MySQLTable By Table Backup With Auto Rotation, For Easy Restoration Of Partial/Full Database

#!/bin/bash
# Database Backup script.
# Created By: Mohammed Salih
# Senior System Administrator
# Date: 21/06/2007
#
# Database credentials
DB_USER=root
#Please append password in the xxxxx section below, note that there is
# no space between -p and xxxxx
DB_PASS="-pxxxxxxx"
# Get list of Databases except the pid file
DBS_LIST=$(echo "show databases;"|mysql -u $DB_USER $DB_PASS -N)
# Log file
BAKUP_LOG=/backup/log/db-backup.log
# Backup Base directory
BASE_BAK_FLDR=/backup/db
# Backup rotation period.
RM_FLDR_DAYS="+30"
# From here, only edit if you know what you are doing.
index=0
# Check if we can connect to the mysql server; otherwise die
if [ ! "$(id -u -n)" = "mysql" ]; then
echo -e "Error:: $0 : Only user 'mysql' can run this script"
exit 100
fi
PING=$(mysqladmin ping -u $DB_USER $DB_PASS 2>/dev/null)
if [ "$PING" != "mysqld is alive" ]; then
echo "Error:: Unable to connected to MySQL Server, exiting !!"
exit 101
fi
# Backup process starts here.
# Flush logs prior to the backup.
mysql -u $DB_USER $DB_PASS -e "FLUSH LOGS"
# Loop through the DB list and create table level backup,
# applying appropriate option for MyISAM and InnoDB tables.
for DB in $DBS_LIST; do
DB_BKP_FLDR=$BASE_BAK_FLDR/$(date +%d-%m-%Y)/$DB
[ ! -d $DB_BKP_FLDR ] && mkdir -p $DB_BKP_FLDR
# Get the schema of database with the stored procedures.
# This will be the first file in the database backup folder
mysqldump -u $DB_USER $DB_PASS -R -d --single-transaction $DB | \
gzip -c > $DB_BKP_FLDR/000-DB_SCHEMA.sql.gz
index=0
#Get the tables and its type. Store it in an array.
table_types=($(mysql -u $DB_USER $DB_PASS -e "show table status from $DB" | \
awk '{ if ($2 == "MyISAM" || $2 == "InnoDB") print $1,$2}'))
table_type_count=${#table_types[@]}
# Loop through the tables and apply the mysqldump option according to the table type
# The table specific SQL files will not contain any create info for the table schema.
# It will be available in SCHEMA file
while [ "$index" -lt "$table_type_count" ]; do
START=$(date +%s)
TYPE=${table_types[$index + 1]}
table=${table_types[$index]}
echo -en "$(date) : backup $DB : $table : $TYPE "
if [ "$TYPE" = "MyISAM" ]; then
DUMP_OPT="-u $DB_USER $DB_PASS $DB --no-create-info --tables "
else
DUMP_OPT="-u $DB_USER $DB_PASS $DB --no-create-info --single-transaction --tables"
fi
mysqldump $DUMP_OPT $table |gzip -c > $DB_BKP_FLDR/$table.sql.gz
index=$(($index + 2))
echo -e " - Total time : $(($(date +%s) - $START))\n"
done
done
# Rotating old backup. according to the 'RM_FLDR_DAYS'
if [ ! -z "$RM_FLDR_DAYS" ]; then
echo -en "$(date) : removing folder : "
find $BASE_BAK_FLDR/ -maxdepth 1 -mtime $RM_FLDR_DAYS -type d -exec rm -rf {} \;
echo

For example, if you have taken the backup of "bigdb" on 1st Jan 2007, then the backup will be kept in
$BKP_BASE_FLDR/01-01-2007/bigdb
Following command/script is an example for restoring a database called bigdb for which the backup was taken on 1st Jan 2007.
cd /backup/01-01-2007/bigdb;
for table in *; do gunzip -c $table | mysql -u root -pSecret bigdb_new; done.