SQL Server provides its users with built-in methods when they encounter different type of errors. These errors create problems to the users as the database goes inaccessible. For such conditions, the user goes for DBCC CHECKDB help to check the logical integrity of the database. But while running the tool, an error may appear like this
2010-03-31 22:07:06.34 spid53 DBCC CHECKDB (mydb) executed by MYDOMAIN\theuser found 15 errors and repaired 0 errors. Elapsed time: 0 hours 0 minutes 0 seconds. Internal database snapshot has split point LSN = 00000026:0000089d:0001 and first LSN = 00000026:0000089c:0001. This is an informational message only. No user action is required.
This is a general type of error log. While executing DBCC CHECKDB, different type of data consistency errors may be encountered. This error log shows the number of consistency errors. Internal database snapshot is for online DBCC CHECKDB as it is used to present a consistent data to check. These errors indicate corruption in SQL server database and makes data inaccessible to the user.
Common reasons for data consistency in SQL server database
DBCC CHECKDB, a set of commands checks the integrity of the database using logical commands. Due to any error or disturbance, when this operation fails, you get an consistency error log. In database consistency, MS SQL server primary database and transactional log shows different data. Some of the reasons for consistency may include
- Less or no disk space
- Crash of SQL Server (Bugs inside database code)
- Hardware failure
- Power outages
- Upgrading SQL version
- Network issues
- File system corruption
- Corrupted pages in memory
One or more reasons might responsible for the error. The error can be prevented by not overlooking the reasons for it. Being careful about the different causes that might affect your database is helpful any day. Once the reason is specified or known, you can move for the solution. Even if the reason is not completely identified, you may try to resolve data consistency errors by yourself. The problem always holds a solution for it.
Manual tricks to solve data consistency errors in SQL Server database
To solve the issue, you must primarily check for any fresh backup. If the backup is available, you can restore the data. But such conditions are rare when a user is looking for some solution online. What to do when you do not have any backup? The solution is definitely there. The help is provided by Microsoft like DBCC CHKDB and DBCCDBREPAIR which are the database console commands. You can run these commands on SQL Server Management Studio to repair SQL Server database.
Using SQL Server Management Studio application
To start with you need to have SQL Server Management Studio application. This is a tool provided by Microsoft to manage and configure all components in Microsoft SQL Server. It comes with SQL Server itself. Now to resolve the SQL Server database corruption, follow the steps under.
Step1 Open Microsoft SQL Server Management Studio application on your system.
Step2 On a window opened, click New Query icon.
A new query page will get opened.
Step3 Next, on the new query page, write the following SQL Scripts
EXEC sp_resetstatus [YourDatabase];
ALTER DATABASE [YourDatabase] SET EMERGENCY
DBCC checkdb ([YourDatabase])
ALTER DATABASE [YourDatabase] SET SINGLE_USER WITH ROLLBACK IMMEDIATE
DBCC DATABASE ([YourDatabase], REPAIR_ALLOW_DATA_LOSS)
ALTER DATABASE [YourDatabase] SET MULTI_USER
Note: No change for the above query is required except for replacing ‘Your Database’ with the original name of your database file.
Step4 Click on the Execute tab. This is the final step.
You can try checking your database after the execution of this tool. The database may be accessible now. One more method to repair corrupt database is discussed here.
Using DBCC scripts
You can use DBCC scripts in SQL Server Management Studios that helps in detecting and fixing SQL database consistency errors. It helps SQL administrator to have a consistency check of SQL database in index pages, table and disk allocation structures. An example is shown below –
If you need to recover database table named ABC production, use these T-SQL script:
DBCC CHECKTABLE (XYZ production, REPAIR REBUILD)
It will rebuild missing or corrupt indexes of ABC Production table. It also restores all missing rows of non-clustered indexes in XYZ Production table.
These manual tricks are helpful in some cases but not always beneficial and trustworthy. Backup option is useful in some cases but for corrupt database elements cases, it does not work actually. By the time you decide to backup your data, corruption related to database elements has already crashed your backup as well.
When the degree of corruption is of high level, no manual trick works efficiently. While using repair option using scripts, there is always a chance of data loss. The method used is also very complex and time consuming. All these drawbacks of manual tricks call for an alternative solution.
Using a professional solution to resolve SQL Server database consistency error
Manual methods are certainly aid for the user in his bad time. The user can try it if unknown to large corruption. Sometimes, manual methods do work if the corruption is within control or small. With the learning of how manual methods work and response, users are encouraged to find a more reliable and secure alternative. The search is over with a reliable and efficient third-party SQL Database Repair tool. It is a highly innovative tool that recovers data from corrupt SQL server database within minutes. The tool is bind to provide high accuracy with recovery of file objects like tables, views, triggers, programmability, default, etc. The interface of the tool is quite user-friendly. Even a novice user is able to handle it easily. No technical expertise is required for the tool. SQL Database Repair tool is the best solution for accurate and secure recovery of data from corrupt SQL Server database.
Along with the discussion of data consistency errors and its causes, the user has come across the manual solution approach. It holds both benefits and drawbacks. However, a third-party tool SQL Database Repair is a savior in the worse conditions of database corruption.