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NEW QUESTION: 1
A. Option D
B. Option B
C. Option A
D. Option C
Answer: B
NEW QUESTION: 2
Why is faithful representation important in accounting documentation?
A. It is useful if information represents what it purports to represent
B. It indicates that accountants have confirmed all of the data
C. It guarantees that all information is free from error
D. It ensures neutrality on the part of the company's accounting department
Answer: A
NEW QUESTION: 3
An administrator reviewing the message logs for a node notices an instance of a node reporting duplicate
IPs for approximately ten seconds. Data access was not reported as interrupted during that time.
In this scenario, which process would generate these messages?
A. mgwd
B. bcomd
C. vldb
D. vifmgr
Answer: A
NEW QUESTION: 4
What are three common reasons for SQL statements to perform poorly?
A. OPTIMIZER_MODE parameter set to ALL_ROWS for DSS workload
B. Stale or missing optimizer statistics
C. Histograms not existing on columns with evenly distributed data
D. Full table scans for queries with highly selective filters
E. High index clustering factor
Answer: B,D,E
Explanation:
D:The clustering_factor measures how synchronized an index is with the data in a table. A table with a high clustering factor is out-of-sequence with the rows and large index range scans will consume lots of I/O. Conversely, an index with a low clustering_factor is closely aligned with the table and related rows reside together of each data block, making indexes very desirable for optimal access.
Note:
* (Not C)Histograms are feature in CBO and it helps to optimizer to determine how data are skewed(distributed) with in the column. Histogram is good to create for the column which are included in the WHERE clause where the column is highly skewed. Histogram helps to optimizer to decide whether to use an index or full-table scan or help the optimizer determine the fastest table join order.
*OPTIMIZER_MODE establishes the default behavior for choosing an optimization approach for the instance.
all_rows
The optimizer uses a cost-based approach for all SQL statements in the session and optimizes with a goal of best throughput (minimum resource use to complete the entire statement).
