通過上述方法可以快速備份恢復(fù)大數(shù)據(jù)量的庫，也可以同時(shí)指定多個(gè)庫，單張表或多張表進(jìn)行恢復(fù)。可參考官方文檔 Partial Backups - Percona XtraBackup。
1.概述
本文通過 XtraBackup 備份單個(gè)數(shù)據(jù)庫，然后恢復(fù)到另一個(gè)實(shí)例，用于快速遷移大數(shù)據(jù)量，使用的軟件版本為：
軟件名
| 版本
|
MySQL
| mysql-5.7.39-linux-glibc2.12-x86_64.tar.gz
|
XtraBackup
| percona-xtrabackup-24-2.4.26-1.el7.x86_64.rpm
|
在2臺主機(jī)分別安裝一個(gè)MySQL實(shí)例：
主機(jī)
| IP地址
| 端口號
|
MySQL-A
| 192.168.100.10
| 5508
|
MySQL-B
| 192.168.100.11
| 5508
|
2.在MySQL-A初始化數(shù)據(jù)
通過sysbench 初始化數(shù)據(jù)，10張表，每張表10000條記錄
shell> sysbench src/lua/oltp_read_write.lua --mysql-db=sysbench --mysql-host=192.168.100.10 --mysql-port=5508 --mysql-user=greatsql --mysql-password='greatsql' --tables=10 --table_size=10000 --report-interval=2 --threads=50 --time=1000 --mysql_storage_engine=innodb --partitions=3 --skip_trx=0 --mysql-ignore-errors=all prepare
3.通過 xtrabackup 備份 MySQL-A 的 sysbench 庫
shell> innobackupex --defaults-file=/mysql/conf/my5508.cnf --user greatsql --password greatsql -H127.0.0.1 -P5508 --databases sysbench /mysql/dbbackup
...
...
221229 10:11:17 Executing UNLOCK TABLES
221229 10:11:17 All tables unlocked
221229 10:11:17 [00] Copying ib_buffer_pool to /mysql/dbbackup/2022-12-29_10-11-07/ib_buffer_pool
221229 10:11:17 [00] ...done
221229 10:11:17 Backup created in directory '/mysql/dbbackup/2022-12-29_10-11-07/'
MySQL binlog position: filename 'binlog.000005', position '190', GTID of the last change '3e362a47-8683-11ed-92e1-00163ed294ac:1-87'
221229 10:11:17 [00] Writing /mysql/dbbackup/2022-12-29_10-11-07/backup-my.cnf
221229 10:11:17 [00] ...done
221229 10:11:17 [00] Writing /mysql/dbbackup/2022-12-29_10-11-07/xtrabackup_info
221229 10:11:17 [00] ...done
xtrabackup: Transaction log of lsn (1123405728) to (1123405737) was copied.
221229 10:11:17 completed OK!
4.備份 MySQL-A sysbench 庫的表結(jié)構(gòu)
shell> /mysql/svr/mysql/bin/mysqldump -ugreatsql -pgreatsql -h127.0.0.1 -P5508 --single-transaction --set-gtid-purged=OFF --master-data=2 -d -B sysbench > sysbench.sql
mysqldump: [Warning] Using a password on the command line interface can be insecure.
5.將備份的 sysbench 庫的表結(jié)構(gòu)導(dǎo)入 MySQL-B
shell> /mysql/svr/mysql/bin/mysql -ugreatsql -pgreatsql -h192.168.100.11 -P5508 < sysbench.sql
mysql: [Warning] Using a password on the command line interface can be insecure.
6.登錄 MySQL-B 生成丟棄/導(dǎo)入表空間的 SQL 語句
# 生成丟棄表空間的SQL
mysql> select concat('alter table ',table_schema,'.',TABLE_NAME , ' discard tablespace', ';') from information_schema.tables where TABLE_SCHEMA = 'sysbench' into outfile '/tmp/discard.sql';
Query OK, 10 rows affected (0.00 sec)
# 生成導(dǎo)入表空間的SQL
mysql> select concat('alter table ',table_schema,'.',TABLE_NAME , ' import tablespace', ';') from information_schema.tables where TABLE_SCHEMA = 'sysbench' into outfile '/tmp/import.sql';
Query OK, 10 rows affected (0.01 sec)
7.登錄 MySQL-B 執(zhí)行丟棄表空間的 SQL 語句
mysql> source /tmp/discard.sql;
8.查看 MySQL-B 底層數(shù)據(jù)文件
shell> ll -h /mysql/dbdata/data5508/data/sysbench/
total 124K
-rw-r----- 1 mysql mysql 67 Dec 29 10:25 db.opt
-rw-r----- 1 mysql mysql 8.5K Dec 29 10:25 sbtest10.frm
-rw-r----- 1 mysql mysql 8.5K Dec 29 10:25 sbtest1.frm
-rw-r----- 1 mysql mysql 8.5K Dec 29 10:25 sbtest2.frm
-rw-r----- 1 mysql mysql 8.5K Dec 29 10:26 sbtest3.frm
-rw-r----- 1 mysql mysql 8.5K Dec 29 10:26 sbtest4.frm
-rw-r----- 1 mysql mysql 8.5K Dec 29 10:26 sbtest5.frm
-rw-r----- 1 mysql mysql 8.5K Dec 29 10:26 sbtest6.frm
-rw-r----- 1 mysql mysql 8.5K Dec 29 10:26 sbtest7.frm
-rw-r----- 1 mysql mysql 8.5K Dec 29 10:26 sbtest8.frm
-rw-r----- 1 mysql mysql 8.5K Dec 29 10:26 sbtest9.frm
可以看到ibd文件已被丟棄
9.prepare 備份文件
注意這里需要加 --export 選項(xiàng)，它允許導(dǎo)出單個(gè)表以進(jìn)行導(dǎo)入到另一個(gè)服務(wù)器
shell> innobackupex --apply-log --export /mysql/dbbackup/2022-12-29_10-11-07
xtrabackup: recognized server arguments: --innodb_checksum_algorithm=crc32 --innodb_log_checksum_algorithm=strict_crc32 --innodb_data_file_path=ibdata1:12M:autoextend --innodb_log_files_in_group=4 --innodb_log_file_size=33554432 --innodb_fast_checksum=0 --innodb_page_size=16384 --innodb_log_block_size=512 --innodb_undo_directory=/mysql/dbdata/data5508/log --innodb_undo_tablespaces=0 --server-id=2 --redo-log-version=1
xtrabackup: recognized client arguments:
221229 10:56:58 innobackupex: Starting the apply-log operation
IMPORTANT: Please check that the apply-log run completes successfully.
At the end of a successful apply-log run innobackupex
prints "completed OK!".
...
...
xtrabackup: starting shutdown with innodb_fast_shutdown = 0
InnoDB: FTS optimize thread exiting.
InnoDB: Starting shutdown...
InnoDB: Shutdown completed; log sequence number 1123519528
221229 10:57:13 completed OK!
10.查看備份文件目錄
shell> ll -h /mysql/dbbackup/2022-12-29_10-11-07/sysbench/
total 271M
-rw-r----- 1 root root 67 Dec 29 10:11 db.opt
-rw-r----- 1 root root 8.5K Dec 29 10:11 sbtest10.frm
-rw-r--r-- 1 root root 578 Dec 29 10:57 sbtest10#P#p0.cfg
-rw-r----- 1 root root 16K Dec 29 10:57 sbtest10#P#p0.exp
-rw-r----- 1 root root 9.0M Dec 29 10:11 sbtest10#P#p0.ibd
-rw-r--r-- 1 root root 578 Dec 29 10:57 sbtest10#P#p1.cfg
-rw-r----- 1 root root 16K Dec 29 10:57 sbtest10#P#p1.exp
-rw-r----- 1 root root 9.0M Dec 29 10:11 sbtest10#P#p1.ibd
-rw-r--r-- 1 root root 578 Dec 29 10:57 sbtest10#P#p2.cfg
...
可以看到prepare備份文件后，多了 cfg,exp結(jié)尾的文件
11.傳輸備份文件
將準(zhǔn)備好的備份文件中后綴名為cfg，ibd，exp的文件傳輸?shù)組ySQL-B實(shí)例的sysbench庫下
shell> scp -r /mysql/dbbackup/2022-12-29_10-11-07/sysbench/*.ibd /mysql/dbbackup/2022-12-29_10-11-07/sysbench/*.cfg /mysql/dbbackup/2022-12-29_10-11-07/sysbench/*.exp root@192.168.100.11:/mysql/dbdata/data5508/data/sysbench/
12.修改傳輸過來的文件的屬主屬組
shell> chown -R mysql.mysql /mysql
13.登錄 MySQL-B 執(zhí)行導(dǎo)入表空間的 SQL 語句
mysql> source /tmp/import.sql;
14.登錄 MySQL-B 檢查一張表是否正常
mysql> select count(*) from sysbench.sbtest1;
+----------+
| count(*) |
+----------+
| 10000 |
+----------+
1 row in set (0.01 sec)
15.使用 sysbench 進(jìn)行壓測 MySQL-B
shell> sysbench src/lua/oltp_read_write.lua --mysql-db=sysbench --mysql-host=192.168.100.11 --mysql-port=5508 --mysql-user=greatsql --mysql-password='greatsql' --tables=10 --table_size=10000 --report-interval=2 --threads=50 --time=300 --mysql_storage_engine=innodb --partitions=3 --skip_trx=0 --mysql-ignore-errors=all run
sysbench 1.1.0-df89d34 (using bundled LuaJIT 2.1.0-beta3)
...
...
SQL statistics:
queries performed:
read: 1702400
write: 486400
other: 243200
total: 2432000
transactions: 121600 (405.25 per sec.)
queries: 2432000 (8105.04 per sec.)
ignored errors: 0 (0.00 per sec.)
reconnects: 0 (0.00 per sec.)
Throughput:
events/s (eps): 405.2522
time elapsed: 300.0601s
total number of events: 121600
Latency (ms):
min: 9.04
avg: 123.36
max: 1512.19
95th percentile: 590.56
sum: 15000942.35
Threads fairness:
events (avg/stddev): 2432.0000/58.48
execution time (avg/stddev): 300.0188/0.01
壓測正常
16.重啟MySQL-B并查詢一張表
mysql> shutdown;
shell> /mysql/svr/mysql/bin/mysqld_safe --defaults-file=/mysql/conf/my5508.cnf --user=mysql &
mysql> select count(*) from sysbench.sbtest2;
+----------+
| count(*) |
+----------+
| 10000 |
+----------+
1 row in set (0.04 sec)
總結(jié)
通過上述方法可以快速備份恢復(fù)大數(shù)據(jù)量的庫，也可以同時(shí)指定多個(gè)庫，單張表或多張表進(jìn)行恢復(fù)。可參考官方文檔 Partial Backups - Percona XtraBackup。
