Read using non-unique key

[KumarVishal]

I am trying to read a column which is non - unique and not -sorted.

Instead of usual Read , I was trying the new syntax using non-unique key. But it doesn't give consistent result and even takes more time ?

PFB the sample code I have used. In the both the read same row should return as a result which does not happen ?

TYPES:
BEGIN OF LTY_domains,
as4local TYPE as4local,
as4vers TYPE as4vers,
datatype TYPE datatype_d,
leng TYPE ddleng,
outputlen TYPE outputlen,
decimals TYPE decimals,
AS4DATE TYPE AS4DATE,
END OF lty_domains.

DATA:
lt_domains TYPE TABLE OF LTY_domains,
lt_domains_key TYPE TABLE OF LTY_domains
WITH NON-UNIQUE SORTED KEY length COMPONENTS AS4DATE.

SELECT
as4local,
as4vers,
datatype,
leng,
outputlen,
decimals,
AS4DATE
FROM dd01l
INTO TABLE @lt_domains.

lt_domains_key = lt_domains.
DATA:
lv_t1 TYPE timestampl,
lv_t2 TYPE timestampl,
lv_tf TYPE timestampl.

GET TIME STAMP FIELD lv_t1.
READ TABLE lt_domains INTO DATA(ls_domains)
WITH KEY as4date = '20110901'.
GET TIME STAMP FIELD lv_t2.
WRITE : / | OLD = { lv_t2 - lv_t1 } { ls_domains-as4date } - { sy-tabix } |.

CLEAR : lv_t1,lv_t2.
GET TIME STAMP FIELD lv_t1.
READ TABLE lt_domains_key INTO DATA(ls_domains_key)
WITH KEY length COMPONENTS as4date = '20110901'.
GET TIME STAMP FIELD lv_t2.
WRITE : / | NEW = { lv_t2 - lv_t1 } { ls_domains_key-as4date } - { sy-tabix } |.