Error 825
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Sql Server Alerts For 823 824 And 825 Errors
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Paul Randal Posted on: February 23, 2009 10:15 am There are two pretty well-known I/O errors - 823, and 824 - but there's also one sql error 823 called 825 which most DBAs do*not* know about, and definitely should. From SQL
Sql Server Error Number 824
Server 2005 onwards, if you ever see an 823 or 824, SQL Server has actually tried that I/O a total
Sql Server Alert Error 825
of 4 times before it finally declares a lost cause and surfaces the high-severity I/O error to the connection's console, killing the connection into the bargain. The idea behind this read-retry logic https://support.microsoft.com/en-us/kb/2015757 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, then the 823/824 is surfaced - that's fine. But what if the I/O succeeds on one of the retries? No high-severity http://www.sqlskills.com/blogs/paul/a-little-known-sign-of-impending-doom-error-825/ 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 log and system event log may provide more detail. This error condition threatens database integrity and must be corrected. Complete a full database consistency check (DBCC CHECKDB). This error can be caused by many factors; for more information, see SQL Server Books Online. Now,
Your Twitter Handle About Us SSG Team Join Us Authors Speakers Blog With Us Write a Guest Post Testimonials Contact Us Subscribe to our Newsletter Blogs All http://www.sqlservergeeks.com/sql-server-error-825-read-retry/ Blog Posts One DMV a Day Series Accidental DBA Series One Operator a Day Series One Trace Flag a Day Series Videos Events PodCasts Newsletters Resources Social Twitter Facebook Page Facebook Group RSS http://productforums.google.com/d/topic/gmail/3k5vop3AzL0 YouTube LinkedIn Google+ Submit Your Twitter Handle About Us SSG Team Join Us Authors Speakers Blog With Us Write a Guest Post Testimonials Contact Us Subscribe to our Newsletter SQL Server error 825, sql server Read Retry HomeDatabase EngineCorruptionSQL Server error 825, Read Retry Previous Next SQL Server error 825, Read Retry Dear Friends, There are different scenarios where read operation fails in first attempt and when retried gets successful may be in second, third or even fourth attempt. SQL Server development team adopted this strategy and any read failure 823 or 824 will be tried four times before SQL sql server error Engine reports a failure. As per MDSN, SQL Server uses Windows API's ReadFile, WriteFile, ReadFileScatter, WriteFileGather to perform the I/O operations. After performing these I/O operations, SQL Server checks for any error conditions associated with these API calls. If these API calls fail with an Operating System error, then SQL Server reports Error 823. There can be situations where the Windows API call actually succeeds but the data transferred by the I/O operation might have encountered a logical consistency problem. These logical consistency problems are reported through Error 824. If in any of the read attempts succeeds while retying, you will observe similar message on SQL Server ERROR 825 LOG as pasted below; A read of the file ‘D:\Data\MyDatabase\MyDatabase.mdf' at offset 0x0000005fd51000 succeeded after failing 2 time(s) with error: incorrect pageid (expected 3:241); actual 0:0). Additional messages in the SQL Server error log and system event log may provide more detail. This error condition threatens database integrity and must be corrected. Complete a full database consistency check (DBCC CHECKDB). This error can be caused by many factors; for more information, see SQL Server Books Online. Users will not see any error messages but there coul
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