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What is serializability ? Explain view serializability

What is serializability ? Explain view serializability What do you understand by attribute closure ?give example What is the importance of query optimization? what is its objective. Describe the different steps of query processing.are these same steps of a procedural language compiler? explain Explain how query parsing is carried out in a DBMS Describe the basic approach used in cost-based query optimization used in system R.

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