How to Detect or Identify SQL Database Corruption?
The article brings you information about the SQL Server database corruption identification techniques, the related causes for the corruption along with some fixes for the corruptions.
Most organizations save their crucial and huge information on Microsoft based SQL Server as they find it the reliable medium for data management. Being a relational database management system, it serves as an easy source for large as well as small business enterprises to store all the important details onto it. So, the business is highly reliable on the healthy SQL Server database.
When does issue start in SQL Server?
The most common disturbance the SQL Server user experiences is when he is working on it and stuck in the middle or unable to access the data available on SQL Server. This is an indication of the corruption issue started in SQL Server database. Beforehand knowledge of corruption unless you try to access the damaged data is not possible as earlier warning is not displayed. The screen will be displayed with error messages on executing any function on the SQL Server like fetching the data or editing the data, etc.
Causes behind SQL corruption
The credit for the main cause for corruption in SQL Server goes to hardware failure, like malfunctions in hard disk, CPU, Controller, etc. If we talk about the other reasons that contributes to the corruption issues in SQL Server database, then these are in points –
- Damaged memory disk subsystems
- Interruption due to anti-malwares and anti-spywares
- Bugs in SQL Server programs
- Improper upgrade from one SQL Server version to another
- Editing in SQL Server account
How to Identify SQL Corruption in SQL Server?
Till now, we have read about issues in SQL Server database and the reasons could be responsible for it. Now, we will be discussing on the measures that users can take to identify the corruption in SQL Server. There are 2 ways that may help the users to detect the problems in SQL Server data.
1. Detection with SQL Query:
To check any corruption in SQL Server database, run the following single line query –
If after running this query, the output results are without the rows. Then there might be a condition that no corrupt entry is available. But, one cannot fully depend on this technique as it checks only for the entries that had a corruption history. So, for new entries, detecting corruption issues is not possible this way.
2. Detection with DBCC CHECKDB:
It is the most commonly used technique by the SQL database administrators through which users can locate the damaged files. There are different commands used with the syntax DBCC CHKDB (database_name) which can check the measures like tables, quality, consistency, integrity, etc. for example - DBCC CHECKCATALOG, DBCC CHECKALLOC, and DBCC CHECKTABLE. So, after detecting corruptions issues with details as output results of these commands, the users can run the repair command as well to repair the corrupt database and can get success if the corruption is low. The repair command is as given below:
DBCC CHECKDB('database_name', REPAIR_REBUILD)
SQL Server database detection is sometimes tough sometimes in hand, but once detected, how to move on to the repair step. First choice would obviously be using the recent backups. But if the backups also does not work well or comes under corruption area, users can try running the DBCC CHECKDB commands. Users can fix the corruption issues with it or the chance is high of failure with big corruption issues.
In that case, the best recommendation would be start looking for such third-party software that works effortlessly to repair SQL Server database and provide satisfactory details. SQL Database Recovery software is an all set tool for any sort of corrupted SQL Server database files. It restores all items be it tables, procedures, triggers, etc. in its original structure back to the SQL Server location without any alterations. Choice of data saving is in the hands of users with select options. SQL Server users can first detect the issue and then later on head to repair with the software with tried-on experience.