System objects affected by locks

respected forum members,
as we know that user objects such as tables and rows are affected by locks.
system objects which are not visible to users such as shared data structures how they are ffected by locks and what
type of locks are acquired on these objects
plz reply bit in detail..............?
regards

system objects which are not visible to users such as shared data structures how they are ffected by locks and what The shared memory structures contain the resources which are locked for exclusive access. These resources and their access is protected by low level locks aka Latches. Latches protect the access of the resource as well as take care that who has got the next wait on the same resource. For example, there may be locks in the library cache's shared cursors btu those locks won't be visible from the normal views.
Here is a list of the lock modes that can be acquired ,
http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/dynviews_1147.htm#sthref2582
HTH
Aman....

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