How can I restore the MySQL root user’s full privileges?

本文指导如何解决MySQL中GRANTALL权限未生效的问题,通过停用GRANT TABLES功能,连接数据库并使用特定命令更新权限,最终实现GRANTALL的正常执行。

If the GRANT ALL doesn't work, try:

  1. Stop mysqld and restart it with the --skip-grant-tables option.
  2. Connect to the mysqld server with just: mysql (i.e. no -p option, and username may not be required).
  3. Issue the following commands in the mysql client:

    UPDATE mysql.user SET Grant_priv='Y', Super_priv='Y' WHERE User='root';

    FLUSH PRIVILEGES;

After that, you should be able to run GRANT ALL ON *.* TO 'root'@'localhost'; and have it work.

### Percona XtraBackup MySQL Backup Tool Usage and Download Percona XtraBackup is a powerful tool designed to perform non-blocking backups of MySQL databases, including InnoDB and MyISAM tables. This utility supports incremental backups, compressed backups, partial backups, and more advanced features. #### Installation on RHEL/CentOS Systems For installing Percona XtraBackup on Red Hat Enterprise Linux (RHEL) or CentOS systems, the process involves adding the official repository followed by installation through `yum`. The command sequence ensures that all dependencies are correctly managed: ```bash sudo yum install -y https://repo.percona.com/yum/percona-release-latest.noarch.rpm sudo percona-release setup tools sudo yum install -y percona-xtrabackup-80 ``` Optionally, if compression support during backup operations is desired, QPress can be installed as well[^1]: ```bash sudo yum install -y qpress ``` #### Basic Usage Example To create a full backup using Percona XtraBackup, one would typically use the following commands within an environment where the necessary permissions have been granted for accessing database files directly from disk: ```bash innobackupex --user=root --password=your_password /path/to/backup_directory/ ``` After completing this operation successfully, preparing the backed-up data before restoring it into another instance requires executing prepare phase which applies redo logs onto copied pages ensuring consistency: ```bash innobackupex --apply-log /path/to/backup_directory/ ``` Finally, when ready to restore such prepared snapshot back into production server's datadir location, stopping mysqld service first then copying over contents while preserving ownership & privileges accordingly becomes essential step prior applying changes permanently via restart mechanism[^2]. --related questions-- 1. What additional options does Percona XtraBackup offer beyond standard functionality? 2. How do you configure automated scheduled backups with Percona XtraBackup? 3. Can Percona XtraBackup handle very large datasets efficiently without impacting performance significantly? 4. Are there any specific security considerations when performing remote backups using Percona XtraBackup?
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