dellera@ORACLE9I> 
dellera@ORACLE9I> -- table t
dellera@ORACLE9I> create table t (
  2    pk   int,
  3    data varchar2(20)
  4  );

Table created.

dellera@ORACLE9I> 
dellera@ORACLE9I> alter table t add constraint t_pk primary key(pk);

Table altered.

dellera@ORACLE9I> create unique index t_uq on t (pk, data);

Index created.

dellera@ORACLE9I> create index t_data_idx on t (data);

Index created.

dellera@ORACLE9I> 
dellera@ORACLE9I> insert into t (pk, data)
  2  select rownum, 'data-' || rownum
  3    from all_objects
  4   where rownum <= 100;

100 rows created.

dellera@ORACLE9I> 
dellera@ORACLE9I> create trigger t_trig
  2  after insert or update or delete on t
  3  for each row
  4  begin
  5    dbms_output.put_line (:new.pk);
  6  end;
  7  /

Trigger created.

dellera@ORACLE9I> 
dellera@ORACLE9I> create or replace procedure p
  2  as
  3  begin
  4    for i in (select * from t) loop
  5  	  dbms_output.put_line (i.pk);
  6    end loop;
  7  end p;
  8  /

Procedure created.

dellera@ORACLE9I> show errors;
No errors.
dellera@ORACLE9I> 
dellera@ORACLE9I> -- table t_stage
dellera@ORACLE9I> create table t_stage
  2  partition by range (pk) (
  3    partition p_all_rows values less than (maxvalue)
  4  )
  5  as
  6  select * from t where 1=0;

Table created.

dellera@ORACLE9I> 
dellera@ORACLE9I> alter table t_stage
  2  add constraint t_stage_pk primary key (pk)
  3  using index local;

Table altered.

dellera@ORACLE9I> 
dellera@ORACLE9I> create unique index t_stage_uq on t_stage (pk, data) local;

Index created.

dellera@ORACLE9I> create index t_stage_data_idx on t_stage (data) local;

Index created.

dellera@ORACLE9I> 
dellera@ORACLE9I> insert /*+ append */ into t_stage
  2  select -pk, data
  3    from t;

100 rows created.

dellera@ORACLE9I> commit;

Commit complete.

dellera@ORACLE9I> 
dellera@ORACLE9I> -- open and fetch a statement on t
dellera@ORACLE9I> set echo off
"------------------------------------------------------------------------------------"
Now press <enter> a couple of times to fetch some rows from t,
and keep the statement open.

Then go in another session and issue:

alter table t_stage
exchange partition p_all_rows
with table t
including indexes
without validation;

Then, get back here, press <enter> until all the rows have been fetched;
you will see that the old rows are fetched.
"------------------------------------------------------------------------------------"
dellera@ORACLE9I> set lines 100
dellera@ORACLE9I> set pages 13
dellera@ORACLE9I> set pause on
dellera@ORACLE9I> select * from t;

        PK DATA
---------- ------------------------------------------------------------
         1 data-1
         2 data-2
         3 data-3
         4 data-4
         5 data-5
         6 data-6
         7 data-7
         8 data-8
         9 data-9
        10 data-10

        PK DATA
---------- ------------------------------------------------------------
        11 data-11
        12 data-12
        13 data-13
        14 data-14
        15 data-15
        16 data-16
        17 data-17
        18 data-18
        19 data-19
        20 data-20

        PK DATA
---------- ------------------------------------------------------------
        21 data-21
        22 data-22
        23 data-23
        24 data-24
        25 data-25
        26 data-26
        27 data-27
        28 data-28
        29 data-29
        30 data-30

        PK DATA
---------- ------------------------------------------------------------
        31 data-31
        32 data-32
        33 data-33
        34 data-34
        35 data-35
        36 data-36
        37 data-37
        38 data-38
        39 data-39
        40 data-40

        PK DATA
---------- ------------------------------------------------------------
        41 data-41
        42 data-42
        43 data-43
        44 data-44
        45 data-45
        46 data-46
        47 data-47
        48 data-48
        49 data-49
        50 data-50

        PK DATA
---------- ------------------------------------------------------------
        51 data-51
        52 data-52
        53 data-53
        54 data-54
        55 data-55
        56 data-56
        57 data-57
        58 data-58
        59 data-59
        60 data-60

        PK DATA
---------- ------------------------------------------------------------
        61 data-61
        62 data-62
        63 data-63
        64 data-64
        65 data-65
        66 data-66
        67 data-67
        68 data-68
        69 data-69
        70 data-70

        PK DATA
---------- ------------------------------------------------------------
        71 data-71
        72 data-72
        73 data-73
        74 data-74
        75 data-75
        76 data-76
        77 data-77
        78 data-78
        79 data-79
        80 data-80

        PK DATA
---------- ------------------------------------------------------------
        81 data-81
        82 data-82
        83 data-83
        84 data-84
        85 data-85
        86 data-86
        87 data-87
        88 data-88
        89 data-89
        90 data-90

        PK DATA
---------- ------------------------------------------------------------
        91 data-91
        92 data-92
        93 data-93
        94 data-94
        95 data-95
        96 data-96
        97 data-97
        98 data-98
        99 data-99
       100 data-100

100 rows selected.

dellera@ORACLE9I> set pause off
dellera@ORACLE9I> set pages 9999
dellera@ORACLE9I> 
dellera@ORACLE9I> -- object defined on/dependent from t are still VALID
dellera@ORACLE9I> select object_name, status from user_objects where object_name in (select name from user_dependencies where referenced_name='T');

OBJECT_NAME                    STATUS
------------------------------ ---------------------
P                              VALID
T_TRIG                         VALID

dellera@ORACLE9I> 
dellera@ORACLE9I> spool off