mysql的二进制日志是怎样保存的

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说明

1、statement基于SQL语句，每个涉及修改的sql都会记录在binlog中。

缺点：日志量过大，如sleep()函数、last_insert_id()>、user-definedfuctions(udf)、主从复制等。

2、ROW基于行，只记录变化的记录，不记录sql的上下文环境。

缺点：如果遇到update..set..wheretrue，binlog的数据量会增加。

3、建议使用MIXED，语句采用statement。

函数采用ROW存储。

实例

# lee @ acer in /var/log/mysql [14:45:44]$ mysqlbinlog -vv mysql-bin.000076/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=1*/;/*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;DELIMITER /*!*/;# at 4#170713 14:35:53 server id 1  end_log_pos 123 CRC32 0xbf52e415  Start: binlog v 4, server v 5.7.18-0ubuntu0.16.04.1-log created 170713 14:35:53# Warning: this binlog is either in use or was not closed properly.BINLOG 'yRRnWQ8BAAAAdwAAAHsAAAABAAQANS43LjE4LTB1YnVudHUwLjE2LjA0LjEtbG9nAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAEzgNAAgAEgAEBAQEEgAAXwAEGggAAAAICAgCAAAACgoKKioAEjQAARXkUr8='/*!*/;# at 123#170713 14:35:53 server id 1  end_log_pos 154 CRC32 0xafecf53d  Previous-GTIDs# [empty]# at 154#170713 14:43:03 server id 1  end_log_pos 219 CRC32 0x491b5a7e  Anonymous_GTID  last_committed=0    sequence_number=1SET @@SESSION.GTID_NEXT= 'ANONYMOUS'/*!*/;# at 219#170713 14:43:03 server id 1  end_log_pos 318 CRC32 0x4acf1cd1  Query   thread_id=8 exec_time=0 error_code=0use `test`/*!*/;SET TIMESTAMP=1499928183/*!*/;SET @@session.pseudo_thread_id=8/*!*/;SET @@session.foreign_key_checks=1, @@session.sql_auto_is_null=0, @@session.unique_checks=1, @@session.autocommit=1/*!*/;SET @@session.sql_mode=1436549152/*!*/;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/*!*/;alter table t add c2 text/*!*/;# at 318#170713 14:44:02 server id 1  end_log_pos 383 CRC32 0x8437eaf9  Anonymous_GTID  last_committed=1    sequence_number=2SET @@SESSION.GTID_NEXT= 'ANONYMOUS'/*!*/;# at 383#170713 14:44:02 server id 1  end_log_pos 455 CRC32 0x57adaf15  Query   thread_id=8 exec_time=0 error_code=0SET TIMESTAMP=1499928242/*!*/;BEGIN/*!*/;# at 455#170713 14:44:02 server id 1  end_log_pos 504 CRC32 0xdba65133  Table_map: `test`.`t` mapped to number 498# at 504#170713 14:44:02 server id 1  end_log_pos 556 CRC32 0x19769a28  Write_rows: table id 498 flags: STMT_END_F BINLOG 'shZnWRMBAAAAMQAAAPgBAAAAAPIBAAAAAAEABHRlc3QAAXQAAwMP/AMeAAIHM1Gm2w==shZnWR4BAAAANAAAACwCAAAAAPIBAAAAAAEAAgAD//gDAAAABGhhaGEFAGxsYWxhKJp2GQ=='/*!*/;### INSERT INTO `test`.`t`### SET###   @1=3 /* INT meta=0 nullable=1 is_null=0 */###   @2='haha' /* VARSTRING(30) meta=30 nullable=1 is_null=0 */###   @3='llala' /* BLOB/TEXT meta=2 nullable=1 is_null=0 */# at 556#170713 14:44:02 server id 1  end_log_pos 587 CRC32 0x6184a9a1  Xid = 47COMMIT/*!*/;# at 587#170713 14:44:16 server id 1  end_log_pos 652 CRC32 0xc585d273  Anonymous_GTID  last_committed=2    sequence_number=3SET @@SESSION.GTID_NEXT= 'ANONYMOUS'/*!*/;# at 652#170713 14:44:16 server id 1  end_log_pos 724 CRC32 0x63005380  Query   thread_id=8 exec_time=0 error_code=0SET TIMESTAMP=1499928256/*!*/;BEGIN/*!*/;# at 724#170713 14:44:16 server id 1  end_log_pos 773 CRC32 0x2c52eaa1  Table_map: `test`.`t` mapped to number 498# at 773#170713 14:44:16 server id 1  end_log_pos 816 CRC32 0xa80bd454  Delete_rows: table id 498 flags: STMT_END_F BINLOG 'wBZnWRMBAAAAMQAAAAUDAAAAAPIBAAAAAAEABHRlc3QAAXQAAwMP/AMeAAIHoepSLA==wBZnWSABAAAAKwAAADADAAAAAPIBAAAAAAEAAgAD//wBAAAAAmRkVNQLqA=='/*!*/;### DELETE FROM `test`.`t`### WHERE###   @1=1 /* INT meta=0 nullable=1 is_null=0 */###   @2='dd' /* VARSTRING(30) meta=30 nullable=1 is_null=0 */###   @3=NULL /* BLOB/TEXT meta=2 nullable=1 is_null=1 */# at 816#170713 14:44:16 server id 1  end_log_pos 847 CRC32 0x9d03bcd0  Xid = 48COMMIT/*!*/;SET @@SESSION.GTID_NEXT= 'AUTOMATIC' /* added by mysqlbinlog */ /*!*/;DELIMITER ;# End of log file/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=0*/;

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