>
>
> What is a similar tool for Postgresql? I need a free tool.
>
There are no such free/community tools I am aware of .You could look at
EnterpriseDB products.
>
> Moreover in Oracle to check sessions I use some reports:
> awr
> addm
> ash
>
> Have a look at reports from pgbadger( https://github.com/dalibo/pgbadger)
. The reports are similar, though they aren't as exhaustive as awr/addm/ash.
Regards,
Jayadevan