Difference between array, arraylist, List, Hashtable, Dictionary and SortedList in c#

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Basic difference is that arrays are of fixed size. Whereas an ArrayList implements the list data structure and can dynamically grow. While arrays would be more performance that a list, a list would be far more flexible since you don't need to know the required size initially. Array - represents an old-school memory array - kind of like a alias for a normal type[] array. Can enumerate. Can't grow automatically. I would assume very fast insertion, retrieve and speed. ArrayList - automatically growing array. Adds more overhead. Can enum., probably slower than a normal array but still pretty fast. These are used a lot in .NET List - one of my favorites - can be used with generics, so you can have a strongly typed array, e.g. List . Other than that, acts very much like ArrayList. Hashtable - plain old hashtable. O(1) to O(n) worst case. Can enumerate the value and keys properties, and do key/val pairs. Dictionary - same as above only strongly typed via generics, such a...
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What is ACID rule for transactions in Database

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Following is the important ACID rule for transactions in relational Database
  • Transaction must be Atomic (it is one unit of work and does not dependent on previous and following transactions)
  • Transaction must be Consistent (data is either committed or roll back, no “in-between” case where something has been updated and something hasn’t)
  • Transaction must be Isolated (no transaction sees the intermediate results of the current transaction)
  • Transaction must be Durable (the values persist if the data had been committed even if the system crashes right after)

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  1. Sports education worldwide5 December 2018 at 04:56

    ok thanks for this post it's quite informative and I have learned new things.

    appvn

    ReplyDelete

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