【查閱】mysql系統視圖查看

【1】查看表大小

SELECT
    CONCAT(table_schema,'.',table_name) AS 'Table Name',
    table_rows AS 'Number of Rows',
    CONCAT(ROUND(data_length/(1024*1024),3),' MB') AS 'Data Size',
    CONCAT(ROUND(index_length/(1024*1024),3),' MB') AS 'Index Size',
    CONCAT(ROUND((data_length+index_length)/(1024*1024),3),' MB') AS 'Total Size'
FROM
    information_schema.TABLES
WHERE
    table_schema = 'test' AND table_name in ('test101','test102');

 【2】基本命令

【2.1】查看數據庫版本：show variables like 'version';
【2.2】列出所有數據庫：show databases;
【2.3】查看服務器狀態：status；
【2.4】查看數據庫存儲引擎：show engines;
【2.5】查看數據庫存儲引擎插件：show plugins;
【2.6】查看數據庫狀態統計：show status;
【2.7】查看數據庫參數：show variables;
【2.8】查看復制容災：show master status; show slave status;
【2.9】查看單機還是集群：show variables like '%ckuster%';
【2.10】查看觸發器，查看存儲過程: show triggers;     show procedure status;
【2.11】查看當前mysql的線程：show process list;
【2.12】查看用戶授權：show grants for root;
【2.13】更多
show table……
show index……
【2.14】查看當前會話的CRUD等次數：show status like 'com_%';
【2.15】查看字符集：show character set; show variables like 'character%';
【2.16】查看排序規則：show collation;
【2.17】查看數據庫排序規則：show variables like 'collation%';

 【3】系統視圖

【3.1】查看字符集：select * from information_schema.character_sets;
【3.2】查看排序規則：select * from information_schema.collations;