Oracle10g database migration from MID to MIT

Dear all,
im currently doing the migration from production server (MID) to dev server (MIT).
i've use 2 method below but all encounted the error and fail to import. hope some one can point the error and explain the some of my problem.
1. used oracle exp and imp
full database.
- i've exp the full database and drop all the current R3 table by following selection syntax.
select 'drop table sapsr3.' ||table_name|| ';' from user_table.
- but some table fail to drop because some of the table name consist '//'
- after doing imp, R3 cannot be start and keep show yellow status.
- log file display 'waiting for termination icman'
Q1. is that the method i did is correct?
Q2. how do i drop the table which start from '//'
single table.
- i've exp a single table from database then imp.
- while i check on SQL+. the table exist and consist data.
- but when i check on GUI. the table doesn't exist.
Q3. is that the table imported is only import to oracle. but not R3?
Q4. how to make it completely update to R3?
2. used SAP brtools.
full database.
- i've export a complete database backup(MID) by selected
backup and recovery -> database backup -> backup device type (disk)
- then import the backup to MIT
restore and recovery->while dabase reset->select consistent database backup()->
check the status of database files()->restore control files and redolog files()->
restore data files() ->reset program status()
note: () means the whole process.
Q5. database restored from MID to MIT, but the MIT could not start R3. may i know what i miss to cross R3 could not start?
single table
- export single table thru segment management-> export table from MID.
- import single table thru segment management-> import table to MIT.
Q6. error show oracle_home didnt set. but i've check on system enviroment and oracle_home is there. and i double confirm the variable by enter 'set'. Oracle_home still there. should i set oracle_home in cmd again?
note: pls state which method is preferable and which question is answering.
thanks and appreciate from yours reply.

finish patch the r3load and add the dbs/ora/tnsname = <SID> in the tnsname.
but the error is still the same.
INFO 2009-08-17 18:48:29
Output of C:\usr\sap\MID\SYS\exe\uc\NTI386\R3load.exe -testconnect is written to the logfile R3load.exe.log.
WARNING 2009-08-17 18:48:29
Execution of the command "C:\usr\sap\MID\SYS\exe\uc\NTI386\R3load.exe -testconnect" finished with return code 2. Output:
sapparam: sapargv( argc, argv) has not been called.
sapparam(1c): No Profile used.
sapparam: SAPSYSTEMNAME neither in Profile nor in Commandline
C:\usr\sap\MID\SYS\exe\uc\NTI386\R3load.exe: START OF LOG: 20090817184829
C:\usr\sap\MID\SYS\exe\uc\NTI386\R3load.exe: sccsid @(#) $Id: //bas/700_REL/src/R3ld/R3load/R3ldmain.c#20 $ SAP
C:\usr\sap\MID\SYS\exe\uc\NTI386\R3load.exe: version R7.00/V1.4 [UNICODE]
Compiled Jul 7 2009 08:04:27
C:\usr\sap\MID\SYS\exe\uc\NTI386\R3load.exe -testconnect
DbSl Trace: Cannot connect: dbs/ora/tnsname in profile missing
(DB) ERROR: db_connect rc = 256
DbSl Trace: Cannot connect: dbs/ora/tnsname in profile missing
(DB) ERROR: DbSlErrorMsg rc = 29
C:\usr\sap\MID\SYS\exe\uc\NTI386\R3load.exe: job finished with 1 error(s)
C:\usr\sap\MID\SYS\exe\uc\NTI386\R3load.exe: END OF LOG: 20090817184829
ERROR 2009-08-17 18:48:29
CJS-30023 Process call 'C:\usr\sap\MID\SYS\exe\uc\NTI386\R3load.exe -testconnect' exits with error code 2. For details see log file(s) R3load.exe.log.
ERROR 2009-08-17 18:48:29
FCO-00011 The step testDatabaseConnection with step key |NW_Export|ind|ind|ind|ind|0|0|NW_ABAP_Export_Dialog|ind|ind|ind|ind|4|0|NW_ABAP_Export|ind|ind|ind|ind|0|0|testDatabaseConnection was executed with status ERROR .
INFO 2009-08-17 18:48:56
An error occured and the user decide to stop.\n Current step "|NW_Export|ind|ind|ind|ind|0|0|NW_ABAP_Export_Dialog|ind|ind|ind|ind|4|0|NW_ABAP_Export|ind|ind|ind|ind|0|0|testDatabaseConnection".

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