hive的储存格式

hive的存储格式

hive有textFile,SequenceFile,RCFile三种文件格式。

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其中textfile为默认格式，建表时不指定默认为这个格式，导入数据时会直接把数据文件拷贝到hdfs上不进行处理。

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SequenceFile,RCFile格式的表不能直接从本地文件导入数据，数据要先导入到textfile格式的表中，然后再从textfile表中用insert导入到SequenceFile,RCFile表中。

写道create table zone0000tf(ra int, dec int, mag int) row format delimited fields terminated by '|';
create table zone0000rc(ra int, dec int, mag int) row format delimited fields terminated by '|' stored as rcfile;

load data local inpath '/home/cq/usnoa/zone0000.asc ' into table zone0000tf;
insert overwrite table zone0000rc select * from zone0000tf;(begin a job)

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File Format

TextFile

SequenceFIle

RCFFile

Data type

Text Only

Text/Binary

Text/Binary

Internal Storage Order

Row-based

Row-based

Column-based

Compression

File Based

Block Based

Block Based

Splitable

YES

YES

YES

Splitable After Compression

No

YES

YES

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