如何杀死我所有的postgresql连接?
我试着耙db:下降，但我得到:
ERROR: database "database_name" is being accessed by other users
DETAIL: There are 1 other session(s) using the database.
我尝试过关闭我从ps -ef | grep postgres中看到的进程，但这也不起作用:
kill: kill 2358 failed: operation not permitted
当前回答
MacOS，如果postgresql安装了brew:
brew services restart postgresql
删除postgresql会话/连接
其他回答
我在mac上，通过postgress。app使用postgres。我解决了这个问题，只是退出，重新开始应用程序。
如果你需要断开一个特定用户的会话，这有助于我:
检查当前所有连接:
select * from pg_stat_activity;
授予你的用户一个角色(不重要):
set role "db_admin";
杀死届:
select pg_terminate_backend(pid)
from pg_stat_activity
where usename = '*** USER NAME TO DISCONNECT ***';
没有必要放弃。只需删除并重新创建公共模式。在大多数情况下，这有完全相同的效果。
namespace :db do
desc 'Clear the database'
task :clear_db => :environment do |t,args|
ActiveRecord::Base.establish_connection
ActiveRecord::Base.connection.tables.each do |table|
next if table == 'schema_migrations'
ActiveRecord::Base.connection.execute("TRUNCATE #{table}")
end
end
desc 'Delete all tables (but not the database)'
task :drop_schema => :environment do |t,args|
ActiveRecord::Base.establish_connection
ActiveRecord::Base.connection.execute("DROP SCHEMA public CASCADE")
ActiveRecord::Base.connection.execute("CREATE SCHEMA public")
ActiveRecord::Base.connection.execute("GRANT ALL ON SCHEMA public TO postgres")
ActiveRecord::Base.connection.execute("GRANT ALL ON SCHEMA public TO public")
ActiveRecord::Base.connection.execute("COMMENT ON SCHEMA public IS 'standard public schema'")
end
desc 'Recreate the database and seed'
task :redo_db => :environment do |t,args|
# Executes the dependencies, but only once
Rake::Task["db:drop_schema"].invoke
Rake::Task["db:migrate"].invoke
Rake::Task["db:migrate:status"].invoke
Rake::Task["db:structure:dump"].invoke
Rake::Task["db:seed"].invoke
end
end
可以使用pg_terminate_backend()终止连接。你必须是超级用户才能使用这个功能。这在所有操作系统上都是一样的。
SELECT
pg_terminate_backend(pid)
FROM
pg_stat_activity
WHERE
-- don't kill my own connection!
pid <> pg_backend_pid()
-- don't kill the connections to other databases
AND datname = 'database_name'
;
在执行这个查询之前，你必须撤销CONNECT权限以避免新的连接:
REVOKE CONNECT ON DATABASE dbname FROM PUBLIC, username;
如果你正在使用Postgres 8.4-9.1，请使用procpid而不是pid
SELECT
pg_terminate_backend(procpid)
FROM
pg_stat_activity
WHERE
-- don't kill my own connection!
procpid <> pg_backend_pid()
-- don't kill the connections to other databases
AND datname = 'database_name'
;
OSX, Postgres 9.2(已安装自制程序)
$ launchctl unload -w ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
$ pg_ctl restart -D /usr/local/var/postgres
$ launchctl load -w ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
如果你的datadir在其他地方，你可以通过检查ps aux | grep postgres的输出来找到它
