Download Oracle Big Data 2016 Implementation Essentials.1z0-449.CertDumps.2018-07-24.37q.vcex

Vendor: Oracle
Exam Code: 1z0-449
Exam Name: Oracle Big Data 2016 Implementation Essentials
Date: Jul 24, 2018
File Size: 846 KB
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Demo Questions

Question 1
The NoSQL KVStore experiences a node failure. One of the replicas is promoted to primary. 
How will the NoSQL client that accesses the store know that there has been a change in the architecture?
  1. The KVLite utility updates the NoSQL client with the status of the master and replica.
  2. KVStoreConfig sends the status of the master and replica to the NoSQL client.
  3. The NoSQL admin agent updates the NoSQL client with the status of the master and replica.
  4. The Shard State Table (SST) contains information about each shard and the master and replica status for the shard.
Correct answer: D
Explanation:
Given a shard, the Client Driver next consults the Shard State Table (SST). For each shard, the SST contains information about each replication node comprising the group (step 5). Based upon information in the SST, such as the identity of the master and the load on the various nodes in a shard, the Client Driver selects the node to which to send the request and forwards the request to the appropriate node. In this case, since we are issuing a write operation, the request must go to the master node. Note: If the machine hosting the master should fail in any way, then the master automatically fails over to one of the other nodes in the shard. That is, one of the replica nodes is automatically promoted to master.References: http://www.oracle.com/technetwork/products/nosqldb/learnmore/nosql-wp-1436762.pdf
Given a shard, the Client Driver next consults the Shard State Table (SST). For each shard, the SST contains information about each replication node comprising the group (step 5). Based upon information in the SST, such as the identity of the master and the load on the various nodes in a shard, the Client Driver selects the node to which to send the request and forwards the request to the appropriate node. In this case, since we are issuing a write operation, the request must go to the master node. 
Note: If the machine hosting the master should fail in any way, then the master automatically fails over to one of the other nodes in the shard. That is, one of the replica nodes is automatically promoted to master.
References: http://www.oracle.com/technetwork/products/nosqldb/learnmore/nosql-wp-1436762.pdf
Question 2
Your customer is experiencing significant degradation in the performance of Hive queries. The customer wants to continue using SQL as the main query language for the HDFS store. 
Which option can the customer use to improve performance?
  1. native MapReduce Java programs
  2. Impala
  3. HiveFastQL
  4. Apache Grunt
Correct answer: B
Explanation:
Cloudera Impala is Cloudera's open source massively parallel processing (MPP) SQL query engine for data stored in a computer cluster running Apache Hadoop. Impala brings scalable parallel database technology to Hadoop, enabling users to issue low-latency SQL queries to data stored in HDFS and Apache HBase without requiring data movement or transformation. References: https://en.wikipedia.org/wiki/Cloudera_Impala
Cloudera Impala is Cloudera's open source massively parallel processing (MPP) SQL query engine for data stored in a computer cluster running Apache Hadoop. 
Impala brings scalable parallel database technology to Hadoop, enabling users to issue low-latency SQL queries to data stored in HDFS and Apache HBase without requiring data movement or transformation. 
References: https://en.wikipedia.org/wiki/Cloudera_Impala
Question 3
Your customer keeps getting an error when writing a key/value pair to a NoSQL replica. 
What is causing the error?
  1. The master may be in read-only mode and as result, writes to replicas are not being allowed.
  2. The replica may be out of sync with the master and is not able to maintain consistency.
  3. The writes must be done to the master.
  4. The replica is in read-only mode.
  5. The data file for the replica is corrupt.
Correct answer: C
Explanation:
Replication Nodes are organized into shards. A shard contains a single Replication Node which is responsible for performing database writes, and which copies those writes to the other Replication Nodes in the shard. This is called the master node. All other Replication Nodes in the shard are used to service read-only operations. Note: Oracle NoSQL Database provides multi-terabyte distributed key/value pair storage that offers scalable throughput and performance. That is, it services network requests to store and retrieve data which is organized into key-value pairs. References: https://docs.oracle.com/cd/E26161_02/html/GettingStartedGuide/introduction.html
Replication Nodes are organized into shards. A shard contains a single Replication Node which is responsible for performing database writes, and which copies those writes to the other Replication Nodes in the shard. This is called the master node. All other Replication Nodes in the shard are used to service read-only operations. 
Note: Oracle NoSQL Database provides multi-terabyte distributed key/value pair storage that offers scalable throughput and performance. That is, it services network requests to store and retrieve data which is organized into key-value pairs. 
References: https://docs.oracle.com/cd/E26161_02/html/GettingStartedGuide/introduction.html
Question 4
The log data for your customer's Apache web server has seven string columns.  
What is the correct command to load the log data from the file 'sample.log' into a new Hive table LOGS that does not currently exist? 
  1. hive> CREATE TABLE logs (t1 string, t2 string, t3 string, t4 string, t5 string, t6 string, t7 string) ROW FORMAT DELIMITED FIELDS TERMINATED BY ' ';
  2. hive> create table logs as select * from sample.log;
  3. hive> CREATE TABLE logs (t1 string, t2 string, t3 string, t4 string, t5 string, t6 string, t7 string) ROW FORMAT DELIMITED FIELDS TERMINATED BY ' ';
  4. hive> LOAD DATA LOCAL INPATH 'sample.log' OVERWRITE INTO TABLE logs; 
    hive> LOAD DATA LOCAL INPATH 'sample.log' OVERWRITE INTO TABLE logs;
  5. hive> CREATE TABLE logs (t1 string, t2 string, t3 string, t4 string, t5 string, t6 string, t7 string) ROW FORMAT DELIMITED FIELDS TERMINATED BY ' '; 
    hive> create table logs as load sample.1og from hadoop;
Correct answer: C
Explanation:
The CREATE TABLE command creates a table with the given name. Load files into existing tables with the LOAD DATA command. References: https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DML#LanguageManualDML-InsertingdataintoHiveTablesfromquerieshttps://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL
The CREATE TABLE command creates a table with the given name. 
Load files into existing tables with the LOAD DATA command. 
References: https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DML#LanguageManualDML-InsertingdataintoHiveTablesfromqueries
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL
Question 5
Your customer’s Oracle NoSQL store has a replication factor of 3. One of the customer’s replica nodes goes down. 
What will be the long-term performance impact on the customer’s NoSQL database if the node is replaced?
  1. There will be no performance impact.
  2. The database read performance will be impacted.
  3. The database read and write performance will be impacted.
  4. The database will be unavailable for reading or writing.
  5. The database write performance will be impacted.
Correct answer: C
Explanation:
The number of nodes belonging to a shard is called its Replication Factor. The larger a shard's Replication Factor, the faster its read throughput (because there are more machines to service the read requests) but the slower its write performance (because there are more machines to which writes must be copied). Note: Replication Nodes are organized into shards. A shard contains a single Replication Node which is responsible for performing database writes, and which copies those writes to the other Replication Nodes in the shard. This is called the master node. All other Replication Nodes in the shard are used to service read-only operations.References: https://docs.oracle.com/cd/E26161_02/html/GettingStartedGuide/introduction.html#replicationfactor
The number of nodes belonging to a shard is called its Replication Factor. The larger a shard's Replication Factor, the faster its read throughput (because there are more machines to service the read requests) but the slower its write performance (because there are more machines to which writes must be copied). 
Note: Replication Nodes are organized into shards. A shard contains a single Replication Node which is responsible for performing database writes, and which copies those writes to the other Replication Nodes in the shard. This is called the master node. All other Replication Nodes in the shard are used to service read-only operations.
References: https://docs.oracle.com/cd/E26161_02/html/GettingStartedGuide/introduction.html#replicationfactor
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