用percona-xtrabackup工具写一个mysql增量备份的脚本

很高兴回答你的问题。对于使用Percona XtraBackup工具来实现MySQL增量备份的脚本，您可以参考以下代码：

#!/bin/bash
# MySQL credentials
user="username"
password="password"
host="localhost"
db_name="database_name"

# Backup directory
backup_path="/path/to/backup/folder"

# Timestamp (sortable AND readable)
timestamp=$(date +%Y-%m-%d_%H-%M-%S)

# Full backup file name
full_backup_name="$db_name-$timestamp-full-backup.sql"

# Incremental backup file name
incremental_backup_name="$db_name-$timestamp-incremental-backup.sql"

# Log file
log_file="$backup_path/backup.log"

# Number of days to keep daily backups
backup_retention=7

# Create backup folder
mkdir -p $backup_path

# Remove backups older than retention period
find $backup_path/* -mtime +$backup_retention -exec rm {} \;

# Lock tables to get consistent backup
mysql --user=$user --password=$password --host=$host --execute="FLUSH TABLES WITH READ LOCK;"

# Full backup
echo "Starting full backup..."
xtrabackup --backup --user=$user --password=$password --host=$host --target-dir=$backup_path --no-lock --parallel=4 --extra-lsndir=$backup_path --backup-and-apply-log-only > $log_file 2>&1
echo "Full backup complete: $full_backup_name"

# Unlock tables to restore normal operation
mysql --user=$user --password=$password --host=$host --execute="UNLOCK TABLES;"

# Sleep to ensure that next backup is incremental
sleep 10

# Incremental backup
echo "Starting incremental backup..."
xtrabackup --backup --user=$user --password=$password --host=$host --target-dir=$backup_path --no-lock --parallel=4 --extra-lsndir=$backup_path --backup-and-apply-log-only --incremental-basedir=$backup_path > $log_file 2>&1
echo "Incremental backup complete: $incremental_backup_name"

# Unlock tables to restore normal operation
mysql --user=$user --password=$password --host=$host --execute="UNLOCK TABLES;"

# Compress backups
echo "Compressing backups..."
gzip -9 $backup_path/*.sql
echo "Compression complete."

# Done!
echo "All backups complete."