SQL Server Error 605: Learn Its Symptoms, Causes, Troubleshoot Approaches
“Hello there! I use SQL Server 2008 environment. Recently, while running some queries, the session got disconnected. Then an error message appeared that said “Msg 605 Level 21 State 3 Line 1”. I have tried running the query again but every time getting the same error message. Please help me get rid of this annoying SQL Server error 605.” – Samantha, California
Are you also getting 605 error while running a query? Do you want to have a permanent solution to this error message? If yes, then you have landed on the right page. This write-up will discuss ins and outs of this error and provide users a complete guide to SQL fatal error 605.
Table of Content
Warning Fatal Error 605 is another error that SQL Server 2008 and 2008/R2 users face quite often. This error gets generated when a query is made to read a database page, where the allocation unit cited in the page header (also known as actual allocation unit) does not coincide with the expected allocation unit as per the table(s) mentioned in the query. However, this error is not a trivial one as it ultimately bars users from running the query. That is why this error is the topic of discussion for this write-up. We will begin with the symptoms of error 605 in SQL Server.
Also Read: How to resolve SQL Server error 3456?
SQL Error 605 Solution in 5 Steps
- Launch the automated recovery solution to begin.
- Click the Open button to add SQL MDF file here.
- Select the Quick or Advanced Scan option now.
- Now, Enter the Destination Server & Database.
- Click on Export to fix SQL Server Error 605.
SQL Server Error 605 – Indications/ Symptoms
There can be two types of the severity level of SQL warning fatal error 605. One is severity 21 and another one is severity 12. If the severity level is 21, the user session gets disconnected. The entry for this error is written as EventID=605 into both the SQL ERRORLOG and Windows Application Event Log. In the case of severity 12, users will only see an error message.
Here, the first allocation unit is the actual allocation unit and the latter one is the expected allocation unit. An allocation unit is an ID that is used to identify the index and object to which a page belongs.
Recommend Solution: Use the automated software if user wants to fix all kind of SQL errors. This application is a secure solution for repair, restore, rebuild, etc tasks and save data in a healthy state. User can fix damaged MDF file of SQL Server 2019, 2017, 2016, 2014, 2012, etc.
What Causes SQL Fatal Error 605?
As we have just mentioned, Microsoft SQL Server error 605 severity 21 states 3 can have two different severity levels. Let’s know the reasons behind the two levels of error.
- Severity 21: Error 605 with Severity 21 happens if there is a page level problem, or SQL Server engine having trouble while determining the expected allocation unit
- Severity 12: If the query uses ‘read uncommitted isolation level’ or NOLOCK query hint and therefore fails, SQL error 605 of Severity 12 occurs.
The major causes of the error are:
- Hardware Failures: Hardware failures like drive damages are sometimes the main culprit of this issue.
- Corruption Issues: When the database has corruption in its files, users need to simply get rid of those corruption issues first.
- Faulty Memory: Inadequate memory allocations in the SQL Server are responsible for the critical issues in most of the cases.
- Concurrency Problems: If there are multiple operations are going on in the database at one time or multiple users are accessing the database simultaneously, they might face trouble.
- Software Bugs: Software bugs, glitches, or other minor issues may also show some hinderance, & that is why users must update the systems regularly.
- Third Party Applications: A lot of third party applications can interfere in the usual working of the SQL. For Example: Anti Viruses can restrict some of the operation which may cause the same problem.
How to Fix SQL Server Error 605 Manually?
Error 605 Severity 21: Run DBCC CHECKDB and see what comes up.
If it reports an error with message 2533, in that case, the page is corrupt or incorrect. To solve the issue, restore from a last good backup. If that is unavailable, run DBCC CHECKDB again with the Repair option. You can also go to the root of this problem by performing the following steps:
- Use SQLIOSIM tool that comes with SQL Server 2008 and SQL Server 2008 R2 to find out any system level or hardware problem.
- Make sure that PAGE_VERIFY=CHECKSUM database option is turned on. Though error message 605 can occur while checksum is enabled, confirming it will prove that the page was indeed modified incorrectly within the input-output system.
- Restore a clean database backup and transaction log backups that were taken before the SQL fatal error 605 occurred.
If DBCC CHECKDB does not come up with an error and the problem keeps occurring, contact Microsoft Technical Support team.
Error 605 with Severity 12: Follow these instructions if encountered this error:
- Do not use NOLOCK hint or ‘a read uncommitted isolation level’
- Keep retrying the query until the error disappears
- Do not make any changes to the infected tables when you are running the query
Opt for the Advanced Utility to Fix SQL Server Error Code 605 Severity 12 & 21
Since SQL Server error 605 occurs due to page level corruption, users can fix SQL Server database error using the Best SQL Recovery Software. This tool is a sure-shot solution compared to the manual approaches mentioned in the earlier section. Rather than checking all the manual tricks one by one without knowing which one will work, it is better to opt for the tool. No matter how severe the corruption is, the utility is capable of fixing all kinds of page-level corruption of SQL Server. It will work on SQL Server 2008/ 2008 R2, along with 2019, 2017, 2016, 2014, 2012, 2005, 2000.
Step-1. Launch the Tool to begin the process easily.
Step-2. Click the Open button to Add MDF files.
Step-3. Select the Quick or Advance Scan modes.
Step-4. Enter the Destination Platform to proceed.
Step-5. Hit the Export button to finish off the process.
Here, let’s have a look at the video tutorial to learn the process in a more simplified manner.
Final Remarks
SQL Server users, especially SQL 2008 users, encounter this issue due to page level corruption. Though there are various manual solutions to fix this issue, none of them can be trusted wholeheartedly. If users want to resolve SQL Server error 605 permanently, they should choose advanced tool. This application will eradicate this error and allow users to continue using their SQL server database smoothly.
Frequently Asked Questions
Ans: If you do not have the most recent backup of the SQL database, you cannot fix the error. To remove corruption from the SQL database, you can simply use the tool.
Ans: If the level of corruption is minor, it can easily be fixed. However, in the event of serious corruption, there is little chance that data corruption will be removed.
Q-3. When does a 605 SQL Error Occurs?
Ans: The MS SQL 605 code occurs after the SAP ASE discovers page allocation corruption.