YIDAY的专栏

1.启动mysql时,一直不成功,查看错误日志 /var/log/mysql/error.log 2.主要的错误信息有如下几条: [ERROR] InnoDB: mmap(136151040 bytes) failed; errno 12 [ERROR] InnoDB: Cannot allocate memory for the buffer pool [ERROR] InnoDB: Plugin initialization aborted with error Generic error .

${database} 为数据库的名称/*1.查看索引 （1）单位是GB*/ SELECT CONCAT(ROUND(SUM(index_length)/(1024*1024*1024), 6), ' GB') AS 'Total Index Size' FROM information_schema.TABLES WHERE table_schema LIKE '${database}'; /* +------------------+ | Total Index Size | +...