You may notice from my last question that a problem caused some more problems, Reading MySQL manuals in MySQL monitor?
My database is now unusable partly due to my interest to break things and my inability to look at error messages. I know that I should not reuse primary keys, but I would like to use them again after the removal of the database that I deteriorated. So
How can I correctly remove a MySQL database?
From the MySQL prompt:
mysql> drop database <db_name>;
If your database cannot be dropped, even though you have no typos in the statement and do not miss the ; at the end, enclose the database name in between backticks:
mysql> drop database `my-database`;
Backticks are for databases or columns, apostrophes are for data within these.
For more information, see this answer to Stack Overflow question When to use single quotes, double quotes, and backticks?.
If you are using an SQL script when you are creating your database and have any users created by your script, you need to drop them too. Lastly you need to flush the users; i.e., force MySQL to read the user's privileges again.
-- DELETE ALL RECIPE
drop schema <database_name>;
-- Same as `drop database <database_name>`
drop user <a_user_name>;
-- You may need to add a hostname e.g `drop user bob#localhost`
FLUSH PRIVILEGES;
Good luck!
drop database <db_name>;
FLUSH PRIVILEGES;
I needed to correct the privileges.REVOKE ALL PRIVILEGES ONlogs.* FROM 'root'#'root'; GRANT ALL PRIVILEGES ONlogs.* TO 'root'#'root'WITH GRANT OPTION;
For Visual Studio, in the package manager console:
drop-database
If you are working in XAMPP and your query of drop database doesn't work then you can go to the operations tag where you find the column (drop the database(drop)), click that button and your database will be deleted.
Related
I need a drop a user from my mysql server and the former admin created a very strange entry, user XXX # €€s#€%.
So, the normal syntax:
drop user 'nick'#"€€s#€%";
does not work, and it complains about:
Malformed hostname (illegal symbol: '#')
Is there a way around it without the risk of messing up with existing users? This is my work's mysql server and I don't really want to experiment/change much, if possible.
Thank you!
Added solution based on comments
UPDATE mysql.user SET host='test' WHERE user='nick'
DROP USER 'nick'#'test'
I recently tried this in MySQL 5.5.x:
GRANT
SELECT, INSERT, UPDATE, DELETE, TRUNCATE ON crawler.*
TO 'my_user'#'localhost' WITH GRANT OPTION;
This results in an error:
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'TRUNCATE ON crawler.*
TO 'my_user'#'localhost' WITH GRANT OPTION' at line 2
This used to work before I added TRUNCATE, so after a bit of research I find that this is not supported in MySQL.
The reason for this is that TRUNCATE is classified as a DDL operation, and so it doesn't use DELETE internally, it uses DROP. Alright, so I'd like to restrict this user to dropping tables (in the event of a security breach, at least a malicious user would have to determine the names of tables and drop them individually).
However, it turns out I would need to grant this user the DROP privilege, which allows the user to drop whole databases too. Given that there is not a grant for individual tables, is there another way to do this? I suppose I could hand this off to another process with a different user, but it feels a bit cumbersome for such a small issue.
For the time being, I'll stick with DELETE, even though it is rather slow! (On my laptop it takes ~55 sec to delete 1.6M small rows, and a fraction of a second to truncate the same). However, I am all ears if there is a faster and secure alternative.
To grant DROP privilege on a specific table in a specific database to a specific user in MySQL, you can use a GRANT statement like this. (This assumes that table fi exists in database fee, and this is the table you want to allow the user 'fo'#'%' to be able to TRUNCATE):
GRANT DROP ON TABLE fee.fi TO 'fo'#'%'
To see that the user has privilege to truncate that specific table:
SHOW GRANTS FOR 'fo'#'%' ;
And connect as user 'fo'#'%' to test:
TRUNCATE TABLE fee.fi ;
(Obviously, the user also has the privilege to DROP that same table. But that's just the way it is in MySQL.)
As an alternative, to allow the user to perform only the TRUNCATE operation on that specific table, without granting the user DROP privilege on the table...
create a stored procedure that performs a TRUNCATE fee.fi; (That will probably need to be executed dynamically since it's DDL.) The procedure will need to be created with DEFINER privileges, and created by a user that has the required privileges.
Then you can grant execute on the procedure to the user:
GRANT EXECUTE ON fee.truncate_table_fee_fi TO 'fo'#'%';
Then user 'fo'#'%' can
CALL fee.truncate_table_fee_fi
In phpmyadmin I want to grant users to create and delete databases but this access should be limited to a specific prefix.
My users have 3 different accounts on PhpMyAdmin: username_ro (for only reading), username_rw (for reading and writing) and username_admin (for creating other databases and tables into their account)
I want them to be able to create a database username_website but I don't want them to be able to create database theother_website. They should also be able to drop username_website but unable to drop theother_website
How can I do this with sql or PhpMyAdmin.
Thanks in advance.
With some trial and error I have found a solution. By doing this query I was able to create and drop database username_website but I wasn't able to create or drop database theother_clients
GRANT ALL PRIVILIGES
ON `username\_%`.*
TO 'username_admin'#'localhost';
PS. the query is a little edited. I changed the rights I actually gave with ALL PRIVILIGESand I changed the actual username with username.
I want to create a user and only allow them to use select statements on the cameracircle database. So I have the following code:
CREATE USER 'hoeym'#'localhost' IDENTIFIED BY 'password';
CREATE DATABASE cameracircle;
GRANT SELECT ON cameracircle TO 'hoeym'#'localhost';
But the phpmyadmin doesn't like that. If I run this it says there is an error cause I don't have a databases selected, and if I add in USE cameracircle; before the GRANT statement it says that there is no table inside the database with the same name as the database. What have I done wrong?
Before you issue a GRANT statement, check that the
derby.database.sqlAuthorization
property is set to true. The derby.database.sqlAuthorization property enables the SQL Authorization mode.
Solved it with
GRANT SELECT ON cameracircle.* TO 'hoeym'#'localhost';
phpMyAdmin lets you do this graphically. From the Users tab, look for Add User then don't select anything for the Global Privileges area. Go ahead and create the user, then edit the privileges. Halfway down the page there's a area for "Database-specific privileges" where you can specify the permissions on a database (or even table-) level.
I'm having a problem dropping a temporary table. The user account does not have the 'drop' privilege. I don't want to grant that privilege due to security reasons.
I tried to find a privilege like 'drop temporary' but there isn't. It seems the only option is to remove all the 'drop table' statements. I know that the temporary tables will be automatically dropped after the DB sessions end.
However, I'm not sure if there are any side effects leaving this job to MySQL. Please, advice.
Temporary tables are dropped automatically as soon as you disconnect from database
A TEMPORARY table is visible only to the current connection, and is dropped automatically when the connection is closed
http://dev.mysql.com/doc/refman/5.1/en/create-table.html
So - create them, use and don't bother of theirs deletion
It will use current machine's Ram space.
So better idea is drop the temporary table on the next step ,once its use is over
If the user has CREATE TEMPORARY TABLES privilege, he can perform DROP TABLE, INSERT, UPDATE and SELECT.
Please see: https://dev.mysql.com/doc/refman/5.7/en/privileges-provided.html#priv_create-temporary-tables