我刚刚重新安装了Windows 7，现在正在尝试重新建立我的开发环境。XAMPP已经安装成功，我的应用程序在htdocs文件夹中，所有的数据库也已经成功导入了。我可以在phpMyAdmin中查看它们，所有的东西都完好无损。
但是，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超时。
例如，这台电脑之前可以在3秒内生成的页面，现在需要30秒或更长时间，最终页面超时。
这是一个XAMPP 1.7.7安装程序，但我尝试回滚到旧版本也得到了相同的结果。
日志文件中没有任何内容，因为它实际上并没有出现错误，只是查询非常缓慢。
即使通过phpMyAdmin浏览数据库也需要3-10秒才能加载页面，而以前是瞬间完成的。因此，这排除了我的应用程序（因为它自上一次快速运行以来并没有更改）。
有什么想法可以解释为什么在新安装的XAMPP中会出现如此大的速度下降吗？我的httpd.conf、php.ini或my.ini文件中可能设置了什么（在重新安装后被擦除），导致数据库访问变慢吗？
谢谢！
#----------------------------------------------------
# !!!! 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
使用此技术的样本配置文件（在Windows上测试了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
query-cache-size => query_cache_size。 - Safareliinnodb_additional_mem_pool_size现已弃用。 - Jonathaninnodb-buffer-pool-size = 1000M 这个设置在我的情况下解决了问题。我的查询非常慢，只有7个连接，需要11秒到15秒的时间，这太疯狂了。我猜测这个设置意味着数据库可以使用的内存量，因为在配置文件中写明了可以将其设置为总内存的50%。 - late1