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M4 RDS P1 Arc (consider (strict schema pt ? (or example, a database might…

- - - - AWS select which day for maintenance and which hourly block
    - - action can apply
        
        Apply the maintenance items immediately.
        
        Schedule the maintenance items to start during your next maintenance window.
        
        Take no action.
        
        If the maintenance value is next window, defer the maintenance items by choosing Defer upgrade from Actions. You can't defer a maintenance action if it has already started.
        
        will tell which time and which date
  - - - instance store has to be terminated
      - Hence need to be backup
- - - - Consists of table, items and attribute
        
        Table no need fixed schema, no need colum and row
        
        1 data can be many attribute
      - Support 2 data models both document and key value
        
        A key-value database is a type of nonrelational database that uses a simple key-value method to store data. A key-value database stores data as a collection of key-value pairs in which a key serves as a unique identifier. Both keys and values can be anything, ranging from simple objects to complex compound objects. Key-value databases are highly partitionable
      - document format
        
        cn be Json, XML, html
      - primary key pt ?
        
        2 type of primary key
        
        partion key and sort key (Composite key)
        
        consist of 2 attribute
        
        the output of internal hash determine the partion of Dynamo dB
        
        partition is physical storage in which items are stored
        
        All items of same partition key are store together
        
        Possible 2 items have sama partition key
        
        so must have diff soft key
        
        2 more items...
        
        partition key
        
        simple primary key
        
        compose of 1 attribute
        
        Outpui is hash function of partition key
        
        IN TABLE THAT ONLY HAVE PARTITION KEY, No 2 items can have same partition key value
        
        fn
        
        function
        
        To identify each item in the table
      - Index pt ?
        
        purpose :Enable fast queries on local seoncary index and global secondary iindex
        
        2 type
        
        local secondary index
        
        Must be create when create table,
        
        Same partition key as your table
        
        diff sort key
        
        global secondary index
        
        can be create after create table
        
        definition: diff partition key and sort key as your table
        
        diff sort key
        
        Can be simple key or with sort key
      - Has no limit siz