Strategy for Storing Large Amount of Ordered, but Reorderable Data in Database? -

-

If you have a large amount of data in a specific quantity (say one million lines), then in a special order To come back, one way to do this clearly is to just put that numerical index on each line and order by that index. However, if you want to create a new line in the middle of that data, then you must either expect that there is a difference between the two rows placed between the lines, or you need to set up the table "Status = Position + 1 where position> new_position "which is potentially slow and not scalable.

Is there a clever strategy to deal with this? Do I just hope to leave the big gap between my rows (possibly the lines of space with the background process). Is there a database similar to a linked list?

Edit: I know which index and how traditional order is done (Read my first sentence.) I am thinking that to put a new line in the middle of a command structure The data structure is, therefore the boundary questions can still be done. A traditional next / previous indicator will not work in such a way as a query query, which I know.

You can not just create a tip in the middle of your data, you will add it to the end of the column order The correct sequence should be used to return the data and it will be faster on indexing.

Is there a database similar to a linked list?

Not directly - There are some ideas for storing trees inside SQL - which is a little more than asking for you - but almost the same design but be aware that they are every Tupal Results in a query for (read link link, select next tube) If you deal with millions of Tuples then it will be very slow.

Your edit: You can not add between Tuples!

If you really need to do this: <

  • Old table drop
  • Rename the new table in the old table
  • Create a new table - Add everything to the desired order
  • Older tablet drop
  • Keep in mind that you need to do this for each added tuple (unless it finishes your data Is not added)

    • Comments

    Post a Comment

    Popular posts from this blog

    c# - sqlDecimal to decimal clr stored procedure Unable to cast object of type 'System.Data.SqlTypes.SqlDecimal' to type 'System.IConvertible' -

    -
    I'm new to this I'm writing a clr. stored procedure that can be used to get values ​​used in a calculation Call for another stored procedure for Gives an archived methodology int (I think SqlInt32? Value of the table's value is int) which is then necessary to convert to decimal. Here I have the code: Public static integral mood (SQL MDMMYLUE, escalistering AMY type, out of SQLDCM Result) {aResult = 0; Try {SqlConnection conn = New SqlConnection ("Reference Connection = True"); SqlCommand cmd = New SqlCommand ("sp_GetType", conn); Cmd.Parameters.AddWithValue ("@ myValueType", aMyValueType); Cmd.CommandType = CommandType.StoredProcedure; Conn.Open (); Object type = CMD. Exclamation Asser (); Conn.Close (); Decimal type FORCalculation = Convert. ToDecimal (type); Decimal value = convert toDecimal (aMyValue); // ** calculation calc = new calculation (); Decimal result = calorie.docalulation (typefarculation, value); I get an exception...
    Read more

    Calling GetGUIThreadInfo from Outlook VBA -

    -
    I need to find the active window'm writing a VBA macro in MS Outlook, which is a specific process. The goal of this is to get the active window / document name even if its original application has more than one document interface. User processor with GetCurrentThreadId is active, I am using GetGUIThreadInfo to get .dll. Here is the correct code: private type RECT as as Left LongPtr top LongPtr right LongPtr down LongPtr termination of private type GUITHREADINFO cbSize as LongPtr flags LongPtr hwndActive LongPtr hwndFocus LongPtr hwndCapture LongPtr as as as as as reset as LongPtr rcCaret as LongPtr hwndCreate as LongPtr hwndMoveSize as HwndMenuOwner end of Private Equity PtrSafe function GetWindowThreadProcessId Lib "user32" (_BVV hnw LongPtr as LongPtr Nig Mr. announced as PtrSafe function GetGUIThreadInfo Lib "user32" _ (ByVal dwthreadid as LongPtr, _ lpguithreadinfo as GUITHREADINFO) LongPtr Sub MyFunction () as dim strWindowTitle string = space as s...
    Read more

    Obfuscating Python code? -

    -
    I'm looking for a way to hide my Python source code. print "Hello World!" How can I encode this example so that it is not human-readable? I have been asked to use Base 64 but I'm not sure how. itemprop = "text"> It is limited only, first level ambiguous resolution, but has built-in: byte-code in Python Is a compiler for: dragon-o-m py_compile & lt; Your program.py & gt; creates a .pyo file with a byte-code, and where the docstrings are removed, etc. You can rename .pyo with the .py extension, and python & lt; Your program.py & gt; runs as your program, but it does not have your source code. PS : If your program blur modules like this, you need to rename them with the .pyc suffix (I Not sure it will not break a day), or you can work with .pyo and run them with python -o ... .pyo ( Import should work). This will allow dragon to search your modules (otherwise, Python looks for the .py module).
    Read more