Have you ever seen this error message on the Domino server console?

Error: “11/24/2006 10:51:05   Event: Error updating a Domino Domain Monitoring event document (NoteID 0xF2AA): Event correlation cache is full. You  can increase its size via the NOTES.INI setting  EVENT_CORRELATION_POOL_SIZE”

If so, then I assume you know that you can increase the cache size by adding the parameter


to the server’s notes.ini for a maximum cache size of 100MB.

But, surprise, surprise, the error will occur again. I opened a PMR today because I could not find any useful information on the web. Mateja Kozamernik from IBM support Slovenia pushed me into the right direction and sent me the information I needed.

“Even with the maximum configured pool size, you may still see the above error. This occurs because Domino creates cached documents that are 2MB in size and the server allows a maximum of 200 cached documents by default.

Since 2MB x 200 is greater than the maximum allowable pool size, the error can occur unless additional parameters are enacted to control the document size and/or the maximum number of cached documents. The following notes.ini parameters are available for these purposes.

DDM_MAX_NOTE_CACHE (number of documents in the cache)
DDM_MAX_DOCSIZE_MB (size in megabytes of documents in the cache)

To ensure that the Event Correlation cache will not be exhausted when configured to the maximum 100MB size, use these parameters so that the following formula is true:



  1. Hi, it is nice that this is available also in public technote.

    many cases I meet, are described in Private IBM technotes, it would be nice if after some HIT COUNT private technote, become public.

    BTW, Ulrich, What Gentlment NOTES.INI Settings set you use on your servers? can you share them with the community? I opened a topic on http://www.vlaad.lv so people could share their notes.ini settings.

  2. Hello Ulrich,

    I saw that you set here:

    A DDM_MAX_DOCSIZE_MB=2 … I´m currently playing with the best values and had a look into different ddm.nsf DBs. On more then 10 customer systems there was no document in the ddm.nsf which was bigger then 1MB. So I think it might be better to use a DDM_MAX_DOCSIZE_MB=1 as basis for the calculation from this notes.ini entry (instead DDM_MAX_DOCSIZE_MB=2).

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