Strange Client Behavior after upgrading to 10g

Question

Hello Friends !!!!
Here is my scenario:
Oracle Database 10g 10.2.0.3
Windows 2008 Server SP2
After upgrading from oracle 9.2.0.1.0 and Windows 2003 Server I'm facing a strange behavior.
Many times over the days some machines do not release some table resources even having their status "INACTIVE" and the wait event "SQL *Net message from client" and wait class "IDLE".
Therefore, i got a lot of locked sessions, and users complaining..... until I kill them
The client machine was as well switched to Oracle 10g client....
Have you guys got any tips about this scenario?
Tks for any advice.

Answer 1

About the lock queue:
1. blocking session has an exclusive table lock on VENDEDORES table; this is very rare in application because most of the time not needed: application code should try to avoid to take such kind of lock.
2. blocked sessions request a row share table lock: it looks like that VENDEDORES table is a child table linked to some parent table with a foreign key constraint and that an index on the child table foreign key is missing (this kind of lock is requested if you DELETE from parent table or update parent table primary key).
About the lock session: this is the blocking session that is waiting since 19 seconds on client: it is likely an application issue: you should try to investigate what the client (aservice.exe) is doing while holding an exclusive table lock.