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NEW QUESTION: 1
A. Option D
B. Option E
C. Option C
D. Option B
E. Option A
Answer: A,C,E
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 three configurations would you recommend to provide High Availability? (Choose three.)
A. using Normal redundancy diskgroups for all diskgroups where the primary database is protected by a Data Guard standby database that is deployed on the same Exadata Database Machine
B. using Normal redundancy diskgroups for all diskgroups where the primary database is protected by a Data Guard standby database that is deployed on a separate Exadata Database Machine
C. when no Data Guard standby database is deployed, using High redundancy for both the RECO and DATA diskgroups
D. when no Data Guard standby database is available, configuring Exadata as a stretched RAC
E. configuring bonding for the management network in order to provide highest availability for the Data Guard network
F. enabling Flashback Technologies - for fast point-in-time recovery from logical corruptions and for fast reinstatement of a primary database following failover
Answer: C,E,F
NEW QUESTION: 3
You are implementing an ASP.NET page that includes a text box.
You need to validate values that are typed by users to ensure that only numeric values are submitted.
Which control markup should you use?
A. <asp:TextBox ID="txt1" runat="server" /> <asp:RegularExpressionValidator ID="val1" EnableClientScript="true" ControlToValidate="txt1" ValidationExpression="[0-9]*" ErrorMessage="Invalid input value" />
B. <asp:TextBox ID="txt1" runat="server" /> <asp:RegularExpressionValidator ID="val1" runat="server" ControlToValidate="txt1"
ValidationExpression="[0-9]*" ErrorMessage="Invalid input value" />
C. <asp:TextBox ID="txt1" runat="server" CausesValidation="true" ValidationGroup= "Numeric" />
D. <asp:TextBox ID="txt1" runat="server" EnableClientScript="true" ValidationGroup= "Numeric" />
Answer: B
NEW QUESTION: 4
When starting to adopt SOA, which action should be taken early to help drive acceptance and success?
A. Prepare the infrastructure for SOA by establishing a development environment, testing environment and the control process to promote services.
B. Establish the SOA strategy and project roadmap.
C. Identify the first services required and ensure they are designed well, considering security and scalability.
D. Roll the SOA project in as the next phase of a project under development to prove the value to the business.
Answer: B