thank you for your answer by the way this is explain commands out:
EXPLAIN select AVG(dryBulbTempF) FROM testindex WHERE ndate = '20070710';
OK
STAGE DEPENDENCIES:
Stage-1 is a root stage
Stage-0 depends on stages: Stage-1
STAGE PLANS:
Stage: Stage-1
Map Reduce
Map Operator Tree:
Long answer
An EXTERNAL TABLE in hive is a stub for table in Hive metastore. Data is
not managed by Hive and it is an HDFS concern.
For that reason if you drop an EXTERNAL table in Hive you just drop
references for that table in Hive metastore. Data is not deleted.
The conventional indexes
Because I have many clusters and I want to manage all these clusters' meta data
with one metastore, and make the clusters' meta data isolated from each other.
Maybe I could create a hive JIRA. Thank you all the same.
发件人: Peter Vary
发送时间:
Have you checked running SQL with
EXPLAIN EXTENDED SELECT ..
And post the results.
In general your compact index will not work
HTH
Dr Mich Talebzadeh
LinkedIn *
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Hi guys,
I created table and index on this table. Also after I alter that index with
rebuild option. But still can't see performance improvements.
Only, I can see performance improvements when I query to index table.
I used following commands :
CREATE EXTERNAL TABLE testindex(wban INT, ndate
Hi,
I am trying to connect to hiveserver2 from python, and i have tried steps
as mentioned here : https://cwiki.apache.org/confluence/display/Hive/
Setting+Up+HiveServer2#SettingUpHiveServer2-PythonClientDriver.
I am not able to connect to it.
I was getting sasl issues, so i changed the