This DB2 Error occurs when attempting to run a large report or during a search of the content store.

CM-SYS-5092 Content Manager failed while returning the query results.
[IBM][CLI Driver][DB2/6000] SQL0101N The statement is too long or too complex. SQLSTATE=54001

This is an known issue with the heap size for DB2. To update the heap size.
Steps:

The following is an extract from DB2 documentation:
SQL0101N The statement is too long or too complex.
Explanation: The statement could not be processed because it exceeds a system limit for either length or complexity, or because too many constraints or triggers are involved. The default statement heap size for DB2 is too small to support the complex SQL statements. Try updating the statement heap size to be 8000 or more. To update the heap size, open a DB2 command prompt and type the following: > db2 update db cfg for <database name> using stmtheap 8000