目录
[问题表现：应用中查询 表提示 表不存在](#问题表现：应用中查询 表提示 表不存在)
[1、查询表名大小写敏感情况： show global variables like '%case%';](#1、查询表名大小写敏感情况： show global variables like '%case%';)
[2、修改mariadb 配置设置大小写 不敏感](#2、修改mariadb 配置设置大小写 不敏感)
[mysql 配置大小写不敏感](#mysql 配置大小写不敏感)
[mariadb 10.11设置表名大小写不敏感](#mariadb 10.11设置表名大小写不敏感)
[/etc/mysql/mariadb.conf.d/ 目录下的文件](#/etc/mysql/mariadb.conf.d/ 目录下的文件)
[总结：在mariadb 10.11以及以后的版本中，要配置表名大小写敏感问题，一般修改修改配置文件：/etc/mysql/mariadb.conf.d/50-server.cnf 在 [mysqld] 段 添加属性：lower_case_table_names=1 然后重启服务](#总结：在mariadb 10.11以及以后的版本中，要配置表名大小写敏感问题，一般修改修改配置文件：/etc/mysql/mariadb.conf.d/50-server.cnf 在 [mysqld] 段 添加属性：lower_case_table_names=1 然后重启服务)
问题表现：应用中查询 表提示 表不存在
问题处理办法： 1、先确认表存在，然后再确认数据库中表名的大小写。与mysql 一致再 mariadb中：
lower_case_file_system：表示当前系统文件是否大小写敏感（ON为不敏感，OFF为敏感），只读参数，无法修改。
lower_case_table_names：表示表名是否大小写敏感，可以修改。
lower_case_table_names = 0时，mysql会根据表名直接操作，大小写敏感
lower_case_table_names = 1时，大小写不敏感，mysql会先把表名转为小写，再执行操作。
处理步骤：
1、查询表名大小写敏感情况： show global variables like '%case%';
2、mariadb 配置设置大小写 不敏感
mariadb虽说与mysql类似，但是从mariadb 10.11开始,与mysql配置是有明显区别的（至少我这里看到是这样，具体哪个版本开始不一样，我也不知道...）
mysql 配置大小写不敏感
mysql 配置大小写不敏感操作如下：实际上以前版本的mariadb也可以这样做：
vi /etc/my.cnf 通过配置文件/etc/my.cnf下的【mysqld】添加如下内容：
|--------------------------|
| lower_case_table_names=1 |
设置好之后，重启数据库服务。
mariadb 10.11设置表名大小写不敏感
在 debian 12环境中，mariadb 10.11已经没有 /etc/my.cnf配置文件了 ：
通过find / -name my.cnf 可以查询到 ：
配置文件变成了：/etc/mysql/my.cnf
查看配置文件：/etc/mysql/my.cnf
可以发现内容如下：
The MariaDB configuration file
The MariaDB/MySQL tools read configuration files in the following order:
0. "/etc/mysql/my.cnf" symlinks to this file, reason why all the rest is read.
1. "/etc/mysql/mariadb.cnf" (this file) to set global defaults,
2. "/etc/mysql/conf.d/*.cnf" to set global options.
3. "/etc/mysql/mariadb.conf.d/*.cnf" to set MariaDB-only options.
4. "~/.my.cnf" to set user-specific options.
If the same option is defined multiple times, the last one will apply.
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.
If you are new to MariaDB, check out https://mariadb.com/kb/en/basic-mariadb-articles/
This group is read both by the client and the server
use it for options that affect everything
client-server
Port or socket location where to connect
port = 3306
socket = /run/mysqld/mysqld.sock
mysqld
lower_case_table_names=1
Import all .cnf files from configuration directory
!includedir /etc/mysql/conf.d/
!includedir /etc/mysql/mariadb.conf.d/
关键信息：**# The MariaDB/MySQL tools read configuration files in the following order:
0. "/etc/mysql/my.cnf" symlinks to this file, reason why all the rest is read.
1. "/etc/mysql/mariadb.cnf" (this file) to set global defaults,
2. "/etc/mysql/conf.d/*.cnf" to set global options.
3. "/etc/mysql/mariadb.conf.d/*.cnf" to set MariaDB-only options.
4. "~/.my.cnf" to set user-specific options.**
可以看到 读取的配置文件顺序为：
1、 /etc/mysql/my.cnf、
2、/etc/mysql/mariadb.cnf、
3、/etc/mysql/conf.d/*.cnf
4、/etc/mysql/mariadb.conf.d/ 以及 ~/.my.cnf
结合说明，可以发现 以往的
mysqld
lower_case_table_names=1 在 /etc/mysql/my.cnf 是没有生效的。
查看其他配置文件：cat /etc/mysql/mariadb.cnf
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| cat /etc/mysql/mariadb.cnf # The MariaDB configuration file # # The MariaDB/MySQL tools read configuration files in the following order: # 0. "/etc/mysql/my.cnf" symlinks to this file, reason why all the rest is read. # 1. "/etc/mysql/mariadb.cnf" (this file) to set global defaults, # 2. "/etc/mysql/conf.d/*.cnf" to set global options. # 3. "/etc/mysql/mariadb.conf.d/*.cnf" to set MariaDB-only options. # 4. "~/.my.cnf" to set user-specific options. # # If the same option is defined multiple times, the last one will apply. # # 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. # # If you are new to MariaDB, check out https://mariadb.com/kb/en/basic-mariadb-articles/ # # This group is read both by the client and the server # use it for options that affect everything # [client-server] # Port or socket location where to connect port = 3306 socket = /run/mysqld/mysqld.sock [mysqld] lower_case_table_names=1 # Import all .cnf files from configuration directory !includedir /etc/mysql/conf.d/ !includedir /etc/mysql/mariadb.conf.d/ |
可以看到 在 /etc/mysql/mariadb.cnf 中设置 [mysqld]
lower_case_table_names=1 也是无效的。
查看其他配置文件：
在/etc/mysql/conf.d文件夹下有：mysql.cnf 以及 mysqldump.cnf
cat mysql.cnf
可见：mysql段的设定单独提取到了：/etc/mysql/conf.d/mysql.cnf 里：
尝试 在**/etc/mysql/conf.d/mysql.cnf**里加上 lower_case_table_names=1 ：
然后重启 mariadb 服务再验证：
直接报错：mysql: unknown variable 'lower_case_table_names=1' 可见这种方式也不行。需要把配置文件 /etc/mysql/conf.d/mysql.cnf还原回来。
/etc/mysql/mariadb.conf.d/ 目录下的文件
先看一下 /etc/mysql/mariadb.conf.d/ 目录下的文件：
实在不知道 文件用处，直接cat 查看，比如，当前我使用的这个mariadb 10.11的版本
50-client.cnf文件内容：
This group is read by the client library
Use it for options that affect all clients, but not the server
client
Example of client certificate usage
#ssl-cert = /etc/mysql/client-cert.pem
#ssl-key = /etc/mysql/client-key.pem
Allow only TLS encrypted connections
#ssl-verify-server-cert = on
This group is *never* read by mysql client library, though this
/etc/mysql/mariadb.cnf.d/client.cnf file is not read by Oracle MySQL
client anyway.
If you use the same .cnf file for MySQL and MariaDB,
use it for MariaDB-only client options
client-mariadb
default-character-set=utf8mb4
50-server.cnf 文件内容如下：
These groups are read by MariaDB server.
Use it for options that only the server (but not clients) should see
this is read by the standalone daemon and embedded servers
server
this is only for the mysqld standalone daemon
mysqld
* Basic Settings
#user = mysql
pid-file = /run/mysqld/mysqld.pid
basedir = /usr
#datadir = /var/lib/mysql
#tmpdir = /tmp
Broken reverse DNS slows down connections considerably and name resolve is
safe to skip if there are no "host by domain name" access grants
#skip-name-resolve
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_size = 128M
#max_allowed_packet = 1G
#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_options = BACKUP
#max_connections = 100
#table_cache = 64
* Logging and Replication
Note: The configured log file or its directory need to be created
and be writable by the mysql user, e.g.:
$ sudo mkdir -m 2750 /var/log/mysql
$ sudo chown mysql /var/log/mysql
Both location gets rotated by the cronjob.
Be aware that this log type is a performance killer.
Recommend only changing this at runtime for short testing periods if needed!
#general_log_file = /var/log/mysql/mysql.log
#general_log = 1
When running under systemd, error logging goes via stdout/stderr to journald
and when running legacy init error logging goes to syslog due to
/etc/mysql/conf.d/mariadb.conf.d/50-mysqld_safe.cnf
Enable this if you want to have error logging into a separate file
#log_error = /var/log/mysql/error.log
Enable the slow query log to see queries with especially long duration
#log_slow_query_file = /var/log/mysql/mariadb-slow.log
#log_slow_query_time = 10
#log_slow_verbosity = query_plan,explain
#log-queries-not-using-indexes
#log_slow_min_examined_row_limit = 1000
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
* SSL/TLS
For documentation, please read
https://mariadb.com/kb/en/securing-connections-for-client-and-server/
#ssl-ca = /etc/mysql/cacert.pem
#ssl-cert = /etc/mysql/server-cert.pem
#ssl-key = /etc/mysql/server-key.pem
#require-secure-transport = on
* Character sets
MySQL/MariaDB default is Latin1, but in Debian we rather default to the full
utf8 4-byte character set. See also client.cnf
character-set-server = utf8mb4
collation-server = utf8mb4_general_ci
* 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!
Most important is to give InnoDB 80 % of the system RAM for buffer use:
https://mariadb.com/kb/en/innodb-system-variables/#innodb_buffer_pool_size
#innodb_buffer_pool_size = 8G
this is only for embedded server
embedded
This group is only read by MariaDB servers, not by MySQL.
If you use the same .cnf file for MySQL and MariaDB,
you can put MariaDB-only options here
mariadb
This group is only read by MariaDB-10.11 servers.
If you use the same .cnf file for MariaDB of different versions,
use this group for options that older servers don't understand
mariadb-10.11
发现在 50-server.cnf文件中 有 [mysqld] 段的配置，尝试把 表名 大小写 敏感设定写在这里：
即：/etc/mysql/mariadb.conf.d/50-server.cnf
然后重启： systemctl restart mariadb
再登录，查看表名大小写敏感设置： show global variables like '%case%';
