SQL Database Error 3624 – a system assertion check has failed

Running a Transaction-SQL Query on MS SQL Server 2008 or SQL Server 2008 R2 may sometimes lead to SQL Database Error 3624. This error may be caused when there is variation in length of the key data in comparison with the length of compressed key value buffer. Read on to know about the probable causes of error, its resolution steps, recovery from backup and the ultimate solution.

At times, when SQL Administrator tries to move the database from one SQL server to another, they may face an error where the SQL Database is stuck, it displays the following error message:

Location: e:\sql10_katmai_t\sql\ntdbms\storeng\dfs\access\sebind.h:1139
Expression: bufferLen >= colLen
Process ID: <ProcessID>
Msg 3624, Level 20, State 1, and Line 2

A system assertion check has failed. Check the SQL Server error log for more information. Typically, an assertion failure is caused by a software bug or database corruption. To check for database corruption, consider running DBCC CHECKDB. If you agreed to send dumps to Microsoft during setup, a mini dump will be sent to Microsoft. An update might be available from Microsoft in the latest Service Pack or in a QFE from Technical Support.

Msg 0, Level 20, State 0, Line 0

A severe error occurred on the current command. The results, if any, should be discarded.

Reasons for Error 3624:

  1. The Query derives data by means of the JOIN statement for two or more tables
  2. Data compression enabled for only one table
  3. Clustered Index key available on a column of the table
  4. The column length in one table differs from column length on other tables
  5. ON-filter enabled for the column
  6. Either the SQL server performs an operation with LOOP JOIN join-hint or this hint is used by Query

The result is that the length of key data is bigger than the length of the compressed key value buffer, thus causing the “SQL Database Error 3624 – a system assertion check has failed”. However, the assertion failure may also be caused due to software bug or corruption in database.

Try to find the cause of the error by running the DBCC CHECKDB command and work to resolve the error with most suitable SQL Database recovery option.

How to resolve SQL database error 3624

  1. Check Database consistency: DBCC CHECKDB command lets you analyze the exact cause of error, for example, whether the error is caused due to database corruption or due to bug in software’s previous release. Database corruption can be repaired but up to a certain level only.
  2. Restore with Backup: In case the corruption is too high, try to restore database from backup, however check the status before restoring database from backup. Backup should be up-to-date for restoration and not available in any of the following forms:
    • Not Up-to-date and old: In case the backup is 15 days old then the database for 15 days is not available
    • Not corrupt: Corruption in database backup will not lead to proper restoration. Even if the database is restored from backup, it cannot be used further, due to chances of further corruption
    • Database Backup not available: Database backup is not implemented. Some organizations do not invest their resources in backup and suffer when the crises arise.
  3. Apply patches: Assertion error is generally caused due to bugs in the software and fixed with service pack releases. Patching the server with latest service pack helps in removing the bug related error.

If all above cases are not able to resolve the “SQL Database Error 3624 – A system assertion check has failed”, then try to resolve the issue with some reliable and performance-based software:

  1. Deploy Stellar Repair for MS SQL software: This SQL Recovery software is available in different versions – Technician, Platinum and all-in-one Stellar Database Toolkit.
    • Technician version consists of one software which is used to repair the corrupt SQL database.
    • Platinum version consists of two software. One of these software repairs the corrupt MDF file and restores the SQL-database. The other software recovers database from the corrupt backup file.
    • Stellar Database Toolkit is available as a bundle of 3-software – one repairs corrupt SQL database; second restores the database from damaged SQL database-backup file and SQL Password Recovery recovers SQL Server database-password when the user forgets the password.

Deploy the right version – Technician, Platinum or Toolkit and start resolving SQL related errors and fixes.

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SQL Database error 3625 arises when MDF and NDF files get affected due to a bug or any database corruption. Microsoft releases patches from time to time to help resolve the software bugs. These updates are applied as software extensions. SQL database should not be in a dormant stage for long and most of the time the updated backup is also not available. In that case, installing and recovering SQL Database from Stellar Repair for MS SQL software is the right solution.

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