Oracle - Ora-01489: Result of String Concatenation Is Too Long

LISTAGG function: result of string concatenation is too long

Since the aggregates string can be longer than 4000 bytes, you can't use the LISTAGG function. You could potentially create a user-defined aggregate function that returns a CLOB rather than a VARCHAR2. There is an example of a user-defined aggregate that returns a CLOB in the original askTom discussion that Tim links to from that first discussion.

ORA-01489: result of string concatenation is too long 01489. 00000 - result of string concatenation is too long

One option would be to set the MAX_STRING_SIZE system variable to EXTENDED.
From the Oracle documentation:

Variable-length character string having maximum length size bytes or characters. You must specify size for VARCHAR2. Minimum size is 1 byte or 1 character. Maximum size is:

32767 bytes or characters if MAX_STRING_SIZE = EXTENDED

4000 bytes or characters if MAX_STRING_SIZE = STANDARD

So if your MAX_STRING_SIZE is currently set to STANDARD, then you will get the ORA-01489 error if your concatenated string exceeds 4000 bytes or characters. Here is how you can make the change:

ALTER SYSTEM SET MAX_STRING_SIZE = EXTENDED;

If your MAX_STRING_SIZE be already set to EXTENDED, then you will have to find another way to cope with such long strings.

Oracle - ORA-01489: result of string concatenation is too long

You are exceeding the SQL limit of 4000 bytes which applies to LISTAGG as well.

SQL> SELECT listagg(text, ',') WITHIN GROUP (
  2  ORDER BY NULL)
  3  FROM
  4    (SELECT to_char(to_date(level,'j'), 'jsp') text FROM dual CONNECT BY LEVEL < 250
  5    )
  6  /
SELECT listagg(text, ',') WITHIN GROUP (
*
ERROR at line 1:
ORA-01489: result of string concatenation is too long

As a workaround, you could use XMLAGG.

For example,

SQL> SET LONG 2000000
SQL> SET pagesize 50000
SQL> SELECT rtrim(xmlagg(XMLELEMENT(e,text,',').EXTRACT('//text()')
  2                     ).GetClobVal(),',') very_long_text
  3  FROM
  4    (SELECT to_char(to_date(level,'j'), 'jsp') text FROM dual CONNECT BY LEVEL < 250
  5    )
  6  /

VERY_LONG_TEXT
--------------------------------------------------------------------------------
one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen
,fifteen,sixteen,seventeen,eighteen,nineteen,twenty,twenty-one,twenty-two,twenty
-three,twenty-four,twenty-five,twenty-six,twenty-seven,twenty-eight,twenty-nine,
thirty,thirty-one,thirty-two,thirty-three,thirty-four,thirty-five,thirty-six,thi
rty-seven,thirty-eight,thirty-nine,forty,forty-one,forty-two,forty-three,forty-f
our,forty-five,forty-six,forty-seven,forty-eight,forty-nine,fifty,fifty-one,fift
y-two,fifty-three,fifty-four,fifty-five,fifty-six,fifty-seven,fifty-eight,fifty-
nine,sixty,sixty-one,sixty-two,sixty-three,sixty-four,sixty-five,sixty-six,sixty
-seven,sixty-eight,sixty-nine,seventy,seventy-one,seventy-two,seventy-three,seve
nty-four,seventy-five,seventy-six,seventy-seven,seventy-eight,seventy-nine,eight
y,eighty-one,eighty-two,eighty-three,eighty-four,eighty-five,eighty-six,eighty-s
even,eighty-eight,eighty-nine,ninety,ninety-one,ninety-two,ninety-three,ninety-f
our,ninety-five,ninety-six,ninety-seven,ninety-eight,ninety-nine,one hundred,one
 hundred one,one hundred two,one hundred three,one hundred four,one hundred five
,one hundred six,one hundred seven,one hundred eight,one hundred nine,one hundre
d ten,one hundred eleven,one hundred twelve,one hundred thirteen,one hundred fou
rteen,one hundred fifteen,one hundred sixteen,one hundred seventeen,one hundred
eighteen,one hundred nineteen,one hundred twenty,one hundred twenty-one,one hund
red twenty-two,one hundred twenty-three,one hundred twenty-four,one hundred twen
ty-five,one hundred twenty-six,one hundred twenty-seven,one hundred twenty-eight
,one hundred twenty-nine,one hundred thirty,one hundred thirty-one,one hundred t
hirty-two,one hundred thirty-three,one hundred thirty-four,one hundred thirty-fi
ve,one hundred thirty-six,one hundred thirty-seven,one hundred thirty-eight,one
hundred thirty-nine,one hundred forty,one hundred forty-one,one hundred forty-tw
o,one hundred forty-three,one hundred forty-four,one hundred forty-five,one hund
red forty-six,one hundred forty-seven,one hundred forty-eight,one hundred forty-
nine,one hundred fifty,one hundred fifty-one,one hundred fifty-two,one hundred f
ifty-three,one hundred fifty-four,one hundred fifty-five,one hundred fifty-six,o
ne hundred fifty-seven,one hundred fifty-eight,one hundred fifty-nine,one hundre
d sixty,one hundred sixty-one,one hundred sixty-two,one hundred sixty-three,one
hundred sixty-four,one hundred sixty-five,one hundred sixty-six,one hundred sixt
y-seven,one hundred sixty-eight,one hundred sixty-nine,one hundred seventy,one h
undred seventy-one,one hundred seventy-two,one hundred seventy-three,one hundred
 seventy-four,one hundred seventy-five,one hundred seventy-six,one hundred seven
ty-seven,one hundred seventy-eight,one hundred seventy-nine,one hundred eighty,o
ne hundred eighty-one,one hundred eighty-two,one hundred eighty-three,one hundre
d eighty-four,one hundred eighty-five,one hundred eighty-six,one hundred eighty-
seven,one hundred eighty-eight,one hundred eighty-nine,one hundred ninety,one hu
ndred ninety-one,one hundred ninety-two,one hundred ninety-three,one hundred nin
ety-four,one hundred ninety-five,one hundred ninety-six,one hundred ninety-seven
,one hundred ninety-eight,one hundred ninety-nine,two hundred,two hundred one,tw
o hundred two,two hundred three,two hundred four,two hundred five,two hundred si
x,two hundred seven,two hundred eight,two hundred nine,two hundred ten,two hundr
ed eleven,two hundred twelve,two hundred thirteen,two hundred fourteen,two hundr
ed fifteen,two hundred sixteen,two hundred seventeen,two hundred eighteen,two hu
ndred nineteen,two hundred twenty,two hundred twenty-one,two hundred twenty-two,
two hundred twenty-three,two hundred twenty-four,two hundred twenty-five,two hun
dred twenty-six,two hundred twenty-seven,two hundred twenty-eight,two hundred tw
enty-nine,two hundred thirty,two hundred thirty-one,two hundred thirty-two,two h
undred thirty-three,two hundred thirty-four,two hundred thirty-five,two hundred
thirty-six,two hundred thirty-seven,two hundred thirty-eight,two hundred thirty-
nine,two hundred forty,two hundred forty-one,two hundred forty-two,two hundred f
orty-three,two hundred forty-four,two hundred forty-five,two hundred forty-six,t
wo hundred forty-seven,two hundred forty-eight,two hundred forty-nine

---

If you want to concatenate multiple columns which itself have 4000 bytes, then you can concatenate the XMLAGG output of each column to avoid the SQL limit of 4000 bytes.

For example,

WITH DATA AS
  ( SELECT 1 id, rpad('a1',4000,'*') col1, rpad('b1',4000,'*') col2 FROM dual
  UNION
  SELECT 2 id, rpad('a2',4000,'*') col1, rpad('b2',4000,'*') col2 FROM dual
  )
SELECT ID,
       rtrim(xmlagg(XMLELEMENT(e,col1,',').EXTRACT('//text()') ).GetClobVal(), ',')
       || 
       rtrim(xmlagg(XMLELEMENT(e,col2,',').EXTRACT('//text()') ).GetClobVal(), ',') 
       AS very_long_text
FROM DATA
GROUP BY ID
ORDER BY ID;

LISTAGG function: Short string return ORA-01489: result of string concatenation is too long

It looks as if DISTINCT doesn't do what you hoped it would.

First select all distinct domains, then apply listagg to the result.

Simplified:

select listagg(domain, ',') within group (order by domain) final_result  --> 2. aggregation
from 
     (select distinct regexp_substr(email_string, ...) as domain         --> 1. distinct domains
      from email_parameter
     )

---

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