{"id":1524,"date":"2019-04-21T07:47:17","date_gmt":"2019-04-21T07:47:17","guid":{"rendered":"https:\/\/prwatech.in\/blog\/?p=1524"},"modified":"2023-07-20T05:26:49","modified_gmt":"2023-07-20T05:26:49","slug":"hive-questions-and-answers","status":"publish","type":"post","link":"https:\/\/prwatech.in\/blog\/interview-questions\/hive-questions-and-answers\/","title":{"rendered":"Hive Questions and Answers"},"content":{"rendered":"<p>&nbsp;<\/p>\n<h1>Hive Interview Questions and answers<\/h1>\n<p><strong>Hive Interview Questions and answers<\/strong>, are you looking for the best interview questions on Hive? Or hunting for the best platform which provides a list of Top Rated interview questions on Hive for experienced? Then stop hunting and follow Best <a href=\"https:\/\/prwatech.in\/hadoop-training-institute-in-bangalore\/\">Hadoop Training Institute<\/a> for the List of Top-Rated <a href=\"https:\/\/prwatech.in\/hadoop-training-institute-in-bangalore\/\">Hadoop Hive<\/a> interview questions and answers for experienced for which are useful for both Fresher\u2019s and experienced.<\/p>\n<p>Are you the one who is a hunger to become Pro certified Hadoop Developer then ask your Industry Certified Experienced <a href=\"https:\/\/prwatech.in\/hadoop-training-institute-in-bangalore\/\">Hadoop Trainer<\/a> for more detailed information? Don\u2019t just dream to become Pro-Developer Achieve it learning the <a href=\"https:\/\/prwatech.in\/hadoop-training-institute-in-bangalore\/\">Hadoop Course<\/a> under world-class Trainer like a pro. Follow the below-mentioned interview questions on <a href=\"https:\/\/prwatech.in\/hadoop-training-institute-in-bangalore\/\">Hadoop<\/a> Hive with answers to crack any <a href=\"https:\/\/www.youtube.com\/watch?v=ktdATQwNv1Y\">type of interview<\/a> that you face.<\/p>\n<p>&nbsp;<\/p>\n<h3>Data modification in HIVE?<\/h3>\n<p>&nbsp;<\/p>\n<p><center><br \/>\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script><br \/>\n<!-- Display ads --><br \/>\n<ins class=\"adsbygoogle\" style=\"display: block;\" data-ad-client=\"ca-pub-9274026754180580\" data-ad-slot=\"1830863328\" data-ad-format=\"auto\" data-full-width-responsive=\"true\"><\/ins><br \/>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script><\/center>&nbsp;<\/p>\n<p><strong>Ans :<\/strong> Data modification is basically done by many ways<\/p>\n<p>1.INSERT: insertion is used the insert the records the value in the table<\/p>\n<p>Syntax :<\/p>\n<p>CREATE TABLE &lt;table_name&gt;(column_name_1 datatype,column_name2,datatype,\u2026\u2026<\/p>\n<p>Column_name_n data type) row format delimited fields terminated by \u2018,\u2019 stored as textfile;<\/p>\n<p>Example:<\/p>\n<p>create table earth(name String,idint,nametypeString,recclassString,massint,Fall_hString,yearTIMESTAMP,reclatbigint,reclongbigint,Geolocation String)row format delimited fields terminated by &#8216;,&#8217; stored as textfile;<\/p>\n<p>\u2666 UPDATE: update is used to update the records in the existing table<\/p>\n<p>Syntax :<\/p>\n<p>Update &lt;table_name&gt; set column_name=\u201d\u201d where column_name=\u201d\u201d;<\/p>\n<p>&nbsp;<\/p>\n<h2>Hadoop Hive Tutorials<\/h2>\n<p><iframe loading=\"lazy\" src=\"https:\/\/www.youtube.com\/embed\/ktdATQwNv1Y\" width=\"850\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<h3>Manage table and External table?<\/h3>\n<p><strong>ANS :\u00a0<\/strong><a href=\"https:\/\/www.youtube.com\/watch?v=ktdATQwNv1Y\">Hive table<\/a> is basically of two types :<\/p>\n<p>\u2666 Managed table: it is used to store and process the datasets in default hive directory<\/p>\n<p>Path :\/user\/hive\/warehouse\/prwatech.db\/earth<\/p>\n<p>For creating a managed table we simply declare CREATE statement as well as file format<\/p>\n<p>Syntax :<\/p>\n<p>create table earth(name String,idint,nametypeString,recclassString,massint,Fall_hString,yearTIMESTAMP,reclatbigint,reclongbigint,Geolocation String)row format delimited fields terminated by &#8216;,&#8217; stored as textfile;<\/p>\n<p>After creating the table data need to be load in the table so, we have syntax to load the data<\/p>\n<p>Syntax : Load data inpath&#8217;\/home\/cloudera\/Desktop\/Meteorite_Landings.csv overwrite into table earth.<\/p>\n<p><center><br \/>\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script><br \/>\n<!-- Display ads --><br \/>\n<ins class=\"adsbygoogle\" style=\"display: block;\" data-ad-client=\"ca-pub-9274026754180580\" data-ad-slot=\"1830863328\" data-ad-format=\"auto\" data-full-width-responsive=\"true\"><\/ins><br \/>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script><\/center>&nbsp;<\/p>\n<p>if you want to drop managed table, it deleted the meta-store of the table as well as data of the table<\/p>\n<p>\u2666 ExternalTable :-<\/p>\n<p>if we use external table we have to specify the path of the table during the creation of the table as \u201cEXTERNAL\u201d keyword<\/p>\n<p>Syntax :<\/p>\n<p>create external table example_customer(customer STRING,firstnameSTRING,lastnameSTRING,ageINT,profession STRING)row format delimited<\/p>\n<p>fields terminated by &#8216;,&#8217; LOCATION \/user\/cloudera\/external;<\/p>\n<p>if we want to drop the external table the meta-store of the table will be deleted but physical data will be remains.<\/p>\n<p>&nbsp;<\/p>\n<h3>What is SerDe and its application?<\/h3>\n<p><center><br \/>\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script><br \/>\n<!-- Display ads --><br \/>\n<ins class=\"adsbygoogle\" style=\"display: block;\" data-ad-client=\"ca-pub-9274026754180580\" data-ad-slot=\"1830863328\" data-ad-format=\"auto\" data-full-width-responsive=\"true\"><\/ins><br \/>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script><\/center>&nbsp;<\/p>\n<p><strong>Ans:\u00a0<\/strong>Whenever a file in needed to Read\/Write from\/to into the Hive table so, SerDe basically is an interface as to how to process the data in a table. As file Text InputFormat is sending\u00a0to the Hive table in hdfs as the select query is performed on the table then RecordReader will take the InputFormat file and convert it into key-value pair till the last line of the file.ThenRecordReader will return you the one record and that record is actual serialized record and that serialized data actual converted into Row represent to the end-user .whenever select query is performed that Row is called to Serde.deserialized () with the help of objectInspector class for entire Row and there is objectInspector for each field so ,object Inspector mapping each field and the deserialized the field and show to the end-user.<\/p>\n<p>&nbsp;<\/p>\n<h3>Object Inspector?<\/h3>\n<p><center><br \/>\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script><br \/>\n<!-- Display ads --><br \/>\n<ins class=\"adsbygoogle\" style=\"display: block;\" data-ad-client=\"ca-pub-9274026754180580\" data-ad-slot=\"1830863328\" data-ad-format=\"auto\" data-full-width-responsive=\"true\"><\/ins><br \/>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script><\/center>&nbsp;<\/p>\n<p><strong>ANS :\u00a0<\/strong>Object Inspector is nothing but a class that contains Serde.serialized () and Serde.Deserialized method to perform the serialization on the Row on the Table.<\/p>\n<p>&nbsp;<\/p>\n<h3>What are the different factors to achieve performance tunning in Hive?<\/h3>\n<p><center><br \/>\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script><br \/>\n<!-- Display ads --><br \/>\n<ins class=\"adsbygoogle\" style=\"display: block;\" data-ad-client=\"ca-pub-9274026754180580\" data-ad-slot=\"1830863328\" data-ad-format=\"auto\" data-full-width-responsive=\"true\"><\/ins><br \/>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script><\/center>&nbsp;<\/p>\n<p><strong>ANS :\u00a0<\/strong>Some factors to achieve performance tunning in the hive are :<\/p>\n<p>\u2666 Enable Compression: keeping data from textfile to hive table in compressed format<\/p>\n<p>Such as Gzip and Bzip2 , that provides better performance than the uncompressed performance<\/p>\n<p>\u2666 Optimized joins: we can easily improve the performance of join by enabling the Auto Convert Map joins and enabling the skew joins. AutoMap joins is very powerful and very useful features when joining the small table with Big Table .if we enable this feature in hive then the small table will store their data in the local cache of every node and join with the big table in the Map phase. it provides two advantages that loading the small data in the cache will save the read time on every data node.<\/p>\n<p>On the other hand, it avoids the skew join in the hive, since the joins are already done in the map phase for every block of the data.<\/p>\n<p>\u2666 Enable Tez execution Engine: running Hive query on the Map-reduce engine give the less performance than Tez execution engine . to enable Tezexution on the hive<\/p>\n<p>Syntax : hive &gt; set hive.execution.engine=tez;<\/p>\n<p>&nbsp;<\/p>\n<h3>What is the execution engine?<\/h3>\n<p><center><br \/>\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script><br \/>\n<!-- Display ads --><br \/>\n<ins class=\"adsbygoogle\" style=\"display: block;\" data-ad-client=\"ca-pub-9274026754180580\" data-ad-slot=\"1830863328\" data-ad-format=\"auto\" data-full-width-responsive=\"true\"><\/ins><br \/>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script><\/center>&nbsp;<\/p>\n<p><strong>ANS :\u00a0<\/strong>Execution engine basically a component which is used to provide the platform for running the hive operation such as Hive query to the table so,\u00a0 we can run two types of engine MapReduce and Tez.<\/p>\n<p>By default hive, the execution engine is running on MapReduce. To set as Tezthen :<\/p>\n<p>Syntax : hive &gt; Set hive.execution.engine=tez;<\/p>\n<p>&nbsp;<\/p>\n<h3>What is the Primary key?<\/h3>\n<p><strong>ANS: The primary<\/strong>\u00a0key is a constraint which is basically used to enforce the unique value to be inserted into the table. It uniquely identifies the records in the table<\/p>\n<p>Syntax :&lt;column_name&gt;&lt;data_type&gt;&lt;Primary key&gt;<\/p>\n<p>Example :<\/p>\n<p>Create table employee<\/p>\n<p>(<\/p>\n<p>Eidvarchar(20) primary key,<\/p>\n<p>Name varchar(20),<\/p>\n<p>Age int<\/p>\n<p>);<\/p>\n<p>&nbsp;<\/p>\n<h3>What is Vectorization?<\/h3>\n<p><center><br \/>\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script><br \/>\n<!-- Display ads --><br \/>\n<ins class=\"adsbygoogle\" style=\"display: block;\" data-ad-client=\"ca-pub-9274026754180580\" data-ad-slot=\"1830863328\" data-ad-format=\"auto\" data-full-width-responsive=\"true\"><\/ins><br \/>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script><\/center>&nbsp;<\/p>\n<p><strong>ANS:<\/strong>\u00a0Vectorization is used in the hive to improve the query optimization and also to reduce the CPU usage for typically filtering, aggregation, joins, scans. It basically scans 1024 rows at a time rather than individual rows on the table<\/p>\n<p>To enable the vectorization :<\/p>\n<p>Hive &gt; Set hive.vectorized.execution=true;<\/p>\n<p>&nbsp;<\/p>\n<h3>What is ORC &amp; REGEX?<\/h3>\n<p><center><br \/>\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script><br \/>\n<!-- Display ads --><br \/>\n<ins class=\"adsbygoogle\" style=\"display: block;\" data-ad-client=\"ca-pub-9274026754180580\" data-ad-slot=\"1830863328\" data-ad-format=\"auto\" data-full-width-responsive=\"true\"><\/ins><br \/>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script><\/center>&nbsp;<\/p>\n<p><strong>ANS:\u00a0<\/strong>ORC stands for optimized Row Columnar, it\u2019s a file format through which we can persistence our data. Among all the other format ORC is referred to as best during processing because it compresses or reduces the size of data up to 75%.On comparing sequence file, Text File and RC file Format, ORC shows better performance.<\/p>\n<p>&nbsp;<\/p>\n<h3>In which case use bucketing and partitioning individually?<\/h3>\n<p><strong>ANS :<\/strong>Partition is done on the table to optimized the query performance .when we have large data sets and we need to perform some query to the respective data sets then it takes a long time to scan and filter the required data\u00a0 .so to reduce the CPU time we need partitioning of the table , the records basically split into multiple partition . Hence, while we write the query to get the data from the table, only the required partition table is quired.<\/p>\n<p><strong>Bucketing<\/strong><\/p>\n<p>Bucketing is used to provide the equal size of the partition of the table .suppose we have large data size and partition the table based on fields, after partitioning the table size does not match the actual expectation and remains huge. Thus to overcome the issue Hive provides the Bucketing concepts. Basically it provides or allows the user to divide the table in a more manageable format.<\/p>\n<p>Synatx :create table txnrecsByCat(txnnoINT,txndateSTRING,cusnoINT,amountDOUBLE,productSTRING,citySTRING,stateSTRING,spendby<\/p>\n<p>STRING)partitioned by (category STRING) clustered by (state) INTO 10 buckets row format delimited fields terminated by &#8216;,&#8217; stored as textfile;<\/p>\n<p>&nbsp;<\/p>\n<h3>What are Hive limitations?<\/h3>\n<p><strong>ANS:<\/strong> Some of the limitations of the Hive are :<\/p>\n<p>\u2666 It does not allow the user to insert, update and delete the records the in row-level<\/p>\n<p>It only provides the option to drop the table if you are going to delete the tableitv won\u2019t because behind Hive was working with files and HDFS.<\/p>\n<p>\u2666 Hive takes less time to load the data in the table because of the property \u201cSchema on read\u201d but it takes a longer time when querying the data from the table because the data is verified with schema at the time of the query.<\/p>\n<p>\u2666 It leads to performance degradation while performing the ACID property during a transaction in hive 0.14.<\/p>\n<p>\u2666 It does not support the trigger.<\/p>\n<p>&nbsp;<\/p>\n<h3>How to define distributed cache memory size in map side join?<\/h3>\n<p><strong> ANS:\u00a0<\/strong>Map side is used in the hive to speed up the query execution when multiple tables are involved in the joins whereas, a small table is stored in memory and join is done in the map phase of the MapReduce Job. Hive joins are faster than the normal joins since no reducers are necessary.<\/p>\n<p>&nbsp;<\/p>\n<h3>How to add a column in the existing table.<\/h3>\n<p><center><br \/>\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script><br \/>\n<!-- Display ads --><br \/>\n<ins class=\"adsbygoogle\" style=\"display: block;\" data-ad-client=\"ca-pub-9274026754180580\" data-ad-slot=\"1830863328\" data-ad-format=\"auto\" data-full-width-responsive=\"true\"><\/ins><br \/>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script><\/center>&nbsp;<\/p>\n<p><strong>ANS :<\/strong>We can easily modify the existing table to add column<\/p>\n<p>Synatx : ALTER TABLE &lt;table_name&gt; add &lt;column_name&gt;&lt;data_type&gt;.<\/p>\n<p>Example :\u00a0 ALTER TABLE employee add column Martial_statusvarchar(20).<\/p>\n<p>&nbsp;<\/p>\n<h3>Can we implement multiple columns in bucketing?<\/h3>\n<p><b>ANS: <\/b>Yes we can easily implement bucketing on multiple columns of the table as it needed because bucketing is used during the partition of the table to have a more manageable way of data<\/p>\n<p>Syntax :<\/p>\n<p>create table txnrecsByCat(txnnoINT,txndateSTRING,cusnoINT,amountDOUBLE,productSTRING,citySTRING,stateSTRING,spendby<\/p>\n<p>STRING)partitioned by (category STRING) clustered by (state) INTO 10 buckets row format delimited fields terminated by &#8216;,&#8217; stored as textfile;<\/p>\n<p>&nbsp;<\/p>\n<h3>Where bad records will be storedin bucketing?<\/h3>\n<p><b>ANS: <\/b>It is basically a situation when the Text file (data) is loaded into the hive table after loading the data one of the tuple is null found in the table i.e., the data is not present in the Text File that records are considered as bad records and it is kept in other buckets.<\/p>\n<p><strong>\u00a0<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; Hive Interview Questions and answers Hive Interview Questions and answers, are you looking for the best interview questions on Hive? Or hunting for the best platform which provides a list of Top Rated interview questions on Hive for experienced? Then stop hunting and follow Best Hadoop Training Institute for the List of Top-Rated Hadoop [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3290,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[36,1709],"tags":[60],"class_list":["post-1524","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-interview-questions","category-interview-questions-interview-questions","tag-hive-interview-questions-and-answers"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Hive Interview Questions and answers for Fresher and Experienced<\/title>\n<meta name=\"description\" content=\"Here is the top Rated best Hive Interview Questions and answers for Fresher and Experienced which were prepared by Certified industry Professionals\" \/>\n<meta name=\"robots\" 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