Table of Contents
How do I connect to a Hive database?
Create a Connection to Hive Data
- In the Databases menu, click New Connection.
- In the Create new connection wizard that results, select the driver.
- On the next page of the wizard, click the driver properties tab.
- Enter values for authentication credentials and other properties required to connect to Hive.
What happens when a query is submitted in Hive?
Hive Compiler Hive compiler parses the query. It performs semantic analysis and type-checking on the different query blocks and query expressions by using the metadata stored in metastore and generates an execution plan.
How do I run a Hive query from a file?
How to Run Hive Scripts?
- Step 1: Writing a Hive script. To write the Hive Script the file should be saved with . sql extension.
- Step 2: Running the Hive Script. The following is the command to run the Hive script: Command: hive –f /home/cloudera/sample.sql.
Is there any UI for Hive?
The Hive Web Interface is an alternative to using the Hive command line interface. Using the web interface is a great way to get started with Hive. The Hive Web Interface, abbreviated as HWI, is a simple graphical user interface (GUI). HWI is only available in Hive releases prior to 2.2.
How do I find my hive connection URL?
Configuration Required -> PXF JDBC Connector or Hive configuration required for User Identity….JDBC Server Configuration.
| Property | Value |
|---|---|
| jdbc.driver | org.apache.hive.jdbc.HiveDriver |
| jdbc.url | jdbc:hive2://:/ |
How do I connect to hive from command line?
To connect to Hive running on remote cluster, just pass the IP address and Port on JDBC connection string. By not providing a username and password, it prompts for the credentials to enter. In case if you are running on LOCAL, you can also try with the localhost, hostname, or 127.0. 0.1 instead of remote IP address.
How do you optimize a hive query?
Below are the list of practices that we can follow to optimize Hive Queries.
- Enable Compression in Hive.
- Optimize Joins.
- Avoid Global Sorting in Hive.
- Enable Tez Execution Engine.
- Optimize LIMIT operator.
- Enable Parallel Execution.
- Enable Mapreduce Strict Mode.
- Single Reduce for Multi Group BY.
What is the default join in hive?
equi joins
1 Answer. Hive supports equi joins by default. You can optimize your join by using Map-side Join or a Merge Join depending upon the size and sort order of your tables.
How do I run a Hql file with Beeline?
The -i parameter starts Beeline and runs the statements in the query. hql file….Run a HiveQL file.
| Statement | Description |
|---|---|
| INSERT OVERWRITE SELECT | Selects rows from the log4jLogs table that contain [ERROR], then inserts the data into the errorLogs table. |
How do I get the Hive app on my Smartphone?
How do I get the Hive app on my smartphone? 1 Open your device’s settings. 2 Tap About Phone or About Device. 3 Tap Android Version to display your version information.
Why can’t I see the column names in a hive query?
Whenever we execute a query in the Hive shell, we can see the relevant results on screen but we cannot recognise the column names corresponding to the data unless we do a “desc formatted table_name” or any other similar command and scroll up / down the screen to match the results with the table structure. We do this all the time most probably.
How to pass results from hue to hive script?
Use shell wrapper script to get result into variable and pass it to your Hive script. Whilst it’s not possible to do exactly what you want from Hue — a constant source of frustration for me — if you are restricted to Hue, and can’t use a shell wrapper as suggested above, there are workarounds depending on the scenario.
How to get result from a variable in a hive script?
Hive substitutes variables as is and does not execute them. Use shell wrapper script to get result into variable and pass it to your Hive script.