|
|
|
|
The privilege tables are used by the MySQL Privilege System to authenticate a user connecting from a given host, and to associate that user with privileges on a database such as select, insert, update, and delete.
Additional functionality includes the ability to have an anonymous user and to grant privileges for MySQL-specific functions such as LOAD DATA INFILE and administrative operations.
The privilege tables are core to MySQL in order to perform the functions of it's privilege system. The privilege tables are created by running the script mysql_install_db and created in a special database called mysql.
The following is a brief overview of the privilege tables in the mysql database.
Show all databases created for this instance:
% mysqlshow +-------------+ | Databases | +-------------+ | bankaccount | | customer | | expenses | | mysql | | test | +-------------+Show all tables in the mysql database:
% mysqlshow -u root mysql Database: mysql +--------------+ | Tables | +--------------+ | columns_priv | | db | | func | | host | | tables_priv | | user | +--------------+Describe all Privilege Tables:
% desc user; +-----------------+-----------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-----------------+-----------------+------+-----+---------+-------+ | Host | char(60) binary | | PRI | | | | User | char(16) binary | | PRI | | | | Password | char(16) binary | | | | | | Select_priv | enum('N','Y') | | | N | | | Insert_priv | enum('N','Y') | | | N | | | Update_priv | enum('N','Y') | | | N | | | Delete_priv | enum('N','Y') | | | N | | | Create_priv | enum('N','Y') | | | N | | | Drop_priv | enum('N','Y') | | | N | | | Reload_priv | enum('N','Y') | | | N | | | Shutdown_priv | enum('N','Y') | | | N | | | Process_priv | enum('N','Y') | | | N | | | File_priv | enum('N','Y') | | | N | | | Grant_priv | enum('N','Y') | | | N | | | References_priv | enum('N','Y') | | | N | | | Index_priv | enum('N','Y') | | | N | | | Alter_priv | enum('N','Y') | | | N | | +-----------------+-----------------+------+-----+---------+-------+% desc db; +-----------------+-----------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-----------------+-----------------+------+-----+---------+-------+ | Host | char(60) binary | | PRI | | | | Db | char(64) binary | | PRI | | | | User | char(16) binary | | PRI | | | | Select_priv | enum('N','Y') | | | N | | | Insert_priv | enum('N','Y') | | | N | | | Update_priv | enum('N','Y') | | | N | | | Delete_priv | enum('N','Y') | | | N | | | Create_priv | enum('N','Y') | | | N | | | Drop_priv | enum('N','Y') | | | N | | | Grant_priv | enum('N','Y') | | | N | | | References_priv | enum('N','Y') | | | N | | | Index_priv | enum('N','Y') | | | N | | | Alter_priv | enum('N','Y') | | | N | | +-----------------+-----------------+------+-----+---------+-------+% desc host; +-----------------+-----------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-----------------+-----------------+------+-----+---------+-------+ | Host | char(60) binary | | PRI | | | | Db | char(64) binary | | PRI | | | | Select_priv | enum('N','Y') | | | N | | | Insert_priv | enum('N','Y') | | | N | | | Update_priv | enum('N','Y') | | | N | | | Delete_priv | enum('N','Y') | | | N | | | Create_priv | enum('N','Y') | | | N | | | Drop_priv | enum('N','Y') | | | N | | | Grant_priv | enum('N','Y') | | | N | | | References_priv | enum('N','Y') | | | N | | | Index_priv | enum('N','Y') | | | N | | | Alter_priv | enum('N','Y') | | | N | | +-----------------+-----------------+------+-----+---------+-------+% desc func; +-------+------------------------------+------+-----+----------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+------------------------------+------+-----+----------+-------+ | name | char(64) binary | | PRI | | | | ret | tinyint(1) | | | 0 | | | dl | char(128) | | | | | | type | enum('function','aggregate') | | | function | | +-------+------------------------------+------+-----+----------+-------+% desc tables_priv; +-------------+-----------------------------------------------------------------------------------------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------------+-----------------------------------------------------------------------------------------------+------+-----+---------+-------+ | Host | char(60) binary | | PRI | | | | Db | char(64) binary | | PRI | | | | User | char(16) binary | | PRI | | | | Table_name | char(60) binary | | PRI | | | | Grantor | char(77) | | MUL | | | | Timestamp | timestamp(14) | YES | | NULL | | | Table_priv | set('Select','Insert','Update','Delete','Create','Drop','Grant','References','Index','Alter') | | | | | | Column_priv | set('Select','Insert','Update','References') | | | | | +-------------+-----------------------------------------------------------------------------------------------+------+-----+---------+-------+% desc columns_priv; +-------------+----------------------------------------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------------+----------------------------------------------+------+-----+---------+-------+ | Host | char(60) binary | | PRI | | | | Db | char(64) binary | | PRI | | | | User | char(16) binary | | PRI | | | | Table_name | char(64) binary | | PRI | | | | Column_name | char(64) binary | | PRI | | | | Timestamp | timestamp(14) | YES | | NULL | | | Column_priv | set('Select','Insert','Update','References') | | | | | +-------------+----------------------------------------------+------+-----+---------+-------+
Jeffrey Hunter graduated from Stanislaus State University in Turlock, California, with a Bachelor's degree in Computer Science. Jeff is an Oracle Certified Professional, Java Development Certified Professional, Author, and currently works as a Senior Database Administrator for The DBA Zone, Inc.. His work includes advanced performance tuning, Java programming, capacity planning, database security, and physical / logical database design in a UNIX, Linux, and Windows NT environment. Jeff's other interests include mathematical encryption theory, programming language processors (compilers and interpreters) in Java and C, LDAP, writing web-based database administration tools, and of course Linux. Jeff has been a Sr. Database Administrator and Software Engineer for over 11 years and maintains his own website site at:
http://www.iDevelopment.info.
