hive 动态分区及load和insert用法

hive load用法：
load data local inpath '/home/data/stg_activity_antirush_apply.txt' 
overwrite into table stg_activity_antirush_apply;  
关键字local 不加数据从hdfs上加载，如果加local数据从本地加载；
关键字overwrite 为覆盖加载，会覆盖掉原有的数据；
动态分区设置

也可以在配置文件中修改
--SET hive.exec.dynamic.partition=true;  
--SET hive.exec.dynamic.partition.mode=nonstrict;  
--SET hive.exec.max.dynamic.partitions.pernode = 1000;  
--SET hive.exec.max.dynamic.partitions=1000;

    hive.exec.dynamic.partition
    true
    Whether or not to allow dynamic partitions in DML/DDL.
 
 
    hive.exec.dynamic.partition.mode
    nonstrict
   
      In strict mode, the user must specify at least one static partition
      in case the user accidentally overwrites all partitions.
      In nonstrict mode all partitions are allowed to be dynamic.
   
 
 
    hive.exec.max.dynamic.partitions
    100000
    Maximum number of dynamic partitions allowed to be created in total.
 
 
    hive.exec.max.dynamic.partitions.pernode
    10000
    Maximum number of dynamic partitions allowed to be created in each mapper/reducer node.
 
 
    hive.exec.max.created.files
    100000
    Maximum number of HDFS files created by all mappers/reducers in a MapReduce job.
 
  
  
  
insert overwrite table dw_activity_antirush_apply PARTITION(DateID = ${etlDate}) --手动分区
select * from tablename;

insert into table dw_activity_antirush_apply PARTITION(DateID = ${etlDate}) --手动分区
select * from tablename;

insert overwrite table dw_activity_antirush_apply PARTITION(DateID) --动态分区
select *, column_name as dateid from tablename;

INSERT OVERWRITE会覆盖表或分区中已存在的数据
INSERT INTO以追加数据的方式插入到表或分区，原有数据不会删除
Insert可以插入表或分区，如果表是分区表，则Insert时需要指定插入到哪个分区