增备1
做增量备份前,是需要进行一次完成备份的
1、做数据修改
创建一个add1.t1
t1 包含:id,name
加2条数据
id | name |
+----+------+
| 1 | add1 |
| 2 | add2 |
+----+------+
操作如下:
MySQL root@(none):(none)> show databases;
+--------------------+
| Database |
+--------------------+
| db711 |
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
5 rows in set
Time: 0.022s
MySQL root@(none):(none)> create database add1;
Query OK, 1 row affected
Time: 0.006s
MySQL root@(none):(none)> use add1;
You are now connected to database "add1" as user "root"
Time: 0.000s
MySQL root@(none):add1> create table t1 (id int,name varchar(10));
Query OK, 0 rows affected
Time: 0.024s
MySQL root@(none):add1> desc t1;
+-------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| id | int | YES | | <null> | |
| name | varchar(10) | YES | | <null> | |
+-------+-------------+------+-----+---------+-------+
2 rows in set
Time: 0.017s
MySQL root@(none):add1> insert into t1 values (1,'add1'),(2,'add2');
Query OK, 2 rows affected
Time: 0.026s
MySQL root@(none):add1> select * from t1;
+----+------+
| id | name |
+----+------+
| 1 | add1 |
| 2 | add2 |
+----+------+
2 rows in set
Time: 0.012s
MySQL root@(none):add1> show databases;
+--------------------+
| Database |
+--------------------+
| add1 |
| db711 |
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
2、开始增量备份
xtrabackup --defaults-file=/etc/my.cnf --backup --target-dir=/data/backup/inc1/ --incremental-basedir=/data/backup/base/ -u root -pLixinyi@123 -H localhost -P 3306 --no-server-version-check
注释:
--defaults-file 默认文件
--backup 备份
--target-dir 备份存放的目录,要单独存放 此时为/data/backup/inc1/
注意此时就不要放在完全备份的文件夹(data/backup/base)中
如果还放在这里,无法进行区分,会产生冲突
incremental-basedir 增量备份参照的文件(参照谁进行增量)
显示如下,表示增量备份完成:
增备2:
1、进行数据修改,
在上面用到过的表add1.t1,添加数据
id 3, name “增量2”
id 4 , name “增量2”
MySQL root@(none):(none)> use add1;
You are now connected to database "add1" as user "root"
Time: 0.001s
MySQL root@(none):add1> select * from t1;
+----+------+
| id | name |
+----+------+
| 1 | add1 |
| 2 | add2 |
+----+------+
2 rows in set
Time: 0.012s
MySQL root@(none):add1> insert into t1 values (3,'增量2'),(4,'增量2');
Query OK, 2 rows affected
Time: 0.004s
MySQL root@(none):add1> select * from t1;
+----+-------+
| id | name |
+----+-------+
| 1 | add1 |
| 2 | add2 |
| 3 | 增量2 |
| 4 | 增量2 |
+----+-------+
2、开始增量备份
xtrabackup --defaults-file=/etc/my.cnf --backup --target-dir=/data/backup/inc2/ --incremental-basedir=/data/backup/inc1/ -u root -pLixinyi@123 -H localhost -P 3306 --no-server-version-check
--target-dir=/data/backup/inc2/ 用了存储第二次的增量备份文件
incremental-basedir=/data/backup/inc1/ 第二次要参照第一次进行备份(增量备份参照上一次)
恢复增量备份
-
还原的时候,要先准备好完整备份
-
然后再还原增量备份,这样数据才是完整的
注意最后一次把增量备份恢复到全部不要加 --apply-log-only
应用完整备份:
xtrabackup --defaults-file=/etc/my.cnf --prepare --apply-log-only --target-dir=/data/backup/base/ --no-server-version-check
应用增量1:
xtrabackup --defaults-file=/etc/my.cnf --prepare --apply-log-only --target-dir=/data/backup/base/ --incremental-dir=/data/backup/inc1/ --no-server-version-check
应用增量2:
注意不要偷懒
注意,这是最后一次的增量,就 不要输入–apply-log-only
xtrabackup --defaults-file=/etc/my.cnf --prepare --target-dir=/data/backup/base/ --incremental-dir=/data/backup/inc2 --no-server-version-check
这几步 --defaults-file=““ 选项可以不用加
恢复到数据目录
全库级恢复要先停止数据库并清空数据目录
如果不这样做,当前数据库内有某张表,又还原进同样的表,会产生冲突
systemctl stop mysqld
rm -rf /var/lib/mysql/*
xtrabackup --defaults-file=/etc/my.cnf --copy-back --target-dir=/data/backup/base/
chown -R mysql.mysql /var/lib/mysql
systemctl start mysqld
mycli -uroot -pLxinyi@123
查看数据的完整性:
成功!
[root@localhost ~]# mycli -uroot -pLixinyi@123
Connecting to socket /var/lib/mysql/mysql.sock, owned by user mysql
MySQL
mycli 1.27.2
Home: http://mycli.net
Bug tracker: https://github.com/dbcli/mycli/issues
Thanks to the contributor - Jerome Provensal
MySQL root@(none):(none)> show databases;
+--------------------+
| Database |
+--------------------+
| add1 |
| db711 |
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
6 rows in set
Time: 0.020s
MySQL root@(none):(none)> use add1;
You are now connected to database "add1" as user "root"
Time: 0.000s
MySQL root@(none):add1> select * from t1;
+----+-------+
| id | name |
+----+-------+
| 1 | add1 |
| 2 | add2 |
| 3 | 增量2 |
| 4 | 增量2 |
+----+-------+
4 rows in set
Time: 0.029s
标签:none,add1,--,backup,备份,MySQL,增量,root
From: https://blog.csdn.net/l_789rty/article/details/140447366