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Linux – What is Shell? Unix is a computer Operating System which is capable of handling activities from multiple users at the same time. T Bell Labs by Ken Thompson and Dennis Ritchie. This tutorial gives a very good understanding on Unix. This tutorial has been prepared for the beginners to help them understand the basics to advanced concepts covering Unix commands, Unix shell scripting and various utilities. We assume you have adequate exposure to Operating Systems and their functionalities.
A basic understanding on various computer concepts will also help you in understanding the various exercises given in this tutorial. It is absolutely free and online. Hive Interview Questions – Learning Hive Tutorial in simple and easy steps starting from introduction, Installation, Data Types, Create Database, Drop Database, Create Table, Alter Table, Drop Table, Partitioning, Built-in Operators, Hiveql select. Where, Hiveql Select Order By, Hiveql Group By, Hiveql Joins, Built-in functions, Views and Indexes. Hive, Introduction, Installation, Data Types, Create Database, Drop Database, Create Table, Alter Table, Drop Table, Partitioning, Built-in Operators, Hiveql select. What are the different types of tables available in HIve? Managed table and external table.
In managed table both the data an schema in under control of hive but in external table only the schema is under control of Hive. No Hive does not provide insert and update at row level. So it is not suitable for OLTP system. Can a table be renamed in Hive? Can we change the data type of a column in a hive table? What is a metastore in Hive?
What is the need for custom Serde? SO users need to write their own java code to satisfy their data format requirements. Why do we need Hive? Hive is a tool in Hadoop ecosystem which provides an interface to organize and query data in a databse like fashion and write SQL like queries. It is suitable for accessing and analyzing data in Hadoop using SQL syntax. What is the default location where hive stores table data?
What are the three different modes in which hive can be run? The TIMESTAMP data types stores date in java. What are collection data types in Hive? There are three collection data types in Hive. Can we run unix shell commands from hive?