PL/SQL – Usefull queries

This is the place where some uncategorized, but usefull queries will be published:

select * from v$version; -- displays version of the database engine
select * from user_tables; -- lists all tables of current user 
select * from user_objects; -- lists all user objects (like tables, sequences, indices, ...)
select * from user_tab_cols; -- list of all columns in user's tables
describe hr.countries -- show the table columns and types
SELECT * FROM v$sqlarea order by last_load_time desc -- lists last executed sql quries
select * from V$SESSION_LONGOPS -- lists long running queries
select * from V$SESSION -- current connections
ALTER SYSTEM KILL SESSION 'sid,serial#' -- kill session
select * from dba_source -- db packages sourcecode


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