By: Hassan Shareef,
Since 10 years
There are some situations where there is a need to migrate databases
from MS SQL Server to MySQL. This could be due to several reasons. Like for
example, your company has website which uses MySQL in the backend and they
have MSSQL for their in-house applications. Moving data from MSSQL to MySQL
is a frequent necessity that needs to be performed by DBA's.
MySQL / MariaDB is the world's most prominent open source database. Its simple to utilize and in the meantime gives performance, dependability and versatility. MySQL / MariaDB is the primary choice database for Web-based applications. It's utilized by web monsters like Facebook, Twitter, YouTube, Yahoo!, Wikipedia and a huge number of average sized organizations.
On of the significant advantage admitted by clients in reviews is it's minimal effort. The cost of running and keeping up MySQL / MariaDB is quantum of degrees less as compare to alternate databases.
Cross database migration is a complex process and it needs to be performed with proper planning and schedule. I have chosen the sample Northwind database which is given by Microsoft MSSQL as a demo database and tried to convert it to MySQL using the following tools.
Here are the tools which I have tested in the order of their efficiency and performance
It stands apart so far from all other tools. Faced the least amount of
issues while converting from SQL Server to MySQL. There were only 2 issues
related to default values which needed manual attention otherwise the
conversion ran smoothly. The best thing which I liked was the ability to
load into existing tables also. None of the other tools lets you load data
into existing tables, they only create fresh tables whereas Data Loader can
load data into fresh tables as well as lets you load into existing tables
and even it allows column mappings. The other good thing is it lets you
Synchronize source and target tables by defining your comparison columns or
you can take the already chosen default Primary key columns. It also comes
with it's own scheduler.
The other best feature I liked is it also comes with a separate command line tool to execute saved sessions either from other applications or you can also use Windows Task Scheduler to execute saved Sessions at particular intervals.
It's the free tool from MySQL stable. It allows you to convert from
MS SQL to MySQL using ODBC drivers. You should have SQL Server ODBC driver
installed in order to use this tool. Once you installed the ODBC driver you
will need to create ODBC DSN by clicking on ODBC Administrator in windows
Control panel. Once DSN is created you can call it from Workbench to do the
conversion. Although it has migrated the tables it failed to convert the
views. Another thing which was lacking is it doesn't let you load the data
into existing tables leave alone column mapping. It also doesn't let you
save the migration jobs. No synchronization support.
The MS SQL Server comes with it's own Export and Import tool. It also comes free with Express editions but in Express editions it doesn't let you save migration jobs.
It utilizes ODBC Drivers for conversion. We have to create ODBC Data Source by going into Control Panel first. If you are running the Import & Export tool in the same machine where MSSQL database is running then there is no need to download and install the ODBC driver as this driver is automatically installed when you install MS SQL Server.
You also need to install MySQL ODBC Driver. If you don't it installed, then you can download it from MySQL website.
After installation of ODBC drivers start ODBC administrator and create Data sources. To start ODBC Administrator
1 Click on Start Menu in Windows
2. Type Data Sources in Run command text box as shown below
3 Click on Data Sources (ODBC) and you will get a window as shown below
4 Click on User DSN or System DSN tab and click Add button. Then it will prompt you to choose DSN (Data Source Name), ODBC driver details and etc.