SQL Server is very efficient at properly storing databases. Sometimes, however, the SQL server can experience problems that must be resolved as quickly as possible. When the users don’t shut down the SQL server database properly, the SQL server enters a crash recovery mode so that the system can ensure the database remains consistent. There are three types of phases when the SQL server goes into recovery mode. Each phase fixes different errors. The severity of damage is a major factor in these states, which include online, suspect, and recovery pending.
The online state allows users to still access SQL server database even if the items are corrupted during a query. During the suspect state, you won’t be able to access the database easily while the SQL server database is present in the recovery mode. The SQL server database monitors progress during the recovery pending status.
What are the different stages of SQL Server Database Recovery Recovery
If you want to recover a SQL Server database from corruption, it will need a database administrator who can restore the backup of the SQL server in a meaningful and logical sequence. While the SQL server is being moved from recovery mode to normal mode effectively, it will also be restored and restored from any supporting data. There are three stages to the recovery process.
Phase of Analysis
The phrase will thoroughly analyze the SQL server’s transaction log. This phrase will analyze the transactional log of SQL server and determine the previous checkpoint. If the SQL server database has not been shut down correctly, the ATT record will include the complete active transactional log. The DPT, on the other hand contains the entire list of dirty pages which will show when SQL Server database was closed.
Redo Phase
This phase will allow you to forward the changes that have been recorded in the log while closing down the SQL Server database. During this phase, you won’t be able to write the data files. You must use minLSN, which is the minimum sequence of logs required to successfully retrieve your SQ server database. It will allow you to start the redo operations that are required in order to support dirty pages.
Undo Phase
This is where you will find all incomplete transactions in ATT. You also ensure proper preservation of your SQL server database. Following a rollback the SQL database is brought back online.
How does the SQL Server Database enter Recovery Mode?
It is important to identify and fix the root cause of any issues. You can have many reasons why your SQL server database is in recovery mode. The SQL server can be forced to recover mode by hardware failure, improper shutdown or any other reason.
Another common cause of SQL server database recovery is insufficient hard drive space. Many problems will be caused by a corrupted SQL server database. There are other factors that could cause the SQL server to go into recovery mode.
- Transactions that are long-running and could cause disruption.
- Transactional log files that have grown in size
- Existence of VLFs in the database transaction record
- SQL Server Bug
How can you fix SQL Server in Recovery Mode?
As you are beginning the process of recovery, make sure there’s enough backup for the SQL Server and database. As per Rubrik, data backup is extremely important. You must conduct an extensive and comprehensive investigation of your SQL server database to locate the error log. You have many options to fix your SQL server recovery mode issue.
Forceful Repair
You can fix the problem by using this repair option. MS developers ask users to make a backup to their data files in order to restore and recover errors reported by DBCC CHECKDB.
The DBCC CHECKDB repair options make it possible to recover the SQL server database. For maximum success, make sure to use the CHECKDB along with other options.
Once you’ve reactivated all user modes, and run the DBCC CHECKDB along with the REPAIRBUIL command, your SQL server database should be back up. If you do not have a backup, it is possible to lose important data.
Detach SQL Server Database Database.
This can also be used to transform the SQL Server database from recovery to normal mode. The database will be able to go into emergency mode by using this mode. After the SQL Server database is available again, it’s time to make it offline before bringing it back online.
Conclusion
Here’s how to troubleshoot an SQL server that is in recovery mode. Have any questions? Comment below to ask us any other questions.
Entrepreneurship Life published the article How Can You Debugge SQL Servers in Recovery Mode.
