purpose of this blog

 The purpose of this blog is to save useful tips about mysql

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dump a specific table

Sometimes you just want a specific mysql table. mysqldump -u [username] -p --no-create-info source_database_name source_table_name > saved_database_content.sql You can then load that content into a new database: mysql -u [username] -p target_database_name < saved_database_content.sql
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Tablespaces error

If you are trying to dump a database in a mysql instance running inside a docker container and you get the following error, despite logging in as a user who has read permission on it, it means that the user you are using does not have the required  PROCESS  privilege to perform certain tasks during the database dump. This is common when attempting to dump information such as  tablespaces , which may require elevated permissions. mysqldump: Error: 'Access denied; you need (at least one of) the PROCESS privilege(s) for this operation' when trying to dump tablespaces fix with: mysqldump -u <username> -p --no-tablespaces <database_name> > dump.sql The --no-tablespaces option in mysqldump prevents the tool from including tablespace information in the dump. Details: Tablespace Information : MySQL uses tablespaces to store table data on disk, especially when dealing with InnoDB tables. When dumping a database, mysqldump by default tries to include metadat...
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Fix: ERROR 1396 (HY000): Operation CREATE USER failed in MySQL?

  Fix: ERROR 1396 (HY000): Operation CREATE USER failed in MySQL? This is a mysql 8 bug. Suppose the user is  myuser . 1. The user already exists. Delete them with DROP. (not DELETE).      DROP USER myuser.     DO NOT use "delete from mysql.user where user=myuser". 2. You already deleted them with DELETE. Try it again with DROP, even if they do not exist.     If you are too late and you already made the mistake in (1) above you can either create a new user with a different name, e.g. myuser2, or, repeat the drop statement above in (1). 3. The password doesn't meet the default MySQL 8 requirements.     Sometimes it is because the password isn't good enough. It must be 8 chars minimum, with at least one caps, one lower, one number, and one punctuation. 4. Check your mysql supports old passwords ( mysql_native_password).    Use  CREATE USER 'myuser'@'localhost' IDENTIFIED WITH  mysql_native_password  BY 's0m3Pa...
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