Message-ID: <F001.005D3689.20031016133939@fatcity.com>
Date: Thu, 16 Oct 2003 13:39:39 -0800
To: Multiple recipients of list ORACLE-L <ORACLE-L@fatcity.com>
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From: Mladen Gogala <mladen@wangtrading.com>
Subject: Re: CLOB data
Organization: Fat City Network Services, San Diego, California
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This is because "ENABLE STORAGE IN ROW" is the default, which means
that oracle will store the first 4000 bytes in the original block.
The first part of a LOB is, essentially, identical to VARCHAR2(4000)
or VARRAW(4000). If you say something like

CREATE TABLE t
  (
    ISCT_ID              NUMBER(10),
    CONTENT              CLOB
  )
  TABLESPACE UNDOTBS
  LOB(CONTENT) STORE AS LOB_CONTENTS (
           TABLESPACE SYSTEM
           DISABLE STORAGE IN ROW
           NOCACHE
           LOGGING)
/

You will not be able to do that any longer. You cannot, however, exceed  
4000 characters (I'm not sure what happens if the characters are  
multibyte ones - may be Steve or Cary could help with that).


On 10/16/2003 04:54:26 PM, Nancy Hu wrote:
> I know Oracle provides us dbms_lob package to manipulate LOB data.   
> However, I can use standard DML to manipulate CLOB data as following.   
> Is there advantage to use dbms_lob package?
> 
> SQL> CREATE TABLE t
>  2  (
>  3    ISCT_ID              NUMBER(10),
>  4    CONTENT              CLOB
>  5  );
> 
> Table created.
> 
> SQL> insert into t values(1, 'test');
> 
> 1 row created.
> 
> SQL> insert into t values(2, NULL);
> 
> 1 row created.
> 
> SQL> update t set content='test2' where isct_id=2;
> 
> 1 row updated.
> 
> SQL> select * from t;
> 
>   ISCT_ID                             CONTENT
> -------------------------------------------------------
>         1                               test
> 
>         2                               test2
> 
> SQL>
> 
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>-- 
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
>-- 
> Author: Nancy Hu
>  INET: nancyhu68@hotmail.com
> 
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Mladen Gogala
Oracle DBA


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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Mladen Gogala
  INET: mladen@wangtrading.com

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
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