Most voted questions in Database

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Is SELECT * harmful in Database?

There are really three major reasons: Inefficiency in ...READ MORE

Sep 7, 2018 in Database by DataKing99
 • 8,240 points • 658 views
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What are stored procedures in database?

A stored procedure is a collection of ...READ MORE

Sep 6, 2018 in Database by CodingByHeart77
 • 3,740 points • 932 views
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2 answers

Difference between primary key a composite key

candidate  key: It is the collection of ...READ MORE

Oct 14, 2020 in Database by anonymous
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What is checkpoint in Database?

Checkpoint declares a point before which all ...READ MORE

Sep 4, 2018 in Database by Sahiti
 • 6,370 points • 1,705 views
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Fragmentation in Database

Fragmentation is a feature which controls the ...READ MORE

Sep 4, 2018 in Database by Sahiti
 • 6,370 points • 387 views
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1 answer

Explain Data Dictionary

Data dictionary is a set of information ...READ MORE

Aug 30, 2018 in Database by CodingByHeart77
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Data Independence & it's types

Data Independence refers to the ability to ...READ MORE

Aug 30, 2018 in Database by CodingByHeart77
 • 3,740 points • 5,447 views
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Buckets in HIVE

There are two main reasons for performing bucketing ...READ MORE

Aug 30, 2018 in Database by kurt_cobain
 • 9,390 points • 597 views
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External and Managed Table : HIVE

The metadata information along with the table ...READ MORE

Aug 30, 2018 in Database by kurt_cobain
 • 9,390 points • 423 views
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1 answer

Hcatalog in HIVE

HCatalog supports reading and writing files in ...READ MORE

Aug 30, 2018 in Database by kurt_cobain
 • 9,390 points • 1,340 views
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1 answer

Common Hive Services

The following are commonly used services of ...READ MORE

Aug 30, 2018 in Database by kurt_cobain
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3 answers

What is Phantom deadlock?

To understand phantom deadlock, you need an ...READ MORE

Feb 13, 2019 in Database by Ravi kumar
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Ways to improve query performance using Index hunting

Index hunting help in improving query performance ...READ MORE

Aug 29, 2018 in Database by CodingByHeart77
 • 3,740 points • 1,955 views
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1 answer

components of Hbase

Apache HBase Consists of the following main ...READ MORE

Aug 28, 2018 in Database by kurt_cobain
 • 9,390 points • 626 views
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1 answer

What are stored procedures?

The stored procedure is a collection of ...READ MORE

Aug 23, 2018 in Database by CodingByHeart77
 • 3,740 points • 1,098 views
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Atomicity and Aggregation in Database

Atomicity is the condition where either all the ...READ MORE

Aug 22, 2018 in Database by DataKing99
 • 8,240 points • 2,458 views
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What is Data partitioning?

This is the process of partitioning tables, ...READ MORE

Aug 22, 2018 in Database by DataKing99
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Secondary index in Cassandra

Secondary indexes are indexes built over column ...READ MORE

Aug 21, 2018 in Database by kurt_cobain
 • 9,390 points • 769 views
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Cassandra Data Model

Cassandra Data Model consists of four main ...READ MORE

Aug 21, 2018 in Database by kurt_cobain
 • 9,390 points • 560 views
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Management Tools in Cassandra

DataStaxOpsCenter: internet-based management and monitoring solution for ...READ MORE

Aug 21, 2018 in Database by kurt_cobain
 • 9,390 points • 857 views
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Tunable Consistencies in Cassandra

Tunable Consistency is a phenomenal characteristic that ...READ MORE

Aug 21, 2018 in Database by kurt_cobain
 • 9,390 points • 756 views
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1 answer

TRIGGERS used in MySQL tables

The following TRIGGERS are allowed in MySQL:  BEFORE ...READ MORE

Aug 21, 2018 in Database by CodingByHeart77
 • 3,740 points • 495 views
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1 answer

Types of tables in MySQL

MyISAM is the default table that is ...READ MORE

Aug 21, 2018 in Database by CodingByHeart77
 • 3,740 points • 1,411 views
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1 answer

Clustered vs Non-clustered Indexes

Clustered indexes - The indexes according to ...READ MORE

Aug 20, 2018 in Database by DataKing99
 • 8,240 points • 443 views
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Indexes in Database

The index is a data structure that ...READ MORE

Aug 20, 2018 in Database by DataKing99
 • 8,240 points • 657 views
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1 answer

What is schema?

The description of a database is called ...READ MORE

Aug 17, 2018 in Database by CodingByHeart77
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What is Proactive/Retroactive/Simultaneous Update

Proactive Update: The updates that are applied ...READ MORE

Aug 17, 2018 in Database by CodingByHeart77
 • 3,740 points • 3,146 views
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2 answers

Types of relationships in Database

There are 3 types of relationships in ...READ MORE

Aug 17, 2018 in Database by zombie
 • 3,790 points • 2,356 views
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1 answer

What is Data Redundancy?

Duplication of data in the database is ...READ MORE

Aug 17, 2018 in Database by Sahiti
 • 6,370 points • 1,061 views
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2 answers

SQL vs NoSQL

Well, it depends on what you are ...READ MORE

Aug 11, 2018 in Database by slayer
 • 29,350 points • 886 views
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1 answer

When is the functional dependency known as fully functional dependency?

The criteria of fully functional dependency, is ...READ MORE

Aug 10, 2018 in Database by DataKing99
 • 8,240 points • 2,318 views
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1 answer

What is Functional dependency?

A relation is said to be in ...READ MORE

Aug 10, 2018 in Database by DataKing99
 • 8,240 points • 659 views
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2 answers

Database Lock and its types.

Hello Dataking99, A database lock is used to ...READ MORE

Apr 20, 2020 in Database by Niroj
 • 82,880 points • 17,369 views
0 votes
1 answer

Data Models operations HBase

Put Method – To store data in ...READ MORE

Aug 9, 2018 in Database by kurt_cobain
 • 9,390 points • 391 views
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1 answer

Modify schema in HBase using Programs

HBase schemas can be created or updated ...READ MORE

Aug 9, 2018 in Database by kurt_cobain
 • 9,390 points • 851 views
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1 answer

Access HFile without using Hbase

Yes, it's very much possible to access ...READ MORE

Aug 9, 2018 in Database by kurt_cobain
 • 9,390 points • 553 views
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1 answer

Thrift in Hbase

Apache Thrift is written in C++ but ...READ MORE

Aug 9, 2018 in Database by kurt_cobain
 • 9,390 points • 681 views
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1 answer

Failure of moveChunks - MongoDB

No, chunk moves are consistent and deterministic. ...READ MORE

Aug 3, 2018 in Database by kurt_cobain
 • 9,390 points
edited Jun 1, 2023 by Srinath • 400 views
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1 answer

Connection Mongos check - MongoDB

The following command needs to be used ...READ MORE

Aug 3, 2018 in Database by kurt_cobain
 • 9,390 points
edited Jun 1, 2023 by Srinath • 812 views
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1 answer

Filters in HBase

ColumnPrefixFilter: takes a single argument, a column ...READ MORE

Jul 31, 2018 in Database by kurt_cobain
 • 9,390 points • 6,490 views
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1 answer

Compaction HBase

Compaction is a process which is used ...READ MORE

Jul 31, 2018 in Database by kurt_cobain
 • 9,390 points • 476 views
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1 answer

Locking or Transactions MongoDB

MongoDB does not use conventional locking with ...READ MORE

Jul 24, 2018 in Database by shams
 • 3,670 points • 1,024 views
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1 answer

Why is MongoDB preferred?

MongoDB is considered to be best NoSQL ...READ MORE

Jul 24, 2018 in Database by shams
 • 3,670 points
edited Jun 1, 2023 by Srinath • 567 views
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1 answer

Delete row in HBase

In Hbase, whatever you write will be ...READ MORE

Jul 24, 2018 in Database by kurt_cobain
 • 9,390 points • 1,596 views
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Key Components of HBase

Zookeeper: It does the co-ordination work between client ...READ MORE

Jul 24, 2018 in Database by kurt_cobain
 • 9,390 points • 1,386 views
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Using Real Time flume Data for Analysis

By using MorphlineSolrSink we can extract, transform ...READ MORE

Jul 17, 2018 in Database by kurt_cobain
 • 9,390 points • 594 views
0 votes
1 answer

Data model operations in Hbase

1. Get(returns attributes for a specified row, Gets ...READ MORE

Jul 16, 2018 in Database by Data_Nerd
 • 2,390 points • 609 views
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1 answer

HLog and WAL in Hbase.

All edits in the HStore are stored ...READ MORE

Jul 16, 2018 in Database by Data_Nerd
 • 2,390 points • 3,627 views
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1 answer

Connection in Hbase

Following code is used to open a ...READ MORE

Jul 11, 2018 in Database by Data_Nerd
 • 2,390 points • 481 views
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Standalone Mode in Hbase

It is a default mode of HBase. ...READ MORE

Jul 11, 2018 in Database by kurt_cobain
 • 9,390 points • 1,309 views
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