Hive Create Table Like Another Table

select col1,col2,col3,col4,max() as from group by…. Loading data from Hive tables is similar to the commands above, only the source of data is from a named Hive table (in this case living in a Hive "moviedemo" database). Another option (the one I generally use), is to copy the path of the folder and paste it on the folder path box. In Hive data set are defined through tables (that expose type information) in which data can be loaded, selected and transformed through built-in operators or custom/user. Hive internally maintains metadata about the real table it is mapped to. LIKE to create an empty table based on the definition of another table, including any column attributes and indexes defined in the original table: CREATE TABLE new_tbl LIKE orig_tbl; The copy is created using the same version of the table storage format as the original table. Define storage location in HDFS. Some guidance is also provided on partitioning Hive tables and on using the Optimized Row Columnar (ORC) formatting to improve query performance. Hive Create Table / Create Table in Hive Hive internal table and Hive external table. But unfortunately we have to remove country and state columns from our hive table because we want to partition our table on these columns. log, including all the 'caused by' traces?. We can also insert the resultant data of a Hive query into another existing table as well. Creating table guru_sample with two column names such as "empid" and "empname" Coming to Tables it. Hive supports array type columns so that you can store a list of values for a row all inside a single column, and better yet can still be queried. For each table, Avro schemas and Hive table DDLs are also stored in HDFS. In this task you will be creating a job to load parsed and delimited weblog data into a Hive table. I want to create table from some metadata of another table in hive. We can also insert the resultant data of a Hive query into another existing table as well. Some links, resources, or references may no longer be accurate. LIKE works. Hive External Tables-We can also create an external table. On tables NOT receiving streaming updates, INSERT OVERWRITE will delete any existing data in the table and write the new rows. Other Data Sources In the Connector drop-down, select a data source type. Below are the commands I executed in 'hive shell'. that's true , I already came up with a process. We'll be spending 3 days and nights at the beautiful 1440 Multiversity Retreat Center. TIBCO Spotfire® connects to virtually any JDBC compliant data source via the Spotfire Server Information Services interface. There are 2 types of tables in Hive, Internal and External. If you create a managed table, then Hive is responsible to manage data in HDFS. Hive does not support what you're trying to do. CREATE TABLE LIKE PARQUET:. The HiveQL inner join is used to return the rows of multiple tables where the join condition satisfies. The table will be owned by the user issuing the command. sounds like: o create a single partition table How to compare two tables of data dynamically. autoBroadcastJoinThreshold). The SQL CREATE TABLE statement has a clause specifically for creating external tables, in which you specify the ORACLE_DATAPUMP access driver. Create your first HDInsight system in Azure Learn how to query HDInsight information using HIVE (your first query in Hive) What is Hadoop? It is a highly scalable Distributed File System (HDFS) used to handle big data. Create a Job to Load Hive. It's fairly simple to work with Databases and Tables in Azure Databricks. EsStorageHandler' TBLPROPERTIES('es. Scenario Have table with duplicate rows in hive table and Want to remove these duplicate rows from hive table. In my previous post, I outlined a strategy to update mutable data in Hadoop by using Hive on top of HBase. Hive will calculate a hash for it and assign a record to that bucket. Another option (the one I generally use), is to copy the path of the folder and paste it on the folder path box. as you can see here there are two databases, default and a custom \"MY_HIVE\". If you use the INSERT statement to insert a new row into the table without specifying a value for the task_id column, MySQL will automatically generate a sequential integer for the task_id starting from 1. When we drop a managed table, Hive deletes the data in the table. Then it is a matter of just using the INSERT command: SELECT ts, dt, line FROM logs WHERE country='GB'; CREATE TABLE bucketed users (id INT,. When I Distcp that table's files to my Prod Cluster, the orc table on the Prod cluster doesn't see and output any of the data. Some guidance is also provided on partitioning Hive tables and on using the Optimized Row Columnar (ORC) formatting to improve query performance. Create an external table named solr, and provide the field names and field types that will make up the table. Note that this guide is quite old (it was written when Hive was at version 0. You can create tables, indexes, partition tables, use external tables, Views like in a relational database Data Warehouse. json' INTO TABLE json_table; Since there are no delimiters, we leave off the ROW FORMAT section of the table DDL. They are SQL compliant and part of the ANSI SQL 99 specification. ALTER TABLE employee CHANGE salary salary BIGINT;RLIKE: Its full form is Right-Like and it is a special function in the Hive. We will name it as emphive and keep structure same as we are not doing any transformation. #hive-end-table-by-arktura #All-End-Side-Tables Get Up to 70% OFF Every Day, Plus Bulk Discounts and Personalized Service. 13 and later. Hive is a data warehouse kind of components built on top of Hadoop Distributed File System. table_name LIKE old_db. I am investigating it further whether my understanding “CREATE TABLE table_name like external_table_name will create an External table as I am creating a Table from an External Table” is wrong or whether it was valid for the earlier versions of Hive. In Hive I have an external table mapped to this hive table. Hive is really two things: 1) a structured way of storing data in tables built on Hadoop; and 2) a language (HiveQL) to interact with the tables in a SQL-like manner. Hi experts, I came all the way here and now I just realized my remote source does not show any tables under my HIVE node. In this case joins are very efficient because they require a simple merge of the presorted tables. HCatalog makes Hive metadata available to users of other Hadoop tools like Pig, MapReduce and Hive. This course is an end-to-end, practical guide to using Hive for Big Data processing. Create Table As. Folks, I am using elasticsearch-hadoop-hive-2. Using: The XML SerDe allows you to query an XML file as if it was a relational table. The syntax to create a new Table is as follows: CREATE TABLE [IF NOT EXISTS] [database. In above example two rows have same value 'abc' of name column and value of this column is used as a HBase row key value. On each insert operation hash function will define the exact bucket file for writing the data: hive> INSERT INTO TABLE testTxtBucket select id, firstname, lastname,position from test;. table_name LIKE old_db. Other Data Sources In the Connector drop-down, select a data source type. For example if an import that creates and populates a Hive table is failing, you can break it down into two steps - first for doing the import alone, and the second to create a Hive table without the import using the create-hive-table tool. So this is how Hive stores data in its managed tables. LIKE works. The SELECT privilege is required on the original table. It is another Hive join optimization technique where all the tables need to be bucketed and sorted. Hive also supports notion of external tables wherein a table can be created on prexisting files or directories in hdfs by providing the appropriate location to the table creation DDL. For those that need to programmatically interact with the Hive API, Spring for Apache Hadoop provides a dedicated template, similar to the aforementioned JdbcTemplate. Moreover, we can create a bucketed_user table with above-given requirement with the help of the below HiveQL. I doubt the difference between 11 and 10 hive guard is game breaking. Create an Oracle table over that Avro-based Hive table using the following command: CREATE TABLE mylogdata ( custid INTEGER ,. On left there is a “query editor”. Data from one table can be inserted into another table using hive queries. Register the HBase table. Lets see how to copy an existing table to new table in SQL Server. Hive Managed Tables-It is also know an internal table. Each table associates with a directory configured in /conf/hive-site. Here we are going to create sample table using Hive shell command "create" with column names. CREATE TABLE will create a new, initially empty table in the current database. Thread Tools: Search this Thread # 1 1. Create Table As. The user has to uniquely specify tabl_idx name is required for a qualified index name across tables, otherwise they are named automatically. But VALUES or using a SELECT without a FROM clause doesn't work. In Hue there is a button called “Hive” and inside Hive there are query options like “Query Editor”, “My Queries” and “Tables” etc. A look at SQL-On-Hadoop systems like PolyBase, Hive, Spark SQL in the context Distributed Computing Principles and new Big Data system design approach like the Lambda Architecture. There are two files which contain employee's basic information. Tutorial: Building simple Hive queries. Hive has limited indexing capabilities. The tasks table has the following columns: The task_id is an auto-increment column. ☀ Free Shipping All End Side Tables ☀ Hive End Table by Arktura Up To 70% Off Every Day! Wholesale Prices On Bulk Orders. That's typical when you create a managed table that that table, the name of the table, becomes a folder underneath the Hive warehouse. This means that Hive moves the data into its warehouse directory. As mentioned earlier, hive does not support MERGE command. To learn more about Hive syntax, data types and concept I`d stronly recommend this tutorial. Click on "TAGS" and create a new tag called "words_tag". Once again you knocked it out of the park. HCatalog makes Hive metadata available to users of other Hadoop tools like Pig, MapReduce and Hive. HCatalog connector automatically create a temp external table when you query that table and return results then destroy the temp table. A CTE (Common Table Expression) is temporary result set that you can reference within another SELECT, INSERT, UPDATE, or DELETE statement. Managed Table(Internal Table) External Table ; One of the main differences between an external and a managed table in Hive is that when an external table is dropped, the data associated with it doesn't get deleted, only the metadata (number of columns, type of columns, terminators, etc. The definition must include its name and the names and attributes of its columns. Hive End Table by Arktura The attraction of the Arktura Hive series is its intricate algorithmically generated cellular pattern. The partitioning in Hive means dividing the table into some parts based on the values of a particular column like date, course, city or country. In Hive, table definitions are pure metadata, they are persisted into a metastore database, and have no effect on the actual underlying HDFS files. I am trying to load a data set into hive table using row format delimited fields terminated by ',' but I noticed that some a text looks like "I love Man U\, Chelsea not playing well …" was terminated at "I love Man U" and "Chelsea not playing well" was passed into another field. Hive Managed Tables-It is also know an internal table. Let's parse that A new friend with an old face: Hive helps you leverage the power of Distributed computing and Hadoop for Analytical processing. Hive handles the conversion of the data from the source format to the destination format as the query is being executed. In the Create New Table UI you can use quickstart notebooks provided by Azure Databricks to connect to any data source. Another way to create a table by copying an existing table definition exactly (without copying the associated data) is by using the LIKE Statement as shown below. Hive is not a complete data warehousing solution as in it does not have its own storage system like another RDBMS’s but can instead be referred to as the SQL plugin for a hadoop cluster. Execute Oozie job flows to create the daily Hive tables so that way the select * from [HiveTable] from SQL server is only doing a fetch against a day’s worth of data; Have the Oozie job complete its processing of the data (Pig, MR, Hive, etc. Just for your information, Hive can do a lot more than just storing data into HBase table. Create a Temporary Table That Is LIKE Another. In other words, if we create an internal table `test`, and then use hive>drop table test;. For these multiple collections, create field datatype as array. Hive DDL — Loading data into Hive tables, Discussion on Hive Transaction, Insert table and Bucketing sequence file like below. For each author there are multiple collections. In real time Big Data Projects, you will be getting the JSON Data where you need to parse the JSON using Hive script and load them into another table. ; emp and dept. zip file to the cluster using Hue. Use at your own risk :) Dataiku DSS provides deep integration with Hive (Execution engine for visual transformations, HiveQL notebook, autocompletion, syntax checking. Getting ready. What is Sort-Merge-Bucket (SMB) Map Join in Hive? It is another Hive join optimization technique where all the tables need to be bucketed and sorted. It is a managed table, and it is a Hive compatible table because we used Hive syntax to create the table. It's an open source distribution, based on the same Hadoop core as. employeesCol You signed in with. We will name it as emphive and keep structure same as we are not doing any transformation. Brand New Table View: You can now view your actions in a table view. This has an advantage that you can size the Hadoop string data types to better match the data. This case study describes creation of internal table, loading data in it, creating views, indexes and dropping table on weather data. Once data is loaded into HDFS or another distributed file system, you can create Hive tables over the data. To make this ins. CREATE TABLE DEDUCTIONS (deduction_id Number, deduction_type Varchar2(10), Deduction_percentage number) There is another data type called Union can hold the combination of the complex data type. Some guidance is also provided on partitioning Hive tables and on using the Optimized Row Columnar (ORC) formatting to improve query performance. 2) Copy distinct rows in new table from existing table. Hive Temporary Tables, Syntax, Examples, CREATE TEMPORARY TABLE, Hive Temporary Tables Limitations, Hive Drop temporary tables, hive temporary table as select, hive temporary table like, temporary tables in Hive. It defines a schema metadata to be projected onto data in a folder when the table is queried (not when it is created). I like their inventory. ) CREATE [TEMPORARY] [EXTERNAL] TABLE [IF NOT EXISTS] [db_name. More than 1 year has passed since last update. Create Table is a statement used to create a table in Hive. select col1,col2,col3,col4,max() as from group by…. Hive is really two things: 1) a structured way of storing data in tables built on Hadoop; and 2) a language (HiveQL) to interact with the tables in a SQL-like manner. Hive flexible schema-on-read approach in permitting a table's definition to change after the table has been created. (You typically create HBase tables in Hive, because they require additional clauses not currently available in Impala. It is another Hive join optimization technique where all the tables need to be bucketed and sorted. overwrite table with data from another table - SQL That structure would look like this syntax SQL Server always assumes you are wanting to create the. Create a table using a data source. Define your table with SQL command, Create External Table if you want to keep raw file in your hdfs, and load data inpath {hdfs file path} overwrite into table {table name}. The Next step is to create a Hive table manually. Thank you for reading part 1 of a 2 part series for how to update Hive Tables the easy way. Choosing an Index type for your query optimization is another topic for explanation, which I have explained in the later part of this post. The conventions of creating a table in HIVE is quite similar to creating a table using SQL. 1) Create a new table called employee in Hive using this article. Since database name, table name and column names are case insensitive in hive, the corresponding names in entities are lowercase. Android SQLite Database with Multiple Tables So create another class named in sqlite during run the program i want create a table like student assignment mark. 10) and might not apply as-is to recent Hive releases. Hive handles the conversion of the data from the source format to the destination format as the query is being executed. The CREATE TABLE AS SELECT syntax to create a table based on column definitions from another table and copy data from the source table to the destination table. 2-Day Shipping. Hive has limited indexing capabilities. Login or Register for Dates, Times and to Reply. bucketing property to true, sot that Hive knows to create the number of buckets declared in the table definitions. The Parquet data source is now able to discover and infer partitioning information automatically. In contrast to board games, Warhammer 40,000 does not have a fixed playing field. This chapter explains how to create a table and how to insert data into it. How to Update Hive Tables the Easy Way (Part 2) is also loaded as another external table. 12 and natively in Hive 0. In this case joins are very efficient because they require a simple merge of the presorted tables. As mentioned earlier, hive does not support MERGE command. Internal table are like normal database table where data can be stored and queried on. Hive gives a SQL-like interface to query data stored in various databases and file systems that integrate with Hadoop. That's typical when you create a managed table that that table, the name of the table, becomes a folder underneath the Hive warehouse. this is a simplest table we can create in Hive, like mysql. Hive is designed to write enormous queries to handle massive amounts of data. Like if Harlequins get a 4++ and pseudofly and run+charge and a -1 or something. Instead of using a backend system to update data like HBase, it may be better to simply overwrite the. In a partitioned table, data are usually stored in different directories, with partitioning column values encoded in the path of each partition directory. Tables or partitions can again be sub-divided into buckets in Hive for that you will have to use the hash function. Shop Reviews & Shop Reviews Metal End Tables Furniture ☀ Hive End Table by Arktura Free Shipping On Orders Over $49. Btw, what version of hive/beeline/hadoop are you using? On Apr 29, 2015 3:18 PM, "Rasmus Aveskogh" [email protected] Hive Merge Tables Statement Alternative. Impala is designed to improve the query performance accessing data. COLUMNS in s. 0 and higher, you can create a table with the same column definitions as a view using the CREATE TABLE LIKE technique. Additionally all the data of a table is stored in a directory in hdfs. When writing an oracle app or sometime for testing purposes we are required to create a copy of a table. 10 DIY Tables You Can Build Quickly — The Family HandymanTo build a wood and iron pipe DIY table, simply screw together a frame, and use the flanges to attach to a wood, laminate, or door slab top. Something like this: create external table hbase_50mio_200regions (rowkey. Below are the commands I executed in 'hive shell'. Use get_json_object(JSON Object, column value to extract) Let us take this as example and parse JSON using Apache Hive Query language. Approach Steps: 1) Create a new table from old table (with same structure). What be your ultimate result? Your "need" has a semicolon that does not exist in the ?input file? In your code, the file ae_table. CREATE TABLE. How To Build Outdoor Shelving For Plants, How To Build A Diy Garden Shed, Building Shed Cost, Plans For 16x20 Pallet Shed, Backyard Storage Buildings Plans, Shed Buildings Louisburg Nc, Step By Step Pdf On How To Build A Website, and Build Shed With Landscape Timbers. Another mechanisms that I have done is to use Oozie – Workflow scheduler for Hadoop. Moreover, we can create a bucketed_user table with above-given requirement with the help of the below HiveQL. jar I defined the external table as:. In this post, i will talk about Hive Server2 metastore and show how to get table's specific properties with queries. If you have already generated a JSON table using a query, skip to step 5. 1) Create a new table called employee in Hive using this article. “They’ve done something like three times as many jobs as us,” Regent pointed out. Shop Furniture, Home Décor, Cookware & More! 2-Day Shipping. The only change is that you don't move the data, you generate it from other Hive tables with HiveQL query. Tutorial: Building simple Hive queries. Syntax for creating Hive managed table:-Hive>create table manage- tab (empid, ename string, esal int) row format delimited fields terminated by 't' lines terminated by 'm' stored as a text file;. Hive: Internal Tables. table in hive examples create table from another table in hive create table from select statement command in hive create table like another table in hive create table with skewed by in hive. Hive End Table by Arktura The attraction of the Arktura Hive series is its intricate algorithmically generated cellular pattern. CREATE TABLE bucketed_user(firstname VARCHAR(64), lastname VARCHAR(64), address STRING,. One caveat is that Hive is read intensive, and the DynamoDB table must be set up with sufficient read throughput to avoid starving other applications that are being served from it. However, with the help of CLUSTERED BY clause and optional SORTED BY clause in CREATE TABLE statement we can create bucketed tables. Usually, Spark users would use insertInto to insert data into a Hive table. ]table_name LIKE existing_table_or_view_name [LOCATION hdfs_path]. There are 2 types of tables in Hive, Internal and External. 0+ as part of HIVE-11745. In this task you will be creating a job to load parsed and delimited weblog data into a Hive table. It is a NoSQL database and is useful for storing key value pairs and accessed by row keys. On tables NOT receiving streaming updates, INSERT OVERWRITE will delete any existing data in the table and write the new rows. In Hive I have an external table mapped to this hive table. The following examples demonstrate various column and table attributes in Amazon Redshift CREATE TABLE statements. While doing hive queries we have used group by operation very often to perform all kinds of aggregation operations like sum, count, max, etc. Creating Internal Table. my_table limit 10;". Introduction to Common Table Expressions. HiveQL syntax for Parquet table A CREATE TABLE statement can specify the Parquet storage format with syntax that depends on the Hive version. Hive is not a complete data warehousing solution as in it does not have its own storage system like another RDBMS’s but can instead be referred to as the SQL plugin for a hadoop cluster. If you continue browsing the site, you agree to the use of cookies on this website. The partitioning in Hive means dividing the table into some parts based on the values of a particular column like date, course, city or country. Hint: Just copy data between Hive tables. zip file to the cluster using Hue. Create Table As. In the Hive DML example shown here, the powerful technique in Hive known as Create Table As Select, or CTAS is illustrated. Another question is can i do. The Hive metastore holds metadata about Hive tables, such as their schema and location. ) gets dropped from the Hive metastore. That means another DDL statement. Table information is also available from the INFORMATION_SCHEMA TABLES table. (Note: Hover your mouse pointer over the table to view the controls. When we create a table in Hive, it by default manages the data. The samples included here use a clean installation of the Hortonworks Sandbox and query some of the sample tables included out of the box. Spark SQL can also be used to read data from an existing Hive installation. Hive also supports notion of external tables wherein a table can be created on prexisting files or directories in hdfs by providing the appropriate location to the table creation DDL. In the Hive DML example shown here, the powerful technique in Hive known as Create Table As Select, or CTAS is illustrated. Hadoop Hive Use & Management. That reducer will sort the entire dataset. Tables can be filtered, projected, joined and unioned. In my previous post, I outlined a strategy to update mutable data in Hadoop by using Hive on top of HBase. 13 and later. In a terminal window, import the device table directly into the Hive Metastore. HIVE - Partitioning and Bucketing with examples as we told earlier that we will load this table using a new table, let's create another table T_USER_LOG_SRC. In Impala 1. Shop Furniture, Home Décor, Cookware & More! 2-Day Shipping. The actual storage is flat files, which separate fields with given delimiter. Create Table Like. When I Distcp that table's files to my Prod Cluster, the orc table on the Prod cluster doesn't see and output any of the data. md pointed at the bottom of this topic. External Table. CREATE TABLE bucketed_user(firstname VARCHAR(64), lastname VARCHAR(64), address STRING,. On my Dev cluster, I have a hive table that is stored as ORC. Another way to create a table by copying an existing table definition exactly (without copying the associated data) is by using the LIKE Statement as shown below. No Drowning, Hive-Top Feeder: I've been a backyard beekeeper for eight years, and over that time I've experimented with different types of hive designs including Horizontal Top Bar, Warré, and the foundationless Langstroth. The hadoop is just stuck in processing and doing nothing. This is easy, just run and search the output for the string compressed:true Well, it turned out that it was false for all my tables although I was pretty sure…. To make this ins. We hope this blog helped you in learning the importance of Managed and External tables in Hive and when to use those tables with particular data. Managed Table(Internal Table) External Table ; One of the main differences between an external and a managed table in Hive is that when an external table is dropped, the data associated with it doesn't get deleted, only the metadata (number of columns, type of columns, terminators, etc. I want to create a new table which will be a join result of all 10 tables. @Matt Andruff,. The table structure is defined in a meta dataset. I only use ORC tables in Hive, and while trying to understand some performance issues I wanted to make sure my tables where properly compressed. INSERT INTO TABLE tablename [PARTITION [IF NOT EXISTS]] FROM from statement. In the last tutorial, we looked at how to create databases in Hive. (A) hive> CREATE TABLE myflightinfo2007 AS. Creating tables in Hive To create tables like above in Hive, follow the steps below: 1. bucketing property which is similar to hive. SELECT 1 FROM table_with_one_row. You can run SQL to do joins and to query the Hive tables in parallel using the MapReduce framework. As of 2014, Facebook was storing upwards of 300 PB of Hive data, with 600TB of data being generated every day. A CTE always returns a result set. Let’s say you have a bunch of data stored in a table and you need to generate an insert script for each record. Partitioning in Hive. But I want to have permissions where a user can only create a hive table in a specific directory. LIKE works. Tutorial: Building simple Hive queries. internal/external table internal table is like the mysql tables, data stored in the Hive specified locations and managed by Hive. Apache Hive on ACID Alan Gates Co-founder Hortonworks April 2016 Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Teradata Import Table From Csv. So, any search APIs should use lowercase while querying on the entity names; The following hive operations are captured by hive hook currently create database; create table/view, create table as select; load, import. We will name it as emphive and keep structure same as we are not doing any transformation. As a result any queries in this external hive table gets all of the latest and greatest updates to the rows in Hbase. The SELECT privilege is required on the original table. Create a table in a notebook. We want to load files into hive partitioned table which is partitioned by year of joining. Let us create bucketed tables from our existing tables i. 13 and later. OVERWIRTE will overwrite any. The advantage of partitioning is that since the data is stored in slices, the query response time becomes faster. 2) Copy distinct rows in new table from existing table. Background: HBase is the Hadoop database, a distributed, scalable, big data store. zip file to the cluster using Hue. Some links, resources, or references may no longer be accurate. Without partition, it is hard to reuse the Hive Table if you use HCatalog to store data to Hive table using Apache Pig, as you will get exceptions when you insert data to a non-partitioned Hive Table that is not empty. The next way is to configure Hive in the remote metastore way. Let me detour from our task to give you a brief overview of table types in Hive. To learn more about Hive syntax, data types and concept I`d stronly recommend this tutorial. STORED BY - can be HBase (I haven't tried it) The index can be stored in hive table or as RCFILE in an hdfs path etc. All hive external tables appear in the metastore manager but when I do a simple “show tables” in Impala, I see that 3 tables are missing. For example if an import that creates and populates a Hive table is failing, you can break it down into two steps - first for doing the import alone, and the second to create a Hive table without the import using the create-hive-table tool. @Matt Andruff,. As mentioned earlier, hive does not support MERGE command. Working with multiple partition formats within a Hive table with Spark Problem statement and why is this interesting. Make a Honey Bee Hive From Old Wooden Skids: I've used a few different joint methods in this instructable, so choose the one you want to use based on your skill level. Also, Avro and Parquet make it possible to safely copy records from one Hive table to another. Players are expected to construct their own custom-made playing field using modular terrain models. ALTER TABLE employee CHANGE salary salary BIGINT;RLIKE: Its full form is Right-Like and it is a special function in the Hive. To understand partition in Hive, it is required to have basic understanding of Hive tables: Managed and External Table. Thanks in advanced!. So if you drop a table, then Hive will remove table metadata and will remove data in HDFS. The information that you provide in this clause enables the access driver to generate a Data Pump format file that contains the data and metadata from the Oracle database table. The method to load text file to ORC Hive table is describe in this post: How to load data from a text file to Hive table.