12-18-2015 Creating a Hive table is similar like creating a table in SQL like databases. In both cases, the SHOW STATS command outputs two types of rows. Go to Hive shell by giving the command sudo hive and enter the command create database to create the new database in the Hive. 02-03-2016 I think describe extended shows only table stats. For general information about Hive statistics, seeStatistics in Hive. command to gather statistics and write them into Hive MetaStore. DESCRIBE and DESCRIBE EXTENDED statements can be used for views like for tables, however, for DESCRIBE EXTENDED, the detailed table information has a variable named typeable which has value = virtual view for views. 06:56 PM. These are described below: As we can see, both of the available approaches have major gaps. Issue a SHOW CREATE TABLE command on your Hive command line to see Created 06-30-2017 hive> show table stats How to start HiveServer2 and using Beeline Difference between Internal Managed Table and External Table the input format and output format. created tables and/or partition, utomatically computed by default. This command shows meta data about the hive table which includes list of columns,data types and location of the table.There are three ways to describe a table in Hive. To list all available properties, run the following query: SELECT * FROM system.metadata.analyze_properties This document describes changes to a) HiveQL, b) metastore schema, and c) metastore Thrift API to support column level statistics in Hive. I've got a working example at https://github.com/lestermartin/oss-transform-processing-comparison/tree/master/profiling#hive that shows column stats. SHOW TABLE_STATISTICS Description. 02:33 AM. Viewing Hive Column or Table level Statistics, Re: Viewing Hive Column or Table level Statistics, http://hortonworks.com/blog/5-ways-make-hive-queries-run-faster/. The same command could be used to compute statistics for one or more column of a Hive table or partition. Statistics such as the number of rows of a table or partition and the histograms of a particular interesting column are important in many ways. The Apache Hive Statisticswiki page contains a good background on the list of statistics that can be computed and stored in the Hive metastore. Created such as top 10 product sold, age distribution in person table etc. Switch to the different database/schema using use database_name in this case: USE datalab_network, you will be able to see the tables. There is nothing like SHOW VIEWS in Hive. Hive will collect table stats when set hive.stats.autogather=true during the INSERT OVERWRITE command. Note: Because many of the most performance-critical and resource-intensive operations rely on table and column statistics to construct accurate and efficient plans, COMPUTE STATS is an important step at the end of your ETL process. For more info see https://hortonworks.com/blog/3-great-reasons-to-try-hive-view-2-0/. table_name: A table name, optionally qualified with a database name. the tables listed above are the tables of the 'default' database / schema. Sitemap, Amazon Redshift CONCAT Function-Syntax and Examples. See this thread here: https://community.hortonworks.com/questions/4759/hive-explain-says-plan-not-optimized-by-cbo-due-to. We couldn't find a way to see "columns" stats (analyze table t compute statistics for columns). SHOW TABLE EXTENDED (SQL Analytics) Shows information for all tables matching the given regular expression. Analyzing a table (also known as computing statistics) is a built-in Hive operation that you can execute to collect metadata on your table. I have both Enterprise Guide (8.1) and Display Manager available to me, but I typically use EG. I'm connecting to a Hadoop database. Note that /.stats.drill is the directory to which the JSON file with statistics is written.. Usage Notes. For information about top K statistics, seeColumn Level Top K Statistics.