There are a large number of posts on various difficulties experienced while transferring data from MySQL using Microsoft SQL Server Integration Services. While the transfer of data from MySQL to Microsoft SQL Server 2008 is not fraught with any blocking issues, transfer of data from SQL Server 2008 to MySQL has presented various problems. There are some workarounds suggested. In this article by Dr. Jay Krishnaswamy, data transfer to MySQL using SQL Server Integration Services will be described.

(For more resources on Microsoft, see here.)

If you are new to SQL Server Integration Services (SSIS) you may want to read a book by the same author on Beginners Guide to SQL Server Integration Services Using Visual Studio 2005, published by Packt.

Connectivity with MySQL

For data interchange with MySQL there are two options one of which can be accessed in the connection wizards of SQL Server Integration Services assuming you have installed the programs. The other can be used to set up a ODBC DSN as described further down. The two connection options are:

• MySQL Connector/ODBC 5.1
• Connector/Net 5.2 New versions 6.0 & 6.1

In this article we will be using the ODBC connector for MySQL which can be downloaded from the MySQL Site. The connector will be used to create an ODBC DSN.

Transferring a table from SQL Server 2008 to MySQL

We will transfer a table in the TestNorthwind database on SQL Server 2008 (Enterprise & Evaluation) to MySQL server database. The MySQL database we are using is described in the article on Exporting data from MS Access 2003 to MySQL. In another article, MySQL Linked Server on SQL Server 2008, creating an ODBC DSN for MySQL was described. We will be using the DSN created in that article.

Creating an Integration Services project in Visual Studio 2008

Start the Visual Studio 2008 program from its shortcut. Click File | New | Project... to open the New Project window and select an integration services template from the business intelligence projects by providing a suitable name. The project folder will have a file called Package.dtsx which can be renamed with a custom name.

Add and configure an ADO.NET Source

The Project's package designer will be open displaying the Control Flow tab. Drag and drop a Data Flow Task on to the control flow tabbed page. Click next on the Data Flow tab in the designer to display the Data Flow page. Read the instructions on this page. Drag and drop a ADO.NET Source from the Data Flow Sources items in the Toolbox.

It is assumed that you can set up a connection manager to the resident SQL Server 2008 on your machine. The next figure shows the configured connection manager to the SQL Server 2008. The table (PrincetonTemp) that will be transferred is in the TestNorthwind database. The authentication is Windows and a .NET provider is used to access the data. You may also test the connection by clicking the Test Connection button. If you are not sure of this you can review the free chapter from the book available here.

If the connection shown above is correctly configured, the test should indicate a successful connection. Right click the ADO.NET source and from the drop-down click Edit. The ADO.NET Source Editor gets displayed. As mentioned earlier you should be able to access the table and view objects on the database as shown in the next figure.

We have chosen to transfer a simple table, PrincetonTemp from the TestNorthwind database on SQL Server 2008. It has a only couple of columns as shown in the Columns page of the ADO.NET Source Editor.

The default for the Error page setting has been assumed, that is, if there is an error or truncation of data the task will fail.

Add an ADO.NET destination and port the data from the source

Drag and drop an ADO.NET destination item from under Data Flow Destinations items in the Toolbox on to the data flow page of the designer. There are two ways to arrange for the data to flow from source to the destination. The easy way is just drag the green dangling line from the source with your mouse and let go on the ADO.NET destination. A solid line will connect the source and the destination as shown.

Beginners Guide to SQL Server Integration Services Using Visual Studio 2005

An ideal book and eBook for trainers who want to teach an introductory course in SQL Server Integration Services or, to those who want to study and learn SSIS in a little over two weeks.

(For more resources on Microsoft, see here.)

Configure a connection manager to connect to MySQL

In the Connection Manager's pane under the Package designer right click to display a pop-up menu which allows you to make a new connection. When you agree to make a new ADO.NET Connection the Configure ADO.NET connection Manager's window shows up and click on New... button on this page.

The connection manager's page gets displayed as shown. In the Providers drop-down you will see a number of providers. There are the two providers that you can use, the ODBC through the connector and the MySQL Data Provider.

Click on the Odbc Data Provider. As mentioned previously we will be using the System DSN MySQL_Linkcreated earlier for the other article shown in the drop-down list of available ODBC DSN's.

Provide the USERID and Password; click the Test Connection button. If all the information is correct you should get a success message as shown.

Close out of the message as well as the Configure ADO.NET Connection Manager windows. Right click the ADO.NET Destination to display its editor window. In the drop-down for connection manager you should be able to pick the connection Manager you created in the previous step (MySQL_INK.root) as shown.

Click on the New... button to create a Table or View. You will get a warning message regarding not knowing the mapping to SSIS as shown.

Click OK. The create table window gets displayed as shown. Notice that the table is displaying all the columns from the table that the source is sending out.

If you were to click OK, you would get an error that the syntax is not correct as shown.

Modify the table as shown to change the destination table name (your choice) and the data type.

CREATE TABLE From2k8(

"Id" INT,

"Month" VARCHAR(10),

"Temperature" DOUBLE PRECISION,

"RecordHigh" DOUBLE PRECISION

)

Click OK. Again you get the same error regarding syntax not being correct. Modify the Create Tablestatement further as shown.

CREATE TABLE From2k8 (

Id INT,

Month VARCHAR(10),

Temperature DOUBLE PRECISION,

RecordHigh DOUBLE PRECISION

)

Click OK after the above modification. The table gets added to the ADO.NET Destination Manager Editor as shown.

Click on the Mappings on the left side of the ADO.NET Destination Editor. The column mappings page gets displayed as shown. We accept the default settings for Error Output page.

Click OK. Build the project and execute the package by right clicking the package and choosing Execute Package. The program runs and processes the package and ends up being unsuccessful with the error message in the Progress tab of the project as shown (only relevant message is shown here).

....

.....

[SSIS.Pipeline] Information: Execute phase is beginning.

[ADO NET Destination 1 [165]] Error: An exception has occurred during data insertion, 

the message returned from the provider is: ERROR [42000] [MySQL][ODBC 5.1 Driver]

[mysqld-5.1.30-community]You have an error in your SQL syntax; check the manual that 

corresponds to your MySQL server version for the right syntax to use near '"Id", 

"Month", "Temperature", "RecordHigh") VALUES (1, 'Jan ', 4.000000000' at line 1

[SSIS.Pipeline] Error: SSIS Error Code DTS_E_PROCESSINPUTFAILED. The ProcessInput 

method on component "ADO NET Destination 1" (165) failed with error code 0xC020844B 

while processing input "ADO NET Destination Input" (168). The identified component 

returned an error from the ProcessInput method. The error is specific to the component,

but the error is fatal and will cause the Data Flow task to stop running. There may 

be error messages posted before this with more information about the failure.

[SSIS.Pipeline] Information: Post Execute phase is beginning.

......

....

Task Data Flow Task failed

....

Start the MySQL Server and login to it. Run the following commands as shown in the next figure. By setting the mode to 'ANSI' makes the syntax more standard like as MySQL can cater to clients using other SQL modes. This is why the above error is returned although the syntax itself appears correct. In fact a create statement run on command line to create a table directly on MySQL could not create a table and returned an error when SSIS was used to create the same table.

After running the above statements, build the BI project and execute the package. This time the execution is will be successful and you can query the MySQL Server as in the following:

Summary

The article describes step by step transferring a table from SQL Server 2008 to MySQL using ODBC connectivity. For successful transfer the data type differences between SQL Server 2008 and the MySQL version must be properly taken into consideration as well as correctly setting the SQL_Mode property of MySQL Server.

MySQL Clustering Config

Posted October 6, 2008
Filed under: Uncategorized | Tags: cluster, Clustering, MySQL |

I’ve had two positive comments to my previous post so I figured it was time to write an update regarding how my work has been going.

The MySQL clustered database is part of a large project I’ve been working on for the last 2 months. The basic server setup is two clustered JBoss 4.2.3Application Servers running on top of two clustered MySQL 5.0.67 servers. There is a 3rd Server which is a backup which currently only runs the MySQL manager ment console. I’ve noticed that even if there is high load on the 2 NDB data nodes, the Management console does not do much.

The four main servers run 2 Dual-Core AMD Opteron(tm) Processors with 8 gig of ram.

Even though alot of my work has been to rework my own code in order to optimize and improve it, alot of time has been spent looking for a configuration for the MySQL cluster that would cope with the load as I found that it was quite easy to kill the cluster in the beginning.

The config I am currently using is below and following are some results of the load testing I’ve been doing.

[TCP DEFAULT]

SendBufferMemory=2M

ReceiveBufferMemory=2M

[NDBD DEFAULT]

NoOfReplicas=2

# Avoid using the swap

LockPagesInMainMemory=1

#DataMemory (memory for records and ordered indexes)

DataMemory=3072M

#IndexMemory (memory for Primary key hash index and unique hash index)

IndexMemory=384M

#Redolog

# (2*DataMemory)/64MB which is the LogFileSize for 5.0

NoOfFragmentLogFiles=96

#RedoBuffer of 32M. If you get "out of redobuffer" then you can increase it but it

#more likely a result of slow disks.

RedoBuffer=32M

MaxNoOfTables=4096

MaxNoOfAttributes=24756

MaxNoOfOrderedIndexes=2048

MaxNoOfUniqueHashIndexes=512

MaxNoOfConcurrentOperations=1000000

TimeBetweenGlobalCheckpoints=1000

#the default value for TimeBetweenLocalCheckpoints is very good

TimeBetweenLocalCheckpoints=20

# The default of 1200 was too low for initial tests. But the code has been improved alot

# so 12000 may be too high now.

TransactionDeadlockDetectionTimeout=12000

DataDir=/var/lib/mysql-cluster

BackupDataDir=/var/lib/mysql-cluster/backup

[MYSQLD DEFAULT]

[NDB_MGMD DEFAULT]

# Section for the cluster management node

[NDB_MGMD]

# IP address of the management node (this system)

HostName=10.30.28.10

# Section for the storage nodes

[NDBD]

# IP address of the first storage node

HostName=10.30.28.11

[NDBD]

# IP address of the second storage node

HostName=10.30.28.12

# one [MYSQLD] per storage node

[MYSQLD]

[MYSQLD]

Here are some numbers of what I’ve been able to get out of the MySQL cluster. One iteration of my code results in:
12 selects
10 inserts
10 updates
4 deletes
This might sound like a lot, but it is a service oriented application that relies on persistent JBoss queues and demands 100% redundancy so even if the server dies, it will pickup where it died and does not loose any data.

My first benchmark was 10 000 iterations which is the current load I can expect on the application over the course of an hour i.e.
12 000 selects
10 000 inserts
10 000 updates
4 000 deletes
This took a total of 93 seconds producing just over 100 iterations per second.

The second test to really put the application and environment to the test was to run 100 000 iterations. This test completed in roughly 15 minutes producing around 110 iterations per second. This is about 10x the load we’d expect to see during the course of one hour but it is nice to see the setup has the ability to grow quite a bit before we need more hardware. 

I am currently working on setting up a third test which will run 100 000 iterations every hour for 10 hours producing 1 millions rows of data.

Possibly related posts: (automatically generated)

·         I’m half way to being MySQL certified

·         Oracle buying Sun, therefore adquiring MySQL!!!!!

·         Tips & Tricks from MySQL Experts

 출처 : http://bieg.wordpress.com/2008/10/06/mysql-clustering-config/