WHERE user_segments does not work

Hi all
I created this table:
CREATE TABLE MISURA_BYTE (
 KEY_ID_EVENTO       VARCHAR2(5),
 CAMPO VARCHAR2(2)
 )
try to see how bytes were allocated:
select * from USER_SEGMENTS  where segment_name='MISURA_BYTE'
How to get:
SQL> select tablespace_name,bytes,blocks from USER_SEGMENTS  where segment_name='MISURA_BYTE';

TABLESPACE_NAME                     BYTES     BLOCKS
------------------------------ ---------- ----------
USERS                               65536          8
Insert a line:
INSERT INTO MISURA_BYTE VALUES ('12345','1') 
INSERT INTO MISURA_BYTE VALUES ('12345','1') 
INSERT INTO MISURA_BYTE VALUES ('12345','1') 
INSERT INTO MISURA_BYTE VALUES ('12345','1') 
INSERT INTO MISURA_BYTE VALUES ('12345','1') 
INSERT INTO MISURA_BYTE VALUES ('12345','1') 
INSERT INTO MISURA_BYTE VALUES ('12345','1')
but the indicated byte are the same:
SQL> select tablespace_name,bytes,blocks from USER_SEGMENTS  where segment_name='MISURA_BYTE';

TABLESPACE_NAME                     BYTES     BLOCKS
------------------------------ ---------- ----------
USERS                               65536          8
Why this happens, I need to know the really bytes allocated, and how she develops when certain lines are inserted. Is it possible?

Thank you
F.

Whenever you create an oracle table / index affects certain blocks of numbers called initial measure. Insert new data begins to fill the space and once full oracle allocates the next measurement.

In your test case you enter only very few lines. Try 100000 inserted rows and check the SEGMENTS.

also, you can query DBA_EXTENTS

-Thank you

Tags: Database

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