Error 42501 permission denied to create database - Исправление ошибок и поиск оптимальных решений проблем

A last-minute website error is always frustrating.

PostgreSQL database queries often end up in errors with code 42501.

This PostgreSQL error 42501 usually occurs when an underprivileged user queries a database. This can be tricky to troubleshoot.

That’s why we often get requests to fix PostgreSQL errors as a part of our Server Management Services.

Today, let’s have a look into the error 42501 and see how our Support Engineers fix it for our customers.

When does PostgreSQL error 42501 occur?

Before moving on to the error 42501, let’s first see more about PostgreSQL.

PostgreSQL is one of the versatile database management systems. It comes handy for developers to build applications, server administrators to protect data and so on. In other words, PostgreSQL is a highly extensible database system.

The error code 42501 denotes insufficient privilege for the database user. But, there can be many reasons that lead to this error.

1. Insufficient privilege for the user

Usually, the 42501 error occurs when a PostgreSQL user with insufficient privileges makes a query on a database.

This indicates that the database user executed an operation, for which the user has no rights.

For database management, the user needs enough rights over the database.

When one of our customers was trying to query a database table in a PostgreSQL tool like pgAdmin, it ended up in error 42501.

The error message was

By default, in the PostgreSQL database, the user restoring the database will have the database ownership. For instance, when restoring a database as the root user, all objects will be under root ownership. And if another user is running any query on this database, it shows the 42501 error.

2. SELinux setting

Sometimes, the SELinux setting in the server can also cause an insufficient privilege error.

SELinux is a security architecture that is a part of Linux kernel. In SELinux, access and transition rights of a user, application, process, and file are all defined. Thus, if SELinux is enabled it affects the user privileges then the database query can end up in a 42501 error.

Fix for 42501 permission denied error

When our customers approach us with this error, our Support Team first checks the reasons that cause this error. The major reasons are insufficient user privilege and SELinux settings.

Now, let’s see how our Support Team fixes this error.

1.Granting Privilege to a user

First and foremost, when a customer approaches us with a 42501 error, we check the database user privileges already given.

If the user lacks enough permission, then we change it accordingly.

Mostly, the user does not have privileges over the requested tables.

In this case, we give privileges to the user over the requested tables using the command.

GRANT SELECT ON table_name TO PUBLIC;

This command gives all privileges over the table to the public, hence anyone can use it.

But, some customers prefer giving privileges only to a few users.

In this case, to give table access only to certain users, we use the command.

GRANT SELECT ON table_name TO user_name;

After giving privileges to the user, our Support Team executes the query once again. This ensures that the error is fixed.

Similarly, if the root user restored the dump file, this can cause insufficient privilege for the database user.

That is, if the root user restores the database using pg_dump --no-owner then the root user who restored the database will have all privileges.

So, we always restore the database using the login of the desired user. Then, this user will have all privileges over the database.

2. Disabling SELinux

In some cases, the user has enough privilege over the database and still the database query show 42501 error. Here, the SELinux can be the reason causing the error.

After considering other security settings, our Support Team disables this feature using the command.

selinuxenabled && echo enabled || echo disabled

[Still having trouble in fixing PostgreSQL errors? – We will fix it for you.]

Conclusion

In short, the PostgreSQL error 42501 occurs mainly due to insufficient privileges for database user for running query. We saw how our Support Engineers fixed this error for our customers.

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Источник

I am trying to query a database table in postgresql, but every time I run the below query it gives me the INSUFFICIENT PRIVILEGE error. What possibly could be the reason for such permission denied error. Also, I am using pgadmin tool in windows to connect the database which is in Linux environment. Below is the query I am running

> > SELECT appid,hash 
>       FROM app
>       WHERE appid=1;

While running the same query I am getting the below Error

ERROR:  permission denied for relation app

********** Error **********

ERROR: permission denied for relation app
SQL state: 42501

asked Aug 12, 2013 at 17:53

AKIWEBAKIWEB

18.6k66 gold badges177 silver badges287 bronze badges

The user running the query will need permissions to that table. You can grant them to that user with the GRANT statement. The below is an example that grants to PUBLIC

GRANT SELECT ON tablename TO PUBLIC;

Also I have seen SELinux cause isses and places such as here mention it. I am not exactly sure of the command to turn SELinux off but you can see if it is running by using

selinuxenabled && echo enabled || echo disabled

answered Aug 12, 2013 at 17:58

sealzsealz

5,3385 gold badges38 silver badges70 bronze badges

It simply means that you have no permission to access app table. Request your root or database administrator to grant you the permission to access app table. if your are the root or have granting privilege you can use grant command to grant your self permission to use all sql statements on table or database
For Example:

               grant all privileges on database money to cashier;

before that you have to login as root or user that have granting privileges

for more details on this command refer to
http://www.postgresql.org/docs/8.1/static/sql-grant.html

answered Aug 12, 2013 at 18:12

If it’s DB2 then go to command console of DB2, select your respective Database and select Authorities option by right click on the Database then add your respective DB2 user and grant required access.

answered Aug 1, 2016 at 12:20

You need to make sure that the user with which you are connecting with also has the «USAGE» access on the schema you are trying to access with the user. I have recently faced an error where I got the dump restored into a database and then had some users to whom I was only supposed to provide the read-only access. I have followed the following steps —

CREATE ROLE myapp_readonly;
GRANT CONNECT ON DATABASE {database} TO myapp_readonly;
GRANT USAGE ON SCHEMA {schema} TO myapp_readonly;
GRANT SELECT ON TABLE {schema}.{table_name} TO myapp_readonly;
GRANT myapp_readonly TO {usre};

After performing these steps when I tried to access the table, had received the following error —

SQL Error [42501]: ERROR: permission denied for schema {schema}

In my case, my users were available already and the schemas and the database were restored recently. After I have provided the «USAGE» access to the schema to the user the error was resolved.

answered Jul 7, 2020 at 23:38