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Don Burleson Blog 







Delete shared memory segments in Windows

Oracle Database Tips by Donald BurlesonJanuary 1, 2015

Question:  I am getting the a shared memory segment exists error:

ORA-04031: unable to allocate string bytes of shared memory

My instance has crashed and I can see the shared memory segment RAM till exists

How to I remove RAM from the HEAP, in Windows?

Answer:  The difference between 32bit and 64bit Windows is obviously address space. The big thing to look out for here is that 32bit Windows limits you to 2GB for the SGA and ALL the other Oracle support jobs AND user jobs for an Oracle Instance.

If you are unaware of this on a 32-bit Oracle Windows Server and you attempt to increase the SGA beyond 2GB, you will get ORA-27102 out of memory errors.

If you can, the fastest and most reliable solution s to bounce the Windows server.  Otherwise, shared memory can be displayed and deleted in the Windows control panel. 

Also note that elderly 32-bit Windows is different from 64-bit Windows because you can address 2**64 bytes for RAM in 64-bit Windows..  In old 32-bit Windows you can only address 2**32 (about 3 gig) and you need AWE (address Window extension) or the 4GT tool.

Also see removing shared memory segments in UNIX/Linux.

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