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Oracle.exe Leaks Mutex Handles And Memory Size Increases In Windows And Above (Doc ID 2251486.1)

Last updated on FEBRUARY 15, 2019

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 11.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Microsoft Windows x64 (64-bit)


Oracle.exe process on Windows platform increases its memory usage if Windows bundle patch and above is installed.
Using an utility like handle.exe, oracle.exe process leaks Mutex (Mutant) handles and memory usage increases due to these handles.

Output of handle.exe program
Handle type summary:
ALPC Port : 5
Desktop : 1
Directory : 2
EtwRegistration : 28
Event : 116
File : 222
IoCompletion : 3
Key : 10
KeyedEvent : 1
Mutant : 80035 <==
Section : 32
Semaphore : 29
Thread : 76
Timer : 3
TpWorkerFactory : 2
WindowStation : 2
Total handles: 80567

This is related to the number of dblink connections made in this instance. Each time dblink operation like the following is executed, Mutex handle count in oracle.exe process increases.

SQL> select * from <TABLE_NAME>@<DB_LINK_NAME>;
SQL> exit


Reproduce with Windows bundle patch between and


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