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Failure to calculate super-latch promotion threshold


Failure to calculate super-latch promotion threshold

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JohnnyDBA
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I saw this error message in the error log of one of my SQL Server 2008 R2 servers today (with SP2 installed, v10.50.4000).

"Warning: Failure to calculate super-latch promotion threshold."

I've never seen that message, can't find anything online about it, and don't know what the impact is.

The only other relevant information I can give is that there was a series of DBCC CHECKDB commands occurring at the time (our nightly database checks).

Any additional information would be appreciated.

Thanks,

John
anthony.green
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what is the error number, state and severity from the error log?



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JohnnyDBA
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None, I copied and pasted the message exactly as it was in the log.
anthony.green
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Nothing directly underneath that line, which looks something like

Error: ####, Serverity: ##, State: ##.

Usually they span two lines

Login failed for user 'someuser'. Reason: Failed to open the explicitly specified database. [CLIENT: 192.168.0.1]
Error: 18456, Severity: 14, State: 38.





How to post data/code for the best help - Jeff Moden
Need a string splitter, try this - Jeff Moden
How to post performance problems - Gail Shaw
Managing Transaction Logs - Gail Shaw
Troubleshooting SQL Server: A Guide for the Accidental DBA - Jonathan Kehayias and Ted Krueger


JohnnyDBA
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This is exactly how it came in (with the exception of me renaming actual application DBs to DB1, DB2, etc...)



2012-09-18 00:00:47.870 spid20s This instance of SQL Server has been using a process ID of 15280 since 8/7/2012 2:08:02 PM (local) 8/7/2012 6:08:02 PM (UTC). This is an informational message only; no user action is required.
2012-09-18 01:00:01.990 spid59 DBCC CHECKDB (master) WITH all_errormsgs, no_infomsgs executed by PROD\devsvc found 0 errors and repaired 0 errors. Elapsed time: 0 hours 0 minutes 1 seconds. Internal database snapshot has split point LSN = 0000029a:0000003c:0002 and first LSN = 0000029a:0000003b:0001.
2012-09-18 01:00:12.880 spid59 DBCC CHECKDB (mssqlsystemresource) WITH all_errormsgs, no_infomsgs executed by PROD\devsvc found 0 errors and repaired 0 errors. Elapsed time: 0 hours 0 minutes 10 seconds.
2012-09-18 01:00:15.450 spid59 DBCC CHECKDB (model) WITH all_errormsgs, no_infomsgs executed by PROD\devsvc found 0 errors and repaired 0 errors. Elapsed time: 0 hours 0 minutes 2 seconds. Internal database snapshot has split point LSN = 00000016:00000085:0001 and first LSN = 00000016:00000084:0001.
2012-09-18 01:00:40.880 spid59 DBCC CHECKDB (msdb) WITH all_errormsgs, no_infomsgs executed by PROD\devsvc found 0 errors and repaired 0 errors. Elapsed time: 0 hours 0 minutes 25 seconds. Internal database snapshot has split point LSN = 0000a065:000000dc:0001 and first LSN = 0000a065:000000db:0001.
2012-09-18 01:00:42.240 spid59 DBCC CHECKDB (ReportServer) WITH all_errormsgs, no_infomsgs executed by PROD\devsvc found 0 errors and repaired 0 errors. Elapsed time: 0 hours 0 minutes 1 seconds. Internal database snapshot has split point LSN = 0000003a:00000165:0001 and first LSN = 0000003a:00000164:0001.
2012-09-18 01:00:42.770 spid59 DBCC CHECKDB (ReportServerTempDB) WITH all_errormsgs, no_infomsgs executed by PROD\devsvc found 0 errors and repaired 0 errors. Elapsed time: 0 hours 0 minutes 0 seconds. Internal database snapshot has split point LSN = 00000018:0000010f:0001 and first LSN = 00000018:0000010e:0001.
2012-09-18 02:07:39.340 spid4s Warning: Failure to calculate super-latch promotion threshold.
2012-09-18 02:11:06.130 spid59 DBCC CHECKDB (DB1) WITH all_errormsgs, no_infomsgs executed by PROD\devsvc found 0 errors and repaired 0 errors. Elapsed time: 1 hours 10 minutes 23 seconds. Internal database snapshot has split point LSN = 00199f9b:000000c8:0001 and first LSN = 00199f9b:000000c7:0001.
2012-09-18 02:46:22.320 spid59 DBCC CHECKDB (DB2) WITH all_errormsgs, no_infomsgs executed by PROD\devsvc found 0 errors and repaired 0 errors. Elapsed time: 0 hours 35 minutes 13 seconds. Internal database snapshot has split point LSN = 0032527a:0000102f:0001 and first LSN = 0032527a:0000102e:0001.
2012-09-18 02:48:16.720 spid59 DBCC CHECKDB (DB3) WITH all_errormsgs, no_infomsgs executed by PROD\devsvc found 0 errors and repaired 0 errors. Elapsed time: 0 hours 1 minutes 53 seconds. Internal database snapshot has split point LSN = 0005e0b7:000003f8:0001 and first LSN = 0005e0b7:000003f7:0001.
2012-09-18 03:20:06.140 spid59 DBCC CHECKDB (DB4) WITH all_errormsgs, no_infomsgs executed by PROD\devsvc found 0 errors and repaired 0 errors. Elapsed time: 0 hours 31 minutes 48 seconds. Internal database snapshot has split point LSN = 001422e6:0000c241:0001 and first LSN = 001422e6:0000c240:0001.
2012-09-18 03:56:48.510 spid59 DBCC CHECKDB (DB5) WITH all_errormsgs, no_infomsgs executed by PROD\devsvc found 0 errors and repaired 0 errors. Elapsed time: 0 hours 36 minutes 41 seconds. Internal database snapshot has split point LSN = 000add1e:000022a1:0001 and first LSN = 000add1e:000022a0:0001.
2012-09-18 03:58:21.960 spid59 DBCC CHECKDB (DB6) WITH all_errormsgs, no_infomsgs executed by PROD\devsvc found 0 errors and repaired 0 errors. Elapsed time: 0 hours 1 minutes 32 seconds. Internal database snapshot has split point LSN = 0047c74c:000000fd:0001 and first LSN = 0047c74c:000000fc:0001.
2012-09-18 04:08:54.060 spid59 DBCC CHECKDB (DB7) WITH all_errormsgs, no_infomsgs executed by PROD\devsvc found 0 errors and repaired 0 errors. Elapsed time: 0 hours 10 minutes 31 seconds. Internal database snapshot has split point LSN = 0031884b:000000d6:0001 and first LSN = 0031884b:000000d5:0001.
2012-09-18 04:08:55.510 spid59 DBCC CHECKDB (DB8) WITH all_errormsgs, no_infomsgs executed by PROD\devsvc found 0 errors and repaired 0 errors. Elapsed time: 0 hours 0 minutes 0 seconds. Internal database snapshot has split point LSN = 0000005d:0000017f:0001 and first LSN = 0000005d:0000017e:0001.

anthony.green
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Thanks for that, I was thinking it was a user invoked error message as I couldnt find an article on it after a Google.

One for some reading up on I think, found this on how it works but nothing yet relating to the error
http://blogs.msdn.com/b/psssql/archive/2009/01/28/hot-it-works-sql-server-superlatch-ing-sub-latches.aspx



How to post data/code for the best help - Jeff Moden
Need a string splitter, try this - Jeff Moden
How to post performance problems - Gail Shaw
Managing Transaction Logs - Gail Shaw
Troubleshooting SQL Server: A Guide for the Accidental DBA - Jonathan Kehayias and Ted Krueger


JohnnyDBA
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Thanks for that. I guess I can chalk this up to some kind of disk latency issue?
HowardW
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Given that there's not a single occurrence of this error referenced on Google, I'd assume you're hitting a very unusual condition. It sounds relatively innocuous (the error log does record some irrelevant warnings at times), but you might want to log a call with MS Support to get some more information if it's an important production server.
erik.t.nielsen
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I have this warning about 10 times since I installed SP2 on SQL 2008 R2 on October 21st - I am investigating the problem.
Tim-690839
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We also started getting this error immediately after installing SP2 on our 2008 R2 instance.
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