Windows 10, Windows 7, Windows 7 Service Pack 1, Windows 8, Windows 8. Windows Server 2008 R2, Windows Server 2008 R2 SP1, Windows Server 2012, Windows. Azure SQL Database InMemory technologies greatly improve the performance of transactional and analytics workloads. Mark S. Rasmussen. In this post I want to walk through a number of SQL Server corruption recovery techniques for when youre out of luck, have no backups, and the usual methods dont work. CodePlex is the project hosting site for Microsoft SQL Server Samples and Community Projects. Projects listed here are official Microsoft samples for SQL Server 40. Ill be using the Adventure. D Route Builder Keygen on this page. Works. LT2. 00. 8R2 sample database as my victim. A Clean Start. To start out, Ive attached the downloaded database and its available on my SQL Server 2. R2 instance, under the name of AWLT2. R2. To ensure weve got a clean start, Ill run DBCC CHECKDB with the DATAPURITY flag set, just to make sure the database is OK. DBCC CHECKDB AWLT2. BackupTimelineBS1.png' alt='Adventureworkslt 2012' title='Adventureworkslt 2012' />R2 WITH ALLERRORMSGS, DATAPURITY. DBCC results forAWLT2. R2. Service Broker Msg 9. State 1 Message Types analyzed 1. Service Broker Msg 9. State 1 Service Contracts analyzed 6. Service Broker Msg 9. State 1 Services analyzed 3. Service Broker Msg 9. State 1 Service Queues analyzed 3. Service Broker Msg 9. State 1 Conversation Endpoints analyzed 0. E Prime 2 0 Keygen Crack. Service Broker Msg 9. State 1 Conversation Groups analyzed 0. Service Broker Msg 9. State 1 Remote Service Bindings analyzed 0. Service Broker Msg 9. State 1 Conversation Priorities analyzed 0. DBCC results forsys. There are 8. 05 rows in. DBCC results forsys. There are 1. 25 rows in. DBCC results forSales. LT. Product. Description. There are 7. 62 rows in. Sales. LT. Product. Description. CHECKDB found 0 allocation errors and 0 consistency errors in database AWLT2. R2. DBCC execution completed. If DBCC printed error messages, contact your system administrator. Enter Corruption. As I dont want to kill my disk drives just to introduce corruption, Ill be using Orca. MDFs Corruptor class instead. First up we need to shut down SQL Server SHUTDOWN WITH NOWAIT. Server shut down by NOWAIT request from login MSRMark S. Rasmussen. SQL Serveris terminating this process. Once the instance has been shut down, Ive located my MDF file, stored at D MSSQL DatabasesAdventure. Works. LT2. 00. 8R2. Knowing the path to the MDF file, Ill now intentially corrupt 5 of the pages in the database at a database size of 5,3. KB this will end up corrupting 3. Corruptor. Corrupt. FileD MSSQL DatabasesAdventure. Works. LT2. 00. 8R2. At this point I have no idea about which pages were actually corrupted, I just know that 3. Uh Oh. After restarting the SQL Server instance and looking at the tree of databases, its obvious were in troubleRunning DBCC CHECKDB doesnt help much DBCC CHECKDB AWLT2. R2 WITH ALLERRORMSGS, DATAPURITY. Msg 9. 26, Level 1. State 1, Line 1. Database AWLT2. R2 cannot be opened. It has been marked SUSPECT by recovery. See the SQL Server errorlog for more information. What does the errorlog sayStarting up database AWLT2. R2. 1 transactions rolled forward in database AWLT2. R2 1. 3. This is an informational message only. No user action is required. Error 8. 24, Severity 2. State 2. SQL Server detected a logical consistency based IO error incorrect pageid expected 1 2 actual 0 0. It occurred during a read of page 1 2 in database ID 1. D MSSQL DatabasesAdventure. Works. LT2. 00. 8R2. Additional messages in the SQL Server error log or system event log may provide more detail. This is a severe error condition that threatens database integrity and must be corrected immediately. Complete a full database consistency check DBCC CHECKDB. This error can be caused by many factors for more information, see SQL Server Books Online. Error 3. 41. 4, Severity 2. State 1. An error occurred during recovery, preventing the database AWLT2. R2 database ID 1. Diagnose the recovery errors and fix them, or restore from a known good backup. If errors are not corrected or expected, contact Technical Support. CHECKDB for database AWLT2. R2 finished without errors on 2. This is an informational message only no user action is required. Recovery is complete. This is an informational message only. No user action is required. This is officially not good. Our database failed to recover and cant be put online at the moment, due to IO consistency errors. Weve also got our first hint incorrectpageid expected 1 2 actual 0 0What this tells us is that the header of page 2 has been overwritten by zeros since SQL Server expected to find the value 1 2, but found 0 0 instead. Page 2 is the first GAM page in the database and is an essential part of the metadata. SQL Server also wisely told us to either fix the errors or restore from a known good backup. And this is why you should always have a recovery strategy. If you ever end up in a situation like this, without a backup, youll have to continue reading. DBCC CHECKDBSQL Server recommended that we run a full database consistency check using DBCC CHECKDB. Unfortunately, given the state of our database, DBCC CHECKDB is unable to run DBCC CHECKDB AWLT2. R2 WITH ALLERRORMSGS, DATAPURITY. Msg 9. 26, Level 1. State 1, Line 1. Database AWLT2. R2 cannot be opened. It has been marked SUSPECT by recovery. See the SQL Server errorlog for more information. In some cases you may be able to force the database online, by putting it into EMERGENCY mode. If we could get the database into EMERGENCY mode, we might just be able to run DBCC CHECKDB. ALTERDATABASE AWLT2. R2 SET EMERGENCYMsg 8. Level 2. 4, State 2, Line 1. SQL Server detected a logical consistency based IO error incorrect pageid. It occurred during areadof page 1 1. ID 1. 3atoffset. 0x. D MSSQL DatabasesAdventure. Works. LT2. 00. 8R2. Additional messages inthe SQL Server error logorsystem event log may provide more. This is a severe error condition that threatens database integrity and must. Complete a full database consistency check DBCC CHECKDB. This error can be caused by many factors for more information, see SQL Server. Even worse, it seems that page 1. Page 1. 6 is the root page of the sysallocunits base table, holding all of the allocation unit storage metadata. Without page 1. 6 there is no way for SQL Server to access any of its metadata. In short, theres no way were getting this database online Enter Orca. MDFThe Orca. MDF Database class wont be able to open the database, seeing as it does not handle corruption very well. Even so, I want to try anyway, you never know. First off youll have to shut down SQL Server to release the locks on the corrupt MDF file. SHUTDOWN WITH NOWAIT. If you then try opening the database using the Orca. MDF Database class, youll get a result like this var db new DatabaseD MSSQL DatabasesAdventure. Works. LT2. 00. 8R2. Interestingly the Database class didnt puke on the boot page ID 9 itself, so we know that that ones OK, at least. But as soon as it hit page 1. Raw. Database. While the Orca. MDF Database class cant read the database file either, Raw. Database can. Raw. Database doesnt care about metadata, it doesnt read anything but what you tell it to, and as a result of that, its much more resilient to corruption. Given that we know the corruption has resulted in pages being zeroed out, we could easily gather a list of corrupted pages by just searching for pages whose logical page ID doesnt match the one in the header var db new Raw. DatabaseD MSSQL DatabasesAdventure. Works. LT2. 00. 8R2. Wherex x. Header. Page. ID x. Page. ID. Selectx x. Page. ID. For. EachConsole. Write. Line. 2. 45. This is only possible since we know the corruption caused pages to be zeroed out, so youll rarely be this lucky. Download Microsoft SQL Server 2. Express from Official Microsoft Download Center Installation for the NEW users. Step 1 Enable. Microsoft. Net Framework 3. 5 SP1 or download and install. Microsoft. Net Framework 4. Note SQL Server Express with database engine only can work with either. NET 3. 5 SP1 or. NET 4, there is no need to have both enabled. Step 2 Download Microsoft SQL Server 2. Express by clicking the appropriate link earlier, run it, and follow the instructions in the setup wizard to install. Note If downloading using Microsoft Edge in Windows 1. Choose Directory for Extracted Files dialog with a defaultproposed path that includes System. If this occurs, please change this path to another location on your system before clicking OK. 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