Database

5-Mar-07 4:27

I have a program (VB.net) that inserts a large amount of records (10,000 records +) into a MySQL database. It takes forever to import these records.

Anyone got some ideas on how to speed this insert up?

kubben5-Mar-07 5:04

5-Mar-07 5:04

If your current code opens the connection
then does a single insert
Then closes the connection
and then repeats this process 10,000 times.

I would suggest that you open the connection once
do the 10,000 inserts
finally close the connection.
That would be a lot faster.

Next I am not sure if MySQL support stored procedures (I usually use MS Sql Server) If it does a prepared stored procedure will execute faster then in line sql insert.

Next if you have lots of indexes and foreign keys etc. Consider dropping these do all the inserts then add the keys etc after the inserts are done. Of course, this is more work and would probably have to be done off hours, but lots of keys etc can cause the inserts to take longer.

Anyway, a few ideas, hope it helps.
Ben

jds12075-Mar-07 5:28

5-Mar-07 5:28

Here is my current code and could you modify this to reflect the open connection and close connection like you said?

Dim myConnString As String = My.Settings.ConnectionString
Dim MyConnection As New Odbc.OdbcConnection(myConnString)
MyConnection.Open()

Dim MyCommand As New Odbc.OdbcCommand("INSERT INTO ls_orderitems (OrderDate, OrderCustomer, OrderAcctNum, OrderType, OrderSoNum, OrderItemPartNum, OrderItemPartDesc, OrderItemQty, OrderItemQtyRec, OrderItemQtyDtRec, OrderItemBO, OrderItemBODt,OrderItemCanceled, OrderItemCanceledDt, OrderItemNotes, OrderItemPONum, OrderItemRetailPrice, OrderItemSalePrice, Status, InsertDate) VALUES('" & OrderDate & "','" & OrderCustomer & "','" & OrderAcctNum & "','" & OrderType & "','" & OrderSoNum & "','" & OrderItemPartNum & "','" & OrderItemPartDesc & "','" & OrderItemQty & "','" & OrderItemQtyRec & "','" & OrderItemQtyDtRec & "','" & OrderItemBO & "','" & OrderItemBODt & "','" & OrderItemCanceled & "','" & OrderItemCanceledDt & "','" & OrderItemNotes & "','" & OrderItemPONum & "','" & OrderItemRetailPrice & "','" & OrderItemSalePrice & "','" & Status & "','" & InsertDate & "')")

MyCommand.Connection = MyConnection
MyCommand.ExecuteNonQuery()
MyConnection.Close()

kubben5-Mar-07 5:32

5-Mar-07 5:32

I am guessing that you have a loop outside of the code you posted, so I would do something like this:

Dim myConnString As String = My.Settings.ConnectionString
Dim MyConnection As New Odbc.OdbcConnection(myConnString)
Try
MyConnection.Open()

'your loop code here

Dim MyCommand As New Odbc.OdbcCommand("INSERT INTO ls_orderitems (OrderDate, OrderCustomer, OrderAcctNum, OrderType, OrderSoNum, OrderItemPartNum, OrderItemPartDesc, OrderItemQty, OrderItemQtyRec, OrderItemQtyDtRec, OrderItemBO, OrderItemBODt,OrderItemCanceled, OrderItemCanceledDt, OrderItemNotes, OrderItemPONum, OrderItemRetailPrice, OrderItemSalePrice, Status, InsertDate) VALUES('" & OrderDate & "','" & OrderCustomer & "','" & OrderAcctNum & "','" & OrderType & "','" & OrderSoNum & "','" & OrderItemPartNum & "','" & OrderItemPartDesc & "','" & OrderItemQty & "','" & OrderItemQtyRec & "','" & OrderItemQtyDtRec & "','" & OrderItemBO & "','" & OrderItemBODt & "','" & OrderItemCanceled & "','" & OrderItemCanceledDt & "','" & OrderItemNotes & "','" & OrderItemPONum & "','" & OrderItemRetailPrice & "','" & OrderItemSalePrice & "','" & Status & "','" & InsertDate & "')")

MyCommand.Connection = MyConnection
MyCommand.ExecuteNonQuery()

'bottom of your loop code

Finally
MyConnection.Close()
End Try

That way you only open the connection once then do all your inserts, finally close the connection.

Hope that helps.
Ben

jds12075-Mar-07 5:57

5-Mar-07 5:57

But what if I have the loop code and the insert statement in two different functions?

kubben5-Mar-07 6:06

5-Mar-07 6:06

Pass in the connection object into the function that does the insert.
So you have:
outter function
Dim myConnString As String = My.Settings.ConnectionString
Dim MyConnection As New Odbc.OdbcConnection(myConnString)
Try
MyConnection.Open()

'loop goes here

'Call inner function pass in MyConnection

'bottom of loop

Finally
MyConnection.Close()
End Try

You innner function looks like:
Private Sub InnerFunc(p_MyConnection As Odbc.OdbcConnection)

Dim MyCommand As New Odbc.OdbcCommand("INSERT INTO ls_orderitems (OrderDate, OrderCustomer, OrderAcctNum, OrderType, OrderSoNum, OrderItemPartNum, OrderItemPartDesc, OrderItemQty, OrderItemQtyRec, OrderItemQtyDtRec, OrderItemBO, OrderItemBODt,OrderItemCanceled, OrderItemCanceledDt, OrderItemNotes, OrderItemPONum, OrderItemRetailPrice, OrderItemSalePrice, Status, InsertDate) VALUES('" & OrderDate & "','" & OrderCustomer & "','" & OrderAcctNum & "','" & OrderType & "','" & OrderSoNum & "','" & OrderItemPartNum & "','" & OrderItemPartDesc & "','" & OrderItemQty & "','" & OrderItemQtyRec & "','" & OrderItemQtyDtRec & "','" & OrderItemBO & "','" & OrderItemBODt & "','" & OrderItemCanceled & "','" & OrderItemCanceledDt & "','" & OrderItemNotes & "','" & OrderItemPONum & "','" & OrderItemRetailPrice & "','" & OrderItemSalePrice & "','" & Status & "','" & InsertDate & "')")

MyCommand.Connection = p_MyConnection
MyCommand.ExecuteNonQuery()
End Sub

Hope that helps.
Ben

jds12075-Mar-07 9:04

5-Mar-07 9:04

Question, when I run the program on my computer the files will insert pretty quick. But when I run it on the computer that I installed the program on, I run into some problems. After the program run for about 1 minute or so an error would occur that says cannot connect to MySQL server. However, when I disable windows firewall the program will run without throwing the error but the data inserts slow. It takes about 20 min for the first file to insert on my computer, while on the other it took about an hour. Any ideas why it works fine on my computer and not the other? Is disabling the firewall making it run slow? It's very confusing.

kubben5-Mar-07 9:13

5-Mar-07 9:13

If you have a local MySql database on your local computer, that will always run faster then over the network. It also may help if your local table is empty or doesn't have many records.

I am not sure why disabling the windows firewall causes the program to run. I am guessing for some reason your firewall is preventing access to the sql server.

So on the other computer, if it is going across the network it will be slower then your local PC writings to a local database. It also might be an issue if you already have lots of records on the other MySQL database the inserts can take a longer time. This gets into my suggestion of dropping indexes and some things like that.

Hope that helps.
Ben

jds12076-Mar-07 3:38

6-Mar-07 3:38

If I install MySQL locally on the computer which I installed the program, will the data import faster?

kubben6-Mar-07 3:40

6-Mar-07 3:40

Yes if you are inserting into the local MySql database. Inserts will always be faster if you don't have to go across the network. If you are still inserting across the network the installing MySql will not help the speed. What helps the speed is that the program and the database it is inserting into are on the same computer.

Ben

Mike Dimmick6-Mar-07 2:06

Mike Dimmick

6-Mar-07 2:06

It sounds like you're using the ODBC driver layer to communicate with MySQL. You may get better performance with Connector/Net[^], the native .NET data provider for MySQL.

Also, consider preparing the statement - create the command object once, and call Prepare on it. This means that the server only has to parse the query once, not repeatedly. Don't forget to Dispose the command object once you've finished with it.

Stability. What an interesting concept. -- Chris Maunder

jds12076-Mar-07 3:44

6-Mar-07 3:44

Since this Connector/Net is fairly new to me, I don't know how to change my code to reflect this. Do you think you could provide me with some help, any kind of samples will help.

Thanks

Again Remote Access

alexrad5-Mar-07 1:08

5-Mar-07 1:08

Server: Msg 18452, Level 14, State 1, Line 1
Login failed for user 'IN_FORMO'. Reason: Not associated with a trusted SQL Server connection.

How can i solve this
I read BOL, try all what can find,
Is there something about Windows Accounts or where...else

Re: Again Remote Access

Hesham Amin5-Mar-07 3:05

Hesham Amin

5-Mar-07 3:05

1-post the connection string you use
2-do you use a domain?
3-is the application user added to sql server logins?

Hesham A. Amin
blog

Re: Again Remote Access

alexrad5-Mar-07 4:39

5-Mar-07 4:39

i have done it, it was not sush big proplem
problem was my admin, WAS because he is a**hole!!

Dynamic Filters

Sam Heller5-Mar-07 1:06

5-Mar-07 1:06

IF @ProductID IS NULL OR @ProductID = '' <br />
	BEGIN<br />
		--Do nothing cos you suck balls<br />
		SET @MainQuery = @MainQuery + '';<br />
	END <br />
ELSE <br />
	BEGIN<br />
		SET @MainQuery = @MainQuery + ' AND L.ProductID = ''' + @ProductID + '''';<br />
	END

I am using that code to add additional where clauses but I can't seem to work out how to do the If statement the other way around. Which would allow me to remove the Else chunk. I hope this makes sense as it is a simple issues. Thanks in advance

alexrad5-Mar-07 1:13

5-Mar-07 1:13

where
L.ProductID=
case coalesce(@productid,'') when '' then L.ProductID else @ProductID end

Sam Heller5-Mar-07 1:16

5-Mar-07 1:16

Ok could you explain exactly what this does. I don't understand how it performs the same task as my original code

alexrad5-Mar-07 1:26

5-Mar-07 1:26

If @param is null or '' then where will be:
...where l.product=l.porduct and will do nothing
but if @param has eny value where will be:
...where l.product=@param and will do filtering by column l.product

CASE..when...wnen...END is very powerfull and can be used in meny ways

Sam Heller5-Mar-07 1:33

5-Mar-07 1:33

OK thanks for that but im still not following. Perhaps this might help.

The code should add a filtering AND statement if the parameter was passed. As it stands I am checking for either a null value or no value to be passed and then doing the work in the else part of the statement . So really all I require is the code to check that a parameter has a value. If it does i want to perform the filter.

alexrad5-Mar-07 1:40

5-Mar-07 1:40

ok try this
IF @ProductID IS not NULL OR @ProductID <> ''
begin
SET @MainQuery = @MainQuery + ' AND L.ProductID = ''' + @ProductID + ''''
end
execute(@MainQuery)

Sam Heller5-Mar-07 2:09