如何获取mysql数据库的大小？

Question

如何获取mysql数据库的大小？
假设目标数据库名为"v3".

Answer 1

运行此查询,您可能会得到您正在寻找的内容:

SELECT table_schema "DB Name",
        ROUND(SUM(data_length + index_length) / 1024 / 1024, 1) "DB Size in MB" 
FROM information_schema.tables 
GROUP BY table_schema; 

此查询来自mysql论坛,其中提供了更全面的说明.

Answer 2

可以使用以下MySQL命令确定

SELECT table_schema AS "Database", SUM(data_length + index_length) / 1024 / 1024 AS "Size (MB)" FROM information_schema.TABLES GROUP BY table_schema

结果

Database    Size (MB)
db1         11.75678253
db2         9.53125000
test        50.78547382

获得GB的结果

SELECT table_schema AS "Database", SUM(data_length + index_length) / 1024 / 1024 / 1024 AS "Size (GB)" FROM information_schema.TABLES GROUP BY table_schema

Answer 3

或者,如果您正在使用phpMyAdmin,则可以查看数据库structure选项卡页脚中表格大小的总和.实际数据库大小可能稍微超过此大小,但它似乎与上述table_schema方法一致.

屏幕截图:

Answer 4

或者,您可以直接跳转到数据目录并检查v3.myd,v3的组合大小.myi和v3.frm文件(用于myisam)或v3.idb&v3.frm(用于innodb).

Answer 5

如果您想要对所有数据库大小的列表进行排序，您可以使用：

SELECT * 
FROM   (SELECT table_schema AS `DB Name`, 
           ROUND(SUM(data_length + index_length) / 1024 / 1024, 1) AS `DB Size in MB`
        FROM   information_schema.tables 
        GROUP  BY `DB Name`) AS tmp_table 
ORDER  BY `DB Size in MB` DESC; 

Answer 6

要获得MB的结果:

SELECT
SUM(ROUND(((DATA_LENGTH + INDEX_LENGTH) / 1024 / 1024), 2)) AS "SIZE IN MB"
FROM INFORMATION_SCHEMA.TABLES
WHERE
TABLE_SCHEMA = "SCHEMA-NAME";

要获得GB的结果:

SELECT
SUM(ROUND(((DATA_LENGTH + INDEX_LENGTH) / 1024 / 1024 / 1024), 2)) AS "SIZE IN GB"
FROM INFORMATION_SCHEMA.TABLES
WHERE
TABLE_SCHEMA = "SCHEMA-NAME";

Answer 7

mysqldiskusage  --server=root:MyPassword@localhost  pics

+----------+----------------+
| db_name  |         total  |
+----------+----------------+
| pics     | 1,179,131,029  |
+----------+----------------+

Answer 8

第一次登录到 MySQL 使用

mysql -u username -p

命令以显示单个数据库的大小及其表（以 MB 为单位）。

SELECT table_name AS "Table",
ROUND(((data_length + index_length) / 1024 / 1024), 2) AS "Size (MB)"
FROM information_schema.TABLES
WHERE table_schema = "database_name"
ORDER BY (data_length + index_length) DESC;

将 database_name 更改为您的数据库

显示所有数据库及其大小（以 MB 为单位）的命令。

SELECT table_schema AS "Database", 
ROUND(SUM(data_length + index_length) / 1024 / 1024, 2) AS "Size (MB)" 
FROM information_schema.TABLES 
GROUP BY table_schema;

Answer 9

进入mysql数据目录并运行du -h --max-depth=1 | grep databasename