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PostgrSQL的连接数过多，修改一下默认的连接数
https://stackoverflow.com/questions/2757549/org-postgresql-util-psqlexception-fatal-sorry-too-many-clients-already
- First find your postgresql.conf file
- If you don’t know where it is, query the database with the sql: SHOW config_file;
- Mine is in: /var/lib/pgsql/data/postgresql.conf
- Login as root and edit that file.
- Search for the string: “max_connections”.
- You’ll see a line that says max_connections=100.
- Set that number bigger, check the limit for your postgresql version.
- Restart the postgresql database for the changes to take effect.
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