Migrating from Linux/Solaris to Windows and vice versa

It's not clear from your question whether your Oracle database(s) will remain at the same release level across platforms so I'm assuming that they will. It is also not apparent from your question whether we are dealing with Oracle9i and lower or Oracle 10g. If we're dealing with Oracle9i and below, the only option to migrate your database across platforms is to use the Oracle utilities export and import.

If your database is at Oracle 10g, you have another option, which is to use the cross-platform transportable tablespaces...

feature. Solaris, Linux and Windows are supported platforms (you can query the view V$TRANSPORTABLE_PLATFORM to see supported platforms) but they are of different endianness. Solaris is big endian while Linux and Windows are little endian, so there may be an additional step involved to convert the tablespaces being transported on either the source or target side.

To read more about the cross-platform transportable tablespace feature, download the Oracle Database Administrator's Guide 10g (release 10.2) from Oracle Technology Network, which can be found here.