MySQL 查询在新的 XAMPP 安装中非常慢[关闭]

Posted 2023-02-25

【中文标题】MySQL 查询在新的 XAMPP 安装中非常慢[关闭]

【英文标题】：MySQL queries extremely slow in fresh XAMPP installation [closed]

【发布时间】：2011-12-26 01:14:56

【问题描述】：

我刚刚重新安装了 Windows 7，我正在尝试让我的开发环境重新启动并运行。 XAMPP 安装正常，我的应用程序在 htdocs 中，所有数据库都已正常导入。我可以在 phpMyAdmin 中查看它们，一切看起来都完好无损。

在尝试运行应用程序时，查询速度非常慢，以至于大多数页面在所有查询完成之前就超时了。

例如，这台计算机之前可以在 3 秒内生成的页面，现在增加到 30 秒并且页面超时。

这是一个 XAMPP 安装 1.7.7，但我尝试回滚到他们的旧版本并得到相同的结果。

日志文件中没有任何内容，因为它实际上并没有出错，它只是执行查询非常缓慢。

即使通过 phpMyAdmin 导航数据库也需要大约 3-10 秒来加载页面，而之前它是即时的。所以这消除了我的应用程序（它也没有改变，因为它以前工作得非常快）。

有什么想法会导致新的 xampp 安装速度大幅下降吗？ httpd.conf、php.ini 或 my.ini 中是否有我之前设置的内容被全新安装擦除，现在可能导致数据库访问速度变慢？

谢谢！

【问题讨论】：

你的表有多少条记录？哪些查询需要这么长时间？你确定这是查询而不是其他什么（可能是无限循环？）？

嗨 Shef - 它与我在这台机器上重新安装 Windows 和 XAMPP 之前完全相同的数据库和应用程序。它以前工作得很好，没有任何改变。不过谢谢！

【参考方案1】：

问题似乎出在 mysql 的查询缓存和 InnoDB 设置中。虽然 XAMPP 在 my.ini 中有 InnoDB 行，但还有一些需要添加。

以下是我从之前的构建中保存的配置。当我将这些添加到 my.ini 并重新启动服务器时，一切似乎又全速运行了。

我不确定这是否解决了潜在的减速问题，或者查询缓存的使用现在是否只是掩盖了它，但它运行得很好！继续开发！

    #----------------------------------------------------
    #          !!!! Query Cache Config !!!!
    #----------------------------------------------------

    query-cache-size = 524288000
    query-cache-limit = 5242880
    query-cache-type = 1

    #----------------------------------------------------
    #          !!!! InnoDB Buffer Config !!!!
    #----------------------------------------------------

    innodb-buffer-pool-size = 1000M
    innodb-additional-mem-pool-size = 200M
    innodb-log-files-in-group = 2
    innodb-log-buffer-size = 10M
    innodb-file-per-table = 1

更新

使用此技术的示例配置文件（在 Windows 上测试的 MySQL 5.7）

# The following options will be passed to all MySQL clients
[client] 
# password       = your_password 
port            = 3306 
socket          = "C:/xampp/mysql/mysql.sock"


# Here follows entries for some specific programs 

# The MySQL server
[mysqld]
port= 3306
socket = "C:/xampp/mysql/mysql.sock"
basedir = "C:/xampp/mysql" 
tmpdir = "C:/xampp/tmp" 
datadir = "C:/xampp/mysql/data"
pid_file = "mysql.pid"
# enable-named-pipe
key_buffer = 16M
max_allowed_packet = 1M
sort_buffer_size = 512K
net_buffer_length = 8K
read_buffer_size = 256K
read_rnd_buffer_size = 512K
myisam_sort_buffer_size = 8M
log_error = "mysql_error.log"

# Change here for bind listening
# bind-address="127.0.0.1" 
# bind-address = ::1          # for ipv6

# Where do all the plugins live
plugin_dir = "C:/xampp/mysql/lib/plugin/" 

# Don't listen on a TCP/IP port at all. This can be a security enhancement,
# if all processes that need to connect to mysqld run on the same host.
# All interaction with mysqld must be made via Unix sockets or named pipes.
# Note that using this option without enabling named pipes on Windows
# (via the "enable-named-pipe" option) will render mysqld useless!
# 
# commented in by lampp security
#skip-networking
#skip-federated

# Replication Master Server (default)
# binary logging is required for replication
# log-bin deactivated by default since XAMPP 1.4.11
#log-bin=mysql-bin

# required unique id between 1 and 2^32 - 1
# defaults to 1 if master-host is not set
# but will not function as a master if omitted
server-id   = 1

# Replication Slave (comment out master section to use this)
#
# To configure this host as a replication slave, you can choose between
# two methods :
#
# 1) Use the CHANGE MASTER TO command (fully described in our manual) -
#    the syntax is:
#
#    CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>,
#    MASTER_USER=<user>, MASTER_PASSWORD=<password> ;
#
#    where you replace <host>, <user>, <password> by quoted strings and
#    <port> by the master's port number (3306 by default).
#
#    Example:
#
#    CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306,
#    MASTER_USER='joe', MASTER_PASSWORD='secret';
#
# OR
#
# 2) Set the variables below. However, in case you choose this method, then
#    start replication for the first time (even unsuccessfully, for example
#    if you mistyped the password in master-password and the slave fails to
#    connect), the slave will create a master.info file, and any later
#    change in this file to the variables' values below will be ignored and
#    overridden by the content of the master.info file, unless you shutdown
#    the slave server, delete master.info and restart the slaver server.
#    For that reason, you may want to leave the lines below untouched
#    (commented) and instead use CHANGE MASTER TO (see above)
#
# required unique id between 2 and 2^32 - 1
# (and different from the master)
# defaults to 2 if master-host is set
# but will not function as a slave if omitted
#server-id       = 2
#
# The replication master for this slave - required
#master-host     =   <hostname>
#
# The username the slave will use for authentication when connecting
# to the master - required
#master-user     =   <username>
#
# The password the slave will authenticate with when connecting to
# the master - required
#master-password =   <password>
#
# The port the master is listening on.
# optional - defaults to 3306
#master-port     =  <port>
#
# binary logging - not required for slaves, but recommended
#log-bin=mysql-bin


# Point the following paths to different dedicated disks
#tmpdir = "C:/xampp/tmp"
#log-update = /path-to-dedicated-directory/hostname

# Uncomment the following if you are using BDB tables
#bdb_cache_size = 4M
#bdb_max_lock = 10000

# Comment the following if you are using InnoDB tables
#skip-innodb
innodb_data_home_dir = "C:/xampp/mysql/data"
innodb_data_file_path = ibdata1:10M:autoextend
innodb_log_group_home_dir = "C:/xampp/mysql/data"
#innodb_log_arch_dir = "C:/xampp/mysql/data"
## You can set .._buffer_pool_size up to 50 - 80 %
## of RAM but beware of setting memory usage too high
innodb_buffer_pool_size = 1000M
innodb_additional_mem_pool_size = 200M
## Set .._log_file_size to 25 % of buffer pool size
innodb_log_file_size = 250M
innodb_log_buffer_size = 10M
innodb_flush_log_at_trx_commit = 1
innodb_lock_wait_timeout = 50

## UTF 8 Settings
#init-connect=\'SET NAMES utf8\'
#collation_server=utf8_unicode_ci
#character_set_server=utf8
#skip-character-set-client-handshake
#character_sets-dir="C:/xampp/mysql/share/charsets"

[mysqldump]
quick
max_allowed_packet = 16M

[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates

[isamchk]
key_buffer = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M

[myisamchk]
key_buffer = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout

【讨论】：

它也适用于 1.8.1 Xampp

适用于 XAMPP 版本 1.8.3，但需要将所有“-”更改为“_”，如 query-cache-size => query_cache_size

我按照这里每个人的建议进行了所有更改，但对我没有任何效果。

它对我有用，非常有帮助，非常感谢您

innodb_additional_mem_pool_size 现已弃用