Data Type Mapping from SQL server to Oracle

I am using Oracle 12c with heterogenous services connecting to SQL server DB. Some of the columns in the SQL server SB are defined as 'nvarchar(max)'. These are coming over to Oracle as 'long' type columns. I would like these to be 'varchar2' types in Oracle so I do not have any of the restrictions related to 'long' type fields when using. I can create a view in SQlServer to convert the data type ie. nvarchar(100). What is the highest value I can use to make the data show in Oracle as varchar? BTW I tried nvarchar(4000) but that still showed as long. I tried nvarchar(1000), and that did show as varchar.

The maximum value for a nvarchar2 in Oracle is 2000. The mapping -if the remote column is mapped to an Oracle varchar/nvarchar- depends on the data type 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 is 2000.
As your Oracle database uses AL32UTF8 as character set you will get the nvarchar(max) mapped to Oracle longs as the content of your SQL Server nvarchar is stored using UCS2 character set which is covered by the Oracle database charset UTF8. So it shouldn't really matter if the returned string is mapped to an Oracle varchar or nvarchar.

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871250 wrote:
Thank you so much John
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http://john-goodwin.blogspot.com/

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HTH

Data Type Mapping from SQL server to Oracle

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