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NEW QUESTION: 1
A. Option C
B. Option E
C. Option B
D. Option D
E. Option A
Answer: A,D,E
Explanation:
Explanation
C: During the first execution of a SQL statement, an execution plan is generated as usual.
D: if multi-column statistics are not present for the relevant combination of columns, the optimizer can fall back on cardinality feedback.
(not B)* Cardinality feedback. This feature, enabled by default in 11.2, is intended to improve plans for repeated executions.
optimizer_dynamic_sampling
optimizer_features_enable
* dynamic sampling or multi-column statistics allow the optimizer to more accurately estimate selectivity of conjunctive predicates.
Note:
* OPTIMIZER_DYNAMIC_SAMPLING controls the level of dynamic sampling performed by the optimizer.
Range of values. 0 to 10
* Cardinality feedback was introduced in Oracle Database 11gR2. The purpose of this feature is to automatically improve plans for queries that are executed repeatedly, for which the optimizer does not estimate cardinalities in the plan properly. The optimizer may misestimate cardinalities for a variety of reasons, such as missing or inaccurate statistics, or complex predicates. Whatever the reason for the misestimate, cardinality feedback may be able to help.
NEW QUESTION: 2
Which two descriptions are benefits of using PreparedStatement objects over static SQL in JDBC?
A. Conversion to native SQL
B. Prevention of SQL injection attacks
C. Supports BLOB types on every type of database
D. Built in support for multi database transaction semantics
E. Improved performance from frequently run SQL queries
Answer: A,E
Explanation:
Sometimes it is more convenient to use a PreparedStatement object for sending SQL statements to the database. This special type of statement is derived from the more general class, Statement, that you already know.
If you want to execute a Statement object many times, it usually reduces execution time to use a PreparedStatement object instead.
The main feature of a PreparedStatement object is that, unlike a Statement object, it is given a SQL statement when it is created. The advantage to this is that in most cases, this SQL statement is sent to the DBMS right away, where it is compiled. As a result, the PreparedStatement object contains not just a SQL statement, but a SQL statement that has been precompiled. This means that when the PreparedStatement is executed, the DBMS can just run the PreparedStatement SQL statement without having to compile it first.
Although PreparedStatement objects can be used for SQL statements with no parameters, you probably use them most often for SQL statements that take parameters. The advantage of using SQL statements that take parameters is that you can use the same statement and supply it with different values each time you execute it.
Reference: The Java Tutorials, Using Prepared Statements
NEW QUESTION: 3
An administrator is editing the IP allocation policy for a vApp. Which three options are available? (Choose three.)
A. Fixed
B. Automatic
C. Roaming
D. Transient
E. DHCP
Answer: A,D,E
Explanation: