How to Recover Dropped Table in Kusto | Kusto Query Language Tutorial (KQL)

 Topic: How to Recover Dropped Table in Kusto. 


How to recover dropped table in Kusto Query Language | Kusto Query Language Tutorial (KQL) Kusto Query Language is a powerful tool to explore your data and discover patterns, identify anomalies and outliers, create statistical modeling, and more. The query uses schema entities that are organized in a hierarchy similar to SQL's: databases, tables, and columns. A Kusto query is a read-only request to process data and return results. The request is stated in plain text, using a data-flow model that is easy to read, author, and automate. Kusto queries are made of one or more query statements.


 //How to Recover Dropped Table by using Kusto  
   
 //.undo drop table can be used to get the table back. Important points to remember  
 //1)If a Purge command was executed on this database, the undo drop table command can't be executed to a version earlier   
 //to the purge execution.  
 //2)Extent can be recovered only if the hard delete period of the extent container it resides in wasn't reached yet.  
   
 //Let's create sampel table TotalSale and insert some data.  
   
 .create table TotalSale (  
   id: int   
   ,SalePersonFName: string  
   ,SalePersonLName : string  
   ,ProductName : string  
   ,ItemsSold : int  
   ,SoldPrice :real  
   ,SoldDate: date  
   ,City : string  
   ,State : string  
   ,Country : string  
   ,Region : string  
   )  
        
      //Insert data  
       .ingest inline into table TotalSale <|  
 11,Tamara,Tony,Cell Phone,2,1200,2015-03-03,Frankfurt,Hesse,Germany,Europe  
 9,Petra,Henry,TV,10,5000,2015-04-08,Paris,Île-de-France,France,Europe  
 3,Christy,Ladson,TV,3,1600,2015-04-02,High Point,NC,USA,North America  
 7,Chirag,Patel,Cell Phone,5,1500,2015-06-23,AhmadAbad,Gujrat,India,Asia  
 2,M,Raza,Cell Phone,2,800,2015-07-15,Charlotte,NC,USA,North America  
 5,Najaf,Ali,Computer,1,300,2015-06-20,Karachi,Sindh,Pakistan,Asia  
 6,Sukhjeet,Singh,TV,2,900,2015-06-21,ChandiGar,Punjab,India,Asia  
 4,John,Rivers,Laptop,5,2400,2014-03-09,Jersey City,NJ,USA,North America  
 8,Aleena,Aman,Laptop,2,800,2015-05-25,Lahore,Punjab,Pakistan,Asia  
 10,Rita,Roger,Laptop,7,2100,2015-04-11,Paris,Île-de-France,France,Europe  
 1,Aamir,Shahzad,TV,1,700,2015-07-15,Charlotte,NC,USA,North America  
 12,aamir,Shahzad,TV,1,7000,2015-07-15,Charlotte,NC,USA,North America  
 10,Rita,Roger,Laptop,7,2100,2015-04-11,Paris,Île-de-France,France,Europe  
   
   
 //Let's drop the the TotalSale data  
 .drop table TotalSale  
   
 TotalSale  
 // get the list the dropped tables  
 .show database techbrothersdb journal | where Event == "DROP-TABLE" and EntityName == "TotalSale" | project OriginalEntityVersion  
   
 // undo drop table  
 // syntax: .undo drop table TableName [as NewTableName] version=v DB_MajorVersion.DB_MinorVersion  
   
 .undo drop table TotalSale as TotalSale version ="v105.1"  
   
 // check if table is recovered and have data  
 TotalSale  

Video Demo: How to Recover Dropped Table in Kusto

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