Mapping of Data Type from SQL Server to Oracle

I use Oracle 12 c with heterogeneous services connects to SQL server DB. Some of the columns in the SB of SQL Server are defined as 'nvarchar (max). These come to Oracle as columns of type "long". I would like that these are 'varchar2' types in Oracle, so I do not have any restrictions related to the fields of type "long" when using. I can create a view in SQL Server to convert the data type IE. nvarchar (100). What is the highest value that I can use to make the data to display in Oracle as a varchar? BTW, I tried nvarchar (4000), but which showed any longer. I tried nvarchar (1000) and who showed as a varchar.

The maximum value for an nvarchar2 in Oracle is 2000. Mapping - If the remote column is mapped to an Oracle varchar/nvarchar - depends on the type of data returned by the ODBC driver. When the driver returns SQL_Varchar, then the maximum precision is 4000 and when it will map it to SQL_WVarchar then it's 2000.

As your Oracle database uses AL32UTF8 as set of characters that the maps to the Oracle long as your SQL Server nvarchar content is stored using characters UCS2 nvarchar (max), you will get the value that is covered by the database Oracle UTF8 character set. So it shouldn't really matter if the returned string is mapped to an Oracle, varchar or nvarchar.

Tags: Database

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