非常慢(1 秒)的连接 [英] Very slow (1 second) connections

问题描述

我在 Windows 7 上运行 MySQL 5.6(64 位).我正在测试最近在 32 位 Windows 7 上从 MySQL 5.0 升级的数据库.(我还复制了 my.ini，做了一些更改)

我发现建立连接需要很长时间(大约 1 秒).例如，我创建了一个非常简单的 SQL 脚本:

选择1作为n；

然后我在批处理文件中运行了 10 次，需要 10 秒才能完成:

mysql -h localhost -u root -D myschema 0<脚本.sql

(是的，这里没有密码，这是一个只监听127.0.0.1的测试数据库)

有人知道为什么这么慢吗?(见下面的 my.ini)

[客户端]端口=3306[mysql]默认字符集=latin1[mysqld]端口=3306绑定地址=127.0.0.1basedir="C:/Program Files/MySQL/mysql-5.6.10-winx64/"数据目录=C:/数据字符集服务器=latin1默认存储引擎=myisamsql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"最大连接数=100query_cache_size=0table_open_cache=256tmp_table_size=18M线程缓存大小=8myisam_max_sort_file_size=100Gmyisam_sort_buffer_size=35Mkey_buffer_size=25Mread_buffer_size=64Kread_rnd_buffer_size=256Ksort_buffer_size=256Kinnodb_additional_mem_pool_size=2Minnodb_flush_log_at_trx_commit=1innodb_log_buffer_size=1Minnodb_buffer_pool_size=47Minnodb_log_file_size=24Minnodb_thread_concurrency=8log-bin=c:/data/mysql/binarylogmax_binlog_size=1024M启用命名管道慢查询日志=expire_logs_days=90

解决方案

Doh！看来这是个骗子.见:

为什么连接MySQL服务器这么慢?p>

https://serverfault.com/questions/408550/connecting-to-mysql-from-php-is-extremely-slow

我在 64 位机器上启用了 IPv6，而不是 32 位机器.当我连接以下备用字符串时，事情会快得多:

mysql -h 127.0.0.1 -u root -D myschema 0<脚本.sql

仍然不确定为什么会发生这种情况，但至少有一个解决方法！唉，可怜的 localhost 我很了解他.

以下对 my.ini 的更改允许在脚本和连接字符串中使用 localhost:

绑定地址=::1

注意:绑定到 ::ffff:127.0.0.1 或 localhost 似乎没有帮助.我读到将 IPv6 和 IPv4 地址绑定到 MySQL 服务器，所以所有 3 个连接字符串都可以工作(例如 -h ::1、-h 127.0.0.1、-h 本地主机).但是，我一次只能让其中一两个客户端字符串工作.

按以下方式绑定:

绑定地址=*

彻底解决了这个问题，IPv4 和 IPv6 客户端都可以连接.唯一的缺点是现在允许远程连接.我还没有找到一种方法来使用带有 localhost 限制的 TCP 并绑定到 127.0.0.1 和 ::1.

I'm running MySQL 5.6 (64-bit) on Windows 7. I'm testing a DB recently upgraded from MySQL 5.0 on 32-bit Windows 7. (I also copied my.ini, with a few changes)

I'm finding that it takes a very long time to establish a connection (on the order of 1 second). As an example, I created a very simple SQL script:

select 1 as n;

I then ran this in a batch file 10 times which took 10 seconds to complete:

mysql -h localhost -u root -D myschema 0< myscript.sql

(Yes, there is no password here, this is a test DB listening only to 127.0.0.1)

Anyone have an idea why this is so very slow? (See my.ini below)

[client]
port=3306
[mysql]
default-character-set=latin1
[mysqld]
port=3306
bind-address=127.0.0.1
basedir="C:/Program Files/MySQL/mysql-5.6.10-winx64/"
datadir=C:/DATA
character-set-server=latin1
default-storage-engine=myisam
sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"
max_connections=100
query_cache_size=0
table_open_cache=256
tmp_table_size=18M
thread_cache_size=8
myisam_max_sort_file_size=100G
myisam_sort_buffer_size=35M
key_buffer_size=25M
read_buffer_size=64K
read_rnd_buffer_size=256K
sort_buffer_size=256K
innodb_additional_mem_pool_size=2M
innodb_flush_log_at_trx_commit=1
innodb_log_buffer_size=1M
innodb_buffer_pool_size=47M
innodb_log_file_size=24M
innodb_thread_concurrency=8
log-bin=c:/data/mysql/binarylog
max_binlog_size=1024M
enable-named-pipe
slow_query_log=
expire_logs_days=90

解决方案

Doh! Looks like this is a dupe. See:

Why is connecting to MySQL server so slow?

https://serverfault.com/questions/408550/connecting-to-mysql-from-php-is-extremely-slow

I've got IPv6 enabled on the 64-bit machine and not the 32-bit machine. When I connect with the following alternate string, things are much quicker:

mysql -h 127.0.0.1 -u root -D myschema 0< myscript.sql

Still not sure why this is happening, but at least there's a workaround! Alas poor localhost I knew him well.

EDIT: The following change to my.ini allows use of localhost in scripts and connection strings:

bind-address=::1

Note: Binding to ::ffff:127.0.0.1 or localhost didn't seem to help. I read about binding both IPv6 and IPv4 addresses to MySQL server so all 3 connection strings would work (e.g. -h ::1, -h 127.0.0.1, -h localhost). However, I was only able to get one or two of those client strings to work at a time.

EDIT2: Binding in the following way:

bind-address=*

Completely resolves this issue and both IPv4 and IPv6 clients can connect. The only drawback being that remote connections are now allowed. I haven't found a way to use TCP with localhost restrictions and bind to both 127.0.0.1 and ::1.

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