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Sometimes PostgreSQL users get errors and warnings and they are unable to understand why. To cater to these situations, this blog volition cover some common errors and warnings in PostgreSQL. In some cases, it is a user setting trouble or query error, but in other cases, information technology can be a PostgreSQL problems. But, it is quite rare to exist a PostgreSQL bug, and therefore it is really important to differentiate betwixt user error and PostgreSQL problems. Here is a list of some common PostgreSQL errors, with symptoms and solutions.

one – Is the PostgreSQL Server Running Locally and Accepting?

$ psql postgres psql : fault : could not connect to server : could non connect to server : No such file or directory Is the server running locally and accepting connections on Unix domain socket "/var/run/postgresql/.due south.PGSQL.5432" ?

This usually occurs when the PostgreSQL server is not running, but in some cases, yous can get a similar error even when the PostgreSQL server is still running. There are multiple means to check whether the server is running or not, depending on the installation and operating system. Here are some steps you lot can perform to bank check:

1 2 iii 4 5 6 7 viii 9 ten eleven 12 13 xiv fifteen sixteen 17

sudo service postgresql-12 condition Redirecting to /bin/systemctl condition postgresql-12.service postgresql-12.service - PostgreSQL 12 database server Loaded : loaded (/usr/lib/systemd/system/postgresql-12.service ; disabled ; vendor preset : disabled ) Agile : active ( running ) since Sunday 2020-05-31 23 : 55 : 39 UTC ; 8s ago Docs : https ://world wide web .postgresql .org/docs/12/static/ Process : 32204 ExecStartPre=/usr/pgsql-12/bin/postgresql-12-bank check-db-dir $ { PGDATA } ( lawmaking=exited , status=0/SUCCESS ) Main PID : 32209 ( postmaster ) CGroup : /system .slice/postgresql-12.service ├─32209 /usr/pgsql-12/bin/postmaster -D /var/lib/pgsql/12/data/ ├─32211 postgres : logger ├─32213 postgres : checkpointer ├─32214 postgres : background writer ├─32215 postgres : walwriter ├─32216 postgres : autovacuum launcher ├─32217 postgres : stats collector └─32218 postgres : logical replication launcher

The status of the PostgreSQL service shows it and all its subprocess processes are running. The 2d reason for the error could be the port number, every bit the default port of PostgreSQL is 5432. If PostgreSQL is configured to run on a different port, then the user needs to specify the port number (with some exceptions). Here is the mode to check the port number:

sudo service postgresql-12 status | grep port Redirecting to /bin/systemctl condition postgresql-12.service LOG : listening on IPv6 accost "::1" , port 5432 listening on IPv4 address "127.0.0.1" , port 5432

2 – Initdb Cannot Exist Run as Root

$ initdb -D information initdb : mistake : cannot be run as root Please log in ( using , e .g . , "su" ) as the ( unprivileged ) user that will own the server process .

The initdb command is used to initialize the PostgreSQL cluster. Sometimes people try to apply that by root, the user which can cause the said error. It'southward very uncomplicated to switch the unprivileged user using us and initdb the cluster. Y'all cannot "initdb" using superuser, so change the user that owns the server process and then do initdb. Or, yous can use postgresql-12-setup to initialize the cluster.

sudo ./postgresql-12-setup initdb

iii – Initdb Failed Due to Directory 'Invalid Permission'

$ initdb -D information running bootstrap script . . . FATAL : information directory "data" has invalid permissions [ 1885 ] Particular : Permissions should be u=rwx ( 0700 ) or u=rwx , yard=rx ( 0750 ) . child process exited with exit code 1 initdb : removing data directory "information"

The directory should accept permission u=rwx (0700) or u=rwx,thou=rx (0750) to perform initdb. Either you tin can initialize the cluster into another directory or change the permission of the directory to u=rwx (0700) or u=rwx,g=rx (0750).

iv – Object Permission

$ SELECT * FROM TEST ; Error : permission denied for table test [ 1788 ] Argument : select * from examination ; Fault : permission denied for table test

This mistake merely happens when you create some object using one user and another user does take access to that object.

5 – Out of Disk Space Mistake

Fault : could not extend file "base/30122/331821" : No space left on device HINT : Check gratuitous deejay space .

PostgreSQL initializes its cluster into $PGDATA. Information technology is very important to keep an center on that directory and free up some infinite before that drive runs out of it. There are some ways to optimize the situation, like:

• Gratis some space on the disk
• Point pg_wal to some other deejay, and in that case, all walls volition generate to another disk, and data is distributed amongst multiple disks.
• Create a tablespace on some other disk and create a table in that tablespace. Yous can divide your information between multiple disks.

6 – Replication Standby Upshot

FATAL : database organization identifier differs between the primary and standby [ 20595 ] DETAIL : The principal 's identifier is 6832398539310516067, the standby' south identifier is 6832397799517112074.

You are replicating a server to another which is not a copy of the original. Y'all need to configure chief replication and tabular array a base backup using pg_basebackup and start the slave.

7 – The Server Terminated

server airtight the connection unexpectedly This probably ways the server terminated abnormally before or while processing the request . The connexion to the server was lost . Attempting reset : Failed

This one is a critical error, and in that instance, y'all need to identify the cause. If possible, generate the stack trace and consult your service provider.

8 – Out of Memory Issue

Error : out of memory 2020-05-08 DETAIL : Failed on request of size 1880.

Every arrangement has a express amount of memory. When in that location is no retentiveness left, PostgreSQL'south memory allocation functions outset failing. Please check your configuration and limitations of your hardware.

ix – OOM Killer

Out of memory : Impale process 1766 ( postmaster ) score 890 or sacrifice kid Killed procedure 1766 , UID 26 , ( postmaster ) full-vm : 24384508 kB , anon-rss : 14376288kB , file-rss : 138616kB

When there is not enough retentiveness left, the OOM killer invokes and kills the PostgreSQL process. Some people disable that process, but information technology is not recommended. You need to check the memory setting according to your hardware.

10 – Replication Archive Command Failure

cp : cannot create regular file '/usr/local/wal/000000010000000000000001' : No such file or directory LOG : archive control failed with exit lawmaking 1 DETAIL : The failed archive command was : cp pg_wal/000000010000000000000001 /usr/local/pgsql-logical/wal/000000010000000000000001

This error appears when you accept specified the destination directory for WAL in archive_command, which does not exist. You need to create /usr/local/wal/ file or specify the directory which does be.

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Source: https://www.percona.com/blog/2020/06/05/10-common-postgresql-errors/

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