Dbvisit Replicate communicates with both source and target database to replicate data. This communication includes reading and writing data through Data Source Name (DSN) configured using ODBC data source and drivers. A DSN for SQL server on source system is required by Dbvisit Replicate to successfully execute configurational scripts that prepares the target MSSQL environment for replication. On target system, a DSN with same name as source system is required by the APPLY service which interacts with target database to replicate changes of source database.
DSN on WIndows
When source oracle database and target MSSQL database are both running on Windows machine, Dbvisit Replicate required identical DSN on both system. A DSN is required on source machine for initial configuration step that interacts with target MSSQL database. On target system a DSN with the same name as source machine is required to replicate changes of source database.
On Windows, a DSN for SQL server can be created by an user with administrative rights from either administrative tools or control panel.
Following is an example of creation of DSN named "mstest" on WIndows 2008 for SQL server running on Windows machine "dbvisit420". Same steps needs to be performed on both source and target machine.
1. Open ODBC Data Source Administration window from either administrative tools or control panel.
2. Click on Add and select SQL Server Native Client.
3. Enter name, description and target server name.
4. Select SQL server authentication and enter credentials of SQL server's user with admin rights.
5. Keep the default values and click on Next for two steps and then Test the connection.
6. If test is successful then go to target server and repeat same steps. Once these two DSN are created, you can start configuring Dbvisit Replicate.
DSN on Linux
If the source oracle database is running on Linux machine then ODBC drivers for Linux is required to set up DSN. ODBC driver manager is required in order to install ODBC driver for Linux. Microsoft provides ODBC driver for Linux that provides native connectivity from Linux to Microsoft SQL Server. You can download ODBC driver for Linux from following page.
http://www.microsoft.com/en-us/download/details.aspx?id=28160
Installation instructions are available on same page. This download includes a script (build_dm.sh) to build ODBC driver manager. Please read instructions carefully and configure your system according to your environment requirement.
Installation of ODBC driver will insert following record in /etc/odbcinst.ini file.
[SQL Server Native Client 11.0]
Description=Microsoft SQL Server ODBC Driver V1.0 for Linux
Driver=/opt/microsoft/sqlncli/lib64/libsqlncli-11.0.so.1790.0
Threading=1
UsageCount=1
Crosscheck whether this specification are inserted or not.
Once the installation is done, DSN can be created. To create DSN, login as root and create a DSN entry in /etc/odbc.ini file.Following is an example of DSN named "mstest"
[mstest]
Driver=SQL Server Native Client 11.0
Description=My Sample ODBC Database Connection
Trace=Yes
Server=<IP Address of Target Windows Machine>
Once DSN is created. "isql" command can be used to test DSN. If DSN is working properly then isql command will return SQL prompt from where you can execute SQL statements on target database running on Windows machine. Following is the example of testing DSN testdb1.
oracle@dbvldemo101[/home/oracle]: isql -v dbtest sa *******
+---------------------------------------+
| Connected! |
| |
| sql-statement |
| help [tablename] |
| quit |
| |
+---------------------------------------+
SQL> select * from avi.sample