search listings: varchar2 compared to the number

I'm just getting started with Oracle and noticed the fields numbers, even number (1) or number (2), require a LOT of memory (22 bytes, this is what always comes to me in 10g XE). VARCHAR2 fields, however, seem to require bytes as well as the length of the field (5 bytes for varchar2 (5), etc.).

So, I guess this is advantageous in Oracle use varchar2 fields rather than numbers in the search field when you have relatively low search lists.

Hello
Numbers in Oracle are not such as integer or long in a programming language, but they certainly do not always take 22 bytes.
You can read how the numbers are stored in metalink Note 1007641.6. In general, Oracle uses a byte for exhibitor, the rest are in base 100.

You can also check the actual size and data using the functions vsize and dump (but first read the note):

SQL> select vsize(1) from dual;

  VSIZE(1)
----------
         2

SQL> select dump(1) from dual;

DUMP(1)
------------------
Typ=2 Len=2: 193,2

SQL> select vsize(121) from dual;

VSIZE(121)
----------
         3

SQL> select dump(121) from dual;

DUMP(121)
---------------------
Typ=2 Len=3: 194,2,22

HTH
Liron Amitzi
Consultant senior s/n
[www.dbsnaps.com]
[www.orbiumsoftware.com]

Tags: Database

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