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Hive >> mail # user >> ORC vs TEXT file


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Re: ORC vs TEXT file
Thanks Owen and Hongzhan.
I understand the behavior now.
On Tue, Aug 13, 2013 at 6:28 AM, hongzhan li <[EMAIL PROTECTED]>wrote:

> if you select all the columns ,the orc will not faster than textfile.but
> if you select some column (not all of the colimns),orc will run faster.
> —
>
>
> On Mon, Aug 12, 2013 at 6:40 PM, pandees waran <[EMAIL PROTECTED]> wrote:
>
>> Hi,
>>
>> Currently, we use TEXTFILE format in hive 0.8 ,while creating the
>> external tables in intermediate processing .
>> I have read about ORC in 0.11. I have created the same table in 0.11
>> with ORC format.
>> Without any compression, the ORC file(totally 3 files) occupied the
>> space twice more than the TEXTFILE(only one file).
>> Even, when i query the data from ORC:
>> Select count(*) from orc_table
>>
>> It took more time than the same query against textfile.
>> But, i see cumulative CPU time is lesser in ORC than the text file.
>>
>> What sort of queries will benefit, if we use ORC?
>> In which cases TEXTFILE will be preferred more than ORC?
>>
>> Thanks.
>>
>
>
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Thanks,
Pandeeswaran