How do I create a dynamic partitioned table in hive?

Create a partition table. CREATE EXTERNAL TABLE EMP_PART (eid int, name string, position string) PARTITIONED BY (dept string); Set the dynamic partition mode to create partitioned directories of data dynamically when data is inserted. SET hive.

How do you load a hive table into a pig?

So, let’s make it first. First start hive CLI, then create and load data into table “profits” which is under bdp schema….Use below command to insert data into table profits:

1. INSERT INTO TABLE bdp.
2. (‘123′,’1365’),(‘124′,’3253’),(‘125′,’91522’),
3. (‘123′,’51842’),(‘127′,’19616’),(‘128′,’2433’),

How do I load data into a hive partitioned table?

Hive LOAD File from HDFS into Partitioned Table

1. Create another table without partition.
2. Load data into the table (Assume state is at first column).
3. Insert into the partitioned table by selecting columns from the non-partitioned table (make sure you select state at the end).

What are the 2 types of partitioning in hive?

Single insert to partition table is known as a dynamic partition. Usually, dynamic partition loads the data from the non-partitioned table. Dynamic Partition takes more time in loading data compared to static partition. When you have large data stored in a table then the Dynamic partition is suitable.

What is the difference between dynamic and static partition?

in static partitioning we need to specify the partition column value in each and every LOAD statement. dynamic partition allow us not to specify partition column value each time.

How dynamic partitions are added to a hive managed table?

In dynamic partitioning of hive table, the data is inserted into the respective partition dynamically without you having explicitly create the partitions on that table. When specifying the dynamic partition, keep in mind that you should not use high cardinality column as that will create lot of sub-directories.

How do I load data from HDFS to pig?

3 Answers

1. Create a folder in hdfs : hadoop fs -mkdir /pigdata.
2. Load the file to the created hdfs folder: hadoop fs -put /opt/pig/tutorial/data/excite-small. log /pigdata.

How will you insert data from non partitioned table to partitioned table in hive?

You can use this command to create that: hive> INSERT INTO TABLE Y PARTITION(state) SELECT * from X; Here you should ensure that the partition column is the last column of the non-partitioned table.

How do I add multiple partitions in Hive?

hive>alter table alt_part add partition(yop=2013,mop=9) location ‘/user/revathi-prac/partitions/dec21/yop=2013/mop=9’;

When should I use static partition in Hive?

Depending on how you load data you would need partitions. Usually when loading files (big files) into Hive tables static partitions are preferred. That saves your time in loading data compared to dynamic partition. You “statically” add a partition in table and move the file into the partition of the table.

How many types of partitions can be applied in the Hive?

If we take state column as partition key and perform partitions on that India data as a whole, we can able to get Number of partitions (38 partitions) which is equal to number of states (38) present in India.

How to partition data from HDFS to hive using pig?

Below is the output of the partitioning table, one can see data partition column also. We have taken sample data to load it into Pig, which would be further used to move into the Hive table. Enter into Pig with HCatalog option. Load the data into Pig relation ‘A’ from the HDFS path.

How to partition data from one table to another in hive?

– eventualy load the data from the first table to the second one using a query that will ” parse ” the timestamp column and extract what should be a suitable value for the partition column (for example the year or the year-and-the-month.). You don’t have to put the partition value in the insert statement if you enable dynamic partition in Hive.

How to take the date out of a hive table?

You can create hive external table to link to the data in HDFS, and then write data into another table which will be partitioned by date. Something like this. We have a timestamp in a table and we want o take date out of it then we can write a select statement to_date (timestamp column) from table name.

Is the timestamp column suitable for a hive partition?

The timestamp column is not “suitable” for a partition (unless you want thousands and thousand of partitions). – create a second Hive table for hosting the partitionned data (the same columns + the partition column),