When I have a table at my sqoop schema and want to delete it, I go to HIVE editor (through HUE) and key in the following command DROP TABLE IF EXISTS schemaName.tblName PURGE; After that the table disappeared form the gui of HUE (sqoop table list, metastore list) but the actual files of the table were not deleted from the HDFS. INSERT INTO TABLE test_delete VALUES (34, 'aaa34'); INSERT INTO TABLE test_delete VALUES (35, 'aaa35'); hive> select * from test_delete; OK . Now when we say we have data in hive table it means two things: Basically, for the hive drop table to have the data, the data file is a prerequisite. Also the HiveServer2 Enable Impersonation is setting to TRUE. When you drop a table from Hive Metastore, it removes the table/column data and their metadata. Syntax:. 06:43 AM, Created You can only drop partitions which deletes directories in HDFS. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Here we discuss a brief overview with types of Drop Table in Hive along with Syntax respectively. Hive has a Internal and External tables. Drop or Delete Hive Partition Hive drop or delete partition is performed using ALTER TABLE tablename DROP command. 3. We have a hive table created over that HDFS file, and we load that HDFS file’s data into the hive table. TRUNCATE: used to truncate all the rows, which can not even be restored at all, this actions deletes data in Hive meta store. This page shows how to create, drop, and truncate Hive tables via Hive SQL (HQL). it looks like a permission issue which is silently ignored. @BildervicI’m afraid it is not clear what I am saying. The way of creating tables in the hive is very much similar to the way we create tables in SQL. When I have a table at my sqoop schema and want to delete it, I go to HIVE editor (through HUE)  and key in the following command DROP TABLE IF EXISTS schemaName.tblName PURGE; After that the table disappeared form the gui of HUE (sqoop table list, metastore list) but the actual files of the table were not deleted from the HDFS. as far as I know Impala does not support HDFS Impersonation . In this blog I will explain how to configure the hive to perform the ACID operation. SQL Delete Query: DELETE FROM pat_dtls_load WHERE sk IN (SELECT sk FROM new_pat_dtls_load WHERE NAME = 'Stuart') ; Hive Equivalent Delete statement using NOT … Let us re-write previous SQL delete statement using NOT EXISTS. 01:53 AM, @Tomas79  here is the  ACL of the hdfs path of the dir/table. 01:49 AM, Created But update delete in Hive is not automatic and you will need to enable certain properties to enable ACID operation in Hive. 32 aaa32 Internal Table is tightly coupled in nature.In this type of table, first we have to create table and load the data. In this article, we will see how to drop tables in the hive, what happens when the table is dropped and all things related to the drop table in the hive. DELETE : used to delete particular row with where condition and you can all delete all the rows from the given table. The keyword “DROP” refers to deletion. Created on No need to provide location, Hive default directory manages this data. I do not understand what this option is doing. “Drop table” command deletes the data permanently. Hive DELETE SQL query is used to delete the records from a table. Hive also takes optional WHERE clause and below are some points to remember using WHERE clause. Check the table is External or Internal. Time taken: 0.06 seconds, Fetched: 5 row(s) delete from test_delete where name = 'aaa33'; hive> select * from test_delete; OK . In this post, we are going to see how to perform the update and delete operations in Hive. 06:38 AM Using … Re: How to properly delete a hive table through HUE ? If it is an internal table then the table and data will complete delete. drop table table_name purge. Created By default, tables created in Hive are managed tables. I am writing this blog for, "How to Insert, Update and Delete records into a Hive table?" That is a sticky bit, every time you see it in the HDFS ACLs, it tells you that only the owner is able to drop directory, nobody else (even if write access is granted). Remove Duplicate Records from Hive Table. Create table. HiveMetastoreServer log I can't see anything about  permissions. I am going to make it easy and provide you with key points for both kinds of tables. 07:09 PM, Find answers, ask questions, and share your expertise. DELETE FROM tablename [WHERE expression] Important: Whenever Insertion, Deletion, and Updation operations are to be performed on Hive (with ACID support) table, starting with 0.14.0 and above, then the table property "transactional" must be set on the selected table, starting with Hive 0.14.0. The table we create in any database will be stored in the sub-directory of that database. You decide which type will suit your requirements. For data storage, HDFS (Hadoop Distributed File System) comes into the picture. You can consolidate below command in a shell script to execute. The following table contains the fields of employeetable and it shows the fields to be changed (in bold). Maybe you can check the hive server's log, if there is any kind of permission issue. If you are absolutely sure that the table needs to be permanently deleted then you can use PURGE. Above command synchronize zipcodes table on Hive Metastore. Hive manages all the security for managed tables. The table in the hive is consists of multiple columns and records. I can suceessfully drop hive table in hive … Can you explain me ? This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. Table Products contains the below data: Let’s see what happens when we drop this table: Now, if trying to retrieve the table’s data, It throws an error. Use DROP TABLE to drop a table, like any other RDBMS, dropping a table in hive drops the table description from Hive Metastore and it’s data from the Hive warehouse store (For internal tables). ‎08-06-2019 03:22 AM. Do alter table on all tables and change the external table to internal table then drop the table.. 06:03 AM. You can use the below command to drop the table. ‎08-06-2019 If the new table has a different schema from the existing table but the same name as the existing table, Hive will not warn you. I’m afraid it is not clear what I am saying. A table in Hive is a set of data that uses a schema to sort the data by given identifiers. How do I delete the Hive table data? Now run the show partition command which shows state=AL partition. With the help of the below command, all the content of the data table will be removed permanently... Command:. Created But when I have a table  which is owned to hive user and I am trying to delete it through hive editor (HUE) with the above command the table is disappeared from the gui but the files were not deleted. But there is a catch when using IF NOT EXISTS with a hive table. 31 aaa31 . Below are some of the methods that you can use. DROP DATABASE IF EXISTS HIVE_DATABASE_NAME CASCADE; In case, you are using older version of Hive: Drop all tables and views from hive database first, and then drop the database. ‎08-06-2019 12:36 AM. Check whether any Down Stream applications or using the Table. hive> DROP SCHEMA userdb; This clause was added in Hive 0.6. 07:14 AM. Created ‎08-09-2019 We do not have to provide the location manually while creating the table. To check if the existing table is managed or unmanaged, we could use the below command: Let us see the data presented in the table “codes”. I have a table which is owned to impala user. Can you please post the ACL's from the HDFS path, the root folder where the table is stored and the ACL's of the table path as well. It can be a normal table or an external table; Hive treats both in the same manner, irrespective of their types. You can make use of these keywords as a workaround to delete records from Hive tables. © 2020 - EDUCBA. When you will drop/delete the table form the hive database, the table entry will delete it from hive metastore. Drop Table Statement. In either way, you need to search for this permission issue in the logs. JDBC Program. hi @eMazarakis  as far as I know Impala does not support HDFS Impersonation . Created When I am dropping the table through impala editor (Hue) with the above command the table & hdfs files were deleted. External tables, we are required to provide the path where we need to store that table using the keyword ‘location’ in create table command. ‎08-09-2019 hive> insert overwrite table . select * from .; //insert overwrite the target table with tmp table. External and internal tables. Tables must… INSERT Command. I have a table which is owned to impala user. ‎08-06-2019 So in your case only the hive user can remove this directory. The syntax is as follows: DROP TABLE [IF EXISTS] table_name; From the other hand when I do the same thing at the impala editor everything works fine. Again, “describe formatted table_name” command. If there is no problem you can delete using DROP TABLE it will delete both Schema and Data Or else use Truncate it will keep your schema. - edited Hadoop, Data Science, Statistics & others. Not using a WHERE clause with DELETE statement, Hive delete all records from the table. (NOT WORKING) Note : In all the above cases, skipTrash is set in hive library. ]table_name (col_name data_type [COMMENT 'col_comment'],, ...) [COMMENT 'table_comment'] [ROW FORMAT row_format] [FIELDS TERMINATED BY char] [STORED AS file_format]; This chapter describes how to drop a table in Hive. Hive facilitates us to drop a table by using the SQL drop table command. Here is a code sample that will create a Hive table, show the metadata information from Hive, list the contents of the HDFS directory, delete, show HDFS directory info.
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