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| ---统计各个数据库数据总量
SELECT
table_schema AS "Database",
SUM(data_length + index_length) / 1024 / 1024 AS "Size (MB)"
FROM
information_schema.TABLES
GROUP BY
table_schema;
---查看数据库中各个表大小
SELECT table_schema AS 'Database',
table_name AS 'Table',
round(((data_length + index_length) / 1024 / 1024), 2) AS 'Size_MB'
FROM information_schema.tables
ORDER BY data_length + index_length DESC;
---查询各个数据库中的数据记录数、数据量、索引容量
SELECT
TABLE_SCHEMA AS '数据库',
sum( table_rows ) AS '记录数',
sum(
TRUNCATE ( data_length / 1024 / 1024, 2 )) AS '数据容量(MB)',
sum(
TRUNCATE ( index_length / 1024 / 1024, 2 )) AS '索引容量(MB)'
FROM
information_schema.TABLES
GROUP BY
TABLE_SCHEMA
ORDER BY
sum( data_length ) DESC,
sum( index_length ) DESC;
---查看指定数据库大小
SELECT
table_schema AS '数据库',
sum( table_rows ) AS '记录数',
sum(
TRUNCATE ( data_length / 1024 / 1024, 2 )) AS '数据容量(MB)',
sum(
TRUNCATE ( index_length / 1024 / 1024, 2 )) AS '索引容量(MB)'
FROM
information_schema.TABLES
WHERE
table_schema = 'test';
---查看指定数据库各个表的容量
SELECT
table_schema AS '数据库',
table_name AS '表名',
table_rows AS '记录数',
TRUNCATE ( data_length / 1024 / 1024, 2 ) AS '数据容量(MB)',
TRUNCATE ( index_length / 1024 / 1024, 2 ) AS '索引容量(MB)'
FROM
information_schema.TABLES
WHERE
table_schema = 'test'
ORDER BY
data_length DESC,
index_length DESC;
---查看指定数据库各表中列数量
SELECT TABLE_NAME, COUNT(*) AS COLUMN_COUNT
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_SCHEMA = 'test'
GROUP BY TABLE_NAME;
---查看数据库表空间碎片大小
SELECT
table_schema AS `Database`,
table_name AS `Table`,
round(((data_length + index_length) / 1024 / 1024), 2) AS `Size (MB)`,
round((data_free / 1024 / 1024), 2) AS `Free Space (MB)`
FROM
information_schema.TABLES
WHERE
table_schema='填数据库名';
|
