After you apply the 'Alter Table' T-SQL or Transaction-SQL command to modify a column that is not null to null, you can get incorrect results. The problem occurs if the database column is a clustered index key in SQL Server. Furthermore, you may face any of the given corruption symptoms: A person records that have null columns. A database has marked as suspect. Furthermore, the database becomes hard to get. In the Server error log, you discover runtime errors that looks like the following:spid58 Error: 644, Severity: 21, State: 1spid58 could not find the index entry for RID '360000000002000101000f00383136+ in index page (1:77); index ID 0, database 'testdb'.spid58 Error: 3314, Severity: 21, State: 4spid58 Error while undoing logged operation in database 'testdb'. Error at log record ID (5:141:239).spid58 Error: 9001, Severity: 21, State: 1spid58 the log for database 'testdb' is not that can be found.spid58 Error: 3314, Severity: 21, State: 5spid58 Error while undoing logged operation in database 'testdb'. Error at log record ID (5:32:1).spid17 Database 'testdb' (database ID 18) were not able to recover. Contact Technical Support. When you run dbcc checkdb command, you will get corruption errors.Reasons of the problemThere are two possible reasons of this issue: Syscolumns and sysindexes system tables are damaged A column is the part for the clustered index key could be null
It is the critical situation of SQL Server database corruption that requires being resolved as soon as possible.How to fix itYou can resolve the problem only by repairing the damaged database. You can repair the database of MDF file by when using the SQL Recovery software. SQL recovery are the alternative party applications designed for MDF repair in all critical situations of MDF file corruption error.MDF recovery software are fairly easy to employ an and the&nbs;SQL repair could be carried out by user itself without having any sound technical knowledge. The effective SQL recovery software can perform complete MDF repair and the else case can worse the scenario.Stellar Phoenix SQL Database Recovery is the best ever made and in order to use SQL recovery software that is applicable in each case of MDF crime. Using this MDF repair software, you repair and restore all of the SQL server objects such as tables, reports, macros, stored procedures, user defined data types, defaults and many others.