This Oracle tutorial explains how to use the Oracle/PLSQL function.
The Oracle/PLSQL LENGTHB function calculates the length of a string using bytes not characters.
The syntax for the Oracle/PLSQL LENGTHB function is:
LENGTHB( string1 )
string1 is the string to do the calculation.
string1 can be CHAR, VARCHAR2, NCHAR, NVARCHAR2, or single-byte LOB.
If string1 is NULL, LENGTHB returns NULL.
LENGTHB(NULL) ------------- NULL LENGTHB('') ------------ NULL LENGTHB(' ') ------------ 1 LENGTHB('java2s.com') --------------------- 16