Hi, I've started migrating my sites to mariadb which is supposed to be a drop-in replacement of mysql. Both run on the same C6 box. DB folders were moved to a new location after both DB servers were stopped and properly upgraded. There were no reboots or power failures. Nevertheless I see these error messages in the logs: # cat /var/opt/rh/rh-mariadb102/log/mariadb/mariadb.log ... 2020-11-29 16:38:23 139882501732320 [Note] /opt/rh/rh-mariadb102/root/usr/libexec/mysqld: ready for connections. Version: '10.2.22-MariaDB' socket: '/var/opt/rh/rh-mariadb102/lib/mysql/mysql.sock' port: 3307 MariaDB Server 2020-11-29 16:38:23 139882394105600 [Warning] Access denied for user 'UNKNOWN_MYSQL_USER'@'localhost' (using password: NO) 2020-11-29 16:39:37 139882394105600 [ERROR] mysqld: Table './wordpress at 002dstorefront/wp_wc_customer_lookup' is marked as crashed and should be repaired 2020-11-29 16:39:37 139882394105600 [ERROR] mysqld: Table 'wp_wc_customer_lookup' is marked as crashed and should be repaired 2020-11-29 16:39:37 139882394105600 [ERROR] mysqld: Table './wordpress at 002dstorefront/wp_wc_customer_lookup' is marked as crashed and should be repaired 2020-11-29 16:39:37 139882394105600 [ERROR] mysqld: Table 'wp_wc_customer_lookup' is marked as crashed and should be repaired 2020-11-29 16:39:37 139882394105600 [Warning] Checking table: './wordpress at 002dstorefront/wp_wc_customer_lookup' ... 2020-11-29 17:16:17 140059421116384 [Note] /opt/rh/rh-mariadb102/root/usr/libexec/mysqld: ready for connections. Version: '10.2.22-MariaDB' socket: '/var/opt/rh/rh-mariadb102/lib/mysql/mysql.sock' port: 3307 MariaDB Server 2020-11-29 17:16:18 140059356550912 [Warning] Access denied for user 'UNKNOWN_MYSQL_USER'@'localhost' (using password: NO) 2020-11-29 17:20:01 140059356550912 [ERROR] mysqld: Table './wordpress at 002dstorefront/wp_options' is marked as crashed and should be repaired 2020-11-29 17:20:01 140059356550912 [ERROR] mysqld: Table 'wp_options' is marked as crashed and should be repaired 2020-11-29 17:20:01 140059356550912 [Warning] Checking table: './wordpress at 002dstorefront/wp_options' 2020-11-29 17:20:02 140059356550912 [ERROR] mysqld: Table './wordpress at 002dstorefront/wp_posts' is marked as crashed and should be repaired 2020-11-29 17:20:02 140059356550912 [ERROR] mysqld: Table 'wp_posts' is marked as crashed and should be repaired 2020-11-29 17:20:02 140059356550912 [Warning] Checking table: './wordpress at 002dstorefront/wp_posts' 2020-11-29 17:20:02 140059356550912 [ERROR] mysqld: Table './wordpress at 002dstorefront/wp_actionscheduler_claims' is marked as crashed and should be repaired 2020-11-29 17:20:02 140059356550912 [ERROR] mysqld: Table 'wp_actionscheduler_claims' is marked as crashed and should be repaired 2020-11-29 17:20:02 140059356550912 [Warning] Checking table: './wordpress at 002dstorefront/wp_actionscheduler_claims' 2020-11-29 17:22:28 140059356550912 [ERROR] mysqld: Table './wordpress at 002dstorefront/wp_usermeta' is marked as crashed and should be repaired 2020-11-29 17:22:28 140059356550912 [ERROR] mysqld: Table 'wp_usermeta' is marked as crashed and should be repaired 2020-11-29 17:22:28 140059356550912 [Warning] Checking table: './wordpress at 002dstorefront/wp_usermeta' 2020-11-29 17:22:31 140059356550912 [ERROR] mysqld: Table './wordpress at 002dstorefront/wp_woocommerce_sessions' is marked as crashed and should be repaired 2020-11-29 17:22:31 140059356550912 [ERROR] mysqld: Table 'wp_woocommerce_sessions' is marked as crashed and should be repaired 2020-11-29 17:22:31 140059356247808 [ERROR] mysqld: Table './wordpress at 002dstorefront/wp_woocommerce_sessions' is marked as crashed and should be repaired 2020-11-29 17:22:31 140059356247808 [ERROR] mysqld: Table 'wp_woocommerce_sessions' is marked as crashed and should be repaired 2020-11-29 17:22:31 140059356550912 [Warning] Checking table: './wordpress at 002dstorefront/wp_woocommerce_sessions' ... Note that after the crashed table was repaired mariadb reported multiple crashed tables in the same DB after restart. Any pointers? Never had such problems with mysqld. Is mariadb reliable and stable at all? # cat /etc/centos-release CentOS release 6.10 (Final) # rpm -qa '*maria*' rh-mariadb102-mariadb-server-utils-10.2.22-1.el6.x86_64 rh-mariadb102-mariadb-common-10.2.22-1.el6.x86_64 rh-mariadb102-mariadb-10.2.22-1.el6.x86_64 rh-mariadb102-mariadb-server-10.2.22-1.el6.x86_64 rh-mariadb102-mariadb-config-10.2.22-1.el6.x86_64 rh-mariadb102-mariadb-errmsg-10.2.22-1.el6.x86_64 rh-mariadb102-runtime-3.0-5.el6.x86_64 TIA, AK