How to Drop a Table in Redshift
Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community. It only takes a minute to sign up. I have a pretty standard problem that I can't resolve. The amount of tables and schemas I have is too big so I can't randomly try everything hoping that at some point I will remove the needed privilege.
After trying suggestions from countless posts and threads, awslabs' aws-redshift-utils provided relief in the form of admin. It instantly identified the remaining dependencies making it possible to drop the user in question. Before you drop a user, you must revoke any privileges that the user has and then transfer ownership of any database objects that the user owns. This script creates a view in Amazon Redshift that is useful for the next two steps. Find all privileges granted to the user and then grant those privileges to the user again, as a superuser or another user, as shown in the following example.
Find all privileges granted to the user and then revoke those privileges, as shown in the following example.
How to View Permissions in Amazon Redshift
This script creates a view in Amazon Redshift that is useful for the next step. Find all objects owned by the user and then transfer ownership to a different user. In the example below, is the current owner and is the new owner.
If you drop a user that owns objects in another database, the owner for those objects is changed to 'unknown'. You can follow below steps to to revoke all the privileges assigned to that user and later drop user from the database.
NOTE - admin. You can see the view definition here and create it in your database. Kamlesh Gallani's response works great. I created a Python script for it:. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Drop user in redshift which has privilege on some object Ask Question. Asked 3 years, 9 months ago. Active 8 months ago. Viewed 11k times.
The problem is that I have no idea what kind of privilege is this and on what object. So how can I remove that user?
Hands on with AWS Redshift: Table Design
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Following a google search on it I found out that I need to revoke the user's permissions so I run several revoke queries but I still fail with the same message:. After trying suggestions from countless posts and threads, awslabs' aws-redshift-utils provided relief in the form of admin. It instantly identified the remaining dependencies making it possible to drop the user in question. Learn more. Can't drop user from Redshift Ask Question.
Asked 3 years, 5 months ago. Active 1 year, 1 month ago. Viewed 3k times. Answered in dba. Active Oldest Votes. MatthewMartin Roshan Nagpure Roshan Nagpure 66 6 6 bronze badges. Ville Ville 3, 1 1 gold badge 28 28 silver badges 35 35 bronze badges. Vinayak Thatte Vinayak Thatte 2 2 silver badges 4 4 bronze badges.
This worked for me, but only after I realised I had to revoke the default privileges on the schema before I revoked privileges on the schema itself.
Only then was I finally able to drop my user. Works well, you might have to create the admin schema first with create schema admin. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Featured on Meta.If the user owns an object in another database, then no errors are thrown.
Run the following command on each database in your cluster. This command checks for objects that are owned by deleted users. If a deleted user still owns objects in a database, you get an output similar to the following. In the following example, the new owner is userc. Before dropping a user, run the following query to find objects that they own. In the following example, the user is labuser. This query might not find users who own schemas that were created with a command similar to the following.
In this example, labuser is the schema owner. Users with schema-level authorizations can't be dropped unless the schema is transferred to a new owner. Here's an example of how to transfer ownership to userc :.
How do I resolve the "user cannot be dropped" error in Amazon Redshift? Querying the Catalog Tables. View Database Users. Prevention Before dropping a user, run the following query to find objects that they own. Did this article help you? Anything we could improve? Let us know. Need more help? Contact AWS Support.Knowing who has access to what tables in Amazon Redshift is very important.
You want to make sure users have the data they need to do their jobs, but also want to keep your data secure. This tutorial will show you an easy way to see what permissions have been granted to users in your database.
Amazon Redshift allows many types of permissions. More details on the access types and how to grant them in this AWS documentation.
Usage: Allows users to access objects in the schema. User still needs specific table-level permissions for each table within the schema. To view the permissions of a specific user on a specific schema, simply change the bold user name and schema name to the user and schema of interest on the following code.
Similarly, to view the permissions of a specific user on a specific table, simply change the bold user name and table name to the user and table of interest on the following code. In this tutorial we will show you a fairly simple query that can be run against your cluster's STL table revealing queries that were alerted for having nested loops. This tutorial will explain how to select the best compression or encoding in Amazon Redshift. One key step towards tuning your Amazon Redshift database is carefully selecting sort keys to optimize your queries.
This tutorial will explain how to select appropriate sort keys. SQL may be the language of data, but not everyone can understand it. With our visual version of SQL, now anyone at your company can query data from almost any source—no coding required. Data Tutorials. Access Types Amazon Redshift allows many types of permissions. Schema level permissions Usage: Allows users to access objects in the schema.
Learn about Visual SQL.Amazon Redshift works really great for big data. You can run complex analytical queries on petabyte-scale data. If you are beginner with Amazon Web Service you can get started with below articles.
Amazon Redshift documentation is quite good. Having said that I find lack of Redshift query examples for handling user access control. Below I am going to explain list of Amazon Redshift queries which will be very helpful in your day to day work. You need to revoke user access from table before dropping user.
Without revoking you will not be able to drop the user. Creating read only users can be very tricky in Amazon Redshift. After reading Amazon Redshift documentation I ran below query:. I tried accessing [schema-name].
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Sign up. Branch: master. Find file Copy path. Raw Blame History. This is useful for recreating users or group privileges or for revoking privileges before dropping a user or group.
Current Version: 1. Cluster must be on patch 1. History: Version 1. View is now significantly faster on clusters with a large number of users and privileges adedotua added column grantseq to help return the DDLs in the order they need to be granted or revoked adedotua renamed column sequence to objseq and username to grantee Version 1. Version 1. Increased ddl column to varchar to incorporate CrisFavero pull request. Fixed handling for empty default aclitem Version 1.
Find all grants by granted by user to drop and regrant them as another user superuser preferably. Find all grants granted to user to drop and revoke them. You signed in with another tab or window. Reload to refresh your session.
You signed out in another tab or window. Purpose: View to generate grant or revoke ddl for users and groups.In the prior sections, we covered how to setup an Amazon Redshift cluster and how to configure networking and security groups. In this section, we go over some matters about User Management. We mentioned earlier, when you create an instance you create the Master User and its login credentials. However, Redshift allows you to control further and configure your permission settings or add new users.
In the previous section, we discussed the cluster connectivity permissions which are actually over networking access and security groups. So you are welcome to refer to Configure Networking and Security Groups. Amazon separates such access to Authentication and Access Control.
It provides complete access to all of your AWS resources. Then, use this administrator user to create other IAM users and roles with limited permissions. It has no username, password or keys associated with it but instead, if a user is assigned to an IAM Role, access keys are created dynamically and provided to that user.
Everything you need to know about IAM Roles is here.
Access control is the permission you have to perform operations like creating an Amazon Redshift cluster, IP addresses, Security Groups, Snapshots and more. For example, you may attach permissions policy to a user to allow him to create an Amazon Cluster. You may also find a list with example policies for administering AWS resources in here.
You must be a superuser to create an Amazon Redshift user. The Master User is a superuser. A database superuser bypasses all permission checks. Be very careful when using a superuser role. AWS recommends that you do most of your work as a role that is not a superuser.
A superuser can create other superusers and users. These users can be owners of databases, tables, views, grant privileges for specific objects and resources.
Superusers have database ownership privileges to all databases. Below we are going to see some Amazon Redshift queries which can be helpful in your user management along with links with more details on each command.
Note: You cannot drop a user if the user owns any database object, such as a schema, database, table, or view, or if the user has any privileges on a table, database, or group. Cluster Connectivity Permissions In the previous section, we discussed the cluster connectivity permissions which are actually over networking access and security groups.
Access Control Access control is the permission you have to perform operations like creating an Amazon Redshift cluster, IP addresses, Security Groups, Snapshots and more. Overview of IAM Policies here.