我在my.cnf文件中设置了lower_case_table_names = 2。设置变量后，我重新启动了mysql服务器，但当我使用SHOW VARIABLES时，值仍为0。
我正在使用MySQL 5.5。任何想法还有什么需要做的吗？
更新
my.cnf位于/etc和/etc/mysql（ubuntu OS）
内容： -
#
# The MySQL database server configuration file.
#
# You can copy this to one of:
# - "/etc/mysql/my.cnf" to set global options,
# - "~/.my.cnf" to set user-specific options.
#
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html
# This will be passed to all mysql clients
# It has been reported that passwords should be enclosed with ticks/quotes
# escpecially if they contain "#" chars...
# Remember to edit /etc/mysql/debian.cnf when changing the socket location.
[client]
port = 3306
socket = /var/run/mysqld/mysqld.sock
# Here is entries for some specific programs
# The following values assume you have at least 32M ram
# This was formally known as [safe_mysqld]. Both versions are currently parsed.
[mysqld_safe]
socket = /var/run/mysqld/mysqld.sock
nice = 0
[mysqld]
#
# * Basic Settings
#
lower_case_table_names = 2
user = mysql
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
port = 3306
basedir = /usr
datadir = /var/lib/mysql
tmpdir = /tmp
lc-messages-dir = /usr/share/mysql
skip-external-locking
#
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
bind-address = 127.0.0.1
#
# * Fine Tuning
#
key_buffer = 16M
max_allowed_packet = 16M
thread_stack = 192K
thread_cache_size = 8
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched
myisam-recover = BACKUP
#max_connections = 100
#table_cache = 64
#thread_concurrency = 10
#
# * Query Cache Configuration
#
query_cache_limit = 1M
query_cache_size = 16M
#
# * Logging and Replication
#
# Both location gets rotated by the cronjob.
# Be aware that this log type is a performance killer.
# As of 5.1 you can enable the log at runtime!
#general_log_file = /var/log/mysql/mysql.log
#general_log = 1
#
# Error log - should be very few entries.
#
log_error = /var/log/mysql/error.log
#
# Here you can see queries with especially long duration
#log_slow_queries = /var/log/mysql/mysql-slow.log
#long_query_time = 2
#log-queries-not-using-indexes
#
# The following can be used as easy to replay backup logs or for replication.
# note: if you are setting up a replication slave, see README.Debian about
# other settings you may need to change.
#server-id = 1
#log_bin = /var/log/mysql/mysql-bin.log
expire_logs_days = 10
max_binlog_size = 100M
#binlog_do_db = include_database_name
#binlog_ignore_db = include_database_name
#
# * InnoDB
#
# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
# Read the manual for more InnoDB related options. There are many!
#
# * Security Features
#
# Read the manual, too, if you want chroot!
# chroot = /var/lib/mysql/
#
# For generating SSL certificates I recommend the OpenSSL GUI "tinyca".
#
# ssl-ca=/etc/mysql/cacert.pem
# ssl-cert=/etc/mysql/server-cert.pem
# ssl-key=/etc/mysql/server-key.pem
[mysqldump]
quick
quote-names
max_allowed_packet = 16M
[mysql]
#no-auto-rehash # faster start of mysql but no tab completition
[isamchk]
key_buffer = 16M
#
# * IMPORTANT: Additional settings that can override those from this file!
# The files must end with '.cnf', otherwise they'll be ignored.
#
!includedir /etc/mysql/conf.d/
答案 0 :(得分：3)
最明显的可能性：
显示 my.cnf 文件中的内容，路径是什么，以及重启服务器的具体方式，我将详细说明我的答案。
更新：您不应在UNIX（或任何具有区分大小写的文件系统的系统）上使用值“2”
从手册（http://dev.mysql.com/doc/refman/5.0/en/identifier-case-sensitivity.html）：
如果您只在一个平台上使用MySQL，则通常不会 从其默认值更改 lower_case_table_names 变量。 但是，如果要传输表，可能会遇到困难 在文件系统区分大小写不同的平台之间。对于 例如，在Unix上，您可以有两个名为 my_table 的表 MY_TABLE ，但在Windows上，这两个名称被认为是相同的。至 避免数据库或信件箱引起的数据传输问题 表名，你有两个选择：
在所有系统上使用 lower_case_table_names = 1 。主要缺点 这是当你使用 SHOW TABLES 或 SHOW DATABASES 时，你做的是 没有看到原始字母的名字。
在 Unix 和 lower_case_table_names = 2 上使用 lower_case_table_names = 0 的视窗即可。这样可以保留数据库和表名的字母大小写。 这样做的缺点是你必须确保你的陈述 总是用正确的方式引用你的数据库和表名 Windows上的字母。如果您将语句转移到Unix，那么 lettercase很重要，如果是lettercase，它们不起作用 不正确。
例外：如果您使用 InnoDB 表，并且您正试图避免 这些数据传输问题，您应该将 lower_case_table_names 设置为 所有平台上的 1 强制将名称转换为小写。
你想要完成什么？你为什么要把它设置为2？
答案 1 :(得分：0)
我想my.cnf的位置取决于你安装mysql服务器的方式。 我遇到了类似的问题，在/ etc / mysql / dir中设置了lower_case_table_names = 1。由mysql提起它。 问题是我安装它的方式。我已经下载了xampp zip并将其解压缩到/ opt /。 如果你做了同样的事情，你需要将变量添加到my.cnf到
/opt/lampp/etc/my.cnf
代码如下所示：
[mysqld]
lower_case_table_names = 1
user = nobody
port = 3306
...
希望这有帮助