MySQL OPTIMIZE all tables? - mysql

Question

MySQL has an OPTIMIZE TABLE command which can be used to reclaim unused space in a MySQL install. Is there a way (built-in command or common stored procedure) to run this optimization for every table in the database and/or server install, or is this something you'd have to script up yourself?

Answer 1

You can use mysqlcheck to do this at the command line.
One database:
mysqlcheck -o <db_schema_name>
All databases:
mysqlcheck -o --all-databases

Answer 2

I made this 'simple' script:
set #tables_like = null;
set #optimize = null;
set #show_tables = concat("show tables where", ifnull(concat(" `Tables_in_", database(), "` like '", #tables_like, "' and"), ''), " (#optimize:=concat_ws(',',#optimize,`Tables_in_", database() ,"`))");
Prepare `bd` from #show_tables;
EXECUTE `bd`;
DEALLOCATE PREPARE `bd`;
set #optimize := concat('optimize table ', #optimize);
PREPARE `sql` FROM #optimize;
EXECUTE `sql`;
DEALLOCATE PREPARE `sql`;
set #show_tables = null, #optimize = null, #tables_like = null;
To run it, simply paste it in any SQL IDE connected to your database.
Notice: this code WON'T work on phpmyadmin.
How it works
It runs a show tables statement and stores it in a prepared statement. Then it runs a optimize table in the selected set.
You can control which tables to optimize by setting a different value in the var #tables_like (e.g.: set #tables_like = '%test%';).

Answer 3

Following example php script can help you to optimize all tables in your database
<?php
dbConnect();
$alltables = mysql_query("SHOW TABLES");
while ($table = mysql_fetch_assoc($alltables))
{
foreach ($table as $db => $tablename)
{
mysql_query("OPTIMIZE TABLE '".$tablename."'")
or die(mysql_error());
}
}
?>

Answer 4

If you want to analyze, repair and optimize all tables in all databases in your MySQL server, you can do this in one go from the command line. You will need root to do that though.
mysqlcheck -u root -p --auto-repair --optimize --all-databases
Once you run that, you will be prompted to enter your MySQL root password. After that, it will start and you will see results as it's happening.
Example output:
yourdbname1.yourdbtable1 OK
yourdbname2.yourdbtable2 Table is already up to date
yourdbname3.yourdbtable3
note : Table does not support optimize, doing recreate + analyze instead
status : OK
etc..
etc...
Repairing tables
yourdbname10.yourdbtable10
warning : Number of rows changed from 121378 to 81562
status : OK
If you don't know the root password and are using WHM, you can change it from within WHM by going to:
Home > SQL Services > MySQL Root Password

Answer 5

Do all the necessary procedures for fixing all tables in all the databases with a simple shell script:
#!/bin/bash
mysqlcheck --all-databases
mysqlcheck --all-databases -o
mysqlcheck --all-databases --auto-repair
mysqlcheck --all-databases --analyze

Answer 6

From phpMyAdmin and other sources/editors you can use:
SET SESSION group_concat_max_len = 99999999;
SELECT GROUP_CONCAT(concat('OPTIMIZE TABLE `', table_name, '`;') SEPARATOR '') AS O
FROM INFORMATION_SCHEMA.TABLES WHERE
TABLE_TYPE = 'BASE TABLE'
AND table_name!='dual'
AND TABLE_SCHEMA = '<your databasename>'
Then you can copy & paste the result to a new query or execute it from your own source.
If you don't see the whole statement in phpMyAdmin:

Answer 7

for all databases:
mysqlcheck -Aos -uuser -p
For one Database optimization:
mysqlcheck -os -uroot -p dbtest3

Answer 8

From command line:
mysqlcheck -o <db_name> -u<username> -p
then type password

Answer 9

You can optimize/check and repair all the tables of database, using mysql client.
First, you should get all the tables list, separated with ',':
mysql -u[USERNAME] -p[PASSWORD] -Bse 'show tables' [DB_NAME]|xargs|perl -pe 's/ /,/g'
Now, when you have all the tables list for optimization:
mysql -u[USERNAME] -p[PASSWORD] -Bse 'optimize tables [tables list]' [DB_NAME]

Answer 10

my 1 cent, added and TABLE_TYPE='BASE TABLE' so we can skip the 'VIEW' type.
for table in `mysql -sss -e "select concat(table_schema,'.',table_name) from information_schema.tables where table_schema not in ('mysql','information_schema','performance_schema') and TABLE_TYPE='BASE TABLE' order by data_free desc;"`
do
mysql -e "OPTIMIZE TABLE $table;"
done

Answer 11

The MySQL Administrator (part of the MySQL GUI Tools) can do that for you on a database level.
Just select your schema and press the Maintenance button in the bottom right corner.
Since the GUI Tools have reached End-of-life status they are hard to find on the mysql page. Found them via Google: http://dev.mysql.com/downloads/gui-tools/5.0.html
I don't know if the new MySQL Workbench can do that, too.
And you can use the mysqlcheck command line tool which should be able to do that, too.

Answer 12

A starter bash script to list and run a tool against the DBs...
#!/bin/bash
declare -a dbs
unset opt
for each in $(echo "show databases;" | mysql -u root) ;do
dbs+=($each)
done
echo " The system found [ ${#dbs[#]} ] databases." ;sleep 2
echo
echo "press 1 to run a check"
echo "press 2 to run an optimization"
echo "press 3 to run a repair"
echo "press 4 to run check,repair, and optimization"
echo "press q to quit"
read input
case $input in
1) opt="-c"
;;
2) opt="-o"
;;
3) opt="-r"
;;
4) opt="--auto-repair -c -o"
;;
*) echo "Quitting Application .."; exit 7
;;
esac
[[ -z $opt ]] && exit 7;
echo " running option: mysqlcheck $opt in 5 seconds on all Dbs... "; sleep 5
for ((i=0; i<${#dbs[#]}; i++)) ;do
echo "${dbs[$i]} : "
mysqlcheck $opt ${dbs[$i]} -u root
done

Answer 13

If you are accessing database directly then you can write following query:
OPTIMIZE TABLE table1,table2,table3,table4......;

Answer 14

This bash script will accept the root password as option and optimize it one by one, with status output:
#!/bin/bash
if [ -z "$1" ] ; then
echo
echo "ERROR: root password Parameter missing."
exit
fi
MYSQL_USER=root
MYSQL_PASS=$1
MYSQL_CONN="-u${MYSQL_USER} -p${MYSQL_PASS}"
TBLLIST=""
COMMA=""
SQL="SELECT CONCAT(table_schema,'.',table_name) FROM information_schema.tables WHERE"
SQL="${SQL} table_schema NOT IN ('information_schema','mysql','performance_schema')"
for DBTB in `mysql ${MYSQL_CONN} -ANe"${SQL}"`
do
echo OPTIMIZE TABLE "${DBTB};"
SQL="OPTIMIZE TABLE ${DBTB};"
mysql ${MYSQL_CONN} -ANe"${SQL}"
done

Answer 15

my 2cents: start with table with highest fragmentation
for table in `mysql -sss -e "select concat(table_schema,".",table_name) from information_schema.tables where table_schema not in ('mysql','information_schema','performance_schema') order by data_free desc;"
do
mysql -e "OPTIMIZE TABLE $table;"
done

Answer 16

If local moderators allow this, I would like to promote a PHP library I wrote quite some time ago - https://github.com/Simbiat/optimize-tables
The point of the library is to allow "smart" execution of the OPTIMIZE, ANALYZE, CHECK and REPAIR commands depending on table's parameters and statistics. I've been running it in CRON for https://simbiat.ru for over 2 years now and it has been smooth sailing (aside from some adjustments and minor fixes, of course).
Why would you want to use something like this? Well, the README provides some more details, but in short, it can help with running relevant operations only when you can actually benefit from them. At the least, it can save your resources.