Size in bytes of each datatype?

Question

Hi
Im a spanish user of oracle 9i. I want to know what is the size of each datatype in Oracle 9i.Ie, how many bytes is a float?, or a date? or a varchar2(20)?
I have been searching in this website, but I did not find anything.
Regards,
Antonio

Answer 1

Use the good old "let's put my hands on this" approach:TEST> create table test_number
  2  (
  3  a number(1),
  4  b number(2),
  5  c number(3),
  6  d number(38)
  7  );
Table created.
TEST> insert into test_number
  2  values
  3  (1,11,111,to_number(rpad('9',38,'9')));
1 row created.
TEST> insert into test_number
  2  values
  3  (1,1,11,to_number(rpad('9',15,'9')));
1 row created.
TEST> COMMIT;
Commit complete.
TEST> select vsize(A),vsize(B),vsize(C), vsize(D) from test_number;
  VSIZE(A)   VSIZE(B)   VSIZE(C)   VSIZE(D)
         2          2          3         20
         2          2          2          9
TEST> truncate table test_number;
Table truncated.
TEST> alter table test_number modify (D NUMBER(38,5));
Table altered.
TEST> insert into test_number
  2  values
  3  (1,11,111,to_number(rpad('9',33,'9')));
1 row created.
TEST> insert into test_number
  2  values
  3  (1,11,111,to_number(rpad('9',33,'9') || ',99'));
1 row created.
TEST> insert into test_number
  2  values
  3  (1,11,111,to_number(rpad('9',33,'9') || ',99999'));
1 row created.
TEST> COMMIT;
Commit complete.
TEST> select vsize(A),vsize(B),vsize(C), vsize(D) from test_number;
  VSIZE(A)   VSIZE(B)   VSIZE(C)   VSIZE(D)
         2          2          3         18
         2          2          3         19
         2          2          3         21Yoann.