mysql 被入侵，执行了下列操作，都是什么意思，以及有可能是从哪里入侵的？

select @@datadir;

SELECT DISTINCT TABLE_NAME, SPACE FROM INFORMATION_SCHEMA.INNODB_BUFFER_PAGE_LRU

WHERE TABLE_NAME IS NOT NULL AND TABLE_NAME NOT LIKE 'SYS%';

SELECT DISTINCT TABLE_NAME, SPACE FROM INFORMATION_SCHEMA.INNODB_BUFFER_PAGE_LRU WHERE TABLE_NAME IS NOT NULL AND TABLE_NAME NOT LIKE 'SYS%';