Month: March 2023

When inserting data into partitioned tables in Hive, there are two modes to consider: static and dynamic partitioning. Dynamic partitioning allows Hive to automatically determine the partition for each row based on the values in the data being inserted, making it a more flexible and efficient method for inserting large amounts of data into a …

Section 8:81.Inserting Data into Partitioned Tables -Using dynamic Partition mode Read More »

Inserting partitions, on the other hand, refers to the process of adding new partitions to a partitioned table. This is done using the INSERT INTO command and specifying the partition columns for the new data. Hive will then create the new partition directories on HDFS and move the data into the appropriate location. But Loading …

 Section 8:80.Inserting Data into Partitions in Hive Tables Read More »

If you Load the data directly to the hive table it throws the error To load the partitions in Hive Tables , follow these steps: Make the directory with the name orders and using grep redirect the data to orders_201307 Load the data to partitioned table order_part partitioned by month July 2013

To add partitions to a Hive table, you can use the ALTER TABLE statement with the ADD PARTITION clause. The ADD PARTITION clause allows you to create a new partition and specify its partition column values. Here’s an example: Suppose you have a sales table partitioned by year and month, and you want to add …

Section 8:78.Adding Partitions to Tables in Hive Read More »

Partitioning in Hive is a technique for dividing large tables into smaller, more manageable parts based on specific column values. Partitioning can improve query performance and reduce data processing time by allowing the system to scan only the relevant data rather than scanning the entire table. To partition a table in Hive, follow these steps: …

Section 8:77.Creating Partitioned table in Hive – order_part with       order_month as key Read More »

In Hive, you can use a stage table to insert data into a target table. A stage table is a temporary table that you create to hold the data that you want to insert into the target table. You can then use the INSERT INTO statement to insert the data from the stage table into …

Section 8:75.Inserting Data into order_items using stage table Read More »