Joining Large Fact Table To A View That Returns 120 Rows
Jan 19, 2015
I have a simple query that joins a largeish fact table (3 million rows) to a view that returns 120 rows. The SKEY in the view is returned via a scalar function. The view returns instantly if queried on it's own however when joined to the fact table in the simple query below results in a query execution plan that runs forever. Interestingly if I change the INNER JOIN to a LEFT OUTER JOIN the query returns the matched results almost instantly.
Select
Dimension.Age_Band.[10_Year_Age_Band],
Count(*)
From
Fact.APC_Episodes
Inner Join Dimension.Age_Band ON
Fact.APC_Episodes.AGE_BAND_SKEY = Age_Band.AGE_BAND_SKEY
Group By
Dimension.Age_Band.[10_Year_Age_Band]
I know joining to a view using a column generated by a scalar function is not a good recipe for performance. I also know that I could fix this by populating a physical table with the view first as I have already tested this though I hoping not to have to go down that route.
Why a LEFT OUTER JOIN works and not an INNER JOIN or anyway I can get the query optimizer to generate an execution plan that works?
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Oct 26, 2015
Say you have a fact table with a few columns that all reference the same key column in a dimension table, you want to write a view to return the information for those keys?
USE MyTestDB;
GO
SET NOCOUNT ON;
IF OBJECT_ID ('dbo.FactTemp' ,'U') IS NOT NULL
DROP TABLE dbo.FactTemp;
[Code] ....
I'm using very small data at the moment, and the query plan and statistics don't really say which way.
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Apr 29, 2008
I have query that takes 12 minutes to execute. The query uses around 9 tables but I have narrowed down the problem to one table that has over 65 million rows. The problem table has only 3 fields
FieldOne (PrimaryKey)
FieldTwo Varchar(3000)
FieldThree Varchar(3000)
The query uses the primary key of this table to perform the join. FieldTwo and FieldThree are only used as output parameters.
I noticed if I remove FieldTwo and FieldThree from the output (but still leave the table in the query), the query executes in 1 second. However if I include FieldTwo and FieldThree in the output, the query takes over 12 minutes to execute.
I cannot index FieldTwo and FieldThree because of the field size and I cannot reduce the size of the fields because of the data that needs to be stored in it? How can I index or do something similar to speed up the table look up.
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Apr 29, 2015
I have  a large fact table about 500 million rows, and I am using 2008 r2, thus I am having the file system error, I have browsed online and tried all the fix , but I am still having the error . I tried taking only about year data (which was still around 200 million records) and  I was still having the error.
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Apr 5, 2006
I am having the following situation - there is a view that aggregates and computes some values and a table that I need the details from so I join them filtering on the primary key of the table. The execution plan shows that the view is executed without any filtering so it returns 140 000 rows which are later filtered by the join operation a hash table match. This hash table match takes 47% of the query cost. I tried selecting the same view but directly giving a where clause without the join €“ it gave a completely different execution plan. Using the second method is in at least 4 folds faster and is going only through Index Seeks and nested loops.
So I tried modifying the query with third version. It gave almost the same execution plan as the version 1 with the join operation.
It seams that by giving the where clause directly the execution plan chosen by the query optimizer is completely different €“ it filters the view and the results from it and returns it at the same time, in contrast to the first version where the view is executed and return and later filtered. Is it possible to change the query some how so that it filters the view before been joined to the table.
Any suggestions will be appreciated greatly
Stoil Pankov
"vHCItemLimitUsed" - this is the view
"tHCContractInsured" - this is the table
"ixHCContractInsuredID" - is the primary key of the table
Here is a simple representation of the effect:
Version 1:
select *
from dbo.vHCItemLimitUsed
inner join tHCContractInsured on
vHCItemLimitUsed.ixHCContractInsuredID = tHCContractInsured.ixHCContractInsuredID
where tHCContractInsured.ixHCContractInsuredID in (9012,9013,9014,9015)
Version 2:
select *
from vHCItemLimitUsed
where ixHCContractInsuredID in (9012,9013,9014,9015)
Version 3:
select *
from dbo.vHCItemLimitUsed
where ixHCContractInsuredID in
(select ixHCContractInsuredID
from tHCContractInsured
where ixHCContractInsuredID in (9012,9013,9014,9015))
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Nov 14, 2007
I have three table and I have to fetch some data from each one. This can be done by calling three diffrent stored procedures for each one.But it can be done with view and joining these three tables and only one time calling this view and getting the same result.(These joins can be from diffrent database too)
Which one is better View and joining these three tables and call this view one time or calling three stored procedures in for example .net side.
Sincerely
Kianoosh
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Dec 4, 2007
I wonder if you can help...
I have a simple setup: 2 tables and a joining table, and want to retrieve a data set showing every possible combination of table A and table B together with whether that combination actually exists in the joining table or not.
My tables:
channels
======
channel_id
channel_name
items
====
item_id
item_name
channels_items (joining table)
===========
channel_id
item_id
created
An example of the dataset I want (assuming 2 items and 2 channels, with itemA not being in channelB):
item_id item_name channel_id channel_name exists
======= ========= ========== ============ ======
1 ItemA 1 ChannelA True
2 ItemB 1 ChannelA True
1 ItemA 2 ChannelB False
2 ItemB 2 ChannelB True
I'm completely stuck on how to achieve this. Any guidance would be very much appreciated.
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Feb 24, 2007
I have the following query:
select sq.*, p.numero, p.nombre
from paf p right outer join dbo.GetListOfSquaresForShippingLot(@lot) sq on sq.number = p.numero and sq.version = p.numero
The @lot parameter is declared at the top ( declare @lot int; set @lot = 1; ). GetListOfSquaresForShippingLot is a CLR TVF coded in C#. The TVF queries a XML field in the database and returns nodes as rows, and this is completed with information from a table.
If I run a query with the TVF only, it returns data; but if I try to join the TVF with a table, it returns empty, even when I'm expecting matches. I thought the problem was the data from the TVF was been streamed and that's why it could not be joined with the data from the table.
I tried to solve that problem by creating a T-SQL multiline TVF that is supposed to generate a temporary table. This didn't fix the problem.
What can I do? Does anybody know if I can force the TVF to render its data somewhere so the JOIN works? I was thinking a rowset function could help, but I just can't figure out how.
PLEASE HELP!!!!
Let me know if you want the code for the CLR TVF. This is the code for the T-SQL TVF:
CREATE FUNCTION [dbo].[GetTabListOfSquaresForShippingLot]
(
@ShippingLot int
)
RETURNS
@result TABLE
(
Number int, Version int, Position smallint,
SubModel smallint, Quantity smallint,
SquareId nvarchar(5),
ParentSquareId nvarchar(5),
IsSash smallint,
IsGlazingBead smallint,
Width float,
Height float,
GlassNumber smallint,
GlassWidth float,
GlassHeight float
)
AS
BEGIN
INSERT INTO @result
SELECT *
FROM dbo.GetListOfSquaresForShippingLot(@ShippingLot)
RETURN
END
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Jul 22, 2007
Hello All.
I am struggling with the below join block in my stored procedure.
I can't seem to get the duplicate row problem to go away. It seems that SQL is treating each new instance of an email address as reason to create a new row despite the UNIONs.
I understand that if I am using UNION, using DISTINCT is redundant and will not solve the duplicate row problem.
Primary Keys: none of the email address columns are primary keys. Each table has an incrementing ID column that serves
as the primary key.
I am guessing I am encountering this problem because of how
I have structured my Join statements? Is it possible to offer advice without a deeper understanding of my data model or
do you need more information?
Thanks for any tips.
Code:
select emailAddress from Users union
select user_name from PersonalPhotos union
select email_address from EditProfile union
select email_address from SavedSearches union
select distinct email_address from UserPrecedence union
select email_address from LastLogin) drv
Left Join Users tab1 on (drv.emailAddress = tab1.emailAddress)
Inner Join UserPrecedence tab5 on tab5.UserID=tab1.UserID
Left Join PersonalPhotos tab2 on (drv.emailAddress = tab2.user_name)
Left Join LastLogin tab4 on (drv.emailAddress = tab4.email_address)
Left Join EditProfile tab3 on (drv.emailAddress = tab3.email_address)
Left Join SavedSearches tab6 on (drv.emailAddress = tab6.email_address
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Aug 27, 2007
Hi everyone,
I use sql 2005. What is the best practice for dealing with large table (more than million rows)? Table Partition, View or other?
Can you please give some suggestions? It will be very helpful if you can post some references or examples.
Thank you!
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Jul 28, 2007
Hi,
Our database has very large number of objects. We have a naming convension by modules, subprojects etc. But for example when we need to open a specific table it still takes time to find it. If we could create custom folders under table folder or stored procedure folder it will be easier to find an object. We could create sub folders by module, subproject and classify our objects with these folders. Will the next version SQL Server 2008 support this kind of functionality?
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Jul 24, 2012
Write a CREATE VIEW statement that defines a view named Invoice Basic that returns three columns: VendorName, InvoiceNumber, and InvoiceTotal. Then, write a SELECT statement that returns all of the columns in the view, sorted by VendorName, where the first letter of the vendor name is N, O, or P.
This is what I have so far,
CREATE VIEW InvoiceBasic AS
SELECT VendorName, InvoiceNumber, InvoiceTotal
From Vendors JOIN Invoices
ON Vendors.VendorID = Invoices.VendorID
[code]...
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Dec 24, 2007
Hey Guys
i need to add a datetime column to an exisitng table that has like 1.2 million records and its being accessed frequently
but i cant afford to stop the db at all
whenever i do : alter table mytable add Updated_date datetime
it just takes too long and i have to stop executing the query after a couple of mins
I am running sql express 2005 sp2. db size is over 3 gb but still under the 4 gb limit
can u plz advice on how to add this column. its urgent!!
thanks in advance
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Aug 30, 2007
I have a row that is being used log track plays on our website.
Here's the table:
CREATE TABLE [dbo].[Music_BandTrackPlays](
[ListenDate] [datetime] NOT NULL DEFAULT (getdate()),
[TrackId] [int] NOT NULL,
[IPAddress] [varchar](20)
) ON [PRIMARY]
There's a CLUSTERED INDEX on ListenDate ASC and a NON CLUSTERED INDEX on the TrackId.
I have a TRIGGER on the Music_BandTrackPlays table that looks like the following:
CREATE TRIGGER [trig_Increment_Music_BandTrackPlays_PlayCount]
ON [dbo].[Music_BandTrackPlays] AFTER INSERT
AS
UPDATE
Music_BandTracks
SET
Music_BandTracks.PlayCount = Music_BandTracks.PlayCount + TP.PlayCount
FROM
(SELECT TrackId, COUNT(*) AS PlayCount
FROM inserted
GROUP BY TrackId) AS TP
WHERE
Music_BandTracks.TrackId = TP.TrackId
When a simple INSERT statement is done on the Music_BandTrackPlays table, it can take quite a long time. When I remove the TRIGGER the INSERTs are immediate. The Execution plan for the TRIGGER shows that a 'Inserted Scan' is taking up most of the resources.
How exactly is the pseudo 'inserted' table formed?
For now, I think the easiest thing to do is update my logging page so it performs 2 queries. One to UPDATE the Music_BandTracks table and increment the counter, and perform the INSERT into the Music_BandTrackPlays table seperately.
I'm ok with that solution but I would really like to understand why the TRIGGER is taking so long. The 'inserted' pseudo table will be 1 row 99% of the time. Does SQL Server perform a table scan on all 20 million rows in order to determine what's new and put it in the inserted pseudo table?
Thanks!
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May 12, 2015
I am using SQL SERVER 2008R2, not Denali, so I cannot use OFFSET FETCH Clause.
In my stored procedure, I am doing a SELECT INTO #tblTemp FROM... Working fine. This resultset is going to be used in an SSIS package which will generate a pipe-delimited .txt file... Working fine.
For recoverability sake, I am trying to throttle back on the commit chunks to 1000 rows per commit until there are no more rows. I am trying to avoid large rollbacks.
Q: Am I supposed to handle the transactions (begin/commit/rollback/end trans) when the records are being inserted into the temp table? Or when they are being selected form the temp table?
Q: Or can I handle this in my SSIS package for a flat file destination? I don't see option for a flat file destination like I do for an OLE DB Destination (like Rows per batch, Maximum insert commit size).
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Apr 24, 2013
IF NOT EXISTS (SELECT TOP 1 1 FROM dbo.syscolumns WHERE id = OBJECT_ID(N'dbo.Employee) and name = 'DoNotCall')
BEGIN
ALTER TABLE [dbo].[Employee] ADD [DoNotCall] bit not null Constraint DoNot_Call_Default DEFAULT 0
IF ( @@ERROR <> 0 )
GOTO QuitWithRollback
END
It just takes a LOT of time in SQL Server Management studio. I have to cancel the query and cancelling takes a whole lot time. I am using SQL Server 2008.
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Mar 11, 2008
Hi, my name's John and this is my first post here at SQL team. I've learnt a lot from the forums here, never needed to post though. I'm pretty good at sql, but not that good and I think for the first time in couple of years I now have a query that I'm completely unable to create.
Let me explain the setup.
I've got three tables e.g.
Products (productid, Name)
100 Computer
200 Printer
300 PDA
ProductActions (ID, Name)
6 changed casing
8 Changed motherboard
7 replaced cd-drive
ProductPerformedActions (productid, actionid)
100,7
100,9
200,8
This basically shows a simple setup showing that product (computer) has been done the action "repaired" and product (printer) has been done the action "changed motherboard". The query i'd like to have is where I can select all products that have not been performed on cerrtain actions. e.g. a list of products that have not been performed on all actions, such as
UnPerformedActionsList(product,actionid)
PDA,6
PDA,7
PDA,8
Printer,7
Printer,6
Computer,8
I know its foundation is something like this:
select productid from products where productid not in
(select productid from productperformedactions....
which elimiantes products that have been performed an action on, but it also removes it for ALL actions,
which i'm trying to avoid. All i want is kind of a cross join, listing all actions, then inverting it, to show
all products that have NOT had it performed on them.
I hope this makes sense.
Thanks
John
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Jul 30, 2000
Help, is something wrong with my SL Server? I am unable to return any rows from all tables in all databases (user and system)on My SQL 7.0 SP2 machine. Whne i right click on the table in E.M and select design or open table i get no results. Does anyone know why this is happening? It did not always happen either.
Thanks
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May 24, 2007
I've been searching the forums and Google for some help splitting up rows in a table without any luck. I'm not quite sure what to even look for
I have a table is MSSQL 2000 that looks as follows:
Code:
id custnum b1_email b2_email b1_sub b2_sub
------------------------------------------------------------------------
1 123456 b1@host1.com b2@host1.com 0 0
2 654321 b1@host2.com b2@host2.com 1 0
3 321654 b1@host3.com b2@host3.com 0 1
Now... I am hoping create a view that splits these rows up so that only a single email address is on each row. I'd like to split it up as follows:
Code:
custnum email sub
----------------------------------
123456 b1@host1.com 0
123456 b2@host1.com 0
654321 b1@host2.com 1
654321 b2@host2.com 0
321654 b1@host3.com 0
321654 b2@host3.com 1
Any help would be great! I imagine some sort of join command can be constructed using a single table?
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Oct 4, 2015
I am studying indexes and keys. I have a table that has a fixed width of data to be loaded in the first column which is parsed in a view based on data types within the fixed width specifications.
Example column A:
(name phone house cost of house,zipcodecountystatecountry)
-a view will later split this large varchar string basedÂ
column b: is the source filename of the data load (varchar 256)
....
a. would there be a benefit of adding a clustered or nonclustered index (if so which/point in direction on why)
b. is there benefit of making one of these two columns a primary key (millions of records) or for adding a 3rd new column as a pk?
c. view: this parses the data in column a so it ends up looking more like "name phone house cost of house zipcode county state country" each having their own column.
-any pros/cons of adding indexes (if so which) to the view instead of the tables or both for once the data is parsed?
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Dec 5, 2005
I have three tables
1st table is Student
StudnetID (pk)
Other fields…
2nd table is PhoneType
PhoneTypeID (pk)
PhoneType
3rd table is StudentHasPhone
SHPID (pk)
StudnetID (fk)
PhoneTypeID (fk)
PhoneNumber
PhoneType is an auxiliary table that has 5 records in it Home phone, Cell phone, Work phone, Pager, and Fax. Is there a way to do a join or maybe make a view of a view that would allow me to ultimately end up with…
StudnetID: 1
Name: John
HomePhone: 123-456-7890
WorkPhone: 123-456-7890
CellPhone:
Pager: 123-456-7890
Fax:
Memo: This is one student record.
Some students will have no phone number, some will have all 5 most will have one or two. If possible I would like to do a setup like this in my database to keep from having to have null fields for 4 phone numbers that the majority of records won’t have.
Thanks in advanced,
Nathan Rover
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Jan 11, 1999
Wuddup,
I am trying to create a view that encapsulates some specific info from many different tables. I have about 30 tables all with exactly the same field names and field types. I want to take 3 of the fields from every table and put them together into one 'VIEW' so I can run more efficient queries. SQL however, doesn't let you 'combine' 2 columns from different tables into one column in the view. (making sense?)
I tried running a 'UNION' but you are specifically NOT allowed to run a union in a create view statement. Anyone have any ideas?
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May 8, 2007
Hi all,
Maybe someone here can help me out: I have a Kimball type II dimension, where i track changes in a hierarchy. Each row has a RowStartDate and RowEndDate property to indicate from when to when a certain row should be used.
Now i want to load facts to that table. So each fact will have a certain date associated with it that i can use to lookup the right Id (a certain SourceId can have mulitiple integer Ids when there are historic changes) and then load the facts.
Is there a building block I can use for that? I could do this with SQL scripts but the client would prefer to have as much as possible done in SSIS. The Lookup transformation will only let me specify an equal (inner join where A=B) join, but i need equal for one column (SourceId) and then >= and <= (RowStart and RowEnd) to find the right row version.
Any ideas? Thanks in advance,
John
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Jul 13, 2007
I am trying to get data from an Oracle view using an OLE DB data source and a "SQL Command". When I "preview" the data it looks fine, but when I execute the package I get the following error:
Error: 0xC0202009 at Data Flow Task, CEDAR View [1]: SSIS Error Code DTS_E_OLEDBERROR. An OLE DB error has occurred. Error code: 0x80004005.
An OLE DB record is available. Source: "OraOLEDB" Hresult: 0x80004005 Description: "ORA-01403: no data found".
Error: 0xC0047038 at Data Flow Task, DTS.Pipeline: SSIS Error Code DTS_E_PRIMEOUTPUTFAILED. The PrimeOutput method on component "CEDAR View" (1) returned error code 0xC0202009. The component returned a failure code when the pipeline engine called PrimeOutput(). The meaning of the failure code is defined by the component, but the error is fatal and the pipeline stopped executing. There may be error messages posted before this with more information about the failure.
Error: 0xC0047021 at Data Flow Task, DTS.Pipeline: SSIS Error Code DTS_E_THREADFAILED. Thread "SourceThread0" has exited with error code 0xC0047038. There may be error messages posted before this with more information on why the thread has exited.
Error: 0xC0047039 at Data Flow Task, DTS.Pipeline: SSIS Error Code DTS_E_THREADCANCELLED. Thread "WorkThread0" received a shutdown signal and is terminating. The user requested a shutdown, or an error in another thread is causing the pipeline to shutdown. There may be error messages posted before this with more information on why the thread was cancelled.
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Jul 19, 2006
My thread titles need work, I know. :o
Ok, lets say I've got:
tblDocuments
id INT PK
documentName VARCHAR
tblUsers
id INT PK
userName VARCHAR
tblDocumentApprovals
userID INT
documentID INT
approvalDate DATETIME
If I want to get a list of documents, and the users who've signed them off (if any), I'd do something like:
SELECT [tblDocuments].[documentName], [tblUsers].[userName ], [tblDocumentApprovals].[approvalDate ]
FROM [tblDocuments]
LEFT JOIN [tblDocumentApprovals] ON [tblDocumentApprovals].[documentID] = [tblDocuments.id]
INNER JOIN [tblUsers] ON [tblUsers].[id] = [tblDocumentApprovals].[userID]
...which is lovely. Except - I don't want a row returned for each user that's signed it off. I want one row for each document, with a field containing a list of the people who've signed it off.
I know that it's bad design. I was reading an article only yesterday on how they're putting this kind of thing into the latest version of Access, and how it's a bit of a kludge. But it'd really, really help me.
How do you do it?
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Jan 3, 2008
After changing the Service account for a SQL Server 2005 SP2 machine the DMV sys.dm_os_performance_counters
is returning zero rows. These values were availiable prior to change
The change in Service account was done via the Configuration manager and the Service account is also part of the Local Administrator group
Since this change the Performance Counters in Perfmon for SQLSEVERatabases and others are also not availiable
Any suggestions on where to start looking ?
Nadreck
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May 7, 2007
Good day,
I just like to ask if anybody has experienced getting empty rows from SQL data adapter? I'm using SQL Server 2005. Problem is when the sql is run on Query Analyzer it retrieves a number of rows but when used in my application it returns 0 or empty rows.
I thought the connection is not the problem since I got my columns right. Below is my code snippet.
Thanks!
const string COMMAND_TEXT = @"select distinct somefield as matchcode, count(somefield) "
+ "as recordcount from filteredaccount where StateCode = 0 group by somefield having count(somefield) > 1";
SqlDataAdapter adapter = new SqlDataAdapter(COMMAND_TEXT, connection);
DataTable dt = new DataTable(sometablename);
adapter.Fill(dt);
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Jun 12, 2007
Hi everyone:
I guess this should be a simple question but have not been able to find the answer, does anyone know how to make a SQL Sentence to return at least one row when counting?
SELECT COUNT(Id_Field), Field2 FROM Table1 WHERE Code_Field = 1 GROUP BY Field2
This will return 0 rows when the where criteria is not matched by any record on the Table1, but I would like to have one row counting 0 rows, in stead it returns no rows at all.
Thanks for any help.
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Nov 1, 2005
Hi all,
I am trying to build a association table (t2) to store a list of users
have viewed an item in my records table (t1). My goal is to send the
UserID parameter to the query and return to the user a read / not read
marker from the query so I can handle the read ones differently in my
.net code. The problem is that I cannot work out how to return anything
but the read data to the client. So far my stored proc looks like this
DECLARE @UserID AS Int -- FOR TESTING
SET @UserID = 219 -- FOR TESTING
SELECT t1.strTitle, t1.MemoID, Count(t2.UserID) AS ReadCount,t2.UserID
FROM t1
LEFT OUTER JOIN
t2 ON t1.MemoID = t2.MemoID
WHERE t2.UserID = @UserID
GROUP BY t1.MemoID, t1.strTitle,t2.UserID
It works fine but only returns those records from t1 that are read. I
need to return the records with null values also! I may have built the
assoc table wrong and would really appreciate some pointers on what I
am doing wrong. (assoc table has rID, MemoID and UserID columns)
Please help!
Many thanks
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Aug 15, 2003
Hi,
I have DB monitoring jobs which use Sysperfinfo to monitor some of the counters. On One SQL 2K Server since few days the select on sysperfinfo returns 0.
Do you think I need to start any service from the OS side to enable this?
Your input is highly apppreciated.
Thanks,:confused:
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Oct 23, 2007
Hi,
I'm having a little trouble with the following code:
SELECT DISTINCT cd1.*, cd2.*
FROM Table1 cd1 LEFT JOIN Table2 cd2
ON cd1.RegNr=cd2.RegNr
WHERE cd1.RegNr = $RegNr
I want it to return the 2 rows that is present in the tables but it returns 4.
1262007-10-20 10:14:00
1262007-10-20 10:14:00
1262007-10-20 10:17:00
1262007-10-20 10:17:00
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Feb 7, 2007
I have a complex view in my sql 2005 database.
The view returns a column that could be null (as the result of a left outer join).
The coulmn that is returned is an integer.
Everything works fine if I run the view from SQL 2005 Management Studio.
My column value is always null if I use ADO.NET's SqlAdapter to return a DataTable.
Has anybody seen this behaviour before?
Any help appreciated.
Regards,
Paul.
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Apr 24, 2008
I have a Select Distinct myfield that returns multiple rows with same value for myfield when it should only one. Why is this happening?
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