Comment comprendre ce deadlock ?

alert:
Global Enqueue Services Deadlock detected. More info in file
/usr/local/oracle/product/10.2.0/db_1/admin/*MABASE*/bdump/*MABASE*_lmd0_11250.trc

*MABASE*_lmd0_11250.trc:
*** 2009-10-09 11:01:08.119
Global Wait-For-Graph(WFG) at ddTS[0.0] :
BLOCKED 0x28ac69530 5 [0x10001e][0x95119],[TX] [0] 1
BLOCKER 0x28ac693e0 5 [0x10001e][0x95119],[TX] [0] 1
BLOCKED 0x28ac69a88 5 [0xb0002][0x8f095],[TX] [0] 1
BLOCKER 0x28ac69920 5 [0xb0002][0x8f095],[TX] [0] 1
MERCI