I am using only one machine for one at a time & facing below mentioned error multiple times in a single day
original: error: remaining connection slots are reserved for non-replication superuser connections
at Parser.parseErrorMessage (C:\Users\ravi\Hezky_2.0\hezky_uat_node_2.0\node_modules\pg-protocol\dist\parser.js:287:98)
at Parser.handlePacket (C:\Users\ravi\Hezky_2.0\hezky_uat_node_2.0\node_modules\pg-protocol\dist\parser.js:126:29)
at Parser.parse (C:\Users\ravi\Hezky_2.0\hezky_uat_node_2.0\node_modules\pg-protocol\dist\parser.js:39:38)
readable:390:5)
at TLSWrap.onStreamRead (node:internal/stream_base_commons:190:23) {
length: 140,
severity: 'FATAL',
code: '53300',
detail: undefined,
hint: undefined,
position: undefined,
at TLSWrap.onStreamRead (node:internal/stream_base_commons:190:23) {
length: 140,
severity: 'FATAL',
code: '53300',
detail: undefined,
hint: undefined,
position: undefined,
internalPosition: undefined,
internalQuery: undefined,
where: undefined,
schema: undefined,
table: undefined,
column: undefined,
dataType: undefined,
constraint: undefined,
file: 'postinit.c',
line: '813',
routine: 'InitPostgres'
}
}
can someone please help to know what exactly I need to do? my plan: 1 GB RAM / 1vCPU / 10 GB Disk / Primary only / NYC3 - PostgreSQL 16
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Hi there,
As far as I can tell based on the output that you’ve shared, the error suggests that your PostgreSQL database has reached its maximum number of allowed connections.
The message “remaining connection slots are reserved for non-replication superuser connections” indicates that all available connection slots are in use, and the system is reserving the last few for superuser connections.
The potential causes for this could be:
What you could do here in order resolve the error is:
a. Check current connections:
SELECT count(*) FROM pg_stat_activity;
This will show you how many active connections you currently have.
c. Implement connection pooling:
d. Optimize your code:
e. Consider upgrading your plan: Your current plan (1 GB RAM / 1vCPU) might be limiting the number of connections. Upgrading could allow for more simultaneous connections.
On the connection pooling implementation, here is a quick example:
const { Pool } = require('pg');
const pool = new Pool({
user: 'your_username',
host: 'your_host',
database: 'your_database',
password: 'your_password',
port: 5432,
max: 20, // set to a reasonable number based on your needs
idleTimeoutMillis: 30000,
connectionTimeoutMillis: 2000,
});
// Use the pool in your queries
pool.query('SELECT NOW()', (err, res) => {
console.log(err, res);
pool.end();
});
After implementing these changes, monitor your application’s performance and database connection usage.
Let me know how it goes!
- Bobby
Heya,
The error message you are seeing, remaining connection slots are reserved for non-replication superuser connections
, indicates that your PostgreSQL server has reached the maximum number of allowed connections and has reserved the remaining slots for superuser connections. This can prevent regular users from establishing new connections to the database.
The error message you are seeing, remaining connection slots are reserved for non-replication superuser connections
, indicates that your PostgreSQL server has reached the maximum number of allowed connections and has reserved the remaining slots for superuser connections. This can prevent regular users from establishing new connections to the database.
You can increase the max_connections
setting in your PostgreSQL configuration to allow more connections. Here’s how:
Edit the PostgreSQL Configuration File:
Locate and edit the postgresql.conf
file. This file is typically found in the PostgreSQL data directory (e.g., /etc/postgresql/[version]/main/postgresql.conf
on Ubuntu or /var/lib/pgsql/[version]/data/postgresql.conf
on CentOS).
sudo nano /etc/postgresql/[version]/main/postgresql.conf
Increase the max_connections
Parameter:
Find the line that sets max_connections
and increase its value. For example, to increase the maximum connections to 200:
max_connections = 200
Restart PostgreSQL:
After making changes to the configuration file, restart the PostgreSQL service to apply the changes.
sudo systemctl restart postgresql
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