Question

我的实例的最大连接数为16.一旦我意识到我有 19 连接，我就匆匆杀了一个，结果打开了一个具有相同优先级的标准连接和限制。

我现在已达到绝对最大连接数， 20 ，甚至无法执行pg:ps或pg:killall。

如何终止所有连接，或者现在做什么来降低连接数？似乎是阻塞的查询非常长（看起来像一个有{410}条目的表的select *。

$ heroku pg:info -a XYZ
=== HEROKU_POSTGRESQL_COBALT_URL (DATABASE_URL)
Plan:        Basic
Status:      Available
Connections: 19
PG Version:  9.1.11
Created:     2013-03-12 15:11 UTC
Data Size:   7.16 GB
Tables:      103
Fork/Follow: Unsupported
Rollback:    Unsupported
$ heroku pg:ps -a XYZ
 procpid | source |   running_for   | waiting | (...)
$ heroku pg:kill 12593 -a XYZ
 pg_cancel_backend 
-------------------
 t
(1 row)

$ heroku pg:ps -a XYZ
psql: FATAL:  too many connections for role "abc"
 !    Heroku client internal error.
 !    Search for help at: https://help.heroku.com
 !    Or report a bug at: https://github.com/heroku/heroku/issues/new

    Error:       undefined method `[]' for nil:NilClass (NoMethodError)
    Backtrace:   /home/chris/.heroku/client/lib/heroku/command/pg.rb:442:in `version'
                 /home/chris/.heroku/client/lib/heroku/command/pg.rb:447:in `nine_two?'
                 /home/chris/.heroku/client/lib/heroku/command/pg.rb:451:in `pid_column'
                 /home/chris/.heroku/client/lib/heroku/command/pg.rb:226:in `ps'
                 /home/chris/.heroku/client/lib/heroku/command.rb:218:in `run'
                 /home/chris/.heroku/client/lib/heroku/cli.rb:37:in `start'
                 /usr/local/heroku/bin/heroku:24:in `<main>'

    Command:     heroku pg:ps -a XYZ
    Version:     heroku-toolbelt/3.9.6 (x86_64-linux) ruby/2.0.0
$ heroku pg:killall -a XYZ
psql: FATAL:  too many connections for role "abc"
 !    Heroku client internal error.
 !    Search for help at: https://help.heroku.com
 !    Or report a bug at: https://github.com/heroku/heroku/issues/new

    Error:       undefined method `[]' for nil:NilClass (NoMethodError)
    Backtrace:   /home/chris/.heroku/client/lib/heroku/command/pg.rb:442:in `version'
                 /home/chris/.heroku/client/lib/heroku/command/pg.rb:447:in `nine_two?'
                 /home/chris/.heroku/client/lib/heroku/command/pg.rb:451:in `pid_column'
                 /home/chris/.heroku/client/lib/heroku/command/pg.rb:272:in `killall'
                 /home/chris/.heroku/client/lib/heroku/command.rb:218:in `run'
                 /home/chris/.heroku/client/lib/heroku/cli.rb:37:in `start'
                 /usr/local/heroku/bin/heroku:24:in `<main>'

    Command:     heroku pg:killall -a XYZ
    Version:     heroku-toolbelt/3.9.6 (x86_64-linux) ruby/2.0.0
$ heroku pg:info -a XYZ
=== HEROKU_POSTGRESQL_COBALT_URL (DATABASE_URL)
Plan:        Basic
Status:      Available
Connections: 20
PG Version:  9.1.11
Created:     2013-03-12 15:11 UTC
Data Size:   8.24 GB
Tables:      103
Fork/Follow: Unsupported
Rollback:    Unsupported

Answer 1

我抓住了以下工具带附加组件，它完美无缺。

https://github.com/heroku/heroku-pg-extras#usage

Answer 2

我的解决方案是推广另一个数据库并再次分配原文

heroku addons:add heroku-postgresql:hobby-basic 
#Attached as NEW_DATABASE_URL

heroku pg:promote NEW_DATABASE_URL

heroku pg:promote ORIGINAL_DATABASE_URL

然后验证您的数据库连接

达到最大连接时，杀死heroku上的所有数据库连接

2 个答案: