MySQL Incremental Backup & Restore Part-I

An incremental backup in MySQL is a backup that only includes changes that have occurred since the last full or incremental backup.

Here is an example of a script for creating an incremental backup of all databases in MySQL using the mysqldump command:

#!/bin/bash

# Set the current date and time
NOW=$(date +"%Y-%m-%d-%H-%M-%S")

# Set the MySQL dump options
OPTIONS="--routines --triggers --events --all-databases --single-transaction --quick --lock-tables=false"

# Set the backup file name and location
BACKUP_FILE="/path/to/backup/mysql-incremental-$NOW.sql"

# Create the incremental backup
mysqldump $OPTIONS -u [username] -p[password] --incremental --incremental-basedir=/path/to/backup/  > $BACKUP_FILE

This script sets the current date and time, sets the MySQL dump options (to include routines, triggers, events, all databases, single-transaction, quick, and lock-tables=false). It sets the backup file name and location. The mysqldump command is then executed with the specified options, username, and password, and the — incremental and — incremental-basedir options to create the incremental backup file.

It’s important to note that the script assumes that you have the mysqldump command in the PATH, and that you have the appropriate permissions to create and restore backups. Also, this script assumes that you have a full backup in the specified — incremental-basedir.

You can also use other tools like Percona Xtrabackup, MySQL Workbench, etc. for incremental backup purpose.

It’s also important to note that the script is not handling any error cases. It’s always good to have a error handling mechanism in the script.

To restore an incremental backup in MySQL, you first need to restore the full backup and then apply the incremental backups in the order they were taken.

Here is an example of a script for restoring an incremental backup of all databases in MySQL using the mysqldump command:

#!/bin/bash

# Set the full backup file name and location
FULL_BACKUP_FILE="/path/to/backup/mysql-full-backup.sql"

# Set the incremental backup file name and location
INCREMENTAL_BACKUP_FILE="/path/to/backup/mysql-incremental-backup-*.sql"

# Restore the full backup
mysql -u [username] -p[password] < $FULL_BACKUP_FILE

# Apply the incremental backups
for file in $INCREMENTAL_BACKUP_FILE;
do
    mysql -u [username] -p[password] < $file
done

This script sets the full backup file name and location, sets the incremental backup file name and location, and uses the mysql command to restore the full backup and apply the incremental backups. The full backup is restored first, and then each incremental backup is applied in the order they were taken using the mysql command.

It’s important to note that the script assumes that you have the mysql command in the PATH, and that you have the appropriate permissions to create and restore backups. Also, you need to make sure that the incremental backups are in the correct order based on when they were taken.

You can also use other tools like Percona Xtrabackup, MySQL Workbench, etc. for incremental backup restore purpose.

It’s also important to note that the script is not handling any error cases. It’s always good to have a error handling mechanism in the script.