What are the three types of database critical events that can trigger the database recovery process? Give some examples for each one.
Answer to relevant QuestionsWhat are the four ANSI transaction isolation levels? What type of reads does each level allow?Create a simple transaction log (using the format shown in Table) to represent the actions of the two previous transactions.Write an example of a database request.If indexes are so important, why not index every column in every table? (Include a brief discussion of the role played by data sparsity.)Should you create an index on P_CODE? If so, write the SQL command to create that index. If not, explain your reasoning.
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