Performance Gains Using Multiple (.ndf's)??

Jan 3, 2001

I have a legacy prod db of 102Gb which contains 101Gb of free space. The db
comprises 2 Primary (.mdf's) on one drive and over 200 (.ndf's) residing on one logical drive, (4 physical drives with RAID 5). ie. Each user table object has its own (.ndf). Some of these tables have been allocated up to 15Gb.

Limited documentation suggests that performance benefits can be achieved by
allocating a maximum size to certain key tables rather than setting the table
properties to autogrow.

No mention is made of grouping these files into filegroups to potentially achieve the same performance gains.

Transportability of this db is now a problem since no other test/dev/prod boxes contain enough free space.

I propose to re-create the db and have the user data tables reside within the (.mdf) - possibly even group highly active tables within filegroups.

Are there any benchmark tests or KB articles to indicate/support the original
strategy of using multiple (.ndf's) over data tables within one (.mdf)??

Thanks, in advance.

John

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Performance Gains When INSERTing Multiple Rows

Aug 11, 2006

I apologize since this seems to be a fundamental question, but I did try to search and there seems to be something wrong - after clicking on the "search" button, the page just will not update... I even tried "advanced search" but no luck there, either.

Anyway, my question is about writing multiple data rows to tables in a SQL Server database. Currently I'm using embedded SQL from a VC++ 2005 .Net program to write data to a SQL 2005 Express server (either on the same PC or on another, via TCP). As data becomes available, I issue INSERT statements, one by one. One row is about a dozen columns, typically 8 bytes each, for each of the few tables in the database. In most cases, I have several rows of data available at the same time. Those rows come at the rate of around 200-1000 per second for the different tables. With that setup, my SQL server is not able to keep up - the data ends up getting buffered in the program, waiting for the server, the server process uses just about all the CPU cycles it can get, etc.

I'm reading the "SQL in a nutshell" book from O'Reilly but it's mostly language oriented, it doesn't say much about performance improvements. It would seem natural that one could improve the performance. For example, when I do a SELECT query, the data comes very quickly, which makes me think that it is the overhead of making those individual calls with small amount of data. I would think that I should be able to request that multiple rows are written at the same time with a single SQL statement, and that this would improve the performance. However, I have no idea how to do that.

I did try one thing - enlisting the sequence of INSERTs into a single transaction, thinking it will all get buffered and only get written to the server after the Commit command is issued. I did that but it doesn't seem to help. What should I try to alleviate this problem? One thing to consider: although I use SQL Server for testing, I am trying to keep compatibility with other databases, e.g., ODBC to any available data source, including MS Access over Jet. I would love it if the solution to this were compatible (i.e., not involve any Transact SQL or other vendor-specific tricks).
I thank you in advance for your assistance!

Kamen

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May 2, 2007

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Jun 18, 2008

hi,

I came across the following topic which speaks about inserting multiple rows into a table.

http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=52980

The following is the code it concludes:
----------------------------------------------------------
INSERT INTO InstitutionManagement.dbo.b10_partC
(unitid, repyear, test, subject_area, scores,
credit_awarded, comments, recno)
select
unitid = 'data1a',
repyear = 'data1b',
test = 'data1c',
subject_area = 'data1d',
scores = 'data1e',
credit_awarded = 'data1f',
comments = 'data1g',
recno = 'data1h'
union all
select
unitid = 'data2a',
repyear = 'data2b',
test = 'data2c',
subject_area = 'data2d',
scores = 'data2e',
credit_awarded = 'data2f',
comments = 'data2g',
recno = 'data2h'
union all
select
unitid = 'data3a',
repyear = 'data3b',
test = 'data3c',
subject_area = 'data3d',
scores = 'data3e',
credit_awarded = 'data3f',
comments = 'data3g',
recno = 'data3h'
... And so on...
----------------------------------------------------------

My question is based on the performance of the above insert statement aganist Microsoft.Net SqlBulkCopy Class.

One more thing: Does the above statement gets executed as asingle statement or as multiple statements (One execution for each Select statement).

thanks

regards,
vinay

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Hello,
 
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Should I for better performance get rid of DB3 and add the tables there to DB1 and DB2 ? (Thus multiplying data, but, if the performance will be much better, it will be fine with me)
 
I would be thankful for any advices.

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Instance A Instance B Instance C
(active) (active) (active)
| /
| /
| /
SAN for Database and Quorum

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I know a failover cluster can be done, where 1 instance is active and others are passive (active/passive) which improves reliability, but in this configuration just 1 instance is serving at the same time.

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Jun 22, 2006

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I have SP which accept 3 parameters ID, Key, Date

NOTE: Key is the coulm name from the Excel. So my sp call look like

sp_insert ID, Key1, date
sp_insert ID, Key2,date
sp_insert ID, Key3,date

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and
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and
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and
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I am Not sure of the query but am trying to get the list of cars that are to be filtered based on the user input.

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Mar 3, 2008



Please can anyone help me for the following?

I want to merge multiple rows (eg. 3rows) into a single row with multip columns.

for eg:
data

Date Shift Reading
01-MAR-08 1 879.880
01-MAR-08 2 854.858
01-MAR-08 3 833.836
02-MAR-08 1 809.810
02-MAR-08 2 785.784
02-MAR-08 3 761.760

i want output for the above as:

Date Shift1 Shift2 Shift3
01-MAR-08 879.880 854.858 833.836
02-MAR-08 809.810 785.784 761.760
Please help me.

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Thanks.



I might not have made my problem quite clear enough. My table has one column labeled value. The value in that table is linked through an ID field to another table where the ID's are broken down to one ID =Number of Hours, One ID = Grade and One ID= type of work.

What I'm trying to do is when using these ID's and seperate the value related to those ID's into 3 seperate columns in a query for using in Reporting Services to create the report

As you can see, I'm attempting to change the name of the same column 3 times to reflect the correct information and then link them all to the person, where one person might have several entries in the other fields.

As you can see I can change the names individually in queries and pull the information seperately, it's when roll them altogether is where I'm running into my problem

Thanks for the suggestions that were made, I apoligize for not making the problem clearer.

Here is a copy of what I'm attempting to accomplish. I didn't have it with me last night when posting.



--Pulls the Service Opportunity

SELECT cs.value AS "Service Opportunity"

FROM Cstudent cs

INNER JOIN cattribute ca ON ca.attributeid = cs.attributeid

WHERE ca.name = 'Service Opportunity'



--Pulls the Number of Hours

SELECT cs.value AS 'Number of Hours'

FROM Cstudent cs

INNER JOIN cattribute ca ON ca.attributeid =cs.attributeid

WHERE ca.name ='Num of Hours'



--Pulls the Person Grade Level

SELECT cs.value AS 'Grade'

FROM Cstudent cs

INNER JOIN cattribute ca ON ca.attributeid =cs.attributeid

WHERE ca.name ='Grade'



--Pulls the Person Number, First and Last Name and Grade Level

SELECT s.personnumber, s.lastname, s.firstname, cs.value as "Grade"

FROM student s

INNER JOIN cperson cs ON cs.personid = s.personid

INNER JOIN cattribute ca ON ca.attributeid = cs.attributeid

WHERE cs.value =(SELECT cs.value AS 'Grade'

WHERE ca.attributeid = cs.attributeid AND ca.name='Grade')

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 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
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 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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_ _ _ _ _ _ _ _
Column0 | Value0
 _ _ _ _ _ _ _ _
Column1 | Value1
 _ _ _ _ _ _ _ _
Column2 | Value2
 _ _ _ _ _ _ _ _
Column3 | Value3
 _ _ _ _ _ _ _ _
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 _ _ _ _ _ _ _ _

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Hi all!

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I simplified my example to this:
-----------------------------
--CREATE PROCEDURE sp_InsertOrders AS

DECLARE @docHandle INT, @xmlDoc VARCHAR(4000), @orderID INT

--DROP TABLE #Orders
CREATE TABLE #Orders
(
OrderId SMALLINT IDENTITY(1,1),
FkCustomerID SMALLINT NOT NULL,
OrderDate DATETIME NOT NULL
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--DROP TABLE #OrderDetails
CREATE TABLE #OrderDetails
(
OrderDetailsId SMALLINT IDENTITY(1,1),
FkOrderID SMALLINT NOT NULL,
ProductID SMALLINT NOT NULL,
UnitPrice SMALLINT NOT NULL
)

Set @xmlDoc = '
<Orders>
<Order CustomerID="1" OrderDate="2004-04-01">
<OrderDetails ProductID="6" UnitPrice="19"/>
<OrderDetails ProductID="3" UnitPrice="11"/>
<OrderDetails ProductID="9" UnitPrice="7"/>
</Order>
<Order CustomerID="2" OrderDate="2004-04-12">
<OrderDetails ProductID="2" UnitPrice="24"/>
<OrderDetails ProductID="4" UnitPrice="13"/>
</Order>
</Orders>'

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SELECT CustomerID, OrderDate
FROM OpenXML(@docHandle, 'Orders/Order', 3)
WITH (
CustomerID INTEGER,
OrderDate DATETIME
)

SET @OrderID = @@IDENTITY;

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SELECT @OrderID AS OrderID, ProductID, UnitPrice
FROM OpenXML(@docHandle, 'Orders/Order/OrderDetails', 3)
WITH (
ProductID INTEGER,
UnitPrice INTEGER
)
-----------------------------

All orders are inserted first which makes the use of @@IDENTITY incorrect (it works fine if you insert a single order with multiple order details). Since it was quite some time since I last worked with SQL I am not sure if am doing it the right way... :confused: :confused: Anybody out there who knows how to solve the problem?

Cheers,
Christian

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table1.month=d.month and
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Here is the SQL statement that I've written to make sure it is the correct one (on the msdn library page it said that this was the ODBC connection):

SELECT a.*
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Using the query:
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T_BankTransfer.amount AS Bnk_Amount, T_cash.TotalAmount AS Cas_Amount, T_RentPayment.AmountPayed AS Ren_Paid,
T_AdminPayment.AmountPaid AS Adm_Paid, T_InternetBilling.Total AS Int_Paid, T_Utilities.AmountPaid AS Util_Amount,
T_InvoicePayment.amountPaid AS Inv_Paid, T_OtherPayments.paymentAmount AS Oth_Paid, T_parkingBill.paymentAmount AS Prk_Paid,
T_TelephoneBills.TelephoneCredit AS Tel_Paid, T_DepositPayment.[Deposit payment] AS Dep_Amount, T_Receipt.cancelled AS Canceled,
T_Receipt.RemittanceReceiptNo AS Rec_Ref, T_Receipt.Student
FROM T_Receipt INNER JOIN
T_DepositPayment ON T_Receipt.ReceiptNo = T_DepositPayment.receiptNo LEFT OUTER JOIN
T_RentPayment ON T_Receipt.ReceiptNo = T_RentPayment.RentPaymentNo LEFT OUTER JOIN
StandingOrder ON T_Receipt.ReceiptNo = StandingOrder.ReceiptNo LEFT OUTER JOIN
T_TelephoneBills ON T_Receipt.ReceiptNo = T_TelephoneBills.ReceiptNo LEFT OUTER JOIN
T_parkingBill ON T_Receipt.ReceiptNo = T_parkingBill.ReceiptNo LEFT OUTER JOIN
T_OtherPayments ON T_Receipt.ReceiptNo = T_OtherPayments.ReceiptNo LEFT OUTER JOIN
T_InvoicePayment ON T_Receipt.ReceiptNo = T_InvoicePayment.receiptNo LEFT OUTER JOIN
T_cash ON T_Receipt.ReceiptNo = T_cash.ReceiptNo LEFT OUTER JOIN
T_AdminPayment ON T_Receipt.ReceiptNo = T_AdminPayment.ReceiptNo LEFT OUTER JOIN
T_BankTransfer ON T_Receipt.ReceiptNo = T_BankTransfer.receiptNo LEFT OUTER JOIN
T_Utilities ON T_Receipt.ReceiptNo = T_Utilities.receiptNo LEFT OUTER JOIN
T_credit ON T_Receipt.ReceiptNo = T_credit.ReceiptNo LEFT OUTER JOIN
T_cheque ON T_Receipt.ReceiptNo = T_cheque.ReceiptNo LEFT OUTER JOIN
T_InternetBilling ON T_Receipt.ReceiptNo = T_InternetBilling.ReceiptNo
GROUP BY T_Receipt.Student, T_Receipt.ReceiptNo, T_cheque.Amount, T_credit.Amount, StandingOrder.Amount, T_BankTransfer.amount, T_cash.TotalAmount,
T_AdminPayment.AmountPaid, T_InternetBilling.Total, T_Utilities.AmountPaid, T_InvoicePayment.amountPaid, T_OtherPayments.paymentAmount,
T_parkingBill.paymentAmount, T_TelephoneBills.TelephoneCredit, T_Receipt.cancelled, T_Receipt.RemittanceReceiptNo,
T_DepositPayment.[Deposit payment], T_RentPayment.AmountPayed, T_Receipt.Student
HAVING (T_Receipt.Student LIKE N'06%')

Which gives a result of:




RecNo.
30429
Cheque
250
Deposit
250


30429
679.98
250


This is fine but when I do analysis on this it appears as though the student has paid two deposit payments. I was wondering with out querying each table independently from an application if there was a criteria to specify that I only get one deposit result.
So as such say, give me all the payments but I only want one result from the other tables. I though about discrete but that wouldn't work here.

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Hello All,

I am rather new to reporting on SQL Server 2005 so please be patient with me.

I need to create a report that will generate system information for a server, the issue im having is that the table I am having to gather the information from seems to only allow me to pull off data from only one row.

For example,. Each row contains a different system part (I.e. RAM) this would be represented by an identifier (1), but I to list each system part as a column in a report

The table (System Info) looks like:-

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1 | RAM
2 | Disk Drive
10| CPU
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Which


So basically I need it to look like this.

Name | IP | RAM | Disk Drive|
----------------------------------------------
A | 127.0.0.1 | 512MB | Floppy

So Far my SQL code looks like this for 1 item
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How would I go about displaying the other system parts as columns with info

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Hi!

I have 7 source databases and one target database, all using the same structure. The structure is made of 10 tables, with foreign key constraints.

I need to merge the source databases into the target (which won't have any data before that process, but will already have the correct schema), and to keep the relationships between the records.

I know how to iterate over the source databases (with SMO foreach), but I'd like to know if someone can advise the best copy method for that context in SSIS ? (I don't want to keep the primary keys, but I need to keep the relationships...)

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best regards and thanks

Thibaut

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I have a couple of hundred flat files to import into database tables using SSIS.

The files can be divided into groups by the format they use. I understand that I could import each group of files that have a common format at the same time using a Foreach Loop Container.

However, the example for the Foreach Loop Container has multiple files all being imported into the same database table. In my case, each file needs to be imported into a different database table.

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I suppose I could make a different Data Flow Destination item for each file, in the Data Flow. Would that be a reasonable solution, or is there a simpler solution, or should I just resign myself to making a separate Data Flow for every single file?

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