1. check the blocks from dba_tables

SQL> create table test(id number,
2 name varchar2(50));

Table created

SQL> select table_name,blocks,empty_blocks,num_rows from user_tables where table_name ='TEST';

TABLE_NAME BLOCKS EMPTY_BLOCKS NUM_ROWS
------------------------------ ---------- ------------ ----------
TEST

SQL> insert into test values(1,'test');

1 row inserted

SQL> commit;

Commit complete

SQL> select table_name,blocks,empty_blocks,num_rows from user_tables where table_name ='TEST';

TABLE_NAME BLOCKS EMPTY_BLOCKS NUM_ROWS
------------------------------ ---------- ------------ ----------
TEST

SQL> select * from test;

ID NAME
---------- --------------------------------------------------
1 test

SQL> insert into test values(2,'2012');

1 row inserted

SQL> commit;

Commit complete

2. analyze table

SQL> SELECT DBMS_ROWID.ROWID_BLOCK_NUMBER(rowid) ,DBMS_ROWID.ROWID_RELATIVE_FNO(rowid), t.*
2 FROM TEST t;

DBMS_ROWID.ROWID_BLOCK_NUMBER( DBMS_ROWID.ROWID_RELATIVE_FNO( ID NAME
------------------------------ ------------------------------ ---------- --------------------------------------------------
61488 7 1 test
61488 7 2 2012

SQL> ANALYZE TABLE test validate structure cascade online;

Table analyzed

SQL> insert into test values(3,'haidian');

1 row inserted

SQL> SELECT DBMS_ROWID.ROWID_BLOCK_NUMBER(rowid) ,DBMS_ROWID.ROWID_RELATIVE_FNO(rowid), t.*
2 FROM TEST t;

DBMS_ROWID.ROWID_BLOCK_NUMBER( DBMS_ROWID.ROWID_RELATIVE_FNO( ID NAME
------------------------------ ------------------------------ ---------- --------------------------------------------------
61484 7 3 haidian
61488 7 1 test
61488 7 2 2012

SQL>