ORA-01450: maximum key length (3215) exceeded

A client is trying to rebuild an index online with the following errors:

SQL> alter index indx_cdr rebuild online;
alter index IDX_CDR rebuild online
ERROR at line 1:
ORA-00604: error occurred at recursive SQL level 1
ORA-01450: maximum key length (3215) exceeded

SQL> select max(length( call_message)) from  cdr;



Build the index without ONLINE option:

SQL> alter index indx_cdr rebuild;

Index altered.

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