Mysql应用MySQL binlog中的事件类型详解
发布时间：2020-12-12 01:18:14 所属栏目：MySql教程 来源：网络整理
导读：《Mysql应用MySQL binlog中的事件类型详解》要点： 本文介绍了Mysql应用MySQL binlog中的事件类型详解，希望对您有用。如果有疑问，可以联系我们。 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
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《Mysql应用MySQL binlog中的事件类型详解》要点： 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数据库 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,'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编程之家PHP网站的支持!MYSQL数据库 （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |