我可以运行这个查询来获得MySQL数据库中所有表的大小:
show table status from myDatabaseName;
我希望有人能帮助我理解结果。我在找尺寸最大的桌子。
我应该看哪一列?
当前回答
SELECT TABLE_NAME AS "Table Name",
table_rows AS "Quant of Rows", ROUND( (
data_length + index_length
) /1024, 2 ) AS "Total Size Kb"
FROM information_schema.TABLES
WHERE information_schema.TABLES.table_schema = 'YOUR SCHEMA NAME/DATABASE NAME HERE'
LIMIT 0 , 30
您可以从“information_schema”-> SCHEMATA表->“SCHEMA_NAME”列中获取模式名称
额外的 你可以得到mysql数据库的大小如下。
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
ORDER BY `DB Size in MB` DESC;
结果
DB Name | DB Size in MB
mydatabase_wrdp 39.1
information_schema 0.0
你可以在这里得到更多的细节。
其他回答
下面是另一种使用bash命令行的方法。
for i in `mysql -NB -e 'show databases'`; do echo $i; mysql -e "SELECT table_name AS 'Tables', round(((data_length+index_length)/1024/1024),2) 'Size in MB' FROM information_schema.TABLES WHERE table_schema =\"$i\" ORDER BY (data_length + index_length) DESC" ; done
这应该在mysql中测试，而不是postgresql:
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;
我发现现有的答案实际上并没有给出磁盘上表的大小，这更有帮助。 与基于data_length的表大小相比，此查询提供了更准确的磁盘估计 和索引。我不得不在AWS RDS实例中使用这种方法，因为您无法物理地检查磁盘和检查文件大小。
select NAME as TABLENAME,FILE_SIZE/(1024*1024*1024) as ACTUAL_FILE_SIZE_GB
, round(((data_length + index_length) / 1024 / 1024/1024), 2) as REPORTED_TABLE_SIZE_GB
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s
join INFORMATION_SCHEMA.TABLES t
on NAME = Concat(table_schema,'/',table_name)
order by FILE_SIZE desc
另一种显示所占用的行数和空间并按其排序的方法。
SELECT
table_schema as `Database`,
table_name AS `Table`,
table_rows AS "Quant of Rows",
round(((data_length + index_length) / 1024 / 1024/ 1024), 2) `Size in GB`
FROM information_schema.TABLES
WHERE table_schema = 'yourDatabaseName'
ORDER BY (data_length + index_length) DESC;
在这个查询中唯一需要替换的字符串是“yourDatabaseName”。
SELECT TABLE_NAME AS "Table Name",
table_rows AS "Quant of Rows", ROUND( (
data_length + index_length
) /1024, 2 ) AS "Total Size Kb"
FROM information_schema.TABLES
WHERE information_schema.TABLES.table_schema = 'YOUR SCHEMA NAME/DATABASE NAME HERE'
LIMIT 0 , 30
您可以从“information_schema”-> SCHEMATA表->“SCHEMA_NAME”列中获取模式名称
额外的 你可以得到mysql数据库的大小如下。
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
ORDER BY `DB Size in MB` DESC;
结果
DB Name | DB Size in MB
mydatabase_wrdp 39.1
information_schema 0.0
你可以在这里得到更多的细节。
