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Don Burleson Blog 







ORA-01489 with listagg

Oracle Database Tips by Donald BurlesonJuly 30, 2015

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

   'Existing Tables: ' || LISTAGG(table_name, ',') WITHIN GROUP
   (ORDER BY table_name) tablenames

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.

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