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Summary of article content: Articles about ORA-01489 with listagg user_tables;. How to get around the 4,000 character limitation causing the ORA-01489? Answer: The ORA-01489 error is from using the listagg function. The … …
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Summary of article content: Articles about How to Fix “ORA-01489: Result of String Concatenation is too long” If you’re using the LISTAGG() function in Oracle, and you’ve encountered the error ORA-01489: result of string concatenation is too long … …
Most searched keywords: Whether you are looking for How to Fix “ORA-01489: Result of String Concatenation is too long” If you’re using the LISTAGG() function in Oracle, and you’ve encountered the error ORA-01489: result of string concatenation is too long … This article shows you how to work around the dreaded “ORA-01489: Result of String Concatenation is too long” error if you’re using LISTAGG.
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How to Fix “ORA-01489 Result of String Concatenation is Too Long”

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ORA-01489: result of string concatenation is too long

This question already has answers here: LISTAGG function: “result of string concatenation is too long” (12 answers) Closed 6 years ago .

Created one view within which one field(of 6) is a concatenation of two fields from the source table. Created a second view that uses listagg to potentially combine the results of the concatenation. Using this two step operation correctly returns the listagg concatenation of the two fields from the source table.

When I try to create one view that will both produce the concatenation and the listagg, I get the oracle error ora-01489 Result of string concatenation is too long.

As a test, I selected max(length(concatenated field) and that returned 837. So the stated error is in error, it seems.

So it must be in the syntax. I have tried rtrim, trim and even substr, but cannot get the view statement to both compile listagg(concatenation) and return data.

That I am able to develop the two views that correctly return the data suggests I have the basic syntax down, but the task of combining the concatenation with the listagg function I have not been able to figure out.

In a separate situation, I have been able to combine the concatenation with the listagg function in one statement:

LISTAGG (STATEMENTS || ‘ – ‘ || BIRTH_DATE, ‘; ‘) WITHIN GROUP (ORDER BY STATEMENTS || ‘ – ‘ || BIRTH_DATE) AS GROWING_UP

This syntax correctly returns the desired data………

But in the situation described above, similar syntax creates the Ora-01489 error.

Knowing that at times Oracle errors can be misleading, I am wondering if any onboard experts might know of any reason other than that stated that Oracle might throw this error?

LISTAGG ((NUMBER || ‘-‘ || text), ‘,’) WITHIN GROUP (ORDER BY (NUMBER || ‘-‘ || text)) AS restrictions FROM source

returns the error

ORA-01489 with listagg

Question: I run this SQL and get an ORA-01489 error:

SELECT

‘Existing Tables: ‘ || LISTAGG(table_name, ‘,’) WITHIN GROUP

(ORDER BY table_name) tablenames

FROM

user_tables;

How to get around the 4,000 character limitation causing the ORA-01489?

Answer: The ORA-01489 error is from using the listagg function.

The results of listagg are constrained to the max size of VARCHAR2(4000).

The oerr utility shows this for the ORA-01489 error:

ORA-01489: result of string concatenation is too long

Cause: String concatenation result is more than the maximum size.

Action: Make sure that the result is less than the maximum size.

Instead, use any of these solutions:

1 – xmlagg function

2 – You can also use the stragg function in lieu of listagg.

3 – And, of course, you can build your own PL/SQL concatenation function that returns type CLOB.

How to Fix “ORA-01489: Result of String Concatenation is too long”

If you’re using the LISTAGG() function in Oracle, and you’ve encountered the error ORA-01489: result of string concatenation is too long it’s because you’re trying to create a comma-delimited list that is too long for a VARCHAR2.

In Oracle, a VARCHAR2 column can contain at most 4000 characters. Some people might argue that this limit has changed in more recent versions of Oracle. But all Oracle did was use CLOB data types to store variables larger than 4000 characters under the hood. All of this is transparent to the user. Meaning it looks like you can have longer varchar2 values. But really, under the hood, it’s just a CLOB.

If you’re trying to create a list that is longer than 4000 characters, LISTAGG will give you the ORA-01489 error.

How to Fix “ORA-01489: Result of String Concatenation is Too Long”

How do you fix this? You use a function that returns a CLOB, rather than a VARCHAR2. If you were ambitious, you could write your own function. However, the simplest way to do it is to use XMLAGG.

Here’s an example of a query that fails, because the list is too long:

select listagg(object_name,’, ‘) within group (order by object_id) x from dba_objects where rownum <= 500; Here’s an equivalent version that uses XMLAGG() that works fine, because it returns a CLOB data type: select rtrim(xmlagg(xmlelement(e,object_name,', ').extract('//text()') order by object_id).getclobval(),', ') x from dba_objects where rownum <= 500 It’s a bit longer and not quite as pretty as listagg, but it’s easier than writing your own function. Again, you can create your own function if you want. It’s just not nearly as easy as this. Check out the Oracle Data Cartridge Developer’s Guide for information on how to make your own aggregate functions. To adapt the XMLAGG query for your own purposes: Change OBJECT_NAME to the column you wish to comma-delimit Modify OBJECT_ID to the expression you want to sort on. Also you’ll have to change ‘, ‘ to whatever you want to delimit your list with. Bear in mind that ‘, ‘ appears twice in the query above, so you’ll have to change it twice. Free Oracle SQL Tuning Guide Check out my FREE guide! 7 SQL Tuning Secrets You Can Use Immediately, Even If You’ve Never Tuned a Query In Your Life! Get it here: tuningsql.com/secrets

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Top 26 Ora 01489 The 10 Latest Answer

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ORA-01489 with listagg

How to Fix “ORA-01489: Result of String Concatenation is too long”

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ORA-01489: result of string concatenation is too long

ORA-01489: result of string concatenation is too long

ORA-01489 with listagg

How to Fix “ORA-01489: Result of String Concatenation is too long”

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