Why oracle stores no length for CHAR, VARCHAR2, and other types?

Hi friends,

I was reading a book by Tom Kyte on the types of character data.
+For character strings,Oracle will have a leading length field of 1 to 3 bytes, or when they are NULL they+ 
+will be represented by a single byte value of 0xFE.+
+If the length of the string is less than or equal to 250, Oracle will use 1 byte for the length.+
+All strings exceeding 250 bytes will have a flag byte of 0xFE followed by 2 bytes that represent the length.+
Can someone explain please why Oracle shops length here and where exactly is - it used by Oracle?
For strings longer than 250 bytes, it sets a flag to 0xFE byte. What is the usefulness of this indicator byte and how is it useful?
Is there anyway we can see the length bytes that are stored by Oracle? I tried with the DUMP function, but it is to show that the value of the length, but not the bytes it stores for her.

Kind regards
Anthony

I think that Oracle chose 0xFF to represent a null value
(a) Yes
(b) should be 1 as another column can follow

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Etbin

Tags: Database

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