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NEW QUESTION: 1
View the Exhibit1 to examine the series of SQL commands. View the Exhibit2 to examine the plans available in the SQL plan baseline. The baseline in the first row of the Exhibit is created when OPTIMIZER_MODE was set to FIRST_ROWS. Which statement is true if the SQL query in exhibit1 is executed again when the value of OPTIMIZER_MODE is set to FIRST_ROWS?
parameter-optimizer (exhibit):
A. The optimizer uses a new plan because none of the plans in the exhibit2 are fixed plans.
B. The optimizer uses the plan in the first row of the exhibit2 because OPTIMIZER_MODE was set to FIRST_ROW during its creation.
C. The optimizer uses the plan in the first row of the exhibit2 because it is the latest generated plan.
D. The optimizer uses the plan in the second row of the exhibit2 because it is an accepted plan.
Answer: D
Explanation:
Explanation/Reference:
Explanation:
Setting the OPTIMIZER_MODE Initialization Parameter(Link)
The OPTIMIZER_MODE initialization parameter establishes the default behavior for choosing an optimization approach for the instance.
OPTIMIZER_MODE Initialization Parameter Values
ALL_ROWS, The optimizer uses a cost-based approach for all SQL statements in the session
regardless of the presence of statistics and optimizes with a goal of best throughput (minimum resource use to complete the entire statement). This is the default value.
FIRST_ROWS_n, The optimizer uses a cost-based approach, regardless of the presence of statistics,
and optimizes with a goal of best response time to return the first n number of rows, where n equals 1,
10, 100, or 1000. FIRST_ROWS, The optimizer uses a mix of cost and heuristics to find a best plan for fast delivery of the first few rows.
Note that using heuristics sometimes leads the optimizer to generate a plan with a cost that is significantly larger than the cost of a plan without applying the heuristic. FIRST_ROWS is available for backward compatibility and plan stability; use FIRST_ROWS_n instead.
NEW QUESTION: 2
A security administrator develops a web page and limits input into the fields on the web page as well as filters special characters in output. The administrator is trying to prevent which of the following attacks?
A. Spoofing
B. XSS
C. Pharming
D. Fuzzing
Answer: B
Explanation:
Cross-site scripting (XSS) is a type of computer security vulnerability typically found in Web applications. XSS enables attackers to inject client-side script into Web pages viewed by other users.
Cross-site scripting uses known vulnerabilities in web-based applications, their servers, or plug-in systems on which they rely. Exploiting one of these, attackers fold malicious content into the content being delivered from the compromised site. When the resulting combined content arrives at the client-side web browser, it has all been delivered from the trusted source, and thus operates under the permissions granted to that system. By finding ways of injecting malicious scripts into web pages, an attacker can gain elevated access-privileges to sensitive page content, session cookies, and a variety of other information maintained by the browser on behalf of the user.
By validating user input and preventing special characters, we can prevent the injection of client-side scripting code.
Incorrect Answers:
A. There are several kinds of spoofing including email, caller ID, MAC address, and uniform resource locator (URL) spoof attacks. All types of spoofing are designed to imitate something or someone.
Email spoofing (or phishing), used by dishonest advertisers and outright thieves, occurs when email is sent with falsified "From:" entry to try and trick victims that the message is from a friend, their bank, or some other legitimate source. Any email that claims it requires your password or any personal information could be a trick.
In a caller ID attack, the spoofer will falsify the phone number he/she is calling from.
Input validation is not used to prevent spoofing.
C. Fuzz testing or fuzzing is a software testing technique used to discover coding errors and security loopholes in software, operating systems or networks by inputting massive amounts of random data, called fuzz, to the system in an attempt to make it crash. If a vulnerability is found, a tool called a fuzz tester (or fuzzer), indicates potential causes.
Fuzz testing was originally developed by Barton Miller at the University of Wisconsin in 1989. This is not what is described in this question. Input validation is not used to prevent fuzzing.
D. Similar in nature to e-mail phishing, pharming seeks to obtain personal or private (usually financial related) information through domain spoofing. Rather than being spammed with malicious and mischievous e-mail requests for you to visit spoof Web sites which appear legitimate, pharming 'poisons' a DNS server by infusing false information into the DNS server, resulting in a user's request being redirected elsewhere. Your browser, however will show you are at the correct Web site, which makes pharming a bit more serious and more difficult to detect. Phishing attempts to scam people one at a time with an e-mail while pharming allows the scammers to target large groups of people at one time through domain spoofing. Input validation is not used to prevent pharming.
References:
http://en.wikipedia.org/wiki/Cross-site_scripting
http://searchsecurity.techtarget.com/definition/fuzz-testing
http://www.webopedia.com/TERM/P/pharming.html
NEW QUESTION: 3
A. Option D
B. Option B
C. Option A
D. Option C
Answer: A