5 Questions in mind Before Selecting a Business Intelligence Solution

Business Intelligence is the science of analyzing business data wherever it exists within your organization or elsewhere in order to understand what has happened in the past, why it happened in the first place and what can be expected to happen in the future and why that might happen differently given different behavior.

Do I Really care about Big Data?
According to experts, there are 10 plus top sources of Big Data: Social network profiles, Social influencers, Activity-generated data, and cloud applications, Public Data, Hadoop MapReduce application results, Data warehouse appliances, Columnar/NoSQL data fount, Network , and old documents. While maybe not all relevant, there are certainly some precious in this pile that can be put to good use with the right BI solution. Don’t discount the Big Data promote.

Factors and Conditions that Affect Elections in MongoDB

Replica set members send heartbeats to each other for every two seconds. If a heartbeat does not reach within 10 seconds, the other members mark the member as dead.

Based On
Heartbeats ,Priority Comparisons ,Optime, Connections ,Network Partitions.

Heartbeats
Replica set members send heartbeats to each other every two seconds. If a heartbeat does not reach within 10 seconds, the other members mark the member as dead.

Updated Hadoop certification question

1.You decide to use Hive to process data in HDFS. You have not created any Hive tables until now. Hive is configured with its default settings. You run the following commands from the Hive shell:

CREATE DATABASE db1;

USE db1;

CREATE TABLE t1(name STRING, id INT, salary INT);

A./user/hive/db1.db/t1

B./user/hive/t1/db1.db

C./user/hive/db1/t1

D./user/hive/warehouse/db1/t1

E./user/hive/warehouse/db1.db/t1

F./user/hive/warehouse/db1t1

Gain performance with Indexing in MongoDB

MongoDB Indexes

What is indexing?

Indexes provide high performance read operations for frequently used queries.For example Index in books it makes us to find the pages easily.

Index Introduction

Index supports the efficient execution of queries in mongoDB.With index,mongodb will scan only less documents in your collection.But without index it scans all the data in your documents and it takes so much time.