Thanks for your response Fabio.
>>
Since the select queries has $ parameters, I could not able to do the EXPLAIN ANALYZE on that for example the select query is like below.
SELECT ... in ($3, $4, $5, $6)
>> PostgreSQL version 10, runs in CENTOS 7.2 with 64 GB of RAM. The table has only "character varying" and "numeric" as data type
-Dhandapani.