MySQL binlog中的事件类型
2018-06-17 22:55:31来源：未知 阅读 ()
MySQL binlog记录的所有操作实际上都有对应的事件类型的，譬如STATEMENT格式中的DML操作对应的是QUERY_EVENT类型，ROW格式下的DML操作对应的是ROWS_EVENT类型。
首先，看看源码中定义的事件类型
源码位置：mysql-5.7.14/libbinlogevents/include/binlog_event.h
enum Log_event_type { /** Every time you update this enum (when you add a type), you have to fix Format_description_event::Format_description_event(). */ UNKNOWN_EVENT= 0, START_EVENT_V3= 1, QUERY_EVENT= 2, STOP_EVENT= 3, ROTATE_EVENT= 4, INTVAR_EVENT= 5, LOAD_EVENT= 6, SLAVE_EVENT= 7, CREATE_FILE_EVENT= 8, APPEND_BLOCK_EVENT= 9, EXEC_LOAD_EVENT= 10, DELETE_FILE_EVENT= 11, /** NEW_LOAD_EVENT is like LOAD_EVENT except that it has a longer sql_ex, allowing multibyte TERMINATED BY etc; both types share the same class (Load_event) */ NEW_LOAD_EVENT= 12, RAND_EVENT= 13, USER_VAR_EVENT= 14, FORMAT_DESCRIPTION_EVENT= 15, XID_EVENT= 16, BEGIN_LOAD_QUERY_EVENT= 17, EXECUTE_LOAD_QUERY_EVENT= 18, TABLE_MAP_EVENT = 19, /** The PRE_GA event numbers were used for 5.1.0 to 5.1.15 and are therefore obsolete. */ PRE_GA_WRITE_ROWS_EVENT = 20, PRE_GA_UPDATE_ROWS_EVENT = 21, PRE_GA_DELETE_ROWS_EVENT = 22, /** The V1 event numbers are used from 5.1.16 until mysql-trunk-xx */ WRITE_ROWS_EVENT_V1 = 23, UPDATE_ROWS_EVENT_V1 = 24, DELETE_ROWS_EVENT_V1 = 25, /** Something out of the ordinary happened on the master */ INCIDENT_EVENT= 26, /** Heartbeat event to be send by master at its idle time to ensure master's online status to slave */ HEARTBEAT_LOG_EVENT= 27, /** In some situations, it is necessary to send over ignorable data to the slave: data that a slave can handle in case there is code for handling it, but which can be ignored if it is not recognized. */ IGNORABLE_LOG_EVENT= 28, ROWS_QUERY_LOG_EVENT= 29, /** Version 2 of the Row events */ WRITE_ROWS_EVENT = 30, UPDATE_ROWS_EVENT = 31, DELETE_ROWS_EVENT = 32, GTID_LOG_EVENT= 33, ANONYMOUS_GTID_LOG_EVENT= 34, PREVIOUS_GTIDS_LOG_EVENT= 35, TRANSACTION_CONTEXT_EVENT= 36, VIEW_CHANGE_EVENT= 37, /* Prepared XA transaction terminal event similar to Xid */ XA_PREPARE_LOG_EVENT= 38, /** Add new events here - right above this comment! Existing events (except ENUM_END_EVENT) should never change their numbers */ ENUM_END_EVENT /* end marker */ };
实际上还是蛮多的，下面就挑几个重点的说一下
QUERY_EVENT
QUERY_EVENT以文本的形式来记录事务的操作。
QUERY_EVENT类型的事件通常在以下几种情况下使用：
1. 事务开始时，执行的BEGIN操作。
2. STATEMENT格式中的DML操作
3. ROW格式中的DDL操作
譬如：
mysql> show binlog events in 'mysql-bin.000021'; +------------------+-----+-------------+-----------+-------------+-----------------------------------------------+ | Log_name | Pos | Event_type | Server_id | End_log_pos | Info | +------------------+-----+-------------+-----------+-------------+-----------------------------------------------+ | mysql-bin.000021 | 4 | Format_desc | 1 | 120 | Server ver: 5.6.31-log, Binlog ver: 4 | | mysql-bin.000021 | 120 | Query | 1 | 195 | BEGIN | | mysql-bin.000021 | 195 | Query | 1 | 298 | insert into test.t1 values(1,'a') | | mysql-bin.000021 | 298 | Xid | 1 | 329 | COMMIT /* xid=25 */ | | mysql-bin.000021 | 329 | Query | 1 | 408 | BEGIN | | mysql-bin.000021 | 408 | Query | 1 | 515 | use `test`; insert into test.t1 values(2,'b') | | mysql-bin.000021 | 515 | Xid | 1 | 546 | COMMIT /* xid=33 */ | +------------------+-----+-------------+-----------+-------------+-----------------------------------------------+
FORMAT_DESCRIPTION_EVENT
FORMAT_DESCRIPTION_EVENT是binlog version 4中为了取代之前版本中的START_EVENT_V3事件而引入的。它是binlog文件中的第一个事件，而且，该事件只会在binlog中出现一次。MySQL根据FORMAT_DESCRIPTION_EVENT的定义来解析其它事件。
它通常指定了MySQL Server的版本，binlog的版本，该binlog文件的创建时间。
譬如：
# at 4 #160817 11:00:10 server id 1 end_log_pos 120 CRC32 0x03010da1 Start: binlog v 4, server v 5.6.31-log created 160817 11:00:10 # Warning: this binlog is either in use or was not closed properly.
mysql> show binlog events in 'mysql-bin.000021'; +------------------+-----+-------------+-----------+-------------+-----------------------------------------------+ | Log_name | Pos | Event_type | Server_id | End_log_pos | Info | +------------------+-----+-------------+-----------+-------------+-----------------------------------------------+ | mysql-bin.000021 | 4 | Format_desc | 1 | 120 | Server ver: 5.6.31-log, Binlog ver: 4 | ...
ROWS_EVENT
对于ROW格式的binlog，所有的DML语句都是记录在ROWS_EVENT中。
ROWS_EVENT分为三种：WRITE_ROWS_EVENT，UPDATE_ROWS_EVENT，DELETE_ROWS_EVENT，分别对应insert，update和delete操作。
对于insert操作，WRITE_ROWS_EVENT包含了要插入的数据
对于update操作，UPDATE_ROWS_EVENT不仅包含了修改后的数据，还包含了修改前的值。
对于delete操作，仅仅需要指定删除的主键（在没有主键的情况下，会给定所有列）
对于QUERY_EVENT事件，是以文本形式记录DML操作的。而对于ROWS_EVENT事件，并不是文本形式，所以在通过mysqlbinlog查看基于ROW格式的binlog时，需要指定-vv --base64-output=decode-rows。
譬如：
mysql> show binlog events in 'mysql-bin.000027'; +------------------+-----+-------------+-----------+-------------+---------------------------------------+ | Log_name | Pos | Event_type | Server_id | End_log_pos | Info | +------------------+-----+-------------+-----------+-------------+---------------------------------------+ | mysql-bin.000027 | 4 | Format_desc | 1 | 120 | Server ver: 5.6.31-log, Binlog ver: 4 | | mysql-bin.000027 | 120 | Query | 1 | 188 | BEGIN | | mysql-bin.000027 | 188 | Table_map | 1 | 236 | table_id: 80 (test.t1) | | mysql-bin.000027 | 236 | Write_rows | 1 | 278 | table_id: 80 flags: STMT_END_F | | mysql-bin.000027 | 278 | Xid | 1 | 309 | COMMIT /* xid=198 */ | | mysql-bin.000027 | 309 | Query | 1 | 377 | BEGIN | | mysql-bin.000027 | 377 | Table_map | 1 | 425 | table_id: 80 (test.t1) | | mysql-bin.000027 | 425 | Update_rows | 1 | 475 | table_id: 80 flags: STMT_END_F | | mysql-bin.000027 | 475 | Xid | 1 | 506 | COMMIT /* xid=199 */ | | mysql-bin.000027 | 506 | Query | 1 | 574 | BEGIN | | mysql-bin.000027 | 574 | Table_map | 1 | 622 | table_id: 80 (test.t1) | | mysql-bin.000027 | 622 | Delete_rows | 1 | 664 | table_id: 80 flags: STMT_END_F | | mysql-bin.000027 | 664 | Xid | 1 | 695 | COMMIT /* xid=200 */ | +------------------+-----+-------------+-----------+-------------+---------------------------------------+ 13 rows in set (0.00 sec)
XID_EVENT
在事务提交时，不管是STATEMENT还是ROW格式的binlog，都会在末尾添加一个XID_EVENT事件代表事务的结束。该事件记录了该事务的ID，在MySQL进行崩溃恢复时，根据事务在binlog中的提交情况来决定是否提交存储引擎中状态为prepared的事务。
ROTATE_EVENT
当binlog文件的大小达到max_binlog_size的值或者执行flush logs命令时，binlog会发生切换，这个时候会在当前的binlog日志添加一个ROTATE_EVENT事件，用于指定下一个日志的名称和位置。
mysql> show binlog events in 'mysql-bin.000028'; +------------------+-----+-------------+-----------+-------------+---------------------------------------+ | Log_name | Pos | Event_type | Server_id | End_log_pos | Info | +------------------+-----+-------------+-----------+-------------+---------------------------------------+ | mysql-bin.000028 | 4 | Format_desc | 1 | 120 | Server ver: 5.6.31-log, Binlog ver: 4 | | mysql-bin.000028 | 120 | Rotate | 1 | 167 | mysql-bin.000029;pos=4 | +------------------+-----+-------------+-----------+-------------+---------------------------------------+ 2 rows in set (0.00 sec)
# at 120 #160817 12:34:26 server id 1 end_log_pos 167 CRC32 0xd965567c Rotate to mysql-bin.000029 pos: 4
GTID_LOG_EVENT
在启用GTID模式后，MySQL实际上为每个事务都分配了个GTID
譬如：
# at 448 #160818 5:37:32 server id 1 end_log_pos 496 CRC32 0xaeb24aac GTID [commit=yes] SET @@SESSION.GTID_NEXT= 'cad449f2-5d4f-11e6-b353-000c29c64704:3'/*!*/;
# at 496 #160818 5:37:32 server id 1 end_log_pos 571 CRC32 0x042ca092 Query thread_id=2 exec_time=0 error_code=0 SET TIMESTAMP=1471469852/*!*/; BEGIN /*!*/;
# at 571 #160818 5:37:32 server id 1 end_log_pos 674 CRC32 0xa35beb37 Query thread_id=2 exec_time=0 error_code=0 SET TIMESTAMP=1471469852/*!*/; insert into test.t1 values(2,'b') /*!*/;
# at 674 #160818 5:37:32 server id 1 end_log_pos 705 CRC32 0x1905d8c6 Xid = 12 COMMIT/*!*/;
mysql> show binlog events in 'mysql-bin.000033'; +------------------+-----+----------------+-----------+-------------+-------------------------------------------------------------------+ | Log_name | Pos | Event_type | Server_id | End_log_pos | Info | +------------------+-----+----------------+-----------+-------------+-------------------------------------------------------------------+ | mysql-bin.000033 | 4 | Format_desc | 1 | 120 | Server ver: 5.6.31-log, Binlog ver: 4 | | mysql-bin.000033 | 120 | Previous_gtids | 1 | 191 | cad449f2-5d4f-11e6-b353-000c29c64704:1 | | mysql-bin.000033 | 191 | Gtid | 1 | 239 | SET @@SESSION.GTID_NEXT= 'cad449f2-5d4f-11e6-b353-000c29c64704:2' | | mysql-bin.000033 | 239 | Query | 1 | 314 | BEGIN | | mysql-bin.000033 | 314 | Query | 1 | 417 | insert into test.t1 values(1,'a') | | mysql-bin.000033 | 417 | Xid | 1 | 448 | COMMIT /* xid=11 */ | | mysql-bin.000033 | 448 | Gtid | 1 | 496 | SET @@SESSION.GTID_NEXT= 'cad449f2-5d4f-11e6-b353-000c29c64704:3' | | mysql-bin.000033 | 496 | Query | 1 | 571 | BEGIN | | mysql-bin.000033 | 571 | Query | 1 | 674 | insert into test.t1 values(2,'b') | | mysql-bin.000033 | 674 | Xid | 1 | 705 | COMMIT /* xid=12 */ | | mysql-bin.000033 | 705 | Rotate | 1 | 752 | mysql-bin.000034;pos=4 | +------------------+-----+----------------+-----------+-------------+-------------------------------------------------------------------+ 11 rows in set (0.00 sec)
PREVIOUS_GTIDS_LOG_EVENT
开启GTID模式后，每个binlog开头都会有一个PREVIOUS_GTIDS_LOG_EVENT事件，它的值是上一个binlog的PREVIOUS_GTIDS_LOG_EVENT+GTID_LOG_EVENT，实际上，在数据库重启的时候，需要重新填充gtid_executed的值，该值即是最新一个binlog的PREVIOUS_GTIDS_LOG_EVENT+GTID_LOG_EVENT。
譬如：
mysql> show binlog events in 'mysql-bin.000033'; +------------------+-----+----------------+-----------+-------------+-------------------------------------------------------------------+ | Log_name | Pos | Event_type | Server_id | End_log_pos | Info | +------------------+-----+----------------+-----------+-------------+-------------------------------------------------------------------+ | mysql-bin.000033 | 4 | Format_desc | 1 | 120 | Server ver: 5.6.31-log, Binlog ver: 4 | | mysql-bin.000033 | 120 | Previous_gtids | 1 | 191 | cad449f2-5d4f-11e6-b353-000c29c64704:1 | | mysql-bin.000033 | 191 | Gtid | 1 | 239 | SET @@SESSION.GTID_NEXT= 'cad449f2-5d4f-11e6-b353-000c29c64704:2' | | mysql-bin.000033 | 239 | Query | 1 | 314 | BEGIN | | mysql-bin.000033 | 314 | Query | 1 | 417 | insert into test.t1 values(1,'a') | | mysql-bin.000033 | 417 | Xid | 1 | 448 | COMMIT /* xid=11 */ | | mysql-bin.000033 | 448 | Gtid | 1 | 496 | SET @@SESSION.GTID_NEXT= 'cad449f2-5d4f-11e6-b353-000c29c64704:3' | | mysql-bin.000033 | 496 | Query | 1 | 571 | BEGIN | | mysql-bin.000033 | 571 | Query | 1 | 674 | insert into test.t1 values(2,'b') | | mysql-bin.000033 | 674 | Xid | 1 | 705 | COMMIT /* xid=12 */ | | mysql-bin.000033 | 705 | Rotate | 1 | 752 | mysql-bin.000034;pos=4 | +------------------+-----+----------------+-----------+-------------+-------------------------------------------------------------------+ 11 rows in set (0.00 sec) mysql> show binlog events in 'mysql-bin.000034'; +------------------+-----+----------------+-----------+-------------+------------------------------------------+ | Log_name | Pos | Event_type | Server_id | End_log_pos | Info | +------------------+-----+----------------+-----------+-------------+------------------------------------------+ | mysql-bin.000034 | 4 | Format_desc | 1 | 120 | Server ver: 5.6.31-log, Binlog ver: 4 | | mysql-bin.000034 | 120 | Previous_gtids | 1 | 191 | cad449f2-5d4f-11e6-b353-000c29c64704:1-3 | +------------------+-----+----------------+-----------+-------------+------------------------------------------+ 2 rows in set (0.00 sec)
mysql-bin.000033日志中的Previous_gtids是cad449f2-5d4f-11e6-b353-000c29c64704:1，GTID是cad449f2-5d4f-11e6-b353-000c29c64704:2和cad449f2-5d4f-11e6-b353-000c29c64704:3，这样，在下一个日志，即mysql-bin.000034中的Previous_gtids是cad449f2-5d4f-11e6-b353-000c29c64704:1-3。
# at 120 #160818 5:39:38 server id 1 end_log_pos 191 CRC32 0x4e84f3b5 Previous-GTIDs # cad449f2-5d4f-11e6-b353-000c29c64704:1-3
STOP_EVENT
当MySQL数据库停止时，会在当前的binlog末尾添加一个STOP_EVENT事件表示数据库停止。
譬如：
mysql> show binlog events in 'mysql-bin.000030'; +------------------+-----+-------------+-----------+-------------+---------------------------------------+ | Log_name | Pos | Event_type | Server_id | End_log_pos | Info | +------------------+-----+-------------+-----------+-------------+---------------------------------------+ | mysql-bin.000030 | 4 | Format_desc | 1 | 120 | Server ver: 5.6.31-log, Binlog ver: 4 | | mysql-bin.000030 | 120 | Stop | 1 | 143 | | +------------------+-----+-------------+-----------+-------------+---------------------------------------+ 2 rows in set (0.04 sec)
# at 120 #160818 5:18:04 server id 1 end_log_pos 143 CRC32 0xf20ddc85 Stop
参考
1. MariaDB原理与实现
2. MySQL官方文档
标签：
版权申明：本站文章部分自网络，如有侵权，请联系：west999com@outlook.com
特别注意：本站所有转载文章言论不代表本站观点，本站所提供的摄影照片，插画，设计作品，如需使用，请与原作者联系，版权归原作者所有
上一篇：浅析MySQL二进制日志
- MySQL replace函数怎么替换字符串语句 2020-03-09
- PHP访问MySQL查询超时怎么办 2020-03-09
- mysql登录时闪退 2020-02-27
- MySQL出现1067错误号 2020-02-27
- mysql7.x如何单独安装mysql 2020-02-27
IDC资讯： 主机资讯 注册资讯 托管资讯 vps资讯 网站建设
网站运营： 建站经验 策划盈利 搜索优化 网站推广 免费资源
网络编程： Asp.Net编程 Asp编程 Php编程 Xml编程 Access Mssql Mysql 其它
服务器技术： Web服务器 Ftp服务器 Mail服务器 Dns服务器 安全防护
软件技巧： 其它软件 Word Excel Powerpoint Ghost Vista QQ空间 QQ FlashGet 迅雷
网页制作： FrontPages Dreamweaver Javascript css photoshop fireworks Flash
