SWAP - ST02

Hi Gurus, I am doing daily monitoring for a server. Right in ST02 t-code i have some issue which i dont know how to resolve it.

One of the buffer which is Table Definition buffer directory is getting filled and increase day by day.

Buffer HitRatio % Alloc. KB Freesp. KB % Free Sp. Dir. Size FreeDirEnt % Free Dir Swaps DB Accs

Table definition 99.69 4,924 8 0.21 20,000 40 0.20 0 0 74,946

Day by day the directory size is just keep increasing. I dont have confident to tune-up the parameter setting in Production system. Even when i checked the Program buffer free directory size is 0.40% at the moment. I also have monitor that occuring in the program buffer day by day. From yesterday until today the swap that was occured was 24560 swaps. So i need your guideline what to do next in regards to this. I would sincerely appreciate your kind guidance and help.

Thank You.