Error 823 Io Error 23
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Paul Randal Posted on: February 23, 2009 10:15 am There are two pretty well-known I/O errors - 823,
Sql Server Alerts For 823 824 And 825 Errors
and 824 - but there's also one called 825 which most DBAs sql server error 823 do*not* know about, and definitely should. From SQL Server 2005 onwards, if you ever see an 823 sql server error 824 or 824, SQL Server has actually tried that I/O a total of 4 times before it finally declares a lost cause and surfaces the high-severity I/O error to
Error Number 825
the connection's console, killing the connection into the bargain. The idea behind this read-retry logic came from Exchange, where adding the logic reduced the amount of immediate downtime that customers experienced. While in concept this was something I agreed with at the time, I didn't agree with the way it was implemented. If the I/O continues to fail,
Sql Server Error 21
then the 823/824 is surfaced - that's fine. But what if the I/O succeeds on one of the retries? No high-severity error is raised, and the query completes, blissfully unaware that anything untoward happened. However, something *did* go badly wrong - the I/O subsystem failed to read 8KB of data correctly until the read was attempted again. Basically, the I/O subsystem had a problem, which luckily wasn't fatal *this time*. And that's what I don't like - the I/O subsystem went wrong but there are no flashing lights and alarm bells that fire for the DBA, as with an 823 or 824. If read-retry is required to get a read to complete, the only notification of this is a severity-10 informational message in the error log - error 825. It looks like this: Msg 825, Level 10, State 2, Line 1. A read of the file ‘D:\SQLskills\TestReadRetry.mdf’ at offset 0×0000017653C000 succeeded after failing2 time(s) with error: incorrect checksum (expected: 0×4a224f20; actual: 0×2216ee12). Additional messages in the SQL Server error l
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Sql Server Error Number 824
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be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. Results 1 to 12 of 12 Thread: MS SQL Error 823 I/O Error Tweet Thread Tools Show Printable Version Subscribe to this Thread… Search Thread Advanced Search Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode 09-03-03,12:15 #1 daveloh View Profile View Forum Posts Visit Homepage Registered User Join Date Sep 2003 Posts 3 Unanswered: MS SQL Error 823 I/O Error Hi there, I am reinstall my OS (Win2k Server) and try to attach back my database to SQL Server (MS SQL 2000). After selecting MDF and LDF file. It come out with all those message below in my event viwer. And attach database action is fail. I had check with Microsoft and download the latest Server Pack 3, but still nothing is change. I am panic here. Can any one help me to solve this problem. Your help is very much appreciated. Thank you. Dave Message copy from Event Viwer. 17052 : Device activation error. The physical file name 'C:\Program Files\Microsoft SQL Server\MSSQL\data\ultra_Log.LDF' may be incorrect. Error: 823, Severity: 24, State: 6 I/O error (torn page) detected during read at offset 0000000000000000 in file 'C:\Program Files\Microsoft SQL Server\MSSQL\Data\ultra_Log.LDF'. 17207 : udopen: Operating system error 5(error not found) during the creation/opening of physical device C:\Program Files\Microsoft SQL Server\MSSQL\data\ultra_Data.MDF. 17204 : FCB::Open failed: Could not open device C:\Program Files\Microsoft SQL Server\MSSQL\data\ultra_Data.MDF for virtual device number (VDN) 1. 17052 : Device activation error. The physical file name 'C:\Program Files\Microsoft SQL Server\MSSQL\data\ultra_Data.MDF' may be incorrect. Reply With Quote 09-03-03,12:58 #2 MCrowley View Profile View Forum Posts Registered User Join Date Jan 2003 Location Massachusetts Posts 5,794 Provided Answers: 11 Judging from the error messages, are you certain you have the files in the correct path? Just trying to eliminate the obvious, here. Reply With Quote 09-03-03,13:15 #3 daveloh View Profile View Forum Posts Visit Homepage Registered User Join Date Sep 2003 Posts 3 Originally posted by MCrowley Judging from the error messages, are you certain you have the files in the correct path? Just trying to eliminate the obvious, here. Well.....i just copy back the file to C:\Program Files\Microsoft SQL Serve