这几天在研究mysql数据同步，查看一些资料发现5.7版本可以使用gtid来实现主备数据库的数据同步。

经过一些折腾，搭建完毕，在master上建库、建表、插入数据，在从库上都能看到。看来一切正常。

随着测试的深入发现了一些问题，通过一个存储过程批量往表里插入10000条数据，发现速度慢的离奇。

如果不开启gtid只是单个数据库的话速度很快。

存储过程如下：

DELIMITER ;;

create procedure vip5()

begin

declare i int default 0;

while i < 100000

do

insert into a values(1,2);

set i = i + 1;

end while;

end;;

后来发现原来是autocommit(自动提交，把数据从内存写入磁盘)搞得鬼，在执行存储过程前先执行set autocommit=0，问题解决。

my.cnf配置如下：

master：

[mysqld]

datadir=/var/lib/mysql

socket=/var/lib/mysql/mysql.sock

gtid-mode = on

enforce-gtid-consistency = 1

log-bin = /var/lib/mysql/mysql-bin-gtid

server-id = 3306100

binlog_format = row

skip_slave_start = 1

symbolic-links=0

log-error=/var/log/mysqld.log

pid-file=/var/run/mysqld/mysqld.pid

sync_binlog = 1

#-------------------gobal variables------------#

max_connect_errors = 100000

max_connections = 10000

wait_timeout = 3600

interactive_timeout = 3600

net_read_timeout = 3600

net_write_timeout = 3600

table_open_cache = 2000

table_definition_cache = 2000

open_files_limit = 20000

thread_cache_size = 512

#thread_handling = pool-of-threads

#thread_pool_max_threads = 5000

#thread_pool_size = 8

character-set-server = utf8

collation-server = utf8_general_ci

skip_external_locking

performance_schema = 1

myisam_recover_options = DEFAULT

skip-name-resolve

local_infile = 0

lower_case_table_names = 0

key_buffer_size = 384M

max_allowed_packet = 128M

master_info_repository = table

relay_log_info_repository = table

#--------------------innoDB------------#

innodb_buffer_pool_size = 1G

#innodb_data_file_path = ibdata1:200M:autoextend

innodb_flush_log_at_trx_commit = 0

innodb_io_capacity = 3000

innodb_lock_wait_timeout = 30

innodb_log_buffer_size = 8M

innodb_log_file_size = 200M

innodb_log_files_in_group = 3

innodb_max_dirty_pages_pct = 85

innodb_read_io_threads = 8

innodb_write_io_threads = 8

innodb_support_xa = 1

innodb_thread_concurrency = 8

innodb_file_per_table

innodb_rollback_on_timeout

#------------session variables-------#

join_buffer_size = 8M

bulk_insert_buffer_size = 32M

max_heap_table_size = 96M

tmp_table_size = 96M

read_buffer_size = 16M

sort_buffer_size = 4M

read_rnd_buffer_size = 32M

expire_logs_days = 15

max_binlog_size = 200M

binlog_cache_size = 64k

log_warnings = 1

long_query_time = 0.125

##log_timestamps=SYSTEM

#---------------replicate--------------#

#slave-parallel-threads = 4

slave_parallel_workers=4

#slave_parallel_type='logical_clock'

replicate-ignore-db = mysql_identity

init_slave = 'set sql_mode=STRICT_ALL_TABLES'

log-slave-updates = 1

slave：

[mysqld]

datadir=/var/lib/mysql

socket=/var/lib/mysql/mysql.sock

gtid-mode = on

enforce-gtid-consistency = 1

log-bin = /var/lib/mysql/mysql-bin-gtid

server-id = 3306101

binlog_format = row

skip_slave_start = 1

symbolic-links=0

log-error=/var/log/mysqld.log

pid-file=/var/run/mysqld/mysqld.pid

sync_binlog = 1

#-------------------gobal variables------------#

max_connect_errors = 100000

max_connections = 10000

wait_timeout = 3600

interactive_timeout = 3600

net_read_timeout = 3600

net_write_timeout = 3600

table_open_cache = 2000

table_definition_cache = 2000

open_files_limit = 20000

thread_cache_size = 512

#thread_handling = pool-of-threads

#thread_pool_max_threads = 5000

#thread_pool_size = 8

character-set-server = utf8

collation-server = utf8_general_ci

skip_external_locking

performance_schema = 1

myisam_recover_options = DEFAULT

skip-name-resolve

local_infile = 0

lower_case_table_names = 0

key_buffer_size = 384M

max_allowed_packet = 128M

master_info_repository = table

relay_log_info_repository = table

#--------------------innoDB------------#

innodb_buffer_pool_size = 1G

#innodb_data_file_path = ibdata1:200M:autoextend

innodb_flush_log_at_trx_commit = 0

innodb_io_capacity = 3000

innodb_lock_wait_timeout = 30

innodb_log_buffer_size = 8M

innodb_log_file_size = 200M

innodb_log_files_in_group = 3

innodb_max_dirty_pages_pct = 85

innodb_read_io_threads = 8

innodb_write_io_threads = 8

innodb_support_xa = 1

innodb_thread_concurrency = 8

innodb_file_per_table

innodb_rollback_on_timeout

#------------session variables-------#

join_buffer_size = 8M

bulk_insert_buffer_size = 32M

max_heap_table_size = 96M

tmp_table_size = 96M

read_buffer_size = 16M

sort_buffer_size = 4M

read_rnd_buffer_size = 32M

expire_logs_days = 15

max_binlog_size = 200M

binlog_cache_size = 64k

log_warnings = 1

long_query_time = 0.125

##log_timestamps=SYSTEM

#---------------replicate--------------#

#slave-parallel-threads = 4

slave_parallel_workers=4

#slave_parallel_type='logical_clock'

replicate-ignore-db = mysql_identity

init_slave = 'set sql_mode=STRICT_ALL_TABLES'

log-slave-updates = 1