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They are different things. A synonym is an alias for the object directly, a view is a construct over one or more tables. Some reasons to use a view: May need to filter, join or otherwise frig with the structure and semantics of the result set. May need to provide legacy support for an underlying structure that has changed but has dependencies ...
0. There can be a handful of cons for using Indexes where they are not required. Adding indexes in table lead to slower performance on every Insert or Update operation. It leads to more storage and are also a maintenance overhead as Indexes become become fragmented or outdated and need to be organized.
40. Parallelism is simultaneous execution of processes on a multiple cores per CPU or multiple CPUs (on a single motherboard). Concurrency is when Parallelism is achieved on a single core/CPU by using scheduling algorithms that divides the CPU’s time (time-slice). Processes are interleaved.
Pros: Declarative approach makes queries easier to understand and more compact. Extensibility and expression trees allow mostly consistent querying of multiple sources. Even in-process queries can be implemented in ways other than LINQ to Objects - e.g. Parallel LINQ and my own Push LINQ framework. Very flexible.
Pros: It is the unique way of implementing a variable number of nested loops (and the only elegant way of implementing a big constant number of nested loops). Cons: Recursive methods will often throw a StackOverflowException when processing big sets. Recursive loops don't have this problem though.
Querying across 2 different databases is a distributed query. Here is a list of some techniques plus the pros and cons: Linked servers: Provide access to a wider variety of data sources than SQL Server replication provides; Linked servers: Connect with data sources that replication does not support or which require ad hoc access
A clustered index is like the contents of a phone book. You can open the book at 'Hilditch, David' and find all the information for all of the 'Hilditch's right next to each other.
tkinter pros: part of python, nothing extra to download. Very simple syntax. The text widget is remarkably powerful and very easy to work with. The canvas widget is also very easy and powerful. No other toolkit provides the same mix of ease and power than those two widgets in my experience. Uses native widgets on the mac and windows.
4) Haskell supports programming with abstract mathematical concepts (e.g. monads, functors, combinators, GADT, etc.). I think this boosts programming productivity. 5) The Haskell type system is very flexible, and supports type inference. This reduces the possible errors a lot. The type system is checked at compile time.
29. Primary clustering means that if there is a cluster and the initial position of a new record would fall anywhere in the cluster the cluster size increases. Linear probing leads to this type of clustering. Secondary clustering is less severe, two records do only have the same collision chain if their initial position is the same.