MySQL binlog中的事件类型详解

数据库  /  管理员 发布于 6年前   192

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 tofix 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 longersql_ex, allowing multibyte TERMINATED BY etc; both types share thesame 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 aretherefore 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 timeto ensure master's online status to slave*/HEARTBEAT_LOG_EVENT= 27,/**In some situations, it is necessary to send over ignorabledata to the slave: data that a slave can handle in case thereis code for handling it, but which can be ignored if it is notrecognized.*/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=0SET 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=0SET 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 = 12COMMIT/*!*/;

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

以上所述是小编给大家介绍的MySQL binlog中的事件类型详解，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对站的支持！