We had an issue we just discovered that is very alarming. We lost about 2500 systems from out all systems collection. We know that on Saturday we were fine then by noon on Sunday all the systems were gone. We are running an AD Site Discovery now to find the machines and get the client installed again. My question is: 1. Where can I look to find where these machines either got removed on accident by OR the system dropped them 2. Anyone else had that happen?"You can't fix stupid!"

Hi, If clients has been deleted by maintenance task check smsdbmon.log on your site server. Do you run AD system discovery regulary ? did you configure heartbeat discovery? Julien

I guess those machines would not be sending the heartbeat and becoz of which the scheduled tasks would have deleted those.

We have our Heartbeat going once a week and AD Discovery going daily. We forced a discovery today and machines are coming back. Hoping the client comes back online properly which it should. smsdbmon.log didnt have anything it that looked like it removed 2500 machines. All looked about normal. Here is a sample from the log: RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [459 ][3F7FB9F5-EE7F-42CE-AE19-686A4657B18E] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:01:01 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [459 ][4AA9A420-0F74-468B-BF4E-F8F26AE2971E] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:01:01 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [459 ][FD648D45-E999-4053-9F4F-E232623FDEC6] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:01:01 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\459.CCN [3F7FB9F5-EE7F-42CE-AE19-686A4657B18E] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:01:01 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\459.CCN [4AA9A420-0F74-468B-BF4E-F8F26AE2971E] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:01:01 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\459.CCN [FD648D45-E999-4053-9F4F-E232623FDEC6] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:01:01 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [563 ][34FD1D77-C141-4AC5-B217-EB625CF53660] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:06:06 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [563 ][F78E8CF1-147C-410B-8751-7BD4FFED49F3] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:06:06 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [563 ][E8FACFD9-F6DC-4089-8D3E-4CD6C2384722] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:06:06 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\563.CCN [34FD1D77-C141-4AC5-B217-EB625CF53660] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:06:06 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\563.CCN [F78E8CF1-147C-410B-8751-7BD4FFED49F3] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:06:06 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\563.CCN [E8FACFD9-F6DC-4089-8D3E-4CD6C2384722] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:06:06 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [477 ][F1499D22-42A2-4536-99EE-9C13EDCDD5A7] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:15:06 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [477 ][92AC14CC-A123-4021-8453-3EC69B272094] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:15:06 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [477 ][72E5E487-1E88-449D-B63E-50516C6C7BEE] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:15:06 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [585 ][FFA98775-A88F-4EDD-A2CF-108F2AD995D2] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:15:06 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\477.CCN [F1499D22-42A2-4536-99EE-9C13EDCDD5A7] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:15:06 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\477.CCN [92AC14CC-A123-4021-8453-3EC69B272094] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:15:06 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\477.CCN [72E5E487-1E88-449D-B63E-50516C6C7BEE] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:15:06 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\585.CCN [FFA98775-A88F-4EDD-A2CF-108F2AD995D2] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:15:06 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [585 ][9FCF0359-E88D-4229-8BC0-DAE57845B534] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:15:16 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [585 ][BF40C3D2-0DA2-4392-930A-4EACFAF1739D] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:15:16 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\585.CCN [9FCF0359-E88D-4229-8BC0-DAE57845B534] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:15:16 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\585.CCN [BF40C3D2-0DA2-4392-930A-4EACFAF1739D] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:15:16 PM 28612 (0x6FC4) Task Monitor Keys is due at Monday 08/06/2012 00:00:00 SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:17:05 PM 34244 (0x85C4) Task Delete Aged Status Messages is due at Monday 08/06/2012 00:00:00 SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:17:05 PM 34244 (0x85C4) Task Summarize File Usage Metering Data is due at Monday 08/06/2012 00:00:00 SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:17:05 PM 34244 (0x85C4) Task Summarize Monthly Usage Metering Data is due at Monday 08/06/2012 00:00:00 SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:17:05 PM 34244 (0x85C4) Task Rebuild Indexes is due at Monday 08/06/2012 00:00:00 SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:17:05 PM 34244 (0x85C4) Task Delete Aged Metering Data is due at Monday 08/06/2012 00:00:00 SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:17:05 PM 34244 (0x85C4) Task Delete Aged Metering Summary Data is due at Monday 08/06/2012 00:00:00 SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:17:05 PM 34244 (0x85C4) Task Clear Undiscovered Clients is due at Monday 08/06/2012 00:00:00 SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:17:05 PM 34244 (0x85C4) Task Delete Obsolete Client Discovery Data is due at Monday 08/06/2012 00:00:00 SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:17:05 PM 34244 (0x85C4) Task Delete Aged Configuration Management Data is due at Monday 08/06/2012 00:00:00 SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:17:05 PM 34244 (0x85C4) Task Delete Aged Computer Association Data is due at Monday 08/06/2012 00:00:00 SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:17:05 PM 34244 (0x85C4) Task Delete Aged Delete Detection Data is due at Monday 08/06/2012 00:00:00 SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:17:05 PM 34244 (0x85C4) Task Reset AMT Computer Passwords is due at Monday 08/06/2012 00:00:00 SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:17:05 PM 34244 (0x85C4) Task Evaluate Provisioned AMT Computer Certificates is due at Monday 08/06/2012 00:00:00 SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:17:05 PM 34244 (0x85C4) Task Backup SMS Site Server is due at Monday 08/06/2012 00:00:00 SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:17:05 PM 34244 (0x85C4) Task Delete Aged Discovery Data is due at Monday 08/06/2012 00:00:00 SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:17:05 PM 34244 (0x85C4) Task Delete Aged Inventory History is due at Monday 08/06/2012 00:00:00 SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:17:05 PM 34244 (0x85C4) Task Delete Aged Collected Files is due at Monday 08/06/2012 00:00:00 SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:17:05 PM 34244 (0x85C4) Next time check will be at Sunday 08/05/2012 21:17:05 SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:17:05 PM 34244 (0x85C4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [578 ][81283502-79C1-43B5-BE1C-0741AEBB23E3] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:23:01 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\578.CCN [81283502-79C1-43B5-BE1C-0741AEBB23E3] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:23:01 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [578 ][38F97230-D976-49B3-BCCE-91F503A37E87] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:23:11 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [578 ][1F251983-3BF3-4E71-B604-BD73DE1E0789] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:23:11 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\578.CCN [38F97230-D976-49B3-BCCE-91F503A37E87] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:23:11 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\578.CCN [1F251983-3BF3-4E71-B604-BD73DE1E0789] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:23:11 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [687 ][41618A5F-9F03-43AF-A80D-0AD161B2DDAE] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:26:01 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [687 ][8DDC790A-F25E-4759-8F56-7D1A2D6EE7AA] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:26:01 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [687 ][5B3EB08C-D171-493C-8DEB-FA4B07E2983F] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:26:01 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\687.CCN [41618A5F-9F03-43AF-A80D-0AD161B2DDAE] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:26:01 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\687.CCN [8DDC790A-F25E-4759-8F56-7D1A2D6EE7AA] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:26:01 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\687.CCN [5B3EB08C-D171-493C-8DEB-FA4B07E2983F] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:26:01 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [859 ][72A1497B-175A-437B-B6A2-2139EE4031FC] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:33:07 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\859.CCN [72A1497B-175A-437B-B6A2-2139EE4031FC] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:33:07 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [859 ][E0AF4F65-E57B-4F10-8D7D-39526506278E] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:33:12 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [859 ][3447003C-3D6A-4C07-84F9-7EBCD564F656] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:33:12 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\859.CCN [E0AF4F65-E57B-4F10-8D7D-39526506278E] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:33:12 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\859.CCN [3447003C-3D6A-4C07-84F9-7EBCD564F656] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:33:12 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [527 ][FF7B80EC-4E5B-43F1-8341-FDB4EDD5B086] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:37:07 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\527.CCN [FF7B80EC-4E5B-43F1-8341-FDB4EDD5B086] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:37:07 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [527 ][E6ECDE52-1402-4332-9EA7-7B8871608724] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:37:12 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [527 ][9EE65A70-AD2B-4538-882C-35C70F3028A4] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:37:12 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\527.CCN [E6ECDE52-1402-4332-9EA7-7B8871608724] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:37:12 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\527.CCN [9EE65A70-AD2B-4538-882C-35C70F3028A4] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:37:12 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [562 ][A790899B-840E-4017-85EA-A7C7FF6F8090] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:45:07 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [562 ][1F08A0A8-AEAE-487D-84CC-134C8D3A4B3C] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:45:07 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [562 ][614CD7E0-9EA2-4499-8B0B-982753F42521] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:45:07 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\562.CCN [A790899B-840E-4017-85EA-A7C7FF6F8090] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:45:07 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\562.CCN [1F08A0A8-AEAE-487D-84CC-134C8D3A4B3C] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:45:07 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\562.CCN [614CD7E0-9EA2-4499-8B0B-982753F42521] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:45:07 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [507 ][83D56CD0-1E3D-49C5-A7C2-A36E8B82F348] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:49:02 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [507 ][807CB915-9640-431D-843D-1AED6534D197] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:49:02 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [507 ][C47787AE-1562-4E51-855D-90FB51BBA878] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:49:02 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\507.CCN [83D56CD0-1E3D-49C5-A7C2-A36E8B82F348] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:49:02 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\507.CCN [807CB915-9640-431D-843D-1AED6534D197] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:49:02 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\507.CCN [C47787AE-1562-4E51-855D-90FB51BBA878] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:49:02 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [551 ][CC87A0E3-F4B8-4E92-BB98-7E9FD6EA840E] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:52:07 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [551 ][1AE83A7A-6279-4FEE-8862-2DC279E662A8] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:52:07 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [551 ][3BB13D95-F81D-4DE5-AE5A-98740EFFA492] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:52:07 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\551.CCN [CC87A0E3-F4B8-4E92-BB98-7E9FD6EA840E] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:52:07 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\551.CCN [1AE83A7A-6279-4FEE-8862-2DC279E662A8] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:52:07 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\551.CCN [3BB13D95-F81D-4DE5-AE5A-98740EFFA492] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:52:07 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [582 ][3DE03704-01AC-43DF-A08B-F1DA55CCACA7] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:54:07 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\582.CCN [3DE03704-01AC-43DF-A08B-F1DA55CCACA7] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:54:07 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [582 ][F5124BDD-F613-4F3D-A980-0EBC50255046] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:54:17 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [582 ][2E03E4AC-2E45-462D-A943-D438A2836A99] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:54:17 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\582.CCN [F5124BDD-F613-4F3D-A980-0EBC50255046] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:54:17 PM 28612 (0x6FC4) SND: Dropped F:\Program Files\sms\inboxes\policypv.box\policytargeteval\582.CCN [2E03E4AC-2E45-462D-A943-D438A2836A99] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:54:17 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [750 ][64714A6C-6695-4492-A4B1-C72428E0715E] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:58:07 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [750 ][F10E19DD-7826-4E0E-A688-0CF3FA101CEB] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:58:07 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [750 ][D72647D8-5C8E-48B3-B63E-3ECB54E724AD] SMS_DATABASE_NOTIFICATION_MONITOR 8/5/2012 8:58:07 PM 28612 (0x6FC4) RCV: UPDATE on Collections for PolicyTargetEvalNotify_iud [751 "You can't fix stupid!"

Did you run the following status message query? Collection Member Resources Manually Deleted In your smssbmon.log or smsdbmonlog.lo_ , look for "CTriggerManager::ExecuteTask -" and check the task Delete Aged Discovery Data you should the number of row deleted if there are.

Check if a collection was deleted containing all these 2500 clients and someone accidentally selected DELETE COLLECTION MEMBERS while deleting the collection. This is the most common reason for admin deleting SCCM Computers or Users objectsSandeep C Learn more about IT @ schadda.blogspot.com Please mark this post as helpful if it was helpful :) Also mark it as a proposed answer if it turns out to be the final solution

The first thing we checked was to verify that it wasn't as simple as someone deleting a collection. All machines are back and running again after some aggressive discoveries but now its just rebuilding all the data. I will be opening up a case with MS to find a root cause but this was not as simple as a "someone deleted a collection""You can't fix stupid!"

A common culprit can be "Delete Special" in the right action pane in SCCM. Very easy to press this by mistake and deleting more than you want...Blog: www.danielclasson.com/blog | LinkedIn: Daniel Classon | Twitter: @danielclasson

The first thing we checked was to verify that it wasn't as simple as someone deleting a collection. All machines are back and running again after some aggressive discoveries but now its just rebuilding all the data. I will be opening up a case with MS to find a root cause but this was not as simple as a "someone deleted a collection" "You can't fix stupid!" I wonder do you have any down-level site servers? Are any Deletion requests coming from those sites? I've seen this occur, whereby an administrator deletes his Client records and the deletions are replicated up eventually. Is this a VM? Was the snapshot re-applied?