我可以运行此查询来获取MySQL数据库中所有表的大小:
show table status from myDatabaseName;
我想在理解结果方面提供一些帮助。我正在寻找最大尺寸的桌子。
我应该看哪一栏?
答案 0 :(得分:1679)
您可以使用此查询来显示表的大小(尽管您需要先替换变量):
SELECT
table_name AS `Table`,
round(((data_length + index_length) / 1024 / 1024), 2) `Size in MB`
FROM information_schema.TABLES
WHERE table_schema = "$DB_NAME"
AND table_name = "$TABLE_NAME";
或此查询列出每个数据库中每个表的大小,最大的第一个:
SELECT
table_schema as `Database`,
table_name AS `Table`,
round(((data_length + index_length) / 1024 / 1024), 2) `Size in MB`
FROM information_schema.TABLES
ORDER BY (data_length + index_length) DESC;
答案 1 :(得分:86)
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 ” - >获取架构名称 SCHEMATA 表格 - > “ SCHEMA_NAME ”栏目
其他强> 您可以获得大小的mysql数据库,如下所示。
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;
<强>结果强>
DB Name | DB Size in MB
mydatabase_wrdp 39.1
information_schema 0.0
答案 2 :(得分:34)
SELECT
table_name AS "Table",
round(((data_length + index_length) / 1024 / 1024), 2) as size
FROM information_schema.TABLES
WHERE table_schema = "YOUR_DATABASE_NAME"
ORDER BY size DESC;
这会对大小进行排序(DB大小,以MB为单位)。
答案 3 :(得分:21)
如果要查询使用当前选定的数据库。只需复制粘贴此查询即可。 (无需修改)
SELECT table_name ,
round(((data_length + index_length) / 1024 / 1024), 2) as SIZE_MB
FROM information_schema.TABLES
WHERE table_schema = DATABASE() ORDER BY SIZE_MB DESC;
答案 4 :(得分:13)
使用Workbench可以轻松获取许多信息:
右键单击架构名称,然后单击&#34;架构检查器&#34;。
在结果窗口中,您有多个标签。第一个标签 &#34;信息&#34;以MB为单位显示数据库大小的粗略估计。
第二个标签&#34; Tables&#34;,显示每个表的数据长度和其他详细信息。
答案 5 :(得分:9)
假设您的数据库名称为 &#34; news_alert&#34;。 然后此查询将显示数据库中所有表的大小。
所有表格的大小:
SELECT
TABLE_NAME AS `Table`,
ROUND(((DATA_LENGTH + INDEX_LENGTH) / 1024 / 1024),2) AS `Size (MB)`
FROM
information_schema.TABLES
WHERE
TABLE_SCHEMA = "news_alert"
ORDER BY
(DATA_LENGTH + INDEX_LENGTH)
DESC;
<强>输出:强>
+---------+-----------+
| Table | Size (MB) |
+---------+-----------+
| news | 0.08 |
| keyword | 0.02 |
+---------+-----------+
2 rows in set (0.00 sec)
具体表:
SELECT
TABLE_NAME AS `Table`,
ROUND(((DATA_LENGTH + INDEX_LENGTH) / 1024 / 1024),2) AS `Size (MB)`
FROM
information_schema.TABLES
WHERE
TABLE_SCHEMA = "news_alert"
AND
TABLE_NAME = "news"
ORDER BY
(DATA_LENGTH + INDEX_LENGTH)
DESC;
<强>输出:强>
+-------+-----------+
| Table | Size (MB) |
+-------+-----------+
| news | 0.08 |
+-------+-----------+
1 row in set (0.00 sec)
答案 6 :(得分:7)
尝试以下shell命令(将DB_NAME
替换为您的数据库名称):
mysql -uroot <<<"SELECT table_name AS 'Tables', round(((data_length + index_length) / 1024 / 1024), 2) 'Size in MB' FROM information_schema.TABLES WHERE table_schema = \"DB_NAME\" ORDER BY (data_length + index_length) DESC;" | head
对于Drupal / drush解决方案,请检查以下示例脚本,该脚本将显示正在使用的最大表:
#!/bin/sh
DB_NAME=$(drush status --fields=db-name --field-labels=0 | tr -d '\r\n ')
drush sqlq "SELECT table_name AS 'Tables', round(((data_length + index_length) / 1024 / 1024), 2) 'Size in MB' FROM information_schema.TABLES WHERE table_schema = \"${DB_NAME}\" ORDER BY (data_length + index_length) DESC;" | head -n20
答案 7 :(得分:6)
如果您使用的是phpmyadmin,那么只需转到表结构
e.g。
Space usage
Data 1.5 MiB
Index 0 B
Total 1.5 Mi
答案 8 :(得分:5)
这是使用bash命令行解决此问题的另一种方法。
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
答案 9 :(得分:4)
改编自ChapMic的答案以满足我的特殊需要。
仅指定数据库名称,然后按降序对所有表进行排序 - 从所选数据库中的LARGEST到SMALLEST表。只需要替换1个变量=您的数据库名称。
SELECT
table_name AS `Table`,
round(((data_length + index_length) / 1024 / 1024), 2) AS `size`
FROM information_schema.TABLES
WHERE table_schema = "YOUR_DATABASE_NAME_HERE"
ORDER BY size DESC;
答案 10 :(得分:2)
另一种显示行数和占用空间以及按顺序排序的方法。
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;
您必须在此查询中替换的唯一字符串是“yourDatabaseName”。
答案 11 :(得分:1)
如果您拥有ssh
访问权限,则可能只想尝试du -hc /var/lib/mysql
(或datadir
中设置的my.cnf
)。
答案 12 :(得分:1)
计算最后的数据库总大小:
(SELECT
table_name AS `Table`,
round(((data_length + index_length) / 1024 / 1024), 2) `Size in MB`
FROM information_schema.TABLES
WHERE table_schema = "$DB_NAME"
)
UNION ALL
(SELECT
'TOTAL:',
SUM(round(((data_length + index_length) / 1024 / 1024), 2) )
FROM information_schema.TABLES
WHERE table_schema = "$DB_NAME"
)
答案 13 :(得分:1)
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;
答案 14 :(得分:1)
SELECT TABLE_NAME AS table_name,
table_rows AS QuantofRows,
ROUND((data_length + index_length) /1024, 2 ) AS total_size_kb
FROM information_schema.TABLES
WHERE information_schema.TABLES.table_schema = 'db'
ORDER BY (data_length + index_length) DESC;
以上所有2个均在mysql上进行了测试
答案 15 :(得分:1)
我发现现有答案实际上并没有给出磁盘上表的大小,这会更有帮助。 与基于data_length的表大小相比,该查询提供了更准确的磁盘估计 和索引。我必须将它用于无法物理检查磁盘和检查文件大小的AWS RDS实例。
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
答案 16 :(得分:0)
select x.dbname as db_name, x.table_name as table_name, x.bytesize as the_size from
(select
table_schema as dbname,
sum(index_length+data_length) as bytesize,
table_name
from
information_schema.tables
group by table_schema
) x
where
x.bytesize > 999999
order by x.bytesize desc;