Dear Friends, I have a table with 50 lakhs records, the table has more then 10 fields, i have primary key, i have select query with count(*) without any condition, it takes 17 seconds.
I have another one query which will do joins with other small tables, it takes 47 seconds to give output, the result has 2 lakhs records. the indexing is not used. I have created one index with one field ( which i used in this query, the field value has duplicates also ).
Now the cpu usage is 4.4%, and waiting for io process .
i have checked the above in the top command.
If i delete that index, then it works fine, now the cpu usage takes more then 70%, and waiting shows less then 30%.
Can Anyone explain, Why postgres behaves like this.