How do I know the size specific to a field in an oracle table

Hello

Oracle 11.2.0.3 on redhat
I have three tables with the same structure, table0, table50, table100:

create table table0 (ID options, shipping RAW (2000), RAW (2000));

I inserted some 10000 lines each, but with a few differences:
Table0 a 10000 id, but shipping and options has null values
table50 has 10000 id, but shipping and options has only 5000 lines, the other 5000 are null values
table100 has 10000 lines of id, shipping and options. No null values.

I want to know the specific size of each column, also the size of each line, namely the exactly size of the field.

for example:

rank 1, the column of table100 options is "asdfasdfagasdgasbabsdgoasdpgiahnwe1129u412094u12".
rank 2, the table100 column options is "a".
both are given in raw format, but I think that its space will be a different size (bytes), how do you know? any question?

I found this query:
select owner,tablespace_name,segment_name,sum((bytes/1024/1024)) Bytes
from sys.dba_extents
where owner in 'MAA' and segment_type='TABLE' and segment_name ='TABLE00'
group by tablespace_name,owner,segment_name
order by owner,tablespace_name,segment_name, bytes;
but I think that is not my solution.

If VSIZE returns a constant value, which allows to conclude that everything which is inserting the data in your table is always inserting a constant number of bytes.

If I create a table with a RAW (1000) and insert data with different sizes of binary, VSIZE gives different results

SQL> create table foo(
  2    col1 raw(1000)
  3  );

Table created.

SQL> insert into foo values( utl_raw.cast_from_number(12) );

1 row created.

SQL> insert into foo values( utl_i18n.string_to_raw('This could be a much longer string') );

1 row created.

SQL> select vsize(col1) from foo;

VSIZE(COL1)
-----------
          2
         34

If you say VSIZE always returns the value 1000, which implies that everything what is the insertion of the data is always inserting 1000 bytes of data.

Justin

Tags: Database

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