Migration from MSSQL 2K on Windows to Oracle 9i on Linux

How is the NTEXT Datatype column in MSSQL 2K no Windows to be migrated to Oracle 9.2 on Linux? What is the equivalent datatype in Oracle 9i?=20

Also migration in general of the overall database from MSSQL 2K on Windows To Oracle 9.2 on Linux?

INFO:-
Data contained in the respective ntext field is only English characters values.
This is a production database accessed over the internet by customers. We can probably bring down the database for a MAX of 1 hour in a 24 hour cycle.
Database size is only 3 GB.

Any advice, tools, utilities, freeware, docs, links, precautions?

I shall provide any clarifications.

Thanks in advance.

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