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Although we cannot change the world, we can change our own destiny.
NEW QUESTION: 1
SIMULATION
When might you need to migrate configuration changes?
Answer:
Explanation:
You might need to migrate customizations like apps, objects, code, reports or email
templates from a development sandbox to a training sandbox or production environment
NEW QUESTION: 2
You want to capture column group usage and gather extended statistics for better cardinality estimates for the CUSTOMERS table in the SH schema.
Examine the following steps:
1. Issue the SELECT DBMS_STATS.CREATE_EXTENDED_STATS ('SH',
'CUSTOMERS') FROM dual statement.
2 . Execute the DBMS_STATS.SEED_COL_USAGE (null, 'SH', 500) procedure.
3 . Execute the required queries on the CUSTOMERS table.
4 . Issue the SELECT DBMS_STATS.REPORT_COL_USAGE ('SH', 'CUSTOMERS')
FROM dual statement.
Identify the correct sequence of steps.
A. 3, 2, 4, 1
B. 4, 1, 3, 2
C. 3, 2, 1, 4
D. 2, 3, 4, 1
Answer: D
Explanation:
Step 1 (2). Seed column usage
Oracle must observe a representative workload, in order to determine the appropriate column groups. Using the new procedure DBMS_STATS.SEED_COL_USAGE, you tell Oracle how long it should observe the workload.
Step 2: (3) You don't need to execute all of the queries in your work during this window.
You can simply run explain plan for some of your longer running queries to ensure column group information is recorded for these queries.
Step 3. (1) Create the column groups
At this point you can get Oracle to automatically create the column groups for each of the tables based on the usage information captured during the monitoring window. You simply have to call the DBMS_STATS.CREATE_EXTENDED_STATS function for each table.This function requires just two arguments, the schema name and the table name. From then on, statistics will be maintained for each column group whenever statistics are gathered on the table.
Note:
* DBMS_STATS.REPORT_COL_USAGE reports column usage information and records all the SQL operations the database has processed for a given object.
* The Oracle SQL optimizer has always been ignorant of the implied relationships between data columns within the same table. While the optimizer has traditionally analyzed the distribution of values within a column, he does not collect value-based relationships between columns.
* Creating extended statisticsHere are the steps to create extended statistics for related table columns withdbms_stats.created_extended_stats:
1 - The first step is to create column histograms for the related columns.2 - Next, we run dbms_stats.create_extended_stats to relate the columns together.
Unlike a traditional procedure that is invoked via an execute ("exec") statement, Oracle extended statistics are created via a select statement.
NEW QUESTION: 3
조직은 Elastic Beanstalk를 사용하여 확장 성이 뛰어난 애플리케이션을 설정하고 있습니다.
퍼블릭 및 프라이빗 서브넷과 함께 ELB (Elastic Load Balancing)와 VPC (Virtual Private Cloud)를 사용하고 있습니다. 다음과 같은 요구 사항이 있습니다.
-모든 EC2 인스턴스에는 프라이빗 IP가 있어야 합니다
-모든 EC2 인스턴스는 ELB를 통해 데이터를 수신해야 합니다.
이 설정에서 필요하지 않은 것은 무엇입니까?
A. 모든 인바운드 트래픽을 ELB에서 EC2 인스턴스로 라우팅하는 라우팅 규칙을 만듭니다.
B. EC2 인스턴스에서 NAT를 통해 모든 아웃 바운드 트래픽을 라우팅하는 라우팅 규칙을 만듭니다.
C. 퍼블릭 서브넷만으로 EC2 인스턴스를 시작하십시오.
D. ELB 및 NAT를 퍼블릭 서브넷의 일부로 만 구성하십시오.
Answer: C
Explanation:
Explanation
The Amazon Virtual Private Cloud (Amazon VPC) allows the user to define a virtual networking environment in a private, isolated section of the Amazon Web Services (AWS) cloud. The user has complete control over the virtual networking environment. If the organization wants the Amazon EC2 instances to have a private IP address, he should create a public and private subnet for VPC in each Availability Zone (this is an AWS Elastic Beanstalk requirement). The organization should add their public resources, such as ELB and NAT to the public subnet, and AWC Elastic Beanstalk will assign them unique elastic IP addresses (a static, public IP address). The organization should launch Amazon EC2 instances in a private subnet so that AWS Elastic Beanstalk assigns them non-routable private IP addresses. Now the organization should configure route tables with the following rules:
http://docs.aws.amazon.com/elasticbeanstalk/latest/dg/AWSHowTo-vpc.html