Oracle Database Discussions

hello every DBA,
I need to understand the meaning of the statistic "bytes sent via SQL*Net to client"

#sqlplus / as sysdba
SQL> set autotrace traceonly stat
SQL> select * from TOTO;

70755 rows selected.

Statistics
----------------------------------------------------------
0 recursive calls
0 db block gets
11598 consistent gets
0 physical reads
0 redo size
4008990 bytes sent via SQL*Net to client
52364 bytes received via SQL*Net from client
4718 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
70755 rows processed


1) My connection is local ( sqlplus / as sysdba), So I don't use any sql*net connexion.
2) The size of the table TOTO is about 96M, and total rows = 70755.

My aim is to understand the the meaning of the number 4008990 ?
I try this test many times, this number is the same.


Thanks in advance for your answers.
Majda.