Re: My DataBase can't accept conntecion

At 2011-01-12 23:22:40，"Bill Moran" <wmoran(at)potentialtech(dot)com> wrote:

>In response to zab08 <zab08(at)126(dot)com>:
>
>> we have e test db server, we use jdbc to contect.
>> but after a whie, The test db server can not accept connect.
>>
>>
>> useps aux | grep postgrescommand :
>> postgres 16904 0.0 0.0 46036 3948 ? S 17:03 0:00 /usr/local/pgsql/bin/postgres -D /usr/local/pgsql/data
>> postgres 16906 0.0 0.0 46144 2192 ? Ss 17:03 0:00 postgres: writer process
>> postgres 16907 0.0 0.0 46036 1088 ? Ss 17:03 0:00 postgres: wal writer process
>> postgres 16908 0.0 0.0 46840 2072 ? Ss 17:03 0:00 postgres: autovacuum launcher process
>> postgres 16909 0.0 0.0 14248 1012 ? Ss 17:03 0:00 postgres: stats collector process
>> postgres 16910 0.0 0.0 46972 2992 ? Ss 17:03 0:00 postgres: postgres edu 172.29.0.40(40608) idle
>> postgres 16911 0.0 0.0 46708 2656 ? Ss 17:03 0:00 postgres: postgres edu 172.29.0.40(40609) idle
>> postgres 16912 0.0 0.0 46708 2628 ? Ss 17:03 0:00 postgres: postgres edu 172.29.0.40(40610) idle
>> postgres 16913 0.0 0.0 46708 2628 ? Ss 17:03 0:00 postgres: postgres edu 172.29.0.40(40611) idle
>> postgres 16914 0.0 0.0 46708 2632 ? Ss 17:03 0:00 postgres: postgres edu 172.29.0.40(40612) idle
>> postgres 16915 0.0 0.0 46708 2636 ? Ss 17:03 0:00 postgres: postgres edu 172.29.0.40(40613) idle
>> postgres 16916 0.0 0.0 46708 2632 ? Ss 17:03 0:00 postgres: postgres edu 172.29.0.40(40614) idle
>> postgres 16917 0.0 0.1 47088 4136 ? Ss 17:03 0:00 postgres: postgres edu 172.29.0.40(40615) idle
>> postgres 16918 0.0 0.1 47060 4236 ? Ss 17:03 0:00 postgres: postgres edu 172.29.0.40(40616) idle
>> postgres 16919 0.0 0.1 47052 4136 ? Ss 17:03 0:02 postgres: postgres edu 172.29.0.40(40617) idle
>> postgres 21619 0.0 0.0 46708 2636 ? Ss 19:43 0:00 postgres: postgres edu 172.29.0.40(38803) idle
>> postgres 21620 0.0 0.0 46708 2636 ? Ss 19:43 0:00 postgres: postgres edu 172.29.0.40(38804) idle
>> postgres 21621 0.0 0.0 46708 2640 ? Ss 19:43 0:00 postgres: postgres edu 172.29.0.40(38805) idle
>> postgres 21622 0.0 0.0 46708 2644 ? Ss 19:43 0:00 postgres: postgres edu 172.29.0.40(38806) idle
>> postgres 21623 0.0 0.0 46708 2644 ? Ss 19:43 0:00 postgres: postgres edu 172.29.0.40(38807) idle
>> postgres 21624 0.0 0.0 46708 2636 ? Ss 19:43 0:00 postgres: postgres edu 172.29.0.40(38808) idle
>> postgres 21625 0.0 0.0 46708 2640 ? Ss 19:43 0:00 postgres: postgres edu 172.29.0.40(38809) idle
>> postgres 21626 0.0 0.0 46708 2644 ? Ss 19:43 0:00 postgres: postgres edu 172.29.0.40(38810) idle
>> postgres 21627 0.0 0.0 46708 2640 ? Ss 19:43 0:00 postgres: postgres edu 172.29.0.40(38811) idle
>> postgres 21628 0.0 0.1 47104 4836 ? Ss 19:43 0:00 postgres: postgres edu 172.29.0.40(38812) INSERT
>> ...
>>
>>
>> kill -9 pidcommand to kill all of them in the past? and the test db server is shut down.
>
>Are you insane? If your car doesn't start do you throw hand grenades at
>it? What you're doing is an excellent way to corrupt the data in your
>database.
>
>Use pg_ctl to stop/start/restart the database -- or better, use whatever
>tool is provided by your distribution/operating system.
>
>> how to analyze the reason of these? and how to solve?
>
>Have you ever considered looking in the PostgreSQL log files? If I had
>to make a guess, I would suspect that you've got the connection limit too
>low for the number of connections required by whatever you're doing and
>a simple bump of the config parameter will fix the problem. More serious
>issues are possible, such as client programs going idle and never releasing
>the connection, but I wouldn't assume such problems until you have
>evidence.
>
>--
>Bill Moran
>http://www.potentialtech.com
>http://people.collaborativefusion.com/~wmoran/
>
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client program shut down, but the conetion isnt' close on the test server.
we have 6 clients and , 10 contections each. The test db sever 's max
conections is 100. pg_ctl to stop/start/restart the database can't excute because of the
db the shut down.