Re: CLOB data

From: Mladen Gogala <mladen_at_wangtrading.com>
Date: Thu, 16 Oct 2003 13:39:39 -0800
Message-ID: <F001.005D3689.20031016133939@fatcity.com>

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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> Author: Nancy Hu
> INET: nancyhu68_at_hotmail.com
>
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Mladen Gogala
Oracle DBA

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-- 
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-- 
Author: Mladen Gogala
  INET: mladen_at_wangtrading.com

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Received on Thu Oct 16 2003 - 16:39:39 CDT