MySQL OPTIMIZE all tables?

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 o

Answer 1

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 2

From command line:

mysqlcheck -o <db_name> -u<username> -p

then type password

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

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 5

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 6

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