标签：ade 最大化 重要 com relay_log ica parallel 多个 erp
mysql> show global variables like ‘%group_commit%‘; +-----------------------------------------+-------+ | Variable_name | Value | +-----------------------------------------+-------+ | binlog_group_commit_sync_delay | 0 | | binlog_group_commit_sync_no_delay_count | 0 | +-----------------------------------------+-------+ 2 rows in set (0.00 sec)
[root@mxqmongodb2 log]# mysqlbinlog mysql-bin.000005 |grep last_committed #170607 11:24:57 server id 353306 end_log_pos 876350 CRC32 0x92093332 GTID last_committed=654 sequence_number=655 #170607 11:24:58 server id 353306 end_log_pos 880406 CRC32 0x344fdf71 GTID last_committed=655 sequence_number=656 #170607 11:24:58 server id 353306 end_log_pos 888700 CRC32 0x4ba2b05b GTID last_committed=656 sequence_number=657 #170607 11:24:58 server id 353306 end_log_pos 890675 CRC32 0xf8a8ad64 GTID last_committed=657 sequence_number=658 #170607 11:24:58 server id 353306 end_log_pos 892770 CRC32 0x127f9cdd GTID last_committed=658 sequence_number=659 #170607 11:24:58 server id 353306 end_log_pos 894757 CRC32 0x518abd93 GTID last_committed=659 sequence_number=660 #170607 11:37:46 server id 353306 end_log_pos 895620 CRC32 0x99174f95 GTID last_committed=660 sequence_number=661 #170607 11:37:51 server id 353306 end_log_pos 895897 CRC32 0xb4ffc341 GTID last_committed=661 sequence_number=662 #170607 11:38:00 server id 353306 end_log_pos 896174 CRC32 0x6bcbc492 GTID last_committed=662 sequence_number=663 #170607 11:39:40 server id 353306 end_log_pos 896365 CRC32 0x1fe16c7c GTID last_committed=663 sequence_number=664
[root@mxqmongodb2 log]# mysqlbinlog mysql-bin.000008|grep last_commit #170609 10:11:07 server id 353306 end_log_pos 75629 CRC32 0xd54f2604 GTID last_committed=269 sequence_number=270 #170609 10:13:03 server id 353306 end_log_pos 75912 CRC32 0x43675b14 GTID last_committed=270 sequence_number=271 #170609 10:13:24 server id 353306 end_log_pos 76195 CRC32 0x4f843438 GTID last_committed=270 sequence_number=272
#MTS slave-parallel-type=LOGICAL_CLOCK slave-parallel-workers=8 #太多的线程会增加线程间同步的开销，建议4-8个slave线程 master_info_repository=TABLE relay_log_info_repository=TABLE relay_log_recovery=ON slave-parallel-type有两个之，DATABASE和LOGICAL_CLOCK，DATABASE： 默认值，兼容5.6以schema维度的并行复制， LOGICAL_CLOCK： MySQL 5.7基于组提交的并行复制机制。
综合来说，MySQL5.7的并行复制是基于主库的group commit和从库以下参数的配置：mysql> show variables like ‘%slave_para%‘;
+------------------------+---------------+ | Variable_name | Value | +------------------------+---------------+ | slave_parallel_type | LOGICAL_CLOCK | | slave_parallel_workers | 8 | +------------------------+---------------+ 2 rows in set (0.01 sec)
要想使用MySQL5.7的并行复制，必须首先主库设置binlog_group_commit_sync_delay大于0，然后在从库设置线程数和相关的方式。
标签：ade 最大化 重要 com relay_log ica parallel 多个 erp
原文地址：http://www.cnblogs.com/shengdimaya/p/6972278.html
