如何查看 MySQL 数据库容量大小,表容量大小,索引容量大小?找到占用空间最大的表
1. 查看 MySQL「所有库」的容量大小
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)', sum(truncate(DATA_FREE/1024/1024, 2)) as '碎片占用(MB)' from information_schema.tables group by table_schema order by sum(data_length) desc, sum(index_length) desc;
2. 查看 MySQL「指定库」的容量大小
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)', sum(truncate(DATA_FREE/1024/1024, 2)) as '碎片占用(MB)' from information_schema.tables where table_schema='kalacloud_test_data' order by data_length desc, index_length desc;
3. 查看 MySQL「指定库」中「所有表」的容量大小
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)', truncate(DATA_FREE/1024/1024, 2) as '碎片占用(MB)' from information_schema.tables where table_schema='kalacloud_test_data' order by data_length desc, index_length desc;
4. 查看 MySQL「指定库」中「指定表」的容量大小
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)', truncate(DATA_FREE/1024/1024, 2) as '碎片占用(MB)' from information_schema.tables where table_schema='kalacloud_test_data'and table_name='product_demo' order by data_length desc, index_length desc;
5. 查看 MySQL 数据库中,容量排名前 10 的表
USE information_schema; SELECT TABLE_SCHEMA as '数据库', table_name as '表名', table_rows as '记录数', ENGINE as '存储引擎', truncate(data_length/1024/1024, 2) as '数据容量(MB)', truncate(index_length/1024/1024, 2) as '索引容量(MB)', truncate(DATA_FREE/1024/1024, 2) as '碎片占用(MB)' from tables order by table_rows desc limit 10;
6. 查看 MySQL「指定库」中,容量排名前 10 的表
USE information_schema; SELECT TABLE_SCHEMA as '数据库', table_name as '表名', table_rows as '记录数', ENGINE as '存储引擎', truncate(data_length/1024/1024, 2) as '数据容量(MB)', truncate(index_length/1024/1024, 2) as '索引容量(MB)', truncate(DATA_FREE/1024/1024, 2) as '碎片占用(MB)' from tables where table_schema='kalacloud_test_data' order by table_rows desc limit 10;
7. 查看MySQL所有的数据库表
select * from information_schema.tables where table_schema = 'test';
8. 查看MySQL数据库表的所有字段
select * from information_schema.COLUMNS where table_name = 'auth_client_authcode';