1.?报错环境描述：RHEL7下，在删除了以MariaDB-compat方式安装的mariadb后，再新装数据库无法启动，相关报错与问题信息如下：
210109?14:39:15?mysqld_safe?mysqld?from?pid?file?/var/run/mariadb/mariadb.pid?ended 210109?14:40:37?mysqld_safe?Starting?mysqld?daemon?with?databases?from?/var/lib/mysql 210109?14:40:37?[Note]?/usr/libexec/mysqld?(mysqld?5.5.68-MariaDB)?starting?as?process?3044?... 210109?14:40:37?InnoDB:?The?InnoDB?memory?heap?is?disabled 210109?14:40:37?InnoDB:?Mutexes?and?rw_locks?use?GCC?atomic?builtins 210109?14:40:37?InnoDB:?Compressed?tables?use?zlib?1.2.7 210109?14:40:37?InnoDB:?Using?Linux?native?AIO 210109?14:40:37?InnoDB:?Initializing?buffer?pool,?size?=?128.0M 210109?14:40:37?InnoDB:?Completed?initialization?of?buffer?pool InnoDB:?Error:?checksum?mismatch?in?data?file?./ibdata1 210109?14:40:37?InnoDB:?Could?not?open?or?create?data?files. 210109?14:40:37?InnoDB:?If?you?tried?to?add?new?data?files,?and?it?failed?here, 210109?14:40:37?InnoDB:?you?should?now?edit?innodb_data_file_path?in?my.cnf?back 210109?14:40:37?InnoDB:?to?what?it?was,?and?remove?the?new?ibdata?files?InnoDB?created 210109?14:40:37?InnoDB:?in?this?failed?attempt.?InnoDB?only?wrote?those?files?full?of 210109?14:40:37?InnoDB:?zeros,?but?did?not?yet?use?them?in?any?way.?But?be?careful:?do?not 210109?14:40:37?InnoDB:?remove?old?data?files?which?contain?your?precious?data! 210109?14:40:37?[ERROR]?Plugin?‘InnoDB‘?init?function?returned?error. 210109?14:40:37?[ERROR]?Plugin?‘InnoDB‘?registration?as?a?STORAGE?ENGINE?failed. 210109?14:40:37?[Note]?Plugin?‘FEEDBACK‘?is?disabled. 210109?14:40:37?[ERROR]?Unknown/unsupported?storage?engine:?InnoDB 210109?14:40:37?[ERROR]?Aborting
可以在报错信息中看到InnoDB相关的错误：checksum mismatch in data file ./ibdata1
原因即为 ibdata1 文件的校验和不匹配
2. 查找以上报错信息相关资料，需要删除此前产生的日志文件
将 /var/lib/mysql/ 目录下的 ibdata1，ib_logfile0，ib_logfile1 几个文件修改文件名后再次尝试启动mariadb成功，服务正常启动后，自动产生了新的文件。