Export and Import all MySQL databases at one time

Question

I want to keep a backup of all my MySQL databases. I have more than 100 MySQL databases. I want to export all of them at the same time and again import all of them into my MySQL server at one time. How can I do that?

Answer 1

Export:

mysqldump -u root -p --all-databases > alldb.sql

Look up the documentation for mysqldump. You may want to use some of the options mentioned in comments:

mysqldump -u root -p --opt --all-databases > alldb.sql
mysqldump -u root -p --all-databases --skip-lock-tables > alldb.sql

Import:

mysql -u root -p < alldb.sql

Answer 2

Other solution:

It backs up each database into a different file

#!/bin/bash

USER="zend"
PASSWORD=""
#OUTPUT="/Users/rabino/DBs"

#rm "$OUTPUTDIR/*gz" > /dev/null 2>&1

databases=`mysql -u $USER -p$PASSWORD -e "SHOW DATABASES;" | tr -d "| " | grep -v Database`

for db in $databases; do
    if [[ "$db" != "information_schema" ]] && [[ "$db" != "performance_schema" ]] && [[ "$db" != "mysql" ]] && [[ "$db" != _* ]] ; then
        echo "Dumping database: $db"
        mysqldump -u $USER -p$PASSWORD --databases $db > `date +%Y%m%d`.$db.sql
       # gzip $OUTPUT/`date +%Y%m%d`.$db.sql
    fi
done

Answer 3

All the answers I see on this question can have problems with the character sets in some databases due to the problem of redirecting the exit of mysqldump to a file within the shell operator >.

To solve this problem you should do the backup with this command line. The -r flag does the same as the shell operator > but without the character-set problems.

mysqldump -u root -p --opt --all-databases -r backup.sql

To do a good BD restore without any problem with character sets use these commands (you can change the default-character-set as you need).

mysql -uroot -p --default-character-set=utf8
mysql> SET names 'utf8';
mysql> SOURCE backup.sql;

Answer 4

I wrote this comment already more than 4 years ago and decided now to make it to an answer.

The script from jruzafa can be a bit simplified:

#!/bin/bash

USER="zend"
PASSWORD=""
ExcludeDatabases="Database|information_schema|performance_schema|mysql"
databases=`mysql -u $USER -p$PASSWORD -e "SHOW DATABASES;" | tr -d "| " | egrep -v $ExcludeDatabases`

for db in $databases; do
    echo "Dumping database: $db"
    mysqldump -u $USER -p$PASSWORD --databases $db > `date +%Y%m%d`.$db.sql
done

Note:

1. The excluded databases - prevalently the system tables - are provided in the variable ExcludeDatabases
2. Please be aware that the password is provided in the command line. This is considered as insecure. Study this question.

Answer 5

Based on these answers I've made script which backups all databases into separate files, but then compress them into one archive with date as name.

This will not ask for password, can be used in cron. To store password in .my.cnf check this answer https://serverfault.com/a/143587/62749

Made also with comments for those who are not very familiar with bash scripts.

#!/bin/bash

# This script will backup all mysql databases into 
# compressed file named after date, ie: /var/backup/mysql/2016-07-13.tar.bz2

# Setup variables used later

# Create date suffix with "F"ull date format
suffix=$(date +%F)
# Retrieve all database names except information schemas. Use sudo here to skip root password.
dbs=$(sudo mysql --defaults-extra-file=/root/.my.cnf --batch --skip-column-names -e "SHOW DATABASES;" | grep -E -v "(information|performance)_schema")
# Create temporary directory with "-d" option
tmp=$(mktemp -d)
# Set output dir here. /var/backups/ is used by system, 
# so intentionally used /var/backup/ for user backups.
outDir="/var/backup/mysql"
# Create output file name
out="$outDir/$suffix.tar.bz2"

# Actual script

# Check if output directory exists
if [ ! -d "$outDir" ];then
  # Create directory with parent ("-p" option) directories
  sudo mkdir -p "$outDir"
fi

# Loop through all databases
for db in $dbs; do
  # Dump database to temporary directory with file name same as database name + sql suffix
  sudo mysqldump --defaults-extra-file=/root/.my.cnf --databases "$db" > "$tmp/$db.sql"
done

# Go to tmp dir
cd $tmp

# Compress all dumps with bz2, discard any output to /dev/null
sudo tar -jcf "$out" * > "/dev/null"

# Cleanup
cd "/tmp/"
sudo rm -rf "$tmp"

Answer 6

Why parsing formatted output while the mysql command can do directly what you want?

databases=`mysql -u $USER -p$PASSWORD --batch --skip-column-names -e "SHOW DATABASES;" | grep -E -v "(information|performance)_schema"`

Lists the database names and only this.

Answer 7

Be careful when exporting from and importing to different MySQL versions as the mysql tables may have different columns. Grant privileges may fail to work if you're out of luck. I created this script (mysql_export_grants.sql ) to dump the grants for importing into the new database, just in case:

#!/bin/sh
stty -echo
printf 'Password: ' >&2
read PASSWORD
stty echo
printf "\n"
if [ -z "$PASSWORD" ]; then
        echo 'No password given!'
        exit 1
fi
MYSQL_CONN="-uroot -p$PASSWORD"
mysql ${MYSQL_CONN} --skip-column-names -A -e"SELECT CONCAT('SHOW GRANTS FOR ''',user,'''@''',host,''';') FROM mysql.user WHERE user<>''" | mysql ${MYSQL_CONN} --skip-column-names -A | sed 's/$/;/g'

Answer 8

When you are dumping all database. Obviously it is having large data. So you can prefer below for better:

Creating Backup:

mysqldump -u [user] -p[password]--single-transaction --quick --all-databases | gzip > alldb.sql.gz

If error

-- Warning: Skipping the data of table mysql.event. Specify the --events option explicitly.

Use:

mysqldump -u [user] -p --events --single-transaction --quick --all-databases | gzip > alldb.sql.gz

Restoring Backup:

gunzip < alldb.sql.gz | mysql -u [user] -p[password]

Hope it will help :)

Answer 9

Export database:

for export you can go with this command:

mysqldump -u root -p --all-databases > alldb.sql
              ↓                         ↓
         (you user name)           (file name will be save)

and actually, I wrote this post because there is no reason to back up all the databases in one file. it might cause an error while you're importing it. for example, there are some default databases and there is no reason to back up them.

therefore you should choose databases that you want to backup.

mysqldump -u root -p --databases YourDBName1 YourDBName2 YourDBName3 > tutorials_query1.sql
                                     ↓            ↓            ↓
                             (your databases name that you want to backup)

you can get all the databases name with this command:

sudo mysql -u root -p

and enter your password and then in front of mysql> run this command:

SHOW DATABASES;

---

Import database:

mysql -u root -p < alldb.sql
           ↓            ↓
  (your username)   (it can be the full path like "/home/yoursqlfile.sql")

Answer 10

mysqldump -uroot -proot --all-databases > allDB.sql

note: -u"your username" -p"your password"

Answer 11

Export all databases in Ubuntu

1 - mysqldump -u root -p --databases database1 database2 > ~/Desktop/databases_1_2.sql

OR

2 - mysqldump -u root -p --all_databases > ~/Desktop/all_databases.sql

Answer 12

The below script exports and import databases one by one and keeps deleting sql file after importing. [https://gist.github.com/Shubhamnegi/83b42c4ce80dbc9104c0f9413be17701][1]

Answer 13

I successfully exported all databases using this command.

.\mysqldump -u root -p --all-databases > D:\laragon\tmp\alldb.sql

My Tools: Xampp, Windows Powershell

Answer 14

Another, solution to export or backup all databases without affecting the server performance.

According to this docs, there're three methods to accomplish this task:

1. Backing Up All Databases of a Selected Connection
2. Backing Up the Databases From a List
3. Backing Up the Databases By a Mask

Method 1:

1. Open a plain text editor such as Notepad.

2. Type in the following code:

   Set-Location -Path "C:\Program Files\MySQL\MySQL Server 5.7\bin\" -PassThru
   
   .\mysql.exe --host=localhost --user=root --password=root --skip-column-names --execute="SELECT s.SCHEMA_NAME FROM information_schema.SCHEMATA s WHERE s.SCHEMA_NAME NOT IN ('mysql', 'information_schema', 'sys', 'performance_schema') and s.SCHEMA_NAME like '%$args%' " | Out-File "D:\backup\all_databases_backup\PowerShell\DB_by_mask.txt"
   
    foreach($DBname in Get-Content "D:\backup\all_databases_backup\PowerShell\DB_by_mask.txt")
    {Write-Host $DBname
    &"C:\Program Files\Devart\dbForge Studio for MySQL\dbforgemysql.com" /backup /connection:"User Id=root;Password=root;Host=localhost;Port=3306;Character Set=utf8" /database:$DBname /outputfile:"D:\backup\all_databases_backup\PowerShell\DB_by_mask_backup\$DBname.sql"}
   

Where:

C:\Program Files\MySQL\MySQL Server 5.7\bin\ – server path.

D:\backup\all_databases_backup\PowerShell\DB_by_mask_backup – location at your computer to store output files.

C:\Program Files\Devart\dbForge Studio for MySQL\dbforgemysql.com – dbForge Studio for MySQL path.

3. Assign your own values to the User Id, Password, Host and Port parameters.

4. Save the file with the .PS1 file extension (for example, DB_by_mask_backup.ps1).

Script Execution

You need to execute the script with an extra parameter. For example, DB_by_mask_backup.ps1 test_DB_name.

After the backup has been completed successfully, a folder DB_by_mask_backup with SQL files will be created.