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1.Which three statements are true about histograms?
A. They capture the distribution of different values in an index for better selectivity estimates.
B. They can be used only with indexed columns.
C. They provide metadata about distribution of and occurrences of values in a table column.
D. They provide improved selectivity estimates in the presence of data skew, resulting in execution plans with uniform distribution.
E. They help the optimizer in deciding whether to use an index or a full table scan.
F. They help the optimizer to determine the fastest table join order.
2.Which four statements are correct about communication between parallel execution process?
A. The number of logical pathways between parallel execution producers and consumers depends on the degree parallelism.
B. The shared pool can be used for parallel execution messages buffers.
C. The large pool can be used for parallel execution messages buffers.
D. The buffer cache can be used for parallel execution message buffers.
E. Communication between parallel execution processes is never required if a query uses full partition-wise joins.
F. Each parallel execution process has an additional connection to the parallel execution coordinator.