This might be commonly used now a days. But, questions on this come up over and over still. So, trying to put few lines on that. Generally, the db2trc has a maximum buffer size of 128m and it can differ based on platforms/levels too. In certain platform and levels it cannot set to even 128m unless it's set before a db2start. Also, if a trace buffer is set to a smaller value ...
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buffer
db2
db2trc
db2trc_def_buffsize
db2luw