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You're reading from  Apache Hive Essentials

Product typeBook
Published inFeb 2015
Reading LevelIntermediate
PublisherPackt
ISBN-139781783558575
Edition1st Edition
Languages
SQL
Tools
HiveHadoop
Concepts
Data Processing
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Author (1)
Dayong Du
Dayong Du
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Dayong Du

Dayong Du has all his career dedicated to enterprise data and analytics for more than 10 years, especially on enterprise use case with open source big data technology, such as Hadoop, Hive, HBase, Spark, etc. Dayong is a big data practitioner as well as author and coach. He has published the 1st and 2nd edition of Apache Hive Essential and coached lots of people who are interested to learn and use big data technology. In addition, he is a seasonal blogger, contributor, and advisor for big data start-ups, co-founder of Toronto big data professional association.
Read more about Dayong Du

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Performance utilities

Hive provides the EXPLAIN and ANALYZE statements that can be used as utilities to check and identify the performance of queries.

The EXPLAIN statement

Hive provides an EXPLAIN command to return a query execution plan without running the query. We can use an EXPLAIN command for queries if we have a doubt or a concern about performance. The EXPLAIN command will help to see the difference between two or more queries for the same purpose. The syntax for EXPLAIN is as follows:

EXPLAIN [EXTENDED|DEPENDENCY|AUTHORIZATION] hive_query

The following keywords can be used:

  • EXTENDED: This provides additional information for the operators in the plan, such as file pathname and abstract syntax tree.

  • DEPENDENCY: This provides a JSON format output that contains a list of tables and partitions that the query depends on. It is available since HIVE 0.10.0.

  • AUTHORIZATION: This lists all entities needed to be authorized including input and output to run the Hive query and authorization failures...

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Apache Hive Essentials
Published in: Feb 2015Publisher: PacktISBN-13: 9781783558575
© 2015 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Dayong Du

Dayong Du has all his career dedicated to enterprise data and analytics for more than 10 years, especially on enterprise use case with open source big data technology, such as Hadoop, Hive, HBase, Spark, etc. Dayong is a big data practitioner as well as author and coach. He has published the 1st and 2nd edition of Apache Hive Essential and coached lots of people who are interested to learn and use big data technology. In addition, he is a seasonal blogger, contributor, and advisor for big data start-ups, co-founder of Toronto big data professional association.
Read more about Dayong Du

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