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Server 2016 SQL Server 2014 SQL Server 2012 SQL Server 2008 AdministrationBackup and Recovery Cloud High Availability Performance Tuning PowerShell Security Storage Virtualization DevelopmentASP.NET Entity Framework T-SQL Visual Studio Business IntelligencePower dbcc checkdb repair_rebuild BI SQL Server Analysis Services SQL Server Integration Services SQL Server Reporting Services dbcc checkdb sybase InfoCenters Advertisement Home > Blogs > SQL Server Questions Answered > Transaction log corruption and DBCC CHECKDB SQL Server Questions dbcc checkdb with no_infomsgs Answered Transaction log corruption and DBCC CHECKDB Jan 9, 2012 by Paul S. Randal in SQL Server Questions Answered RSS EMAIL Tweet Comments 0 In a departure from our usual Q&A style https://support.microsoft.com/en-us/kb/2015748 I want to post a follow-on to my previous discussion about how transaction log corruption can lead to transaction log backup failures, and how to recover from them (see here). Any operation that tries to use a corrupt log record will encounter failure, and DBCC CHECKDB is one of those operations. By default, DBCC CHECKDB will create a hidden database snapshot under the covers to provide http://sqlmag.com/blog/transaction-log-corruption-and-dbcc-checkdb a transactionally-consistent view of the database on which to run the consistency checks. The process for creating a database snapshot is to checkpoint the real database, and then essentially run crash-recovery on the real database, but into the context of the database snapshot – not affecting the real database. This pseudo-crash recovery rolls back the effect of any uncommitted transactions that are occurring in the real database, making the database snapshot consistent. If this process encounters a corrupt transaction log record, then the database snapshot creation will fail – leading to the DBCC CHECKDB failing too. A bunch of errors will be generated, including one that identifies the corrupt transaction log record, like below: DBCC encountered a page with an LSN greater than the current end of log LSN (141131:0:4) for its internal database snapshot. Could not read page (9647:-33648758), database 'PaulsDB' (database ID 26), LSN = (-1302554001:2131886119:4432), type = 255, isInSparseFile = 1. Please re-run this DBCC command. The page ID and its LSN are obviously completely wrong. All is not lost, however, as there are two ways around this issue. Firstly, you could employ the technique I described in the blog pos
Server 2016 SQL Server 2014 SQL Server 2012 SQL Server 2008 AdministrationBackup and Recovery Cloud High Availability Performance Tuning PowerShell Security http://sqlmag.com/powershell/run-sql-server-dbccs-check-errorlog-with-powershell Storage Virtualization DevelopmentASP.NET Entity Framework T-SQL Visual Studio Business IntelligencePower BI SQL Server Analysis Services SQL Server Integration Services SQL Server Reporting Services InfoCenters Advertisement Home > https://www.brentozar.com/archive/2014/05/dbcc-checkdb-faq/ Database Administration > PowerShell > Run Your SQL Server DBCCs and Check Your Errorlog with PowerShell Run Your SQL Server DBCCs and Check Your Errorlog with PowerShell Mar dbcc checkdb 10, 2014 Allen White EMAIL Tweet Comments 1 Advertisement Frequently when I do a health check at a new client, I find that many, if not all databases, show that a DBCC CheckDB has not been run within the last two weeks. While one may think that SQL Server will automatically report every time one dbcc checkdb error occurs, things happen, and you may not find out until it's too late. For this reason, it's wise to run this valuable check at least once a week on every database, if not more often. (If the databases are small enough, I like to run them once a night. It gives me more of an opportunity to recover with recent backups.) Related: Getting SQL Server Performance Data with PowerShell By now, you probably know that I've got PowerShell scripts for almost all my basic management tasks, and DBCC CheckDB is no exception. In Server Management Objects (SMO), the Database object has a method called CheckTables(). I use this with an argument of 'None,' and this has the equivalent of running DBCC CHECKDB WITH NO_INFOMSGS for each database. So, to connect to the instance and run CheckDB against all the databases on the instance, the code looks like this. # Connect to the specified instance $s = new-object ('Microsoft.SqlServer.Management.Smo.Server') $inst # Get
Facebook Twitter LinkedIn YouTube GitHub DBCC CheckDB FAQ: Check for Corruption in SQL Server May 27, 2014Kendra Little63 comments DBCC CheckDB: Frequently Asked Questions It's eating our logo. Will it stop at nothing??? Q: Do I really need to run DBCC CheckDB? Yes. If you're even partially in charge of a SQL Server and you'd like to keep your job, you should make sure CheckDB is being run regularly. (Seriously!) Q: But WHY do I need to run CheckDB? CheckDB helps alert you when data becomes corrupt. Data corruption can cause your users to get incorrect data, cause queries to fail, or can even take your entire SQL Server instance offline. Corruption can happen anytime. It could be caused by a problem in SQL Server, an issue with Windows, or an issue with your storage. It could also happen due to other types of software- something like a filter driver (replicating data, defragmenting drives, etc) or a virus scanner. Q: How often do I need to run CheckDB? Every day you'd like to keep your job, you should run CheckDB. OK, maybe that's a bit extreme. Most people run CheckDB against user databases every weekend. That's "normal". Is normal good enough for you? Well, maybe not! When availability is important, people choose to run CheckDB more frequently: often once per day. For system databases, why not check them every night? Q: How can I make CheckDB faster? First, do you really need to make it faster? If you have a regular maintenance window where decreased performance is OK, that's often good enough. The best way to speed up CheckDB is to offload the work to a totally different server. Do this by automating a process where you regularly restore a full backup, then run CheckDB. This approach has multiple benefits: Tests your restores Doesn't impact the production database (especially if they're using independent storage) Secondary instance can be configured to use as a "warm standby" in case the primary server fails And sure, you can potentially offload CheckDB work to a virtualized SQL Server instance. Just make sure that it has enough resources to run CheckDB fast enough. Q: Are there any shortcuts with LogShip