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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Riddle me this Oracle riddle...
Thanks for finding this.... I had searched high and low and somehow missed
this reference.
This doesn't quite jive with what Oracle has told me, so I'm following up for more detail from them.
RF
Robert G. Freeman - Oracle8i OCP
Oracle DBA Technical Lead
CSX Midtier Database Administration
The Cigarette Smoking Man: Anyone who can appease a man's conscience can take his freedom away from him.
-----Original Message-----
Sent: Wednesday, March 06, 2002 4:47 PM
To: Multiple recipients of list ORACLE-L
Hi listers,
continuing on varchar2 memory cost in PL/SQL, note this found in Oracle 8i/9i PL/SQL user guide : (Chapter 3 PL/SQL Datatypes - Character types - Varchar2)
"Small VARCHAR2 variables are optimized for performance,
and larger ones are optimized for efficient memory use.
The cutoff point is 2000 bytes. For a VARCHAR2 that is 2000 bytes
or longer, PL/SQL dynamically allocates only enough memory
to hold the actual value. For a VARCHAR2 variable that is
shorter than 2000 bytes, PL/SQL preallocates the full declared length
of the variable. For example,
if you assign the same 500-byte value to a VARCHAR2(2000 BYTE)
variable and to a VARCHAR2(1999 BYTE) variable, the former
takes up 500 bytes and the latter takes up 1999 bytes. "
HTH Regards
Gilles Parc
carpe diem !!
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Author: Gilles PARC
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Author: Freeman, Robert
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