Different Types of Database Corruption in SQL Server
Microsoft SQL Server is an advanced relational database management system used by businesses or professionals. It also improves the user interface and features of the SQL database which makes it a useful application for managing bulk data. Although the functionality of this application, the database created by it is more prone to corruption, which results in the inaccessibility of data. Therefore, in the upcoming section, we will discuss different types of database corruption in SQL Server and also recommend a third-party solution for the same.
Users need to be careful while working with the SQL files in order to protect them from corruption. Now, let’s quickly have a solution to
Common Reasons For SQL Server Database Corruption
There would be several reasons that can lead to database corruption in SQL Server. Microsoft SQL Server contains two different types of file systems, i.e., MDF and PDF.
MDF is the primary file system, which saves complete information and if the MDF file gets corrupted, then the database will be affected. Follow various reasons as listed below:
P-Level Corruption
The major cause of SQL Server database corruption is SQL Page Level Corruption. All the storage of data information of Microsoft SQL is there at the page level. In addition, the page is the basic unit for storing data and a basic level of the I/O function in the server. It consists of data or full details about the physical layout of a data. In any case, the pages in the database are corrupt or damaged, which stores appropriate data to preserve the database constantly.
It has the same layout for storing all pages of the SQL database server. It usually contains a page header of 96 bytes and a body of 8096 bytes. If any data inconsistency occurs in all pages, it may cause partial or database inaccessibility. As such pages will either be stored in them or acts as a pointer to another page. The missing page may disturb the database index which may result in page corruption. It’s one of the critical types of database corruption in SQL server.
Page Header Corruption
Every SQL Server database page involves a header that maintains control over the way of data information is stored on the page. There are different fields of the header, which helps to verify the consistency of the database storage structure. Anyone of them helps to provide navigation to pages smoothly, which makes up the table.
Index Types of Database Corruption in SQL Server
An index is the most important component in a relational database that helps in the recovery of the database from a table. These components are created for both tables as well as views. Moreover, it contains two types of indexes as listed below:
a) Clustered: The database might have only one cluster index as it assists in the physical sorting of a database.
b) Non-clustered: There are approximately 249 non-cluster indexes in the table or view. It gives the pointer to the corresponding index point rather than sorting the database.
Thus, if there is any corruption in cluster or non-cluster index as a result of partial or complete data loss.
Boot Page Corruption
The boot page is like the file header, which provides Metadata information. But, instead of giving the data information, the boot page provides whole information about a database. It’s there in the initial data file on page 9 of the database. It can save all details such as the creation date of a database, database ID, compatibility level, and so on. It helps in a systematic consistency checking database.
Manually Repair Corrupt Database in SQL Server
In some cases, the main cause of SQL Server database corruption is the I/O sublevel system. This problem will arise with all the drivers, controllers, or other drivers. Therefore, it is advisable first you have to check for hardware-related issues.
Further, there is an inbuilt program, i.e., the Transact-SQL command, which helps to verify the consistency of the database. Users also call this DBCC CHECKDB. It also helps to test the database for physical or logical corruption levels. It can check all links between pages, structural content, index pointers, index pages, and so on.
How to Solve Types of Database Corruption in SQL Server
Download SQL Recovery software on your desktop to repair both primary and secondary SQL databases. This tool is designed with numerous advanced features to execute the data recovery. This application is capable enough to restore deleted SQL Server database tables without any difficulty.
The software allows recovering all tables, functions, stored procedures, views, rules, triggers and Primary keys, data types, Unique keys, and other SQL database components. It is compatible with SQL Server versions 2017 and all the below versions.
Now, In several cases, users want to repair these corrupted files & then migrate them to any other server. Most of the time, the reason for this is the upgradation of the server version. Now, if you also want to execute the same tas, you can download the SQL Server Migration Tool instead. It can repair as well as migrate data files.
Summing Up
In this blog, we have discussed different types of database corruption in SQL Server in a detailed manner. Along with it, we hope users can also get help from the manual solution to fix SQL Server database corruption. According to experts, if this method fails to resolve large-size database errors, then users can use the above-mentioned tool. It is the best solution, which helps to fix corruption issues in the SQL database server.
