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Open APAR PM64226 describes an issue where catalog and directory LOB objects can grow considerably when a long READ claim is held on the object. The APAR refers specifically to DSNDB01.SYSDBDXA but goes on to say the problem can occur for other catalog and directory objects. You should track this APAR if you are already at DB2 10 NFM or are planning to move to NFM in the near to medium future.
The problem applies to both data sharing and non-data sharing systems, so all customers need to be vigilant.
PM64226 was open at the time of writing (27 June 2012)