Introduction to mysqlbinlog command (remote pull binlog)

from MySQL5.6 Start ,mysqlbinlog Support to transfer binlog Live copy to local server .

mysqlbinlog The real-time binary copy function of is not simply to copy the logs of the remote server , It's through MySQL 5.6 released Replication API Get binary events in real time . Essentially , Equivalent to MySQL From the server . Similar to a normal server , After the main server event , Usually in 0.5~1 Backup in seconds .

Here is the main introduction mysqlbinlog Remote pull log command and main parameters ：

 Order sample ：mysqlbinlog -v --base64-output=DECODE-ROWS --read-from-remote-server --raw --host=x.x.x.x --port=3306 --user=root --password=123456 --stop-never mysql-bin.000001

--read-from-remote-server： For backing up remote servers binlog. If you do not specify this option , The local binlog.

--raw：binlog Logs are stored on disk in binary format , If you do not specify this option , Will be saved as text , For text mode, you need to specify the file name , Otherwise, it is printed on the console .

--user： Copy of the MySQL user , Just grant REPLICATION SLAVE jurisdiction .

--stop-never：mysqlbinlog You can only get the specified number of... From the remote server binlog,
 Can also be generated by binlog Save to local . Specify this option , Represents as long as the remote server is not shut down or the connection is not disconnected ,
mysqlbinlog Will continue to copy the remote server binlog.

mysql-bin.000001： From which binlog Start copying , It's just a combination --stop-never You can copy files that do not appear on the command line in order （ such as mysql-bin.000002,mysql-bin.000003 etc. ）.

-v --base64-output=DECODE-ROWS  Command for binary log files sql command base64 The decoding 

--database  Specify database name 

 In addition to the above options , There are also several options to note ：

--stop-never-slave-server-id： On the backup remote server binlog when ,mysqlbinlog It's essentially a slave server ,
 This option is used to specify the slave server server-id Of . The default is -1.

--to-last-log： representative mysqlbinlog Not only can I get the specified binlog, You can also get what's generated later binlog,
 It's over , To terminate . If you specify --stop-never The options are implicitly turned on --to-last-log Options .

--result-file： To set up a remote server binlog, Save to local prefix ( without --row, Is the file name ). For example, for mysql-bin.000001,
 If specified --result-file=/test/backup-, The file name saved locally is /test/backup-mysql-bin.000001.
 Be careful ： If you will --result-file Set to directory , Must be accompanied by a directory separator “/”. for example --result-file=/test/,
 instead of --result-file=/test, Otherwise, the local file name is /testmysql-bin.000001

--raw I won't support it --database,--start-datetime,--end-datetime,--end-position

--stop-never When it appears , From the target file （mysql-bin.000001） Start continuous copying of subsequent files , Otherwise, only pull the target file 

Next, let's show the command

mysqlbinlog -v --base64-output=DECODE-ROWS  mysql-bin.000002

Example results after execution （ among mysql-bin.000002 For local files ）

/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=1*/;
/*!50003 SET @[email protected]@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
DELIMITER /*!*/;
# at 4
#220720 15:07:06 server id 1  end_log_pos 0 CRC32 0xfc718567    Start: binlog v 4, server v 5.7.30-log created 220720 15:07:06
# at 123
#220720 17:19:00 server id 1  end_log_pos 1071 CRC32 0xe3719127         Anonymous_GTID  last_committed=3        sequence_number=4       rbr_only=yes
/*!50718 SET TRANSACTION ISOLATION LEVEL READ COMMITTED*//*!*/;
SET @@SESSION.GTID_NEXT= 'ANONYMOUS'/*!*/;
# at 188
#220720 17:19:00 server id 1  end_log_pos 1151 CRC32 0x4fbd6189         Query   thread_id=47    exec_time=0     error_code=0
SET TIMESTAMP=1658308740/*!*/;
SET @@session.pseudo_thread_id=47/*!*/;
SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=0, @@session.unique_checks=1, @@session.autocommit=1/*!*/;
SET @@session.sql_mode=1436549120/*!*/;
SET @@session.auto_increment_increment=1, @@session.auto_increment_offset=1/*!*/;
/*!\C utf8mb4 *//*!*/;
SET @@session.character_set_client=45,@@session.collation_connection=45,@@session.collation_server=45/*!*/;
SET @@session.lc_time_names=0/*!*/;
SET @@session.collation_database=DEFAULT/*!*/;
BEGIN
/*!*/;
# at 268
#220720 17:19:00 server id 1  end_log_pos 1214 CRC32 0x58b5cbd4         Table_map: `mysql_shiyan`.`employee` mapped to number 110
# at 331
#220720 17:19:00 server id 1  end_log_pos 1259 CRC32 0xa71b0d0e         Write_rows: table id 110 flags: STMT_END_F
### INSERT INTO `mysql_shiyan`.`employee`
### SET
###   @1=5
###   @2='Dog7'
###   @3=NULL
# at 376
#220720 17:19:00 server id 1  end_log_pos 1290 CRC32 0x49c4796a         Xid = 305
COMMIT/*!*/;
# at 407
#220720 17:24:41 server id 1  end_log_pos 1355 CRC32 0x21f52f84         Anonymous_GTID  last_committed=4        sequence_number=5       rbr_only=yes
/*!50718 SET TRANSACTION ISOLATION LEVEL READ COMMITTED*//*!*/;
SET @@SESSION.GTID_NEXT= 'ANONYMOUS'/*!*/;
# at 472
#220720 17:24:41 server id 1  end_log_pos 1435 CRC32 0x4f39b2d6         Query   thread_id=47    exec_time=0     error_code=0
SET TIMESTAMP=1658309081/*!*/;
BEGIN
/*!*/;
# at 552
#220720 17:24:41 server id 1  end_log_pos 1498 CRC32 0x04b33e43         Table_map: `mysql_shiyan`.`employee` mapped to number 110
# at 615
#220720 17:24:41 server id 1  end_log_pos 1639 CRC32 0x86990db1         Update_rows: table id 110 flags: STMT_END_F
### UPDATE `mysql_shiyan`.`employee`
### WHERE
###   @1=5
###   @2='Dog5'
###   @3=NULL
### SET
###   @1=5
###   @2='Dog77'
###   @3=NULL
### UPDATE `mysql_shiyan`.`employee`
### WHERE
###   @1=5
###   @2='Dog5'
###   @3=NULL
### SET
###   @1=5
###   @2='Dog77'
###   @3=NULL
### UPDATE `mysql_shiyan`.`employee`
### WHERE
###   @1=5
###   @2='Dog5'
###   @3=NULL
### SET
###   @1=5
###   @2='Dog77'
###   @3=NULL
### UPDATE `mysql_shiyan`.`employee`
### WHERE
###   @1=5
###   @2='Dog6'
###   @3=NULL
### SET
###   @1=5
###   @2='Dog77'
###   @3=NULL
### UPDATE `mysql_shiyan`.`employee`
### WHERE
###   @1=5
###   @2='Dog7'
###   @3=NULL
### SET
###   @1=5
###   @2='Dog77'
###   @3=NULL
# at 756
#220720 17:24:41 server id 1  end_log_pos 1670 CRC32 0x0dce8341         Xid = 361
COMMIT/*!*/;
# at 787
#220720 17:26:09 server id 1  end_log_pos 1735 CRC32 0xe778776d         Anonymous_GTID  last_committed=5        sequence_number=6       rbr_only=yes
/*!50718 SET TRANSACTION ISOLATION LEVEL READ COMMITTED*//*!*/;
SET @@SESSION.GTID_NEXT= 'ANONYMOUS'/*!*/;
# at 852
#220720 17:26:09 server id 1  end_log_pos 1815 CRC32 0xb766cc4f         Query   thread_id=47    exec_time=0     error_code=0
SET TIMESTAMP=1658309169/*!*/;
BEGIN
/*!*/;
# at 932
#220720 17:26:09 server id 1  end_log_pos 1878 CRC32 0x83f37203         Table_map: `mysql_shiyan`.`employee` mapped to number 110
# at 995
#220720 17:26:09 server id 1  end_log_pos 1968 CRC32 0xb3d7455c         Delete_rows: table id 110 flags: STMT_END_F
### DELETE FROM `mysql_shiyan`.`employee`
### WHERE
###   @1=5
###   @2='Dog77'
###   @3=NULL
### DELETE FROM `mysql_shiyan`.`employee`
### WHERE
###   @1=5
###   @2='Dog77'
###   @3=NULL
### DELETE FROM `mysql_shiyan`.`employee`
### WHERE
###   @1=5
###   @2='Dog77'
###   @3=NULL
### DELETE FROM `mysql_shiyan`.`employee`
### WHERE
###   @1=5
###   @2='Dog77'
###   @3=NULL
### DELETE FROM `mysql_shiyan`.`employee`
### WHERE
###   @1=5
###   @2='Dog77'
###   @3=NULL
# at 1085
#220720 17:26:09 server id 1  end_log_pos 1999 CRC32 0xf3a5f5f8         Xid = 377
COMMIT/*!*/;
SET @@SESSION.GTID_NEXT= 'AUTOMATIC' /* added by mysqlbinlog */ /*!*/;
DELIMITER ;
# End of log file
/*!50003 SET [email protected]_COMPLETION_TYPE*/;
/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=0*/;

It can be seen from the above that no matter it is increasing , Delete and change operations ,binglog All data of relevant records are stored in , among @1,@2,@3 Is the field sequence number .

A final reminder , The party that pulls logs does not need to install mysql, Just need to have mysqlbinlog Executable files ( Already installed mysql Of bin Get... In the directory ) that will do .