Hive>use database; Hive>grant all on table table_name to role os_user_name with grant option; By this "os_user_name" only can able to access, other wont able to see the tables. Created 08-19-2016 12:20 PM. Your email address will not be published. ALTER TABLE SET command is used for setting the SERDE or SERDE properties in Hive tables. To learn more, see our tips on writing great answers. Do "the laws" mentioned in the U.S. Oath of Allegiance have to be constitutional? To automatically detect new partition directories added through Hive or HDFS operations: In Impala 2.3 and higher, the RECOVER PARTITIONS clause scans a partitioned table to detect if any new partition directories were added outside of Impala, such as by Hive ALTER TABLE statements or by hdfs dfs or hadoop fs commands. Required fields are marked *. However, I found a link to a workaround that involves a direct DB update to the Hive Metastore and simply moving the directory on HDFS. It has worked me at Hive permission level at USER. The ALTER DATABASE... SET LOCATION statement does not move the contents of the database's current directory to the newly specified location. Mostly ALTER can be used to alter database or schema properties and owner change. HIVE database does not exist SemanticException 10072, External Hive table from AVRO files says it has no data, Sqoop / Hive for CCA175: getting table AlreadyExistsException, Hive: modify external table's location take too long, cannot recognize input near database SET LOCATION in alter database statement in hive. Tables created before the alter will live in the previous location. Updating & Renaming Partitions in Hive Tables. This utility can be used to initialize Apache Atlas with databases/tables present in Apache Hive. 9,201 Views 2 Kudos Highlighted. As I am using MySQL, I will use MySQL query example here, change accordingly based on your DB type: DBS table, this table holds the information about Databases in Hive: The file operations need to perform manually corresponding physical filesystem operations. What's the map on Sheldon & Leonard's refrigerator of? rev 2021.3.12.38768, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. Currently you have JavaScript disabled. The HMS DB is configured in hive-site.xml file for HMS, so you can examine this configuration file to determine what’s the backend DB configurations. Your email address will not be published. View my verified achievement from @SnowflakeDB. hive> ALTER TABLE employee ADD COLUMNS ( > dept STRING COMMENT 'Department name'); JDBC Programm. It's simple usually to change/modify the exesting table use this syntax in Hive. How to point one Hive Table to Multiple External Files? Guru. https://cwiki.apache.org/confluence/display/Hive/Hive+Transactions For every successfully created database, the Alteration can be done as per the user requirement. We can. You can use simple create database database_name command to create database … You will also have to change the location of each of the existing tables using the above alter. I tried doing so, changed the name of the .db directory to the new database name and guess what, when I use the newly renamed database, use any table and run a select * query on it, it doesn’t return any value. Connect and share knowledge within a single location that is structured and easy to search. rename hive table ALTER TABLE tbl_nm RENAME TO new_tbl_nm; In the above statement the table name was changed from tbl_nm to new_tbl_nm. Save my name, email, and site URL in my browser for next time I post a comment. If a particular property was already set, this overrides the old value with the new one. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Table Operations such as Creation, Altering, and Dropping tables in Hive can be observed in this tutorial. My understanding of HIVE-1537 is that you will have to update the database location and manually move the files on HDFS. ALTER TABLE table_name CHANGE old_col_name new_col_name new_data_type Here you can change your column name and data type at a time. ALTER DATABASE in Hive The ALTER DATABASE statement in Hive is used to change the metadata associated with the database in Hive. I am able to access all the tables without any issues. Let's see the data of columns exists in the table. New tables will be put at the new location of the database. Creating table guru_sample with two column names such as "empid" and "empname". For the DB rename to work properly, we need to update three tables in the HMS DB. Firstly thanks for visiting my site and asking questions. Is there an engine evaluation technique that factors in 'time'? Alter Table. Alteration on the database is made to change its existing properties or characteristics. Mark as New; Bookmark; Subscribe; … Thank you for the steps. Hive provides us the functionality to perform Alteration on the Tables and Databases. The following table contains the fields of employeetable and it shows the fields to be changed (in bold). Sorry about the late response, I was on holiday in the last few weeks, and now just back to work. The syntax for Hive alter database statement is as follows: ALTER (DATABASE|SCHEMA) database_name SET DBPROPERTIES (property_name=property_value,...); The default database can not be altered in the Hive because it is restricted. With Databases, You can have logical separation of tables, table names, and even where data is going get store by default. https://t.co/9lmsA6lhRJ, Proud to see @SnowflakeDB on the #FCMostInnovative Companies list for 2021! We can alter the databases with Alter command in hive but it provides very minimal alterations. We can modify multiple numbers of properties associated with the table schema in the Hive. Not allowed to delete or unset the db properties which have been defined before. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. Scala Programming Features. If a diode has capacitance, why doesn't it block the circuit after some time? You can either drop the tables first or append the CASCADE keyword to the command, which will cause the Hive to drop the tables in the database first: hive> DROP DATABASE IF EXISTS financials CASCADE; Sci-fi film where an EMP device is used to disable an alien ship, and a huge robot rips through a gas station. Asking for help, clarification, or responding to other answers. Thus, databases are an implicit part of the Kudu table name. Doubts related to speed of sound in different mediums. In order to post comments, please make sure JavaScript and Cookies are enabled, and reload the page. ALTER DATABASE hql SET DBPROPERTIES('database usage'='Hive SQL tutorials. Only tables created after the alter will be put in the new location. Syntax--Set SERDE Propeties ALTER TABLE table_name [PARTITION part_spec] SET SERDEPROPERTIES (key1 = val1, key2 = val2,...) ALTER TABLE table_name [PARTITION part_spec] SET SERDE serde_class_name [WITH … The following queries rename the column name and column data type using the above data: Apache Atlas provides a command-line utility, import-hive.sh, to import metadata of Apache Hive databases and tables into Apache Atlas. Click here for instructions on how to enable JavaScript in your browser. Lets check it with an example. 1. Drop Table is used to Drop the table from a Hive database. By default, Hive won’t permit you to drop a database if it contains tables. myoung. thanks for trying to help, but what I am looking for is - if I have already created a database, and now I want to move it to a different directory in HDFS. In the Below screenshot, we are creating a table with columns and altering the table name. Not allowed to alter the directory location or database name. Here are the illustrated steps to change a custom database location, for instance "dummy.db", along with the contents of the database. In Hive, we can add one or more columns in an existing table by using the following signature: - Alter table table_name add columns (column_name datatype); Let's see the schema of the table. How long would it take for inbreeding issues to arise for a family that practiced inbreeding? May be what you told will not support in handling existing views. You might also want to check the table’s metadata “SELECT * FROM TBLS WHERE TBL_NAME = ‘{table_name}'” and confirm that the table’s metadata is correct. To allow me to help, can you please give me a bit more context on what is broken for VIEW? Using partition, it is easy to query a portion of the data. To rename a Table use ALTER TABLE command. How worried should I be about this cough? The database and schema are interchangeable. Is there a way to alter the location that a database points to? alter database; alter table (skewed table information, stored as, protection is not supported) alter view; Importing Hive Metadata. ALTER TABLE is a logical operation that updates the table metadata in the metastore database that shares with Hive. The database framework supports all the regular commands like create, drop, alter, use database. This article explains how to rename a database in Hive manually, ©2021 Hadoop Troubleshooting Guide - Eric's Blog, Impala nested inline view produces incorrect result when referencing the same column implicitly, Hive Dynamic Insert Query Only Uses 1 Reducer out of Thousands of Reducers. So, my question here is, wouldn’t I also will have to change the name of the directory under /app/hive/warehouse?? What do you roll to sleep in a hidden spot? Have you checked the Hive DB’s metadata information in your backend database? Can you tell the HMS db location as i was not able to found that in warehouse directory. ALTER Statement on HIVE Table. Is it more than one pound? @FastCompany recognizes how… https://t.co/KFiE79SGBT, Snowflake Guide New Post: TIMESTAMP Function Returns Different Results When Sorted By Different Direction https://t.co/c37Jq0qESo. Thanks for contributing an answer to Stack Overflow! This article explains how to rename a database in Hive manually without modifying database locations, as the command: ALTER DATABASE test_db RENAME TO test_db_new; still does not work due to HIVE-4847 is not fixed yet. See https://issues.apache.org/jira/browse/HIVE-1537 and https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-AlterTable/PartitionLocation for details regarding database and table locations. How can that be achieved ? This developer built a…, Create HIVE partitioned table HDFS location assistance. In the Hive, the database framework is developed by Facebook to analyze structured data or semi-structured data. http://gaganonthenet.com/2015/02/23/hive-change-location-for-database-or-schema/. New tables will be put at the new location of the database. With Alter table command, we can also update partition table location. Der JDBC-Programm, um eine Spalte zu einer Tabelle hinzufügen ist unten angegeben. Now, I want to rename the database. ALTER TABLE command can be used to perform alterations on the tables. ALTER TABLE does not actually rewrite, move, etc, on the actual data files. Or if you use Cloudera Manager, you can go to CM home page > Hive > Configuration > search for “database” and you can see the host, username etc, but password will not be visible, you will need to check with your system admin. Assign any new (key, value) pairs into DBPROPERTIES; Set owner user or role to the Database; But below are its limitations. After some trial and error, I learned Hive does not support the following two conditions when running an ALTER on a database. There are few views which are not working after updating the database name as they are still looking for the old database name. Join Stack Overflow to learn, share knowledge, and build your career. ALTER SCHEMA was added in Hive 0.14 (HIVE-6601). Instead, a new convention has been introduced that Kudu table names must be in the format
.. See my updated answer, the previous one I had was incorrect and would not work. Re: Setting a permission in hive databases. Hide the source code for an Automator quick action / service. http://gaganonthenet.com/2015/02/23/hive-change-location-for-database-or-schema/, https://issues.apache.org/jira/browse/HIVE-1537, https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-AlterTable/PartitionLocation, State of the Stack: a new quarterly update on community and product, Podcast 320: Covid vaccine websites are frustrating. The RECOVER PARTITIONS clause automatically recognizes any data … jdbc:hive2://>DROP TABLE employee2; jdbc:hive2://>DROP TABLE emp.employee2; jdbc:hive2://>DROP TABLE IF EXISTS employee2 PURGE; Conclusion .