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
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。
其他回答
案例: 查询执行失败:
DROP TABLE dbo.t_tabelname
解决方案: a.显示查询状态活动如下:
SELECT * FROM pg_stat_activity ;
b.查找“查询”列包含的行:
'DROP TABLE dbo.t_tabelname'
c.在同一行中，获取“PID”列的值
example : 16409
d.执行以下脚本:
SELECT
pg_terminate_backend(25263)
FROM
pg_stat_activity
WHERE
-- don't kill my own connection!
25263 <> pg_backend_pid()
-- don't kill the connections to other databases
AND datname = 'database_name'
;
我使用下面的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:这是Postgresql 9.2+
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
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
从这里和这里的胃肠道谱上提取的。
下面是一个修改后的版本，适用于PostgreSQL 9.1和9.2。
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
