1.啟動impala
[root@hadoop102 ~
]# impala-shell
[hadoop102:
21000
]> show databases;
[hadoop102:
21000
]> use default;
[hadoop102:
21000
]> show tables;
[hadoop102:
21000
]> create table student
(id int, name string)
> row format delimited
> fields terminated by '\t'
;
[hadoop103:
21000
]> load data inpath '/student.txt' into table student;
[hdfs@hadoop103 ~
]$ hadoop fs -chmod -r 777
/
7.查詢
[hadoop103:
21000
]> select * from student;
[hadoop103:
21000
]> quit;
1.連線指定hadoop103的impala主機
[root@hadoop102 datas]# impala-shell -i hadoop103[hdfs@hadoop103 ~
]$ impala-shell -q 'select * from student'
-o output.txt
[hdfs@hadoop103 ~
]$ vim impala.sql
select * from student;
select * from stu;
select * from student;
[hdfs@hadoop103 ~
]$ impala-shell -f impala.sql;
[hdfs@hadoop103 ~
]$ impala-shell -c -f impala.sql;
hive> create table stu
(id int, name string)
;[hadoop103:
21000
]> show tables;
query: show tables+--
-------
+| name |+--
-------
+| student |+--
-------
+[hdfs@hadoop103 ~
]$ impala-shell -r
[hadoop103:
21000
]> show tables;
query: show tables+--
-------
+| name |+--
-------
+| stu |
| student |+--
-------
+
[hdfs@hadoop103 ~
]$ impala-shell -p
[hadoop103:
21000
]> select * from student;
[root@hadoop103 ~
]# impala-shell -q 'select * from student'
-b --output_delimiter=
"\t"
-o output.txt
[root@hadoop103 ~
]# cat output.txt
1001 tignitgn
1002 yuanyuan
1003 haohao
1004 yunyun
1.檢視執行計畫
explain select * from student;[hadoop103:
21000
]> select count(*
) from student;
[hadoop103:
21000
]> profile;
[hadoop103:
21000
]> shell hadoop fs -ls /
;[hadoop103:
21000
]> shell ls -al .
/;
hive> load data local inpath '/opt/module/datas/student.txt' into table student;
[hadoop103:
21000
]> select * from student;
[hadoop103:
21000
]> refresh student;
[hadoop103:
21000
]> select * from student;
[hadoop103:
21000
]> history；
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