what command should be used to recover vmm sql data from a backup?
When you ask a DBA what feature they would most similar to see added to the SQL Server recovery functionality, they will undoubtedly say: "The ability to recover a single table from a database backup".
Of grade, it is possible to retrieve the data of a specific table from a database backup, merely you cannot practise it without restoring the entire backup.
Why practice DBA's want this? Well, the reasons are elementary:
- More often than non, the rest of the database is fine, except that someone accidentally damaged or dropped a specific table
- Restoring an unabridged fill-in can take a significant amount of time, and generally, when a table has been damaged to such an extent that a restore is required, the DBA volition probably be experiencing pressure to get it done fast
If I would accept to estimate at why Microsoft has not provided this functionality, I would have to say that it probably relates to integrity concerns. If y'all excerpt only one tabular array from a backup, which is not at the same point of time as your current database, it might consequence in referential integrity beingness compromised. Of form, this is also true if yous restore the entire database backup so but re-create out the specified table, then either manner, this is something which will ever have to be taken into account when performing a single table recovery.
Here is a diagram of the steps which will demand to be performed to recover a single tabular array from a backup:
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Restore the latest SQL database backup and all log fill-in files up to the point in time where the data was last known to be correct, as a database with a different name on the same server
This is the part of the procedure which is probable to take longest to complete, depending on the size of your database
If y'all only demand to extract the data for a couple of tables, it may be faster to utilise ApexSQL Recover to excerpt the table information into a new database, instead of having to restore the entire backup. I volition show you how this can be done a piffling later in this commodity
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Re-create the information out of the backup into the target database
Depending on the scenario in question, you may employ one of the following techniques:
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If the table still exists, just simply some rows were deleted
Utilise and INSERT statement combined with a SELECT statement to insert only the missing rows back into the tabular array
Utilize AdventureWorks2012 GO Gear up IDENTITY_INSERT Production.Analogy ON INSERT INTO Product.Analogy (IllustrationID,Diagram,ModifiedDate) SELECT * FROM AdventureWorks2012_Restored.Production.Analogy SET IDENTITY_INSERT Product.Illustration OFF
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If the table was completely dropped
Apply the SELECT INTO statement to copy the rows and the table structure back into the database
Use AdventureWorks2012 GO SELECT * INTO Production.Illustration FROM AdventureWorks2012_Restored.Production.Illustration
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If some rows were damaged perhaps through a malicious update or another unwanted event
The MERGE statement may be used to update damaged or insert data which is missing, or even delete rows which should not exist there
USE AdventureWorks2012 GO SET IDENTITY_INSERT Product.Illustration ON MERGE Production.Analogy dest USING (SELECT * FROM AdventureWorks2012_Restored.Production.Illustration src) AS src ON dest.IllustrationID = src.IllustrationID WHEN MATCHED Then UPDATE Set dest.Diagram = src.Diagram, dest.ModifiedDate = src.ModifiedDate WHEN NOT MATCHED THEN INSERT (IllustrationID,Diagram,ModifiedDate) VALUES (src.IllustrationID,src.Diagram,src.ModifiedDate); SET IDENTITY_INSERT Production.Illustration OFF
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- Recreate any indexes, triggers, or constraints if this is required
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Resolve any referential integrity issues
This is a manual procedure and unfortunately there is no way around it. It simply has to exist done
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Run the DBCC CHECKTABLE command on the table to verify the data integrity
DBCC CHECKTABLE ("Product.Illustration")
As promised earlier, I volition now illustrate how y'all can use ApexSQL Recover to extract that information for the table without doing a full database restore
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ApexSQL Recover offers a couple of options for recovering a tabular array. The more information you have well-nigh the event that occurred, the easier information technology will exist for yous to get the tabular array back using ApexSQL Recover
I.eastward. if you know that the table was dropped with a DROP Table command or deleted using SSMS, you can use the choice recover lost information From Drib TABLE operation. This allows ApexSQL Recover to detect the data faster, since it merely needs to look for dropped tables
Let's choose that option now
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Y'all will be required to connect to the SQL Server database from where the table was dropped
- Provide the connection details
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Click Next
This screen allows you lot to add together any database backups yous may take. If you do non take backups available, ApexSQL Recover volition just endeavour to recover the information from the database that you are currently connected to
Depending on how long agone the table was dropped, very little information may still be available in the SQL Server database itself. If you practice have backups bachelor yous should add them here, this will not only speed upwards the recovery of your data but it will also improve the quality of the data retrieved
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Select the Add transaction logs pick
- Add together all the backups that you have bachelor
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Click Side by side
If you know the guess fourth dimension that the outcome occurred, choose the relevant option hither. Giving an approximate time will speed up the operation
- Select the relevant option
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Click Next
ApexSQL Recover allows you to write the extracted data to a script file or to extract it into a new database
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Select your recovery action
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Specify the name of the SQL Server database to be created, if applicable
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Click Next
Hither y'all can choose to recover either the structure and the data, or only the table structure
- Select your recovery option
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Click Recover
A outcome screen will exist displayed to show what tables were recovered
In decision
When something goes wrong and a table gets dropped or accidently truncated, you may non accept enough time to restore an entire database. When this happens, ApexSQL Recover is the answer.
ApexSQL Recover tin identify the information associated with a unmarried table and excerpt only the relevant data from your native SQL Server backups, eliminating the demand for a fourth dimension consuming full backup restore.
Downloads
Please download the script(southward) associated with this article on our GitHub repository.
Please contact us for any bug or questions with the scripts.
Jan 29, 2014
Source: https://solutioncenter.apexsql.com/how-to-recover-a-single-table-from-a-sql-server-database-backup/
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