杀死postgresql会话/连接

Question

如何杀死所有postgresql连接？

我正在尝试rake db:drop但是我得到了:

ERROR:  database "database_name" is being accessed by other users
DETAIL:  There are 1 other session(s) using the database.

我已经尝试关闭我从a看到的进程,ps -ef | grep postgres但这也不起作用:

kill: kill 2358 failed: operation not permitted

Answer 1

您可以使用pg_terminate_backend()来终止连接.您必须是超级用户才能使用此功能.这适用于所有操作系统.

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'
    ;

执行这个查询之前,你必须REVOKE的CONNECT权限,以避免新的连接:

REVOKE CONNECT ON DATABASE dbname FROM PUBLIC, username;

如果您使用的是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'
    ;

Answer 2

也许只是重启postgres=>sudo service postgresql restart

Answer 3

有关运行过程的所有信息:

SELECT *, pg_terminate_backend(pid)
FROM pg_stat_activity 
WHERE pid <> pg_backend_pid()
AND datname = 'my_database_name';

Answer 4

MacOS,如果postgresql是用brew安装的:

brew services restart postgresql

来源:杀死postgresql会话/连接

Answer 5

如果您需要断开特定用户的会话，这对我有帮助：

检查当前所有连接：

select * from pg_stat_activity; 

向您的用户授予角色（不重要）：

set role "db_admin";

杀死会话：

select pg_terminate_backend(pid)
from pg_stat_activity
where usename = '*** USER NAME TO DISCONNECT ***';

Answer 6

OSX,Postgres 9.2(随自制软件一起安装)

$ 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在别处你可以通过检查输出来找出它的位置 ps aux | grep postgres

Answer 7

更简单和更新的方法是：

1. 使用ps -ef | grep postgres查找连接＃
2. sudo kill -9 "#" 连接的

注意：可能有相同的PID。杀一个就是杀所有。

Answer 8

这似乎适用于PostgreSQL 9.1:

#{Rails.root}/lib/tasks/databases.rake
# monkey patch ActiveRecord to avoid There are n other session(s) using the database.
def drop_database(config)
  case config['adapter']
  when /mysql/
    ActiveRecord::Base.establish_connection(config)
    ActiveRecord::Base.connection.drop_database config['database']
  when /sqlite/
    require 'pathname'
    path = Pathname.new(config['database'])
    file = path.absolute? ? path.to_s : File.join(Rails.root, path)

    FileUtils.rm(file)
  when /postgresql/
    ActiveRecord::Base.establish_connection(config.merge('database' => 'postgres', 'schema_search_path' => 'public'))
    ActiveRecord::Base.connection.select_all("select * from pg_stat_activity order by procpid;").each do |x|
      if config['database'] == x['datname'] && x['current_query'] =~ /<IDLE>/
        ActiveRecord::Base.connection.execute("select pg_terminate_backend(#{x['procpid']})")
      end
    end
    ActiveRecord::Base.connection.drop_database config['database']
  end
end

从这里和这里发现的要点中解脱出来.

这是一个适用于PostgreSQL 9.1和9.2 的修改版本.

Answer 9

MacOS，如果 postgresql 是随brew一起安装的：

brew services restart postgresql

乌本图，

首先检查一下（杀死在后台运行的服务器）

sudo kill -9 $(lsof -i :3000 -t)

如果你没有找到 pid 那么你只需要通过命令重新启动 Postgresql 服务，如下所示：

sudo service postgresql restart

Answer 10

SELECT 
pg_terminate_backend(pid) 
FROM 
pg_stat_activity 
WHERE
pid <> pg_backend_pid()
-- no need to kill connections to other databases
AND datname = current_database();
-- use current_database by opening right query tool

Answer 11

我使用以下rake任务来覆盖Rails drop_database方法.

lib/database.rake

require 'active_record/connection_adapters/postgresql_adapter'
module ActiveRecord
  module ConnectionAdapters
    class PostgreSQLAdapter < AbstractAdapter
      def drop_database(name)
        raise "Nah, I won't drop the production database" if Rails.env.production?
        execute <<-SQL
          UPDATE pg_catalog.pg_database
          SET datallowconn=false WHERE datname='#{name}'
        SQL

        execute <<-SQL
          SELECT pg_terminate_backend(pg_stat_activity.pid)
          FROM pg_stat_activity
          WHERE pg_stat_activity.datname = '#{name}';
        SQL
        execute "DROP DATABASE IF EXISTS #{quote_table_name(name)}"
      end
    end
  end
end

编辑:这适用于Postgresql 9.2+

Answer 12

我是这样解决的：

在我的Windows8 64位中，只需restarting 服务：postgresql-x64-9.5