mysql sync_binlog参数实验
1，默认参数为1，即每次提交MySQL将进行一次fsync之类的磁盘同步指令来将binlog_cache中的数据强制写入磁盘
mysql> show variables like '%sync_binlog%';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| sync_binlog| 1 |
+---------------+-------+
1 row in set (0.01 sec)


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2，实验环境搭建
清除测试表t
mysql> truncate t;
Query OK, 0 rows affected (0.02 sec)


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创建一个存储过程p1，往t表中进行五千次的插入，每次插入都提交
mysql> DELIMITER //
mysql> CREATE PROCEDURE p1()
-> begin
-> declare i int;
-> set i=0;
-> while i<5000 do
-> insert into t values(i);
-> set i=i+1;
-> commit;
-> end while;
-> end;
-> //
Query OK, 0 rows affected (0.00 sec)


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3，当sync_binlog=1时，p1执行14.04秒
mysql>
mysql> call p1;
Query OK, 0 rows affected (14.04 sec)


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4，当sync_binlog=0时，p1执行6.94秒
mysql> set global sync_binlog=0;
Query OK, 0 rows affected (0.00 sec)


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mysql> truncate t;
Query OK, 0 rows affected (0.02 sec)


mysql> call p1;
Query OK, 0 rows affected (6.94 sec)


5，当sync_binlog=5时，p1执行8.28秒
mysql> set global sync_binlog=5;
Query OK, 0 rows affected (0.00 sec)


mysql> truncate t;
Query OK, 0 rows affected (0.02 sec)


mysql> call p1;
Query OK, 0 rows affected (8.28 sec)
mysql>