Table maintenance Vs Maintenance view

Hi,
I would like to know the dif between T.Maintanance And Maintenance view.
As we know as per the def we know Maintenance view will be used to maintain a table. But I have never created any M.view for the same.
However we use Table maintenance generator and SM30 for the same. How these 2 concepts are differnet?
Which one is the best method 2 use?
what one step and two setp process? Advantage and usage of 2step process?
Thanks in advance.
PRa

Praneet
In SM30 we can enter values manually
main diff between these two is "Authorization"
in sm30 authorization for all users not allowed.
for extended table maintenance see this below link
http://help.sap.com/saphelp_sm40/helpdata/en/67/86b257415811d1893d0000e8323c4f/frameset.htm
Reward if usefull
Regards
Raghav

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    table     T_MY_OBJECT_TAB_OUTER
         id          varchar2(20)     not null
    ,     outerIndex     integer          not null
    ,     primary key (id, outerIndex)
    ,     foreign key (id) references T_MY_OBJECT on delete cascade
    create
    table     T_MY_OBJECT_TAB_INNER
         id          varchar2(20)     not null
    ,     outerIndex     integer          not null
    ,     innerIndex     integer          not null
    ,     innerValue     varchar2(20)
    ,     primary key (id, outerIndex, innerIndex)
    ,     foreign key (id, outerIndex) references T_MY_OBJECT_TAB_OUTER on delete cascade
    create or replace view V_MY_OBJECT
    of TMyObject
    with object identifier (id)
    as
    select     t.id
    ,     cast(multiset(
              select     cast(multiset(
                        select     i.innerValue
                        from     T_MY_OBJECT_TAB_INNER i
                        where     i.id = o.id
                        and     i.outerIndex = o.outerIndex
                   ) as TInnerNestedTable)
              from     T_MY_OBJECT_TAB_OUTER o
              where     o.id = t.id
         ) as TOuterNestedTable)
    from     T_MY_OBJECT t
    create or replace trigger TR_II_V_MY_OBJECT
    instead of insert on V_MY_OBJECT
    for each row
    begin
         insert
         into     T_MY_OBJECT
              id
         values     (
              :new.id
         insert
         into     T_MY_OBJECT_TAB_OUTER
              id
         ,     outerIndex
         select     :new.id
         ,     rownum
         from     table(:new.tab) o;
         insert
         into     T_MY_OBJECT_TAB_INNER
              id
         ,     outerIndex
         ,     innerIndex
         ,     innerValue
         select     :new.id
         ,     o.outerIndex
         ,     rownum
         ,     value(i)
         from     (
              select     :new.id
              ,     rownum outerIndex
              ,     value(o) innerTab
              from     table(:new.tab) o
              ) o
         ,     table(o.innerTab) i;
    end;
    insert
    into     V_MY_OBJECT
    values     (
         new TMyObject(
              'A'
         ,     TOuterNestedTable(
                   TInnerNestedTable('A','B','C')
              ,     TInnerNestedTable('AA')
              ,     TInnerNestedTable('AB')
    insert
    into     V_MY_OBJECT
    values     (
         new TMyObject(
              'B'
         ,     TOuterNestedTable(
                   TInnerNestedTable('X','Y','Z')
              ,     TInnerNestedTable('Hello', 'World!')
    /Selecting from the view shows the results:
    select     value(o)
    from     V_MY_OBJECT o
    VALUE(O)(ID, TAB)
    TMYOBJECT('A', TOUTERNESTEDTABLE(TINNERNESTEDTABLE('A', 'B', 'C'), TINNERNESTEDTABLE('AA'), TINNERNESTEDTABLE('AB')))
    TMYOBJECT('B', TOUTERNESTEDTABLE(TINNERNESTEDTABLE('X', 'Y', 'Z'), TINNERNESTEDTABLE('Hello', 'World!')))
    2 rows selected.Hope that helps...
    Gerard

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