Streams AQ: enqueue blocked on low memory

Single instance
Standard 10.2.0.1.0
Win 2k3 32 bit.
For the past 2 hours, there are spikes of dark brown (Configuration) on the Performance screen in EM every 5 minutes. When I click on Top Activity, I can see that the session belongs to SYS and Program is ORACLE.EXE (MMON). When I click on SQL ID, Information has "The SQL statement is not available" but on the Details - Activity tab, I see "Streams AQ: enqueue blocked on low memory".
As far as I know, the db is set to auto memory management and we just set the SGA max size. And we haven't changed any parameters recently.
Is it a problem? If so, what should I check next?
Thanks.

MMON is a [url http://docs.oracle.com/cd/B19306_01/server.102/b14220/process.htm#sthref1626]background process that performs manageability tasks. It was new in your patch level, so it might have bugs. Actually, no "might" to it. Any bugs with this process are ironic, since there is self-referential humor in a monitoring process that doesn't work right, especially if it is causing problems monitoring itself.
So:
Look in your background dump destination for trace files with names like m*m0*.trc. Look in your alert log for error messages. Patch up to the latest patch level.
You don't see the SQL information because the process runs periodically and doesn't happen to be one that is reused well. I take it you don't have a streams pool defined in your init.ora, which means the shared pool is being used for some streams thing. so this may be an indication you are having shared pool memory pressure.
Does simply rebooting (or bouncing Oracle) help? Some platforms have memory leak issues with MMON, so after some period of time you might see this, just because.

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