binlog_format不同模式下，对mysqlbinlog恢复的影响

 

binlog_format='mixed'

(root@g1-db-test-v01:3306)[(none)]>use test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
(root@g1-db-test-v01:3306)[test]>update db1.t2 set name='haha' where id=105;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

(root@g1-db-test-v01:3306)[test]>use db1;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
(root@g1-db-test-v01:3306)[db1]>delete from test.t1 where id=11;
Query OK, 1 row affected (0.02 sec)

 

假如使用mysqlbinlog恢复db1的数据，命令加上参加 -d :

mysqlbinlog -d db1 test-mysql-bin.000115 > 115d.sql

 

/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=1*/;
/*!40019 SET @@session.max_insert_delayed_threads=0*/;
/*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
DELIMITER /*!*/;
# at 4
#170809 15:38:35 server id 1882073306  end_log_pos 120 CRC32 0x9c11ffa3         Start: binlog v 4, server v 5.6.23-72.1-log created 170809 15:38:35
# Warning: this binlog is either in use or was not closed properly.
BINLOG '
+7uKWQ/aKC5wdAAAAHgAAAABAAQANS42LjIzLTcyLjEtbG9nAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAEzgNAAgAEgAEBAQEEgAAXAAEGggAAAAICAgCAAAACgoKGRkAAaP/
EZw=
'/*!*/;
# at 120
#170809 15:39:20 server id 1882073306  end_log_pos 198 CRC32 0x58ea2e3a         Query   thread_id=75    exec_time=0     error_code=0
SET TIMESTAMP=1502264360/*!*/;
SET @@session.pseudo_thread_id=75/*!*/;
SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=0, @@session.unique_checks=1, @@session.autocommit=1/*!*/;
SET @@session.sql_mode=1073741824/*!*/;
SET @@session.auto_increment_increment=1, @@session.auto_increment_offset=1/*!*/;
/*!\C utf8 *//*!*/;
SET @@session.character_set_client=33,@@session.collation_connection=33,@@session.collation_server=33/*!*/;
SET @@session.lc_time_names=0/*!*/;
SET @@session.collation_database=DEFAULT/*!*/;
BEGIN
/*!*/;
# at 198
# at 313
#170809 15:39:20 server id 1882073306  end_log_pos 344 CRC32 0xb2671190         Xid = 32389
COMMIT/*!*/;
# at 344
#170809 15:41:05 server id 1882073306  end_log_pos 422 CRC32 0x4befc6fe         Query   thread_id=75    exec_time=0     error_code=0
SET TIMESTAMP=1502264465/*!*/;
BEGIN
/*!*/;
# at 422
#170809 15:41:05 server id 1882073306  end_log_pos 526 CRC32 0x2b0ef4d4         Query   thread_id=75    exec_time=0     error_code=0
use `db1`/*!*/;
SET TIMESTAMP=1502264465/*!*/;
delete from test.t1 where id=11
/*!*/;
# at 526
#170809 15:41:05 server id 1882073306  end_log_pos 557 CRC32 0xb34d26a0         Xid = 32473
COMMIT/*!*/;
DELIMITER ;
# End of log file
ROLLBACK /* added by mysqlbinlog */;
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=0*/;
(END) 

上面的binlog只记录了 delete from test.t1 where id=11

 

描述这样一种场景，上述案例本想恢复update那一条数据，结果只能恢复delete那一条。

而delete的却是test库的表，如果在测试环境进行恢复，因只需恢复db1，没有创建test库，则恢复时会报错，恢复终止。

 

也就是说，在binlog_format='statement/mix'时，如果mysqlbinlog 不加 --database(-d)参数，解析的binlog里记录所有变更sql。但如果增加了 --database db1,则只记录use db1后面的变更sql

 

这样有一个问题，如果db1里的一张表 t1被删除了，我们想恢复。按照一般方法，是先使用最近备份恢复db1所有数据（因为按库备份)，然后使用mysqlbinlog恢复db1的数据到drop t1前一刻，此时使用mysqlbinlog 如果加了 --databae=db1，那在有跨库操作的情况下，会遗漏部分sql；而如果不加 --database=db1，那就更没法恢复了，因为之前只使用了db1的备份先恢复的，也就是只恢复了db1。综上，不加--database的话，就要将所库都先恢复一遍，然后使用mysqlbinlog不加参数继续恢复。

 

当设置row模式时，则不存在这种问题。

binlog_format='row'

(root@g1-db-test-v01:3306)[(none)]>use test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
(root@g1-db-test-v01:3306)[test]>update db1.t2 set name='hehe' where id=105;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

(root@g1-db-test-v01:3306)[test]>use db1;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
(root@g1-db-test-v01:3306)[db1]>delete from test.t1 where id=10;
Query OK, 1 row affected (0.02 sec)

 

mysqlbinlog --base64-output=decode-rows -vv -d db1 test-mysql-bin.000116 > 116d.sql

 

/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=1*/;
/*!40019 SET @@session.max_insert_delayed_threads=0*/;
/*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
DELIMITER /*!*/;
# at 4
#170809 16:28:12 server id 1882073306  end_log_pos 120 CRC32 0x6c11777a         Start: binlog v 4, server v 5.6.23-72.1-log created 170809 16:28:12
# Warning: this binlog is either in use or was not closed properly.
# at 120
#170809 16:28:51 server id 1882073306  end_log_pos 192 CRC32 0x256a9f3c         Query   thread_id=78    exec_time=0     error_code=0
SET TIMESTAMP=1502267331/*!*/;
SET @@session.pseudo_thread_id=78/*!*/;
SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=0, @@session.unique_checks=1, @@session.autocommit=1/*!*/;
SET @@session.sql_mode=1073741824/*!*/;
SET @@session.auto_increment_increment=1, @@session.auto_increment_offset=1/*!*/;
/*!\C utf8 *//*!*/;
SET @@session.character_set_client=33,@@session.collation_connection=33,@@session.collation_server=33/*!*/;
SET @@session.lc_time_names=0/*!*/;
SET @@session.collation_database=DEFAULT/*!*/;
BEGIN
/*!*/;
# at 192
#170809 16:28:51 server id 1882073306  end_log_pos 246 CRC32 0x285d8d5d         Table_map: `db1`.`t2` mapped to number 395
# at 246
#170809 16:28:51 server id 1882073306  end_log_pos 366 CRC32 0xb84daa2e         Update_rows: table id 395 flags: STMT_END_F
### UPDATE `db1`.`t2`
### WHERE
###   @1=105 /* INT meta=0 nullable=0 is_null=0 */
###   @2='haha' /* VARSTRING(90) meta=90 nullable=0 is_null=0 */
###   @3='57747ab889255af96b48d65e505382' /* VARSTRING(90) meta=90 nullable=0 is_null=0 */
###   @4='' /* VARSTRING(72) meta=72 nullable=0 is_null=0 */
###   @5=NULL /* VARSTRING(72) meta=0 nullable=1 is_null=1 */
### SET
###   @1=105 /* INT meta=0 nullable=0 is_null=0 */
###   @2='hehe' /* VARSTRING(90) meta=90 nullable=0 is_null=0 */
###   @3='57747ab889255af96b48d65e505382' /* VARSTRING(90) meta=90 nullable=0 is_null=0 */
###   @4='' /* VARSTRING(72) meta=72 nullable=0 is_null=0 */
###   @5=NULL /* VARSTRING(72) meta=0 nullable=1 is_null=1 */
# at 366
#170809 16:28:51 server id 1882073306  end_log_pos 397 CRC32 0x74a5b1df         Xid = 32558
COMMIT/*!*/;
# at 397
#170809 16:29:07 server id 1882073306  end_log_pos 468 CRC32 0x66079b66         Query   thread_id=78    exec_time=0     error_code=0
SET TIMESTAMP=1502267347/*!*/;
BEGIN
/*!*/;
# at 468
# at 519
# at 567
#170809 16:29:07 server id 1882073306  end_log_pos 598 CRC32 0xb3ffd246         Xid = 32583
COMMIT/*!*/;
DELIMITER ;
# End of log file
ROLLBACK /* added by mysqlbinlog */;
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=0*/;
(END)
 

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