select count query taking more time

[#1]

Doing select count on table having 3 lac/more records takes more than 5 mins. Is there any tuning document for hive we can refer to optimize query performance ?

[#2]

@Ashnee Sharma

Can you please set hive.support.concurrency=false and

then try to run select count(*) from rasdb.test;

[#3]

@srinivasa rao

I have tried with following properties

1. set hive.compute.query.using.stats=true;
2. set hive.stats.fetch.column.stats=true;
3. set hive.stats.fetch.partition.stats=true;
4. set hive.fetch.task.conversion=more;
5. set hive.support.concurrency=false

it is taking 3 min. for count.