1197多语句事务要求更大的max_binlog_cache_size报错
binlog_cache_size:为每个session 分配的内存，在事务过程中用来存储二进制日志的缓存,提高记录bin-log的效率。没有什么大事务，dml也不是很频繁的情况下可以设置小一点，如果事务大而且多，dml操作也频繁，则可以适当的调大一点。
max_binlog_cache_size设置的参考标准
Binlog_cache_disk_use表示因为我们binlog_cache_size设计的内存不足导致缓存二进制日志用到了临时文件的次数；Binlog_cache_use 表示用binlog_cache_size缓存的次数，当对应的Binlog_cache_disk_use 值比较大的时候 我们可以考虑适当的调高 binlog_cache_size 对应的值
【故障情景】
通过脚本以load的方式导入数据时，出现多行事务需要的max_binlog_cache_size空间不足。该数据文件HAOHUAN.txt只包含以逗号分隔的500万行左右的数据，每行四列，文件大小为270M。
[root@172-16-3-190 shells]# bash x load_data_into.sh 文件的总数为:1 文件名为:/tmp/load/HAOHUAN.txt 当前正在处理的文件是:/tmp/load/HAOHUAN.txt load data infile '/tmp/load/HAOHUAN.txt' into table practice.temp_baofoo_unbind fields terminated by ',' lines terminated by 'n' (merchant_no,bank_code,bank_card,protocol_no) Warning: Using a password on the command line interface can be insecure. ERROR 1197 (HY000) at line 1: Multi-statement transaction required more than 'max_binlog_cache_size' bytes of storage; increase this MySQLd variable and try again
【故障排查】
查看max_binlog_cache_size的大小，发现数据文件的大小确实较max_binlog_cache_size的值要小，如果max_binlog_cache_size的大小不足以存放事务的binlog，那么会临时使用磁盘临时文件来存放binlog，通过查看Binlog_cache_disk_use发现使用临时文件存放的次数为1。因此增大max_binlog_cache_size的值到300M，再次执行脚本发现还是报相同的错误。且使用临时文件的次数为2，使用临时文件的存放binlog的总次数也相应由15增加到了16次。
mysql> show global variables like '%binlog_cache%'; ----------------------- ----------- | Variable_name | Value | ----------------------- ----------- | binlog_cache_size | 16777216 | | max_binlog_cache_size | 268435456 | ----------------------- ----------- 2 rows in set (0.00 sec)
mysql> show global status like '%binlog_cache%'; ----------------------- ------- | Variable_name | Value | ----------------------- ------- | Binlog_cache_disk_use | 1 | | Binlog_cache_use | 15 | ----------------------- ------- 2 rows in set (0.00 sec)
mysql> set @@global.max_binlog_cache_size=300000000; Query OK, 0 rows affected, 1 warning (0.00 sec)
[root@172-16-3-190 shells]# bash x load_data_into.sh 文件的总数为:1 文件名为:/tmp/load/HAOHUAN.txt 当前正在处理的文件是:/tmp/load/HAOHUAN.txt load data infile '/tmp/load/HAOHUAN.txt' into table practice.temp_baofoo_unbind fields terminated by ',' lines terminated by 'n' (merchant_no,bank_code,bank_card,protocol_no) Warning: Using a password on the command line interface can be insecure. ERROR 1197 (HY000) at line 1: Multi-statement transaction required more than 'max_binlog_cache_size' bytes of storage; increase this mysqld variable and try again
mysql> show global status like '%binlog_cache%'; ----------------------- ------- | Variable_name | Value | ----------------------- ------- | Binlog_cache_disk_use | 2 | | Binlog_cache_use | 16 | ----------------------- ------- 2 rows in set (0.00 sec)
无奈直接增加max_binlog_cache_size的值到500M时问题才解决（后经test实际给到400M也可以load成功），但是slave上的值没有及时改动，因而SQL同步线程报错，stop同步线程，同master一样的更改后，同步才算正常
mysql> set @@global.max_binlog_cache_size=500000000; Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> show slave status G; *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 172.16.3.190 Master_User: repl Master_Port: 3309 Connect_Retry: 30 Master_Log_File: binlog.000018 Read_Master_Log_Pos: 120 Relay_Log_File: relay_bin.000006 Relay_Log_Pos: 6973 Relay_Master_Log_File: binlog.000017 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 1197 Last_Error: Could not execute Write_rows event on table practice.temp_baofoo_unbind; Multi-statement transaction required more than 'max_binlog_cache_size' bytes of storage; increase this mysqld variable and try again, Error_code: 1197; Writing one row to the row-based binary log failed, Error_code: 1534; handler error HA_ERR_RBR_LOGGING_FAILED; the event's master log binlog.000017, end_log_pos 268602107 Skip_Counter: 0 Exec_Master_Log_Pos: 11408 Relay_Log_Space: 333526981 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 208 Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 1197 Last_SQL_Error: Could not execute Write_rows event on table practice.temp_baofoo_unbind; Multi-statement transaction required more than 'max_binlog_cache_size' bytes of storage; increase this mysqld variable and try again, Error_code: 1197; Writing one row to the row-based binary log failed, Error_code: 1534; handler error HA_ERR_RBR_LOGGING_FAILED; the event's master log binlog.000017, end_log_pos 268602107 Replicate_Ignore_Server_Ids: Master_Server_Id: 1903309 Master_UUID: 1b589d80-f450-11e7-9150-525400f4ecb2 Master_Info_File: /opt/app/mysql_3309/logs/master.info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Reading event from the relay log Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: 180803 17:39:08 Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: Executed_Gtid_Set: Auto_Position: 0 1 row in set (0.00 sec)
mysql> stop slave; Query OK, 0 rows affected (1 min 10.64 sec)
【故障总结】
max_binlog_cache_size参数时动态参数，该值的设置可以参考binlog_cache_use的大小来相应增加。load导入或者delete数据的大小必须要大于max_binlog_cache_size的值，多行事务才能成功执行。该参数值修改后，注意要与配置文件中的值大小一致。
