tpcds-datagen-as-hive-query

Generate TPCDS data using hive query

##How to use

1. Clone this repo.

   git clone https://github.com/dharmeshkakadia/tpcds-datagen-as-hive-query/ && cd tpcds-datagen-as-hive-query

2. Run TPCHDataGen.hql with settings.hql file and set the required config variables.

   hive -i settings.hql -f TPCDSDataGen.hql -hiveconf SCALE=10 -hiveconf PARTS=10 -hiveconf LOCATION=/HiveTPCDS/ -hiveconf TPCHBIN=resources 

   Here, SCALE is a scale factor for TPCDS, PARTS is a number of task to use for datagen (parrellelization), LOCATION is the directory where the data will be stored on HDFS, TPCHBIN is where the resources are found. You can specify specific settings in settings.hql file.

3. Now you can create tables on the generated data.

   hive -i settings.hql -f ddl/createAllExternalTables.hql -hiveconf LOCATION=/HiveTPCDS/ -hiveconf DBNAME=tpcds

   Generate ORC tables and analyze

   hive -i settings.hql -f ddl/createAllORCTables.hql -hiveconf ORCDBNAME=tpcds_orc -hiveconf SOURCE=tpcds
   hive -i settings.hql -f ddl/analyze.hql -hiveconf ORCDBNAME=tpcds_orc 

4. Run the queries !

   hive -database tpcds_orc -i settings.hql -f queries/query12.sql