June 2018
Beginner to intermediate
210 pages
5h 12m
English
Content preview from Apache Hive Essentials - Second Edition
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ANALYZE statement
Hive statistics are a collection of data that describes more details, such as the number of rows, number of files, and raw data size of the objects in the database. Statistics are the metadata of data, collected and stored in the metastore database. Hive supports statistics at the table, partition, and column level. These statistics serve as an input to the Hive Cost-Based Optimizer (CBO), which is an optimizer used to pick the query plan with the lowest cost in terms of system resources required to complete the query. The statistics are partially gathered automatically in Hive v3.2.0 through to JIRA HIVE-11160 (https://issues.apache.org/jira/browse/HIVE-11160) or manually through the ANALYZE statement on tables, partitions, ...
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