数据库简介

数据库的发展史

  • 萌芽阶段:文件系统

    • 使用磁盘文件来存储数据
  • 初级阶段:第一代数据库
    • 出现了网状模型、层次模型的数据库
  • 中级阶段:第二代数据库
    • 关系型数据库和结构化查询语言
  • 高级阶段:新一代数据库
    • 关系-对象 型数据库

NoSQL非关系数据库:Not Only SQL

数据库管理系统

数据库是数据的汇集,它以一定的组织形式存于存储介质上

DBMS是管理数据库的系统软件,它实现数据库系统的各种功能。是数据库系统的核心

DBA:负责数据库的规划、设计、协调、维护和管理等工作

应用程序指以数据库为基础的应用程序

数据库管理系统的优点

  • 相互关联的数据的集合
  • 较少的数据冗余
  • 程序与数据相互独立
  • 保证数据的安全、可靠
  • 最大限度地保证数据的正确性
  • 数据可以并发使用并能同时保证一致性

MYSQL(马云生气了)系列

官方网址:

https://www.mysql.com/
http://mariadb.org/
https://www.percona.com

官方文档:

https://dev.mysql.com/doc/
https://mariadb.com/kb/en/
https://www.percona.com/software/mysql-database/percona-server

版本演变:
MySQL:5.1 --> 5.5 --> 5.6 --> 5.7 -->8.0
MariaDB:5.5 -->10.0–> 10.1 --> 10.2 --> 10.3

MYSQL的特性

  • 插件式存储引擎:也称为“表类型”,存储管理器有多种实现版本,功能和特性可能均略有差别;用户可根据需要灵活选择,Mysql5.5.5开始innoDB引擎是MYSQL默认引擎
    MyISAM ==> Aria
    InnoDB ==> XtraDB
  • 单进程,多线程
  • 诸多扩展和新特性
  • 提供了较多测试组件
  • 开源

安装MYSQL

Mariadb安装方式:

  • 源代码:编译安装
  • 二进制格式的程序包:展开至特定路径,并经过简单配置后即可使用
  • 程序包管理器管理的程序包
  • CentOS 安装光盘
    项目官方:https://downloads.mariadb.org/mariadb/repositories/
    国内镜像:https://mirrors.tuna.tsinghua.edu.cn/mariadb/yum/
    https://mirrors.tuna.tsinghua.edu.cn/mysql/yum/

centos6是最后自带mysql的版本了,在centos7中默认的是mariadb

centos 7的mariadb的安装yum源

[mariadb]
name=MariaDBbaseurl=https://mirrors.tuna.tsinghua.edu.cn/mariadb/yum/10.2/centos74-amd64/
gpgcheck=0
# 安装方法
sudo yum install MariaDB-server MariaDB-client

centos7中默认版本为5.5.64

[root@localhost ~]# yum info mariadb
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
Available Packages
Name        : mariadb
Arch        : x86_64
Epoch       : 1
Version     : 5.5.64
Release     : 1.el7
Size        : 8.7 M
Repo        : base
Summary     : A community developed branch of MySQL
URL         : http://mariadb.org
License     : GPLv2 with exceptions and LGPLv2 and BSD
Description : MariaDB is a community developed branch of MySQL.: MariaDB is a multi-user, multi-threaded SQL database server.: It is a client/server implementation consisting of a server daemon (mysqld): and many different client programs and libraries. The base package: contains the standard MariaDB/MySQL client programs and generic MySQL files.
配置yum源安装mariadb
[root@localhost ~]# vim /etc/yum.repos.d/mariadb.repo[mariadb]
name = MariaDB
baseurl = http://yum.mariadb.org/10.2/centos7-amd64
gpgkey=https://yum.mariadb.org/RPM-GPG-KEY-MariaDB
gpgcheck=1[root@localhost ~]# yum repolist
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
repo id                                      repo name                                    status
!base                                        Base                                         10,097
epel                                         Epel                                         13,329
mariadb                                      MariaDB                                          95
repolist: 23,521
文件包内容
[root@localhost ~]# rpm -ql MariaDB-server
/etc/init.d/mysql
/etc/logrotate.d/mysql
/etc/my.cnf.d
/etc/my.cnf.d/enable_encryption.preset
/etc/my.cnf.d/server.cnf
/etc/security/user_map.conf
/lib64/security/pam_user_map.so
/usr/bin/aria_chk
/usr/bin/aria_dump_log
/usr/bin/aria_ftdump
/usr/bin/aria_pack
/usr/bin/aria_read_log
/usr/bin/galera_new_cluster
/usr/bin/galera_recovery
/usr/bin/innochecksum
/usr/bin/mariadb-service-convert
/usr/bin/my_print_defaults
/usr/bin/myisam_ftdump
/usr/bin/myisamchk
/usr/bin/myisamlog
/usr/bin/myisampack
/usr/bin/mysql_convert_table_format
/usr/bin/mysql_fix_extensions
/usr/bin/mysql_install_db
/usr/bin/mysql_secure_installation
/usr/bin/mysql_setpermission
/usr/bin/mysql_tzinfo_to_sql
/usr/bin/mysql_upgrade
/usr/bin/mysqld_multi
/usr/bin/mysqld_safe
/usr/bin/mysqld_safe_helper
/usr/bin/mysqldumpslow
/usr/bin/mysqlhotcopy
/usr/bin/perror
/usr/bin/replace
/usr/bin/resolve_stack_dump
/usr/bin/resolveip
/usr/bin/wsrep_sst_common
/usr/bin/wsrep_sst_mariabackup
/usr/bin/wsrep_sst_mysqldump
/usr/bin/wsrep_sst_rsync
/usr/bin/wsrep_sst_rsync_wan
/usr/bin/wsrep_sst_xtrabackup
/usr/bin/wsrep_sst_xtrabackup-v2
/usr/lib/systemd/system/mariadb.service
/usr/lib/systemd/system/mariadb@.service
/usr/lib/systemd/system/mariadb@bootstrap.service.d
/usr/lib/systemd/system/mariadb@bootstrap.service.d/use_galera_new_cluster.conf
/usr/lib/sysusers.d
/usr/lib/sysusers.d/mariadb.conf
/usr/lib/tmpfiles.d/mariadb.conf
/usr/lib64/libmysqld.so
/usr/lib64/libmysqld.so.19
/usr/lib64/mysql
/usr/lib64/mysql/plugin
/usr/lib64/mysql/plugin/auth_ed25519.so
/usr/lib64/mysql/plugin/auth_pam.so
/usr/lib64/mysql/plugin/auth_socket.so
/usr/lib64/mysql/plugin/disks.so
/usr/lib64/mysql/plugin/file_key_management.so
/usr/lib64/mysql/plugin/ha_archive.so
/usr/lib64/mysql/plugin/ha_blackhole.so
/usr/lib64/mysql/plugin/ha_federated.so
/usr/lib64/mysql/plugin/ha_federatedx.so
/usr/lib64/mysql/plugin/ha_mroonga.so
/usr/lib64/mysql/plugin/ha_sphinx.so
/usr/lib64/mysql/plugin/ha_spider.so
/usr/lib64/mysql/plugin/handlersocket.so
/usr/lib64/mysql/plugin/locales.so
/usr/lib64/mysql/plugin/metadata_lock_info.so
/usr/lib64/mysql/plugin/query_cache_info.so
/usr/lib64/mysql/plugin/query_response_time.so
/usr/lib64/mysql/plugin/semisync_master.so
/usr/lib64/mysql/plugin/semisync_slave.so
/usr/lib64/mysql/plugin/server_audit.so
/usr/lib64/mysql/plugin/simple_password_check.so
/usr/lib64/mysql/plugin/sql_errlog.so
/usr/lib64/mysql/plugin/wsrep_info.so
/usr/sbin/mysqld
/usr/sbin/rcmysql
/usr/share/doc/MariaDB-server-10.2.32
/usr/share/doc/MariaDB-server-10.2.32/COPYING
/usr/share/doc/MariaDB-server-10.2.32/COPYING.AGPLv3
/usr/share/doc/MariaDB-server-10.2.32/COPYING.GPLv2
/usr/share/doc/MariaDB-server-10.2.32/CREDITS
/usr/share/doc/MariaDB-server-10.2.32/EXCEPTIONS-CLIENT
/usr/share/doc/MariaDB-server-10.2.32/INSTALL-BINARY
/usr/share/doc/MariaDB-server-10.2.32/PATENTS
/usr/share/doc/MariaDB-server-10.2.32/README-wsrep
/usr/share/doc/MariaDB-server-10.2.32/README.md
/usr/share/doc/MariaDB-server-10.2.32/THIRDPARTY
/usr/share/man/man1
/usr/share/man/man1/aria_chk.1.gz
/usr/share/man/man1/aria_dump_log.1.gz
/usr/share/man/man1/aria_ftdump.1.gz
/usr/share/man/man1/aria_pack.1.gz
/usr/share/man/man1/aria_read_log.1.gz
/usr/share/man/man1/galera_new_cluster.1.gz
/usr/share/man/man1/galera_recovery.1.gz
/usr/share/man/man1/innochecksum.1.gz
/usr/share/man/man1/mariabackup.1.gz
/usr/share/man/man1/mariadb-service-convert.1.gz
/usr/share/man/man1/mbstream.1.gz
/usr/share/man/man1/my_print_defaults.1.gz
/usr/share/man/man1/myisam_ftdump.1.gz
/usr/share/man/man1/myisamchk.1.gz
/usr/share/man/man1/myisamlog.1.gz
/usr/share/man/man1/myisampack.1.gz
/usr/share/man/man1/mysql.server.1.gz
/usr/share/man/man1/mysql_convert_table_format.1.gz
/usr/share/man/man1/mysql_fix_extensions.1.gz
/usr/share/man/man1/mysql_install_db.1.gz
/usr/share/man/man1/mysql_ldb.1.gz
/usr/share/man/man1/mysql_secure_installation.1.gz
/usr/share/man/man1/mysql_setpermission.1.gz
/usr/share/man/man1/mysql_tzinfo_to_sql.1.gz
/usr/share/man/man1/mysql_upgrade.1.gz
/usr/share/man/man1/mysqld_multi.1.gz
/usr/share/man/man1/mysqld_safe.1.gz
/usr/share/man/man1/mysqld_safe_helper.1.gz
/usr/share/man/man1/mysqldumpslow.1.gz
/usr/share/man/man1/mysqlhotcopy.1.gz
/usr/share/man/man1/perror.1.gz
/usr/share/man/man1/replace.1.gz
/usr/share/man/man1/resolve_stack_dump.1.gz
/usr/share/man/man1/resolveip.1.gz
/usr/share/man/man1/wsrep_sst_common.1.gz
/usr/share/man/man1/wsrep_sst_mariabackup.1.gz
/usr/share/man/man1/wsrep_sst_mysqldump.1.gz
/usr/share/man/man1/wsrep_sst_rsync.1.gz
/usr/share/man/man1/wsrep_sst_rsync_wan.1.gz
/usr/share/man/man1/wsrep_sst_xtrabackup-v2.1.gz
/usr/share/man/man1/wsrep_sst_xtrabackup.1.gz
/usr/share/man/man8
/usr/share/man/man8/mysqld.8.gz
/usr/share/mysql
/usr/share/mysql/binary-configure
/usr/share/mysql/czech
/usr/share/mysql/czech/errmsg.sys
/usr/share/mysql/danish
/usr/share/mysql/danish/errmsg.sys
/usr/share/mysql/dutch
/usr/share/mysql/dutch/errmsg.sys
/usr/share/mysql/english
/usr/share/mysql/english/errmsg.sys
/usr/share/mysql/errmsg-utf8.txt
/usr/share/mysql/estonian
/usr/share/mysql/estonian/errmsg.sys
/usr/share/mysql/fill_help_tables.sql
/usr/share/mysql/french
/usr/share/mysql/french/errmsg.sys
/usr/share/mysql/german
/usr/share/mysql/german/errmsg.sys
/usr/share/mysql/greek
/usr/share/mysql/greek/errmsg.sys
/usr/share/mysql/hindi
/usr/share/mysql/hindi/errmsg.sys
/usr/share/mysql/hungarian
/usr/share/mysql/hungarian/errmsg.sys
/usr/share/mysql/install_spider.sql
/usr/share/mysql/italian
/usr/share/mysql/italian/errmsg.sys
/usr/share/mysql/japanese
/usr/share/mysql/japanese/errmsg.sys
/usr/share/mysql/korean
/usr/share/mysql/korean/errmsg.sys
/usr/share/mysql/magic
/usr/share/mysql/maria_add_gis_sp.sql
/usr/share/mysql/maria_add_gis_sp_bootstrap.sql
/usr/share/mysql/my-huge.cnf
/usr/share/mysql/my-innodb-heavy-4G.cnf
/usr/share/mysql/my-large.cnf
/usr/share/mysql/my-medium.cnf
/usr/share/mysql/my-small.cnf
/usr/share/mysql/mysql-log-rotate
/usr/share/mysql/mysql.server
/usr/share/mysql/mysql_performance_tables.sql
/usr/share/mysql/mysql_system_tables.sql
/usr/share/mysql/mysql_system_tables_data.sql
/usr/share/mysql/mysql_test_data_timezone.sql
/usr/share/mysql/mysql_test_db.sql
/usr/share/mysql/mysql_to_mariadb.sql
/usr/share/mysql/mysqld_multi.server
/usr/share/mysql/norwegian
/usr/share/mysql/norwegian-ny
/usr/share/mysql/norwegian-ny/errmsg.sys
/usr/share/mysql/norwegian/errmsg.sys
/usr/share/mysql/policy
/usr/share/mysql/policy/apparmor
/usr/share/mysql/policy/apparmor/README
/usr/share/mysql/policy/apparmor/usr.sbin.mysqld
/usr/share/mysql/policy/apparmor/usr.sbin.mysqld.local
/usr/share/mysql/policy/selinux
/usr/share/mysql/policy/selinux/README
/usr/share/mysql/policy/selinux/mariadb-server.fc
/usr/share/mysql/policy/selinux/mariadb-server.te
/usr/share/mysql/policy/selinux/mariadb.pp
/usr/share/mysql/policy/selinux/mariadb.te
/usr/share/mysql/polish
/usr/share/mysql/polish/errmsg.sys
/usr/share/mysql/portuguese
/usr/share/mysql/portuguese/errmsg.sys
/usr/share/mysql/romanian
/usr/share/mysql/romanian/errmsg.sys
/usr/share/mysql/russian
/usr/share/mysql/russian/errmsg.sys
/usr/share/mysql/serbian
/usr/share/mysql/serbian/errmsg.sys
/usr/share/mysql/slovak
/usr/share/mysql/slovak/errmsg.sys
/usr/share/mysql/spanish
/usr/share/mysql/spanish/errmsg.sys
/usr/share/mysql/swedish
/usr/share/mysql/swedish/errmsg.sys
/usr/share/mysql/systemd
/usr/share/mysql/systemd/mariadb.service
/usr/share/mysql/systemd/mariadb@.service
/usr/share/mysql/systemd/use_galera_new_cluster.conf
/usr/share/mysql/ukrainian
/usr/share/mysql/ukrainian/errmsg.sys
/usr/share/mysql/wsrep.cnf
/usr/share/mysql/wsrep_notify
启动服务和查看端口
[root@localhost ~]# systemctl enable --now mariadb
Created symlink from /etc/systemd/system/mysql.service to /usr/lib/systemd/system/mariadb.service.
Created symlink from /etc/systemd/system/mysqld.service to /usr/lib/systemd/system/mariadb.service.
Created symlink from /etc/systemd/system/multi-user.target.wants/mariadb.service to /usr/lib/systemd/system/mariadb.service.######################
[root@localhost ~]# ss -ntl
State      Recv-Q Send-Q   Local Address:Port                  Peer Address:Port              LISTEN     0      80                [::]:3306                          [::]:*                  
查看客户端包
[root@localhost ~]# which mysql
/usr/bin/mysql
[root@localhost ~]# rpm -qf /usr/bin/mysql
MariaDB-client-10.2.32-1.el7.centos.x86_64
连接数据库
# 默认没有密码
[root@localhost ~]# mysql -uroot -p
Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 8
Server version: 10.2.32-MariaDB MariaDB ServerCopyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.MariaDB [(none)]> exit
Bye############################################################################[root@localhost ~]# mysql
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 9
Server version: 10.2.32-MariaDB MariaDB ServerCopyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.MariaDB [(none)]> exit
Bye
Mariadb客户端相关命令
MariaDB [(none)]> \hGeneral information about MariaDB can be found at
http://mariadb.orgList of all MySQL commands:
Note that all text commands must be first on line and end with ';'
?         (\?) Synonym for `help'.
clear     (\c) Clear the current input statement.
connect   (\r) Reconnect to the server. Optional arguments are db and host.
delimiter (\d) Set statement delimiter.
edit      (\e) Edit command with $EDITOR.
ego       (\G) Send command to mysql server, display result vertically.
exit      (\q) Exit mysql. Same as quit.
go        (\g) Send command to mysql server.
help      (\h) Display this help.
nopager   (\n) Disable pager, print to stdout.
notee     (\t) Don't write into outfile.
pager     (\P) Set PAGER [to_pager]. Print the query results via PAGER.
print     (\p) Print current command.
prompt    (\R) Change your mysql prompt.
quit      (\q) Quit mysql.
rehash    (\#) Rebuild completion hash.
source    (\.) Execute an SQL script file. Takes a file name as an argument.
status    (\s) Get status information from the server.
system    (\!) Execute a system shell command.
tee       (\T) Set outfile [to_outfile]. Append everything into given outfile.
use       (\u) Use another database. Takes database name as argument.
charset   (\C) Switch to another charset. Might be needed for processing binlog with multi-byte charsets.
warnings  (\W) Show warnings after every statement.
nowarning (\w) Don't show warnings after every statement.For server side help, type 'help contents'
查看服务器信息
MariaDB [(none)]> \s
--------------
mysql  Ver 15.1 Distrib 10.2.32-MariaDB, for Linux (x86_64) using readline 5.1Connection id:        10
Current database:
# 账号名加@客户端主机地址
Current user:       root@localhost
SSL:            Not in use
Current pager:      stdout
Using outfile:      ''
Using delimiter:    ;
Server:         MariaDB
Server version:     10.2.32-MariaDB MariaDB Server
Protocol version:   10
Connection:     Localhost via UNIX socket
Server characterset:    latin1
Db     characterset:    latin1
Client characterset:    utf8
Conn.  characterset:    utf8
# 在同一台电脑上利用socket套接字文件进行通信
UNIX socket:        /var/lib/mysql/mysql.sock
Uptime:         5 min 55 secThreads: 7  Questions: 8  Slow queries: 0  Opens: 17  Flush tables: 1  Open tables: 11  Queries per second avg: 0.022
--------------
查看套接字文件/var/lib/mysql/mysql.sock
[root@localhost ~]# ll /var/lib/mysql/mysql.sock
srwxrwxrwx 1 mysql mysql 0 Jun 22 20:21 /var/lib/mysql/mysql.sock
# 在同一台主机中利用套接字文件,可以省去tcp协议的封装与解封装的过程
# 真正跨网络还是应该走tcp协议
实例 instance

多实例的数据库错开端口号,一般测试环境使用

查看数据库文件/var/lib/mysql
[root@localhost ~]# cd /var/lib/mysql/
[root@localhost mysql]# ls
aria_log.00000001  ibdata1      ibtmp1             mysql               tc.log
aria_log_control   ib_logfile0  localhost.pid      mysql.sock          test
ib_buffer_pool     ib_logfile1  multi-master.info  performance_schema
[root@localhost mysql]# cd mysql/
[root@localhost mysql]# ls
columns_priv.frm    help_category.MYD       plugin.MYD         tables_priv.MYI
columns_priv.MYD    help_category.MYI       plugin.MYI         table_stats.frm
columns_priv.MYI    help_keyword.frm        proc.frm           table_stats.MYD
column_stats.frm    help_keyword.MYD        proc.MYD           table_stats.MYI
column_stats.MYD    help_keyword.MYI        proc.MYI           time_zone.frm
column_stats.MYI    help_relation.frm       procs_priv.frm     time_zone_leap_second.frm
db.frm              help_relation.MYD       procs_priv.MYD     time_zone_leap_second.MYD
db.MYD              help_relation.MYI       procs_priv.MYI     time_zone_leap_second.MYI
db.MYI              help_topic.frm          proxies_priv.frm   time_zone.MYD
db.opt              help_topic.MYD          proxies_priv.MYD   time_zone.MYI
event.frm           help_topic.MYI          proxies_priv.MYI   time_zone_name.frm
event.MYD           host.frm                roles_mapping.frm  time_zone_name.MYD
event.MYI           host.MYD                roles_mapping.MYD  time_zone_name.MYI
func.frm            host.MYI                roles_mapping.MYI  time_zone_transition.frm
func.MYD            index_stats.frm         servers.frm        time_zone_transition.MYD
func.MYI            index_stats.MYD         servers.MYD        time_zone_transition.MYI
general_log.CSM     index_stats.MYI         servers.MYI        time_zone_transition_type.frm
general_log.CSV     innodb_index_stats.frm  slow_log.CSM       time_zone_transition_type.MYD
general_log.frm     innodb_index_stats.ibd  slow_log.CSV       time_zone_transition_type.MYI
gtid_slave_pos.frm  innodb_table_stats.frm  slow_log.frm       user.frm
gtid_slave_pos.ibd  innodb_table_stats.ibd  tables_priv.frm    user.MYD
help_category.frm   plugin.frm              tables_priv.MYD    user.MYI

同一个表有着不同的文件格式后缀,对应的是不同的数据库引擎

MYD——>MyISAM

查看服务器端数据库

# 服务器端的命令结束必须加分号;
MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |# 比较特殊,该表格不是磁盘中的数据库,而是在内存中数据库
| mysql              |
| performance_schema |
| test               |
+--------------------+
4 rows in set (0.00 sec)
指定访问数据库
# use 关键字命令可以不加分号;
MariaDB [(none)]> use mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -ADatabase changed
MariaDB [mysql]> 
查看表格
MariaDB [mysql]> show tables;
+---------------------------+
| Tables_in_mysql           |
+---------------------------+
| column_stats              |
| columns_priv              |
| db                        |
| event                     |
| func                      |
| general_log               |
| gtid_slave_pos            |
| help_category             |
| help_keyword              |
| help_relation             |
| help_topic                |
| host                      |
| index_stats               |
| innodb_index_stats        |
| innodb_table_stats        |
| plugin                    |
| proc                      |
| procs_priv                |
| proxies_priv              |
| roles_mapping             |
| servers                   |
| slow_log                  |
| table_stats               |
| tables_priv               |
| time_zone                 |
| time_zone_leap_second     |
| time_zone_name            |
| time_zone_transition      |
| time_zone_transition_type |
| user                      |
+---------------------------+
30 rows in set (0.00 sec)
# 这个数据库是mysql基于管理自身的表格
查看user表格
MariaDB [mysql]> desc user;
+------------------------+-----------------------------------+------+-----+----------+-------+
| Field                  | Type                              | Null | Key | Default  | Extra |
+------------------------+-----------------------------------+------+-----+----------+-------+
| Host                   | char(60)                          | NO   | PRI |          |       |
| User                   | char(80)                          | NO   | PRI |          |       |
| Password               | char(41)                          | NO   |     |          |       |
| Select_priv            | enum('N','Y')                     | NO   |     | N        |       |
| Insert_priv            | enum('N','Y')                     | NO   |     | N        |       |
| Update_priv            | enum('N','Y')                     | NO   |     | N        |       |
| Delete_priv            | enum('N','Y')                     | NO   |     | N        |       |
| Create_priv            | enum('N','Y')                     | NO   |     | N        |       |
| Drop_priv              | enum('N','Y')                     | NO   |     | N        |       |
| Reload_priv            | enum('N','Y')                     | NO   |     | N        |       |
| Shutdown_priv          | enum('N','Y')                     | NO   |     | N        |       |
| Process_priv           | enum('N','Y')                     | NO   |     | N        |       |
| File_priv              | enum('N','Y')                     | NO   |     | N        |       |
| Grant_priv             | enum('N','Y')                     | NO   |     | N        |       |
| References_priv        | enum('N','Y')                     | NO   |     | N        |       |
| Index_priv             | enum('N','Y')                     | NO   |     | N        |       |
| Alter_priv             | enum('N','Y')                     | NO   |     | N        |       |
| Show_db_priv           | enum('N','Y')                     | NO   |     | N        |       |
| Super_priv             | enum('N','Y')                     | NO   |     | N        |       |
| Create_tmp_table_priv  | enum('N','Y')                     | NO   |     | N        |       |
| Lock_tables_priv       | enum('N','Y')                     | NO   |     | N        |       |
| Execute_priv           | enum('N','Y')                     | NO   |     | N        |       |
| Repl_slave_priv        | enum('N','Y')                     | NO   |     | N        |       |
| Repl_client_priv       | enum('N','Y')                     | NO   |     | N        |       |
| Create_view_priv       | enum('N','Y')                     | NO   |     | N        |       |
| Show_view_priv         | enum('N','Y')                     | NO   |     | N        |       |
| Create_routine_priv    | enum('N','Y')                     | NO   |     | N        |       |
| Alter_routine_priv     | enum('N','Y')                     | NO   |     | N        |       |
| Create_user_priv       | enum('N','Y')                     | NO   |     | N        |       |
| Event_priv             | enum('N','Y')                     | NO   |     | N        |       |
| Trigger_priv           | enum('N','Y')                     | NO   |     | N        |       |
| Create_tablespace_priv | enum('N','Y')                     | NO   |     | N        |       |
| ssl_type               | enum('','ANY','X509','SPECIFIED') | NO   |     |          |       |
| ssl_cipher             | blob                              | NO   |     | NULL     |       |
| x509_issuer            | blob                              | NO   |     | NULL     |       |
| x509_subject           | blob                              | NO   |     | NULL     |       |
| max_questions          | int(11) unsigned                  | NO   |     | 0        |       |
| max_updates            | int(11) unsigned                  | NO   |     | 0        |       |
| max_connections        | int(11) unsigned                  | NO   |     | 0        |       |
| max_user_connections   | int(11)                           | NO   |     | 0        |       |
| plugin                 | char(64)                          | NO   |     |          |       |
| authentication_string  | text                              | NO   |     | NULL     |       |
| password_expired       | enum('N','Y')                     | NO   |     | N        |       |
| is_role                | enum('N','Y')                     | NO   |     | N        |       |
| default_role           | char(80)                          | NO   |     |          |       |
| max_statement_time     | decimal(12,6)                     | NO   |     | 0.000000 |       |
+-------------------

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