Re: One more to the list of Myths exploded

unfortunately yes

Thanks to jared's example i have a clearer idea now :)

coz I am a
NoviceDBA
Oracle Certifiable DBBS

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Friday, September 28, 2001 3:00 PM

>
> Which myth did you have in mind ?
>
> I hadn't heard any that suggested that PL/SQL
> was particularly subtle or memory efficient.
>
> You're not associating this pl/sql implementation
> detail with the fact that a varchar2() column when
> stored in a datablock uses only the exact length
> required to store the current value, are you ?
>
>
> Jonathan Lewis
> http://www.jlcomp.demon.co.uk
>
> Host to The Co-Operative Oracle Users' FAQ
> http://www.jlcomp.demon.co.uk/faq/ind_faq.html
>
> Author of:
> Practical Oracle 8i: Building Efficient Databases
>
> Screen saver or Life saver: http://www.ud.com
> Use spare CPU to assist in cancer research.
>
>
> I was reading the Oracle PL/SQL manual and this is what I found. One
> more myth goes down
>
> The VARCHAR2 datatype involves a trade-off between memory use and
> efficiency. For a VARCHAR2(>= 2000) variable, PL/SQL dynamically
> allocates only enough memory to hold the actual value. However, for a
> VARCHAR2(< 2000) variable, PL/SQL preallocates enough memory to hold a
> maximum-size value. So, for example, if you assign the same 500-byte
> value to a VARCHAR2(2000) variable and to a VARCHAR2(1999) variable,
> the latter uses 1499 bytes more memory.
>
>
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Jonathan Lewis
> INET: jonathan_at_jlcomp.demon.co.uk
>
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Author: novicedba
  INET: novicedba_at_hotmail.com

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