Oracle:
select * from v$session (全部详细信息)
select username,count(username) from v$session where username is not null group by username (用户不为空的)
PostgreSQL:
select * from pg_stat_activity where client_addr='127.0.0.1' (全部详细信息)
sql--查询数据库的连接数
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转载自peihong-ph.iteye.com/blog/1883721
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