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  • Exam Code: H21-300
  • Exam Name: HCSE-Presales-Intelligent Campus

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Which two statements complete a transaction? (Choose two)
B. ALTER TABLE employees
C. Select MAX(sal)
FROM employees
WHERE department_id = 20;
E. DELETE employees;
F. DESCRIBE employees;
Answer: A,B
D: GRANT is a DML operation which will cause an implicit commit
E: It is important to understand that an implicit COMMIT occurs on the database when a user exits SQL*Plus or issues a data-definition language (DDL) command such as a CREATE TABLE statement, used to create a database object, or an ALTER TABLE statement, used to alter a database object.
Incorrect Answers
A:. The DELETE command is data-manipulation language (DML) command and it does not complete a transaction.
B:. The DESCRIBE command is internal SQL*Plus command and it has nothing to do with completion a transaction.
C: ROLLBACK is not used to commit or complete a transaction, it is used to undo a transaction F:. SELECT command is used to retrieve data. It does not complete a transaction.
OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 281-282 Chapter 3: Advanced Data Selection in Oracle

When can a broker consider a deal to be done?
A. if he is confident that the dealer will not back out of the deal
B. if both parties to the deal have established credit lines for each other
C. if he receives acknowledgement from both the dealers involved
D. if one party to the deal acknowledges interest
Answer: C

Scenario: Company Inc. wants to modify the HTTP
Server header so that unauthorized users and malicious code CANNOT use the header to identify the software that the HTTP server uses. Which two actions can the engineer take to meet the needs of the scenario? (Choose two.)
A. Delete the HTTP Server Type on the Server Response.
B. Mask the HTTP Server Type on the Server Response.
C. Add an HTTP Server Type on the Client Request.
D. Replace the HTTP Server Type on the Client Request.
Answer: A,B

Examine the utilization parameters for an instance:

You notice that despite having an index on the column used in the where clause, queries use full table scans with highly selective filters.
What are two possible reasons for the optimizer to use full table scans instead of index unique scans and index range scans?
A. The blocks fetched by the query are greater than the value specified by the DB_FILE_MULTIBLOCK_READ_COUNT parameter.
B. The number of leaf blocks for the indexes is high.
C. The OPTIMIZER_MODE parameter is set to ALL_ROWS.
D. The OPTIMIZER_INDEX_COST_ADJ initialization parameter is set to 100.
E. The clustering factor for the indexes is high.
Answer: A,D
D: OPTIMIZER_INDEX_COST_ADJ lets you tune optimizer behavior for access path selection to be more or less index friendly-that is, to make the optimizer more or less prone to selecting an index access path over a full table scan. The default for this parameter is 100 percent, at which the optimizer evaluates index access paths at the regular cost. Any other value makes the optimizer evaluate the access path at that percentage of the regular cost. For example, a setting of 50 makes the index access path look half as expensive as normal.
E: DB_FILE_MULTIBLOCK_READ_COUNT is one of the parameters you can use to minimize I/O during table scans. It specifies the maximum number of blocks read in one I/O operation during a sequential scan. The total number of I/Os needed to perform a full table scan depends on such factors as the size of the table, the multiblock read count, and whether parallel execution is being utilized for the operation. As of Oracle Database 10g release 2, the default value of this parameter is a value that corresponds to the maximum I/O size that can be performed efficiently. This value is platform-dependent and is 1MB for most platforms.Because the parameter is expressed in blocks, it will be set to a value that is equal to the maximum I/O size that can be performed efficiently divided by the standard block size. Note that if the number of sessions is extremely large the multiblock read count value is decreased to avoid the buffer cache getting flooded with too many table scan buffers. Even though the default value may be a large value, the optimizer will not favor large plans if you do not set this parameter. It would do so only if you explicitly set this parameter to a large value. Online transaction processing (OLTP) and batch environments typically have values in the range of 4 to 16 for this parameter. DSS and data warehouse environments tend to benefit most from maximizing the value of this parameter. The optimizer is more likely to choose a full table scan over an index if the value of this parameter is high.
* OPTIMIZER_MODE establishes the default behavior for choosing an optimization approach for the instance.
The optimizer uses a cost-based approach and optimizes with a goal of best response time to return the first n rows (where n = 1, 10, 100, 1000).
The optimizer uses a mix of costs and heuristics to find a best plan for fast delivery of the first few 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).


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