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PODisposing of Notes Objects with COM, Memory Leaks
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copied!<p>I using C# to interact with the Domino COM. I am using Lotus Notes 8.5.2. Visual Studio 2008, Windows 7 SP1. </p> <p>I am trying to prevent this error from Lotus:</p> <pre><code>LSXBE: ************************************ LSXBE: ****** Out of Backend Memory ******* LSXBE: ************************************ </code></pre> <p>The following code copies each NotesDocument in an NSF to another NSF. After getting UNIDs from a NotesView having a selection query of SELECT @All, code copies one message at a time using </p> <pre><code>NotesDocument ndoc = nd.GetDocumentByUNID(nve.UniversalID); ndoc.CopyToDatabase(nd2); </code></pre> <p>Given, a source NSF of 10 GB, the amount of memory (private bytes, I believe) used by my application grows steadily to about 450 MB. ANTS Memory Profiler indicates that almost all of that memory is allocated to unmanaged memory, which would be the COM.</p> <ol> <li>Could I reduce memory consumption by disposing of Notes objects? I have not seen methods to deallocate a NotesSession, NotesDatabase, NotesDocument, etc. Is there a way to deallocate the memory? </li> </ol> <p>I have tried a version of the code calling GC.Collect() and GC.WaitForPendingFinalizers() after every 5000 documents, that eliminated the "Out of Backend Memory" errors on a machine with 16 GB RAM. Even when copying finishes, and I set the object containing the below code to null and call garbage collection, memory utilization remains around 450 MB.</p> <p>I also tried putting the copy code in its own thread and then garbage collecting after the thread completes. That did not help.</p> <ol> <li>If there are not disposal methods for Notes objects, how else might I reduce memory utilization?</li> </ol> <p>Code C#</p> <pre><code>//Establish session NotesSession ns = new Domino.NotesSessionClass(); ns.Initialize(""); //Open source NSF NotesDatabase nd = ns.GetDatabase("", "test.nsf", false); //Open destination NSF. //Assume that all design elements of nd2 are identical to those of nd NotesDatabase nd2 = ns.GetDatabase("", "test2.nsf", false); //Create view that returns all documents. NotesView nView2 = nd.GetView("$All"); nd.CreateView("All-DR", "SELECT @ALL", nView2, false); NotesView nView = NotesConnectionDatabase.GetView("All-DR"); //Loop through entries in the new view NotesViewEntry nvec = nView.AllEntries; nve = nvec.GetFirstEntry(); for (int j = 1; j <= intEntryCount; j++) { if (j == 1) { nve = nvec.GetFirstEntry(); } else { nve = nvec.GetNextEntry(nve); } //Copy document to second database. NotesDocument ndoc = nd.GetDocumentByUNID(nve.UniversalID); ndoc.CopyToDatabase(nd2); } //End loop. //All documents are copied. </code></pre> <p>I have these ideas, none of which is appealing:</p> <ol> <li><p>Call garbage collection after every call to CopyToDatabase. I don't expect this will work given that I believe I am dealing with a memory leak in COM. I also expect it to reduce the speed of my application.</p></li> <li><p>Try the C++ API. I have no idea whether the issue exists there.</p></li> <li><p>This is a really clumsy way... Build a new manager app that a. Gets a list UNIDs and writes them to a text file. b. Starts the copy app. c. The copy app copies a subset of the records from the text file. d. The copy app terminates, freeing its memory. e. The manager app starts a new copy app process. f. Repeat c - e as needed.</p></li> </ol>

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