刷新權(quán)限，將某些權(quán)限從硬盤刷新到內(nèi)存中(修改root密碼自帶隱式刷新權(quán)限操作)

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

mysql>

查看服務(wù)端口

mysql> show variables like 'port';

+---------------+-------+

| Variable_name | Value |

+---------------+-------+

| port | 3306 |

+---------------+-------+

1 row in set (0.00 sec)

mysql>

查看數(shù)據(jù)庫字符集

mysql> show variables like '%char%';

+--------------------------+----------------------------------+

| Variable_name | Value |

+--------------------------+----------------------------------+

| character_set_client | utf8 |

| character_set_connection | utf8 |

| character_set_database | latin1 |

| character_set_filesystem | binary |

| character_set_results | utf8 |

| character_set_server | latin1 |

| character_set_system | utf8 |

| character_sets_dir | /usr/local/mysql/share/charsets/ |

+--------------------------+----------------------------------+

8 rows in set (0.01 sec)

切數(shù)據(jù)庫

mysql> select database();

+------------+

| database() |

+------------+

| test |

+------------+

1 row in set (0.01 sec)

mysql> show databases;

+--------------------+

| Database |

+--------------------+

| information_schema |

| mysql |

| performance_schema |

| sys |

+--------------------+

4 rows in set (0.00 sec)

mysql> use mysql

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with -A

Database changed

mysql> select database();

+------------+

| database() |

+------------+

| mysql |

+------------+

1 row in set (0.00 sec)

mysql> status

--------------

mysql Ver 14.14 Distrib 5.7.25, for linux-glibc2.12 (x86_64) using EditLine wrapper

Connection id: 6

Current database: mysql

Current user: root@localhost

SSL: Not in use

Current pager: stdout

Using outfile: ''

Using delimiter: ;

Server version: 5.7.25 MySQL Community Server (GPL)

Protocol version: 10

Connection: Localhost via UNIX socket

Server characterset: latin1

Db characterset: latin1

Client characterset: utf8

Conn. characterset: utf8

UNIX socket: /tmp/mysql.sock

Uptime: 2 days 16 hours 47 min 41 sec

Threads: 1 Questions: 58 Slow queries: 0 Opens: 138 Flush tables: 1 Open tables: 131 Queries per second avg: 0.000

--------------

mysql> show tables;

+---------------------------+

| Tables_in_mysql |

+---------------------------+

| columns_priv |

| db |

| engine_cost |

| event |

| func |

| general_log |

| gtid_executed |

| help_category |

| help_keyword |

| help_relation |

| help_topic |

| innodb_index_stats |

| innodb_table_stats |

| ndb_binlog_index |

| plugin |

| proc |

| procs_priv |

| proxies_priv |

| server_cost |

| servers |

| slave_master_info |

| slave_relay_log_info |

| slave_worker_info |

| slow_log |

| tables_priv |

| time_zone |

| time_zone_leap_second |

| time_zone_name |

| time_zone_transition |

| time_zone_transition_type |

| user |

+---------------------------+

31 rows in set (0.00 sec)

mysql>

創(chuàng)建允許遠(yuǎn)程登陸的用戶

mysql> select host,user from mysql.user;

+-----------+---------------+

| host | user |

+-----------+---------------+

| localhost | mysql.session |

| localhost | mysql.sys |

| localhost | root |

+-----------+---------------+

3 rows in set (0.00 sec)

mysql> grant all privileges on *.* to scott@'%' identified by 'tiger';

Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql>

data目錄中每個數(shù)據(jù)庫都創(chuàng)建了一個文件夾，lbdata1、ib_logfile0、ib_logfile1三個是專門為innodb存放數(shù)據(jù)和日志的共享文件

mysql> create database test;

Query OK, 1 row affected (0.01 sec)

mysql> use test;

Database changed

mysql> create table tmp(id int);

Query OK, 0 rows affected (0.03 sec)

mysql> desc tmp;

+-------+---------+------+-----+---------+-------+

| Field | Type | Null | Key | Default | Extra |

+-------+---------+------+-----+---------+-------+

| id | int(11) | YES | | NULL | |

+-------+---------+------+-----+---------+-------+

1 row in set (0.02 sec)

mysql> insert into tmp value ('2')

-> ;

Query OK, 1 row affected (0.01 sec)

mysql> commit;

Query OK, 0 rows affected (0.00 sec)

mysql> select * from tmp;

+------+

| id |

+------+

| 2 |

+------+

1 row in set (0.00 sec)

mysql> \q

Bye

[root@localhost /usr/local/mysql/data]$ ls

auto.cnf ib_buffer_pool ibdata1 ib_logfile0 ib_logfile1 ibtmp1 localhost.localdomain.err localhost.localdomain.pid mysql performance_schema sys test

[root@localhost /usr/local/mysql/data]$ cd test

[root@localhost /usr/local/mysql/data/test]$ ls

db.opt tmp.frm tmp.ibd

每個數(shù)據(jù)庫目錄中的db.opt是數(shù)據(jù)庫的信息,表名.frm是表的元信息,表名.ibd是數(shù)據(jù)信息,其中innodb_file_per_table參數(shù)來控制是否單獨(dú)存儲，5.7默認(rèn)on，之前版本默認(rèn)off

mysql> show variables like '%per_table%';

+-----------------------+-------+

| Variable_name | Value |

+-----------------------+-------+

| innodb_file_per_table | ON |

+-----------------------+-------+

1 row in set (0.01 sec)

mysql>

.myd .myi是老的MyISAM存儲引擎,myi是索引信息

mysql> create table tmp2(id int);

Query OK, 0 rows affected (0.02 sec)

mysql> show create table tmp;

+-------+-----------------------------------------------------------------------------------------+

| Table | Create Table |

+-------+-----------------------------------------------------------------------------------------+

| tmp | CREATE TABLE `tmp` (

`id` int(11) DEFAULT NULL

) ENGINE=InnoDB DEFAULT CHARSET=latin1 |

+-------+-----------------------------------------------------------------------------------------+

1 row in set (0.00 sec)

mysql>

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