Oracle-L: At the 4000 limit for LOBs in SQL

From: Connor McDonald <hamcdc_at_yahoo.co.uk>
Date: Mon, 25 Mar 2002 07:53:21 -0800
Message-ID: <F001.0043204F.20020325075321@fatcity.com>

Anyone seen behaviour like this before ?

rem
rem simple table
rem
SQL> create table blah (i number, x clob);

Table created.

rem
rem Add a row that I construct (i=1), and then rem insert a row from an existing table (which rem also contains a clob)
rem
SQL> declare
  2 r varchar2(32000) := rpad('*',20000,'*');   3 begin
  4 insert into blah values (1,r);
  5 insert into blah select 2,email
  6 from email_content where id = 418830;   7 commit;
  8 end;
  9 /

PL/SQL procedure successfully completed.

rem
rem So lengthwise the two lobs are similar rem
SQL> select i, dbms_lob.getlength(x) from blah;

I DBMS_LOB.GETLENGTH(X)

---------- ---------------------
         1                 20000
         2                 19743

rem
rem And the first lob looks fine...
rem
SQL> select dbms_lob.substr(x,3999,1)
2 from blah where i = 1;

DBMS_LOB.SUBSTR(X,3999,1)

...

rem
rem Whereas the second lob does not!
rem
SQL>
SQL> select dbms_lob.substr(x,3999,1)
2 from blah where i = 2;
select dbms_lob.substr(x,3999,1)

*
ERROR at line 1:
ORA-06502: PL/SQL: numeric or value error: character string buffer too small
ORA-06512: at line 1

Ideas anyone ?

Cheers
Connor

Connor McDonald
http://www.oracledba.co.uk (mirrored at http://www.oradba.freeserve.co.uk)

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Received on Mon Mar 25 2002 - 09:53:21 CST