columns_priv
列的权限信息
GRANT SELECT (col1), INSERT (col1,col2),UPDATE(col1, col2, col3), DELETE(col1,col2) ON mytest.test01 TO 'mytest'@'%';
component
服务器组件的注册表。 此表中列出的任何组件都由加载程序服务在服务器启动过程中安装。
db
系统DB信息（information_schema, sys）
default_roles
连接之后的默认role
engine_cost
contains estimates for operations specific to particular storage engines.
+-------------+-------------+------------------------+------------+---------------------+---------+---------------+
| engine_name | device_type | cost_name | cost_value | last_update | comment | default_value |
+-------------+-------------+------------------------+------------+---------------------+---------+---------------+
| default | 0 | io_block_read_cost | NULL | 2018-02-26 03:49:00 | NULL | 1 |
| default | 0 | memory_block_read_cost | NULL | 2018-02-26 03:49:00 | NULL | 0.25 |
+-------------+-------------+------------------------+------------+---------------------+---------+---------------+
2 rows in set (0.00 sec)
func
有关用户定义函数（UDF）的信息。
general_log
The general query log table.
global_grants
为用户分配动态全局特权
gtid_executed
storing GTID values
help_category
Information about help categories.
help_keyword
Keywords associated with help topics.
help_relation
Mappings between help keywords and topics.
help_topic
Help topic contents.
innodb_ddl_log
Stores DDL logs for crash-safe DDL operations.
innodb_dynamic_metadata
由InnoDB存储引擎用于存储快速更改的表元数据，例如自动递增计数器值和索引树损坏标志。 替换驻留在InnoDB系统表空间中的数据字典缓冲区表。
innodb_index_stats
innodb优化器统计信息。
innodb_table_stats
innodb优化器统计信息。
password_history
Information about password changes.
plugin
Information about server-side plugins
procs_priv
Stored procedure and function privileges.
proxies_priv
Proxy-user privileges.
role_edges
角色子图
server_cost
+------------------------------+------------+---------------------+---------+---------------+
| cost_name | cost_value | last_update | comment | default_value |
+------------------------------+------------+---------------------+---------+---------------+
| disk_temptable_create_cost | NULL | 2018-02-26 03:49:00 | NULL | 20 |
| disk_temptable_row_cost | NULL | 2018-02-26 03:49:00 | NULL | 0.5 |
| key_compare_cost | NULL | 2018-02-26 03:49:00 | NULL | 0.05 |
| memory_temptable_create_cost | NULL | 2018-02-26 03:49:00 | NULL | 1 |
| memory_temptable_row_cost | NULL | 2018-02-26 03:49:00 | NULL | 0.1 |
| row_evaluate_cost | NULL | 2018-02-26 03:49:00 | NULL | 0.1 |
+------------------------------+------------+---------------------+---------+---------------+
servers
Used by the FEDERATED storage engine.
slave_master_info
Used to store replication information on slave servers.
slave_relay_log_info
Used to store replication information on slave servers.
slave_worker_info
Used to store replication information on slave servers.
slow_log
The slow query log table.
tables_priv
表的权限信息
GRANT SELECT,UPDATE,DELETE,INSERT ON mytest.test01 to 'mytest'@'%';
time_zone
时区ID以及它们是否使用闰秒。
time_zone_leap_second
When leap seconds occur.
time_zone_name
Mappings between time zone IDs and names.
time_zone_transition
Time zone descriptions.
time_zone_transition_type
Time zone descriptions.
user
User accounts, global privileges, and other nonprivilege columns.
