I'm carrying out a project on Database Migration from UNIX to Windows NT 4.0 (7.3.4 to 8.0.6).
Below are the steps taken:

· Export database from UNIX server in 7.3.4 to Windows NT in 8.0.6
· FTP to NT in binary mode
· Pre-created a new database in 8.0.6 on Windows NT (using Database Assistant, a typical database with all the default tablespaces, datafiles, and rollback segments.)
· All the tablespaces, datafiles, and rollback segments are created to the same name as the original database; all the sizes are increased 50% (except for system tablespace to be remained in its default name with default datafiles and rollback segments)

After importing the database using the Data Manager, following errors encountered from the import log file:
1. IMP-00017: Following statement failed with Oracle error 904
2. IMP-00003: Oracle error 904 encountered.
3. IMP-00904: Invalid column name.
4. IMP-00041: Warning: objected created with compilation warnings

A snapshot of errors shown from the import log file (invalid column name):
IMP-00017: following statement failed with ORACLE error 904:
"CREATE INDEX "DEF$_CALLDEST_N1" ON "DEF$_CALLDEST" ("DEFERRED_TRAN_DB" , "D"
"EFERRED_TRAN_ID" , "CALLNO" , "DUMMY_BUFFER_NUMBER" ) PCTFREE 10 INITRANS "
"2 MAXTRANS 255 STORAGE (INITIAL 10240 NEXT 10240 MINEXTENTS 1 MAXEXTENTS 12"
"1 PCTINCREASE 50 FREELISTS 1) TABLESPACE "TOOLS""
IMP-00003: ORACLE error 904 encountered
ORA-00904: invalid column name
IMP-00017: following statement failed with ORACLE error 904:
"ALTER TABLE "DEF$_CALLDEST" ADD CONSTRAINT "DEF$_CALLDEST_PRIMARY" PRIMARY"
" KEY ("DEFERRED_TRAN_DB","DEFERRED_TRAN_ID","CALLNO","DUMMY_BUFFER_NUMBER","
""DBLINK") USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 STORAGE (INITIAL 1"
"0240 NEXT 10240 MINEXTENTS 1 MAXEXTENTS 121 PCTINCREASE 50 FREELISTS 1 ) TA"
"BLESPACE "TOOLS""
IMP-00003: ORACLE error 904 encountered
ORA-00904: invalid column name
IMP-00017: following statement failed with ORACLE error 904:
"COMMENT ON COLUMN "DEF$_CALLDEST"."DEFERRED_TRAN_DB" IS 'Originating datab"
"ase for the deferred transaction'"
IMP-00003: ORACLE error 904 encountered
ORA-00904: invalid column name
......etc...

Besides,
1. How to test that the whole database is successfully imported?
2. Can 7.3.4 be migrated to 8.0.6 simultaneously while migrating across platforms?
3. Will the filesize change after imported to the new DB?

Thanks a lot for any help and advice.