问题
I logged in to source database template1 and now I can't create database. When I try to create database, I get this error:
OperationalError: source database "template1" is being accessed by other users
DETAIL: There are 5 other session(s) using the database.
Every time I login to template1, I use 'exit' command to logout, but as you can see it does not logout and number of sessions increases everytime I login. Is there a way to force disconnect every connection to template1 that logged in now?
回答1:
Database template1 exists only to provide barebone structure to create another empty database. You should never logon to template1, otherwise you will have problems.
Probably easiest solution for you is to restart PostgreSQL server process, and logon again. Database that should always exist and is safe to logon is postgres.
If restarting is not an option, you can use another emergency template database: template0.
By default, this statement:
CREATE DATABASE dbname;
is equivalent to:
CREATE DATABASE dbname TEMPLATE template1;
If template1 is not available or corrupted, you can use template0 as last resort:
CREATE DATABASE dbname TEMPLATE template0;
You can read more about template databases here.
回答2:
This helped me solve my problem:
SELECT *, pg_terminate_backend(procpid)
FROM pg_stat_activity
WHERE usename='username';
--Use pid if PostgreSQL version 9.2 or above.
I terminated all active connections to template1 and could create database normally
回答3:
You can also try to terminate the current process thread by the Terminal
Search the Process :
sudo ps aux | grep template1
Kill the Process :
sudo kill -9 < your process id >
回答4:
To solve this, I have to disconnect the database connection from the pgAdmin III.
回答5:
I have a script that connects to a database and performs various operations on it, some requiring that no one else is logged in. I modified @Andrius's answer not to terminate my script's connection, but rather terminate everyone else's:
SELECT pg_terminate_backend(pid) FROM pg_stat_activity WHERE pid <> pg_backend_pid();
From the docs: pg_backend_pid() is the Process ID of the server process attached to the current session.
回答6:
This problem occur when you had logged(psql template1 or psql template0) in template1 and template0 database and exit using below command.
Ctrl + z
Better way exist from db use below postgres command then problem will not create:
\q + enter
There are 2 solutions, If have problem.
Solution - 1
Restart posgres service like.
sudo service postgresql restart
Solution - 2
sudo ps aux | grep template1
Make sure don't delete this processes
postgres 8363 0.0 0.0 111760 7832 pts/11 T 09:49 0:00 /usr/lib/postgresql/9.5/bin/psql template1 ankit 18119 0.0 0.0 14224 976 pts/14 S+ 12:33 0:00 grep --color=auto template1
rest of process should be kill using below command.
sudo kill -9
Now try to create db again.
Hope this help you.
Ankit H Gandhi.
回答7:
On Windows I had to reinstall PostgreSQL, restart did not help.
回答8:
You can try to restart the postgresql service that is running in the background.
来源：https://stackoverflow.com/questions/14374726/postgresql-cant-create-database-operationalerror-source-database-template