked http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=298056&SiteID=1 and http://blogs.conchango.com/kristianwedberg/archive/2006/02/22/2955.aspx
Suppose have a Dimension table
DimColor ---------------------------- ColorKeyPK(smallint) ColorAlternateKey(nvarchar(30)) -1 UnknownMember 1 2 Blue 3 Red 4 Black
Color with the ID 1 is empty string
FactOrders --------------------------- OrderID Date Color Quantity
OrderID = 1 Color = 'Black' Quantity = 10 OrderID = 2 Color = 'Red' Quantity = 20 OrderID = 3 Color = '' Quantity = 10 OrderID = 4 Color = 'Blue' Quantity = 5 OrderID = 5 Color = Black Quantity = 10
When i use the Lookup transform it cannot find the ColorKeyPK
The result of the Lookup transform is. ------------------------------ OrderID = 1 Color='Black' ColorKey=4 OrderID = 2 Color='Black' ColorKey=3 OrderID = 3 Color='Black' ColorKey=NULL ----> This is the problem Lookup cannot find empty string. It should be 1. OrderID = 4 Color='Black' ColorKey=2 OrderID = 5 Color='Black' ColorKey=4
I've a simple lookup transform in SSIS 2008 (R2). I've created it with a full cache and it worked fine. When i switch to partial cache, it will give me this error:
-------------------------------------------------------------------------------------------------- TITLE: Package Validation Error ------------------------------ Package Validation Error ------------------------------ ADDITIONAL INFORMATION: Error at DFT_AdventureWorks [Lookup [411]]: SSIS Error Code DTS_E_OLEDBERROR. An OLE DB error has occurred. Error code: 0x80004005.
[Code] ....
I've created a OLE source with the following query :
SELECT SalesOrderID, OrderDate, CustomerID FROM Sales.SalesOrderHeader
And this will flow into the lookup transform and this has the following lookup reference query:
SELECT CustomerID, AccountNumber FROM Sales.Customer WHERE CustomerID % 7 <>0
I have a package that works fine in development. I move the package over to test and it fails validation in the lookup transform.
Error 46 Validation error. Data Flow Task - PO Lines Interface: Lookup - LIST PRICE [29621]: output column "LIST_PRICE_PER_UNIT" (29667) and reference column named "LIST_PRICE_PER_UNIT" have incompatible data types. SPO_TO_ORACLE_PO.dtsx 0 0
What strikes me as odd is the fact that I don't have a way of specifying the data types. I just specify the column I wish to return as a new column with the same name. Anyway, why would this work in one instance but not another?
I have a requirement to access a lookup table from within an SSIS Transform Script Component
The aim is to eliminate error characters from within the firstname, lastname, address etc. fields by doing a lookup of an ASCII code reference table and making an InStr() type comparison.
I cannot find a way of opening the reference data set from withing the transform.
I work in the healthcare area, and am handling the survey data ETL's. There are around 8 different survey areas and based on information received from them for the visit they reference, I want to pull in more info from our invoicing database. My idea is this:
1.) Pull in the flat file to an ODBC staging table 2.) Cache all invoice records that fall between the MIN(Date of Service) and MAX(Date of Service) from the staging table. 3.) First lookup the information needed on patientID, providerID, date of service, and billing location. 4.) For the surveys that didn't match on those 4 columns, try looking up based on patientID, date of service, and billing location (since I could be 99% sure this would still return the record I need). 5.) For the remaining surveys, lookup based just on patientID and date of service. These records will be flagged for manual review because clearly, if a patient has multiple appointments in the same day, this will be prone to error.
However, in trying to use only 3 of the columns in the lookup, I get the error saying basically that I need to utilize all 4. Is there a way around this, or is there an entirely different way I should be approaching this? The reason I thought cache transform was the answer is because I will need to run a different package for each lookup, as the data and logic between each survey will vary, but the invoice data "pool" will stay the same regardless.Â
I would like to know what happens when a very large reference data set for a lookup transform with full caching enabled is getting loaded during package execution and the computer memory runs out or is very low. Does SSIS a) give an out of memory error of some sort b) resort to a no caching or partial caching mode c) maintain the full caching mode but will switch to using the paging file(virtual memory).
I think it will resort to using the page file in which case the benefits of in memory lookups are lost and performance would suffer. If I cannot upgrade the memory or shrink the reference set somehow, i should switch that lookup task to use partial caching or no caching with an indexed lookup table. Would this make sense?
I need to validate my input rows. The row is valid if there exist some other input rows in the same table (I am importing data from excel and access). I'll give an example to make everything clear:
Input table boys has following columns:First_Name ,Surname and Date_of_birth.
Output table is Twin_Triple_More_Brothers. I would like to insert into this table only boys that surnames are equal and difference in date of birth is less then one day.
I was thinking about lookup component, but I cannot use it in that way (or I just do not know how).
Maybe someone has an idea how to do this? Thanks for help.
We are using lookup transformation in SSIS 2012. The lookup transformation queries a table with two date columns. When we hover the mouse over the two columns in the 'columns' tab of the lookup transformation editor, the two columns show as DT_WSTR instead of DT_DBDATE. This causes the SSIS package to fail due to data type mismatch.A similar abandoned thread is available at: URL....
I am trying to interpret some of the results I observe when trying to match similar records using a fuzzy lookup transform, but it's not entirely clear how the overall row similarity score is calculated. In particular, sometimes rows with lower individual column similarity scores will achieve a higher similarity and confidence score than a matching row with higher individual column scores.
The transform is configured with 6 text fields set to fuzzy mapping and a minimum similarity of 0, and 3 additional numeric fields with an exact mapping. It is set to return a maximum of 2 matches per lookup and to do an exhaustive search of the reference table.
For example, from the following matching pair of records Match 1 is picked over Match 2 even though it's individual scores are lower.
I issued the following statement on my database as my log file showed 100% full. However after running this command and also running it again after expanding the size to almost double the value of both my database log and data devices it still shows the log as being 100% full.
DUMP TRANSACTION <database> WITH TRUNCATE_ONLY (and also used the NO_LOG option).
So can anyone tell me whats going wrong here? I should note that I am still able to enter data into the database without any errors.
Hi, Following error appears in the SQL Server error log when I execute BACKUP Log db with truncate_only using a stored procedure. The stored proc I am using is as follows:
CREATE procedure spm_tranlog as
declare @DBName as Varchar(120)
select @DBName = DB_name() dump transaction @DBName with truncate_only GO
There are data import processes running in the night, before starting the processes we are executing spm_tranlog procedure to clear the transaction logs. The following error appears in log after executing the spm_tranlog:
€œBACKUP failed to complete the command exec spm_tranlog€?
This always happens after weekly server maintenance tasks. The scheduled maintenance tasks I am running are: Index rebuild, truncate log and shrinking database. There were no other processes running during that time when the spm_tranlog prodecure fail.
The Database size is 40GB, Log size is 80MB. The database is in the simple recovery model.The database is in the simple recovery model. I am running SQL Server 2000 (SP4) on windows server 2003.
I recieve an error when I use the Lookup component in SSIS that reads:
Statement(s) could not be prepared.
I'm using a SQL 2005 DB as the source which runs into a lookup table and is use to compare records with an SQL 2000 Database. I've created connection managers successfully to both these databases. When trying to use the results of an SQL Query for the lookup to the SQL 2000 database (which is a linked server) and I try to map the columns, the error pops up and exits out of the lookup properties Window
The details to the error read:
Program Location: at Microsoft.SqlServer.Dts.Tasks.ExecuteSQLTask.Connections.SQLTaskConnectionOleDbClass.PrepareSQLStatement(String sql, Boolean bypassPrepare) at Microsoft.DataTransformationServices.Design.DtsConnectionCommonControl.CheckSqlQuery()
I'm looking to use the results of this comparison to output in some form of a report. Ideas would be greatly appreciated!
I want to do an update query like the following:UPDATE tblUserDetails SET DeploymentNameID = 102 WHERE (EmployeeNumber = @selectedusersparam)Is there some simple way to add the @selectedusersparam as value1,value2,value3 etc. or do I have to input it with this type of syntax:UPDATE dbo_tblUserDetails SET dbo_tblUserDetails.DeploymentNameID = 102WHERE (((dbo_tblUserDetails.EmployeeNumber)=value1 Or (dbo_tblUserDetails.EmployeeNumber)=value2));Help appreciated.Many thanks.
