How to get the sizes of the tables of a MySQL database?

Question

I can run this query to get the sizes of all tables in a MySQL database:

show table status from myDatabaseName;

I would like some help in understanding the results. I am looking for tables with the largest sizes.

Which column should I look at?

What do you mean by size? Number of rows? Bytes taken on disk? — Mark Byers
@Mark i want size on disk is this right method ? # du -sh /mnt/mysql_data/openx/f_scraper_banner_details.MYI 79G /mnt/mysql_data/openx/f_scraper_banner_details.MYI — Ashish Karpe
Related, if it’s of interest, I wrote a Describe All Tables in this Answer. — Drew

George Garchagudashvili · Accepted Answer · 2012-03-08T15:34:46

You can use this query to show the size of a table (although you need to substitute the variables first):

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";

or this query to list the size of every table in every database, largest first:

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;

Thank you, its working just fine, though I am not sure it takes Blobs in consideration. — David
Note, you can also use “IN” to specify multiple tables, e.g AND table_name IN ('table_1', 'table_2', 'table_3'); — David Thomas
AFAICT, this will only count the lengths of static size fields correctly. How would you count VARCHAR and BLOB types? — l0b0
@kasimir At some point the world got confusing and some standards organizations and hardware manufacturers decided that it was better that a kilobyte be defined on the decimal system. The IEC standard now calls the base 2 kilobyte (1024 bytes) a kibibyte (KiB). At any rate, MySQL doesn’t know, so if you want IEC decimal kilobytes, divide by 1000. — russellpierce
Will this work for the InnoDB storage engine? According to mysql doc here – dev.mysql.com/doc/refman/5.7/en/show-table-status.html, the data_length field for that engine contains the size of the clustered index. That won’t correctly represent the size of the data. Will it? — euphoria83

hanshenrik · Accepted Answer · 2012-09-15T17:41:29

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

You can get schema name from “information_schema” -> SCHEMATA table -> “SCHEMA_NAME” column

Additional
You can get size of the mysql databases as following.

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;

Result

DB Name              |      DB Size in MB

mydatabase_wrdp             39.1
information_schema          0.0

You can get additional details in here.

Nicolas Raoul · Accepted Answer · 2014-01-18T15:09:58

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;

This sorts the sizes (DB Size in MB).

zainengineer · Accepted Answer · 2017-02-16T00:56:34

If you want a query to use currently selected database. simply copy paste this query. (No modification required)

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;

Or even shorter (without subquery): SELECT table_name, round(((data_length + index_length) / 1024 / 1024), 2) SIZE_MB FROM information_schema.TABLES WHERE table_schema=DATABASE() ORDER BY (data_length + index_length) ASC; — Onkeltem

Nurul Akter Towhid · Accepted Answer · 2017-09-10T17:54:35

Size of all tables:

Suppose your database or TABLE_SCHEMA name is “news_alert”. Then this query will show the size of all tables in the database.

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;

Output:

    +---------+-----------+
    | Table   | Size (MB) |
    +---------+-----------+
    | news    |      0.08 |
    | keyword |      0.02 |
    +---------+-----------+
    2 rows in set (0.00 sec)

For the specific table:

Suppose your TABLE_NAME is “news”. Then SQL query will be-

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;

Output:

+-------+-----------+
| Table | Size (MB) |
+-------+-----------+
| news  |      0.08 |
+-------+-----------+
1 row in set (0.00 sec)

Guppy · Accepted Answer · 2015-02-27T15:29:16

There is an easy way to get many informations using Workbench:

Right-click the schema name and click “Schema inspector”.
In the resulting window you have a number of tabs. The first tab
“Info” shows a rough estimate of the database size in MB.
The second tab, “Tables”, shows Data length and other details for each table.

Great!!! In MySQL Workbench there’s also a “Table Inspector” for each table. Not properly quick but very handy! — T30

kenorb · Accepted Answer · 2014-05-08T11:27:01

Try the following shell command (replace DB_NAME with your database name):

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

For Drupal/drush solution, check the following example script which will display the biggest tables in use:

#!/bin/sh
DB_NAME=$(drush status --fields=db-name --field-labels=0 | tr -d 'rn ')
drush sqlq "SELECT table_name AS 'Tables', round(((data_length + index_length) / 1024 / 1024), 2) 'Size in MB' FROM information_schema.TABLES WHERE table_schema = "${DB_NAME}" ORDER BY (data_length + index_length) DESC;" | head -n20

user1380599 · Accepted Answer · 2014-11-10T11:06:34

Heres another way of working this out from using the bash command line.

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

Almis · Accepted Answer · 2015-03-21T14:05:27

If you are using phpmyadmin then just go to the table structure

e.g.

Space usage
Data    1.5 MiB
Index   0   B
Total   1.5 Mi

dev101 · Accepted Answer · 2017-03-31T23:16:40

Adapted from ChapMic’s answer to suite my particular need.

Only specify your database name, then sort all the tables in descending order – from LARGEST to SMALLEST table inside selected database. Needs only 1 variable to be replaced = your database name.

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;

Nav · Accepted Answer · 2017-02-13T06:06:07

Another way of showing the number of rows and space occupied and ordering by it.

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;

The only string you have to substitute in this query is “yourDatabaseName”.

exic · Accepted Answer · 2017-07-17T15:54:16

If you have ssh access, you might want to simply try du -hc /var/lib/mysql (or different datadir, as set in your my.cnf) as well.

Finally an answer that doesn’t rely on information_schema. In my case it reported 660MB while the actual size on the filesystem is 1.8GB — php_nub_qq

Ryum Aayur · Accepted Answer · 2019-05-02T09:14:20

I find the existing answers don’t actually give the size of tables on the disk, which is more helpful.
This query gives more accurate disk estimate compared to table size based on data_length
& index. I had to use this for an AWS RDS instance where you cannot physically examine the disk and check file sizes.

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,"https://stackoverflow.com/",table_name)
order by FILE_SIZE desc

this should be the answer, for INNODB at least. Just adding up DATA_LENGTH, INDEX_LENGTH & DATA_FREE doesn’t get the size on Disk if you have large out-of-row data fields (like blobs). For INNODB you do need to use INNDB_SYS_TABLESPACES.FILE_SIZE to get an accurate read of the on disk size, but you also need PROCESS privilege to select from this table. — MNB

William · Accepted Answer · 2018-09-04T03:11:24

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;

all 2 above is tested on mysql

Arsen Khachaturyan · Accepted Answer · 2018-09-04T03:08:15

This should be tested in mysql, not 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;

While this might answer the authors question, it lacks some explaining words and/or links to documentation. Raw code snippets are not very helpful without some phrases around them. You may also find how to write a good answer very helpful. Please edit your answer – From Review — Nick
Sorry, I don’t know the answer to that – I’m not a moderator. — Nick

janith1024 · Accepted Answer · 2018-07-18T05:58:41

Calculate the total size of the database at the end:

(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"
)

Zach · Accepted Answer · 2020-11-18T20:11:16

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;

Thibault Richard · Accepted Answer · 2021-09-23T12:37:36

I’ve made this shell script to keep a track of table size (in bytes and in number of rows)

#!/bin/sh

export MYSQL_PWD=XXXXXXXX
TABLES="table1 table2 table3"

for TABLE in $TABLES;
do
        FILEPATH=/var/lib/mysql/DBNAME/$TABLE.ibd
        TABLESIZE=`wc -c $FILEPATH | awk '{print $1}'`
        #Size in Bytes
        mysql -D scarprd_self -e "INSERT INTO tables_sizes (table_name,table_size,measurement_type) VALUES ('$TABLE', '$TABLESIZE', 'BYTES');"
        #Size in rows
        ROWSCOUNT=$(mysql -D scarprd_self -e "SELECT COUNT(*) AS ROWSCOUNT FROM $TABLE;")
        ROWSCOUNT=${ROWSCOUNT//ROWSCOUNT/}
        mysql -D scarprd_self -e "INSERT INTO tables_sizes (table_name,table_size,measurement_type) VALUES ('$TABLE', '$ROWSCOUNT', 'ROWSCOUNT');"
        mysql -D scarprd_self -e "DELETE FROM tables_sizes WHERE measurement_datetime < TIMESTAMP(DATE_SUB(NOW(), INTERVAL 365 DAY));"
done

It presuppose to have this MySQL table

CREATE TABLE `tables_sizes` (
  `table_name` VARCHAR(128) NOT NULL,
  `table_size` VARCHAR(25) NOT NULL,
  `measurement_type` VARCHAR(10) NOT NULL CHECK (measurement_type IN ('BYTES','ROWSCOUNT')),
  `measurement_datetime` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP()
) ENGINE=INNODB DEFAULT CHARSET=utf8

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How to get the sizes of the tables of a MySQL database?

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