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NEW QUESTION: 1
Examine the initializing parameters:
An index exists on the column used in the WHERE of a query. You execute the query for the first time today and notice that the query is not using the index. The CUSTOMERS table has 55000 rows.
View the exhibit and examine the query and its execution plan.
What can be the two reasons for full table scan?
A. The blocks fetched by the query are greater than the value specified by the DB_FILE_MULTIBLOCK_READ_COUNT parameter.
B. The value of the OPTIMIZER_INDEX_COST_ADJ parameter is set to a low value.
C. Average number of rows per block for the CUSTOMERS table is low.
D. The statistics for the CUSTOMERS table and the indexes stale.
E. Histogram statistics for CUST_CITY_ID are missing.
F. The OPTIMIZER_MODE parameter is set to ALL_ROWS.
Answer: D,E
Explanation:
C: Old statistics could cause this problem. "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."
NEW QUESTION: 2
A company is using AWS CodePipeline to deliver one of its applications. The delivery pipeline is triggered by changes to the master branch of an AWS CodeCommit repository and uses AWS CodeBuild to implement the test and build stages of the process and AWS CodeDeploy to deploy the application.
The pipeline has been operating successfully for several months and there have been no modifications. Following a recent change to the application's source code, AWS CodeDeploy has not deployed the updates application as expected.
What are the possible causes? (Choose two.)
A. The change was not made in the master branch of the AWS CodeCommit repository.
B. One of the earlier stages in the pipeline failed and the pipeline has terminated.
C. The AWS CodePipeline is incorrectly configured and is not executing AWS CodeDeploy.
D. One of the Amazon EC2 instances in the company's AWS CodePipeline cluster is inactive.
E. AWS CodePipeline does not have permissions to access AWS CodeCommit.
Answer: B,D
NEW QUESTION: 3
Which of the following attacks are computer threats that try to exploit computer application vulnerabilities that are unknown to others or undisclosed to the software developer?
A. Zero-day
B. Buffer overflow
C. Spoofing
D. FMS
Answer: A
Explanation:
A zero-day attack, also known as zero-hour attack, is a computer threat that tries to exploit computer application vulnerabilities which are unknown to others, undisclosed to the software vendor, or for which no security fix is available. Zero-day exploits (actual code that can use a security hole to carry out an attack) are used or shared by attackers before the software vendor knows about the vulnerability. User awareness training is the most effective technique to mitigate such attacks.
Answer option A is incorrect. The Fluhrer, Mantin, and Shamir (FMS) attack is a particular stream cipher attack, a dedicated form of cryptanalysis for attacking the widely-used stream cipher RC4. The attack allows an attacker to recover the key in an RC4 encrypted stream from a large number of messages in that stream. The FMS attack gained popularity in tools such as AirSnort and aircrack, both of which can be used to attack WEP encrypted wireless networks. Answer option C is incorrect. Buffer overflow is a condition in which an application receives more data than it is configured to accept. This usually occurs due to programming errors in the application. Buffer overflow can terminate or crash the application.
Answer option B is incorrect. Spoofing is a technique that makes a transmission appear to have come from an authentic source by forging the IP address, email address, caller ID, etc. In IP spoofing, a hacker modifies packet headers by using someone else's IP address to hide his identity. However, spoofing cannot be used while surfing the Internet, chatting on-line, etc. because forging the source IP address causes the responses to be misdirected.