Postgres grant select access on all tables in a database

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Postgres processlist and locks

Processlist
select * from pg_stat_activity;

Exclude IDLE processes
select * from pg_stat_activity WHERE current_query not like '<IDLE>%';

Current running queries
select current_query,count(*) from pg_stat_activity WHERE current_query not like '<IDLE>%' group by current_query order by count(*) desc;

Queries holding Exclusive locks
select * from pg_stat_activity where procpid in(select pid from pg_locks where mode='ExclusiveLock');
select pid,count(*) from pg_locks where mode='ExclusiveLock' group by pid order by count(*) desc;

Kill a running query
SELECT pg_cancel_backend(procpid); 

Connecting to a oracle database without tnsnames

Here are the examples to connect using sqlplus to an oracle database without adding any tnsnames entry.


sqlplus scott/tiger@//10.103.18.99:1560/practicedb

If it does not work try this too

connect scott/tiger@(DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 10.103.18.99)(PORT = 1560))) (CONNECT_DATA = (SID = practicedb)))