flush_in_memory_transactions
Description:
[ Version ( since = "2.26" ) ]
public int flush_in_memory_transactions (string folder_name) throws Error
  public int flush_in_memory_transactions (string folder_name) throws Error
A pair function for start_in_memory_transactions, to commit 
      the changes to folder_name and free the in-memory table.
Parameters:
| this | 
           a DB  | 
      
| folder_name | 
           full name of the folder  | 
      
Returns:
| 
           0 on success, -1 on error  |