--系统权限表select * from dba_sys_privs p where p.privilege like
--系统权限表
select * from dba_sys_privs p where p.privilege like '%LINK%'
--对象权限表
select * from dba_tab_privs tp where tp.owner='SCOTT'
--在网上看到的:
--- ALL_COL_PRIVS 表示列上的授权,用户和PUBLIC是被授予者
select * from dba_col_privs
ALL_COL_PRIVS_MADE 表示列上的授权,用户是属主和被授予者
select * from all_col_privs_made
ALL_COL_RECD 表示列上的授权,用户和PUBLIC是被授予者
ALL_TAB_PRIVS 表示对象上的授权,用户是PUBLIC或被授予者或用户是属主
ALL_TAB_PRIVS_MADE 表示对象上的权限,用户是属主或授予者
ALL_TAB_PRIVS_RECD 表示对象上的权限, 用户是PUBLIC或被授予者
DBA_COL_PRIVS 数据库列上的所有授权
DBA_ROLE_PRIVS 显示已授予用户或其他角色的角色
DBA_SYS_PRIVS 已授予用户或角色的系统权限
DBA_TAB_PRIVS 数据库对象上的所有权限
ROLE_ROLE_PRIVS 显示已授予用户的角色
select * from role_role_privs;--role_role_privs;指授预此角色的角色
--测试上述 --经测试role_role_privs是授预此角色的角色
create role zxy_role;
create role zxy_role_1;
grant zxy_role_1 to zxy_role;
ROLE_SYS_PRIVS 显示通过角色授予用户的系统权限
select * from role_sys_privs;--显示角色所属的系统权限
--测试
grant create table to zxy_role;
ROLE_TAB_PRIVS 显示通过角色授予用户的对象权限
select * from ROLE_TAB_PRIVS;--显示角色所属的对象权限
--测试
grant select on scott.emp to zxy_role;
SESSION_PRIVS 显示用户现在可利用的所有系统权限
select * from session_privs;--显示用户可以使用的系统权限
USER_COL_PRIVS 显示列上的权限,用户是属主、授予者或被授予者
select * from user_col_privs
USER_COL_PRIVS_MADE 显示列上已授予的权限,用户是属主或授予者
USER_COL_PRIVS_RECD 显示列上已授予的权限,用户是属主或被授予者
USER_ROLE_PRIVS 显示已授予给用户的所有角色
select * from dba_role_privs;--显示已经给用户授予的角色
--测试
grant zxy_role to scott;--显示给scott用户授予的角色
USER_SYS_PRIVS 显示已授予给用户的所有系统权限
USER_TAB_PRIVS 显示已授予给用户的所有对象权限
USER_TAB_PRIVS_MADE 显示已授予给其他用户的对象权限,用户是属主
select * from USER_TAB_PRIVS_MADE ma where ma.grantee='SCOTT';--显示授予者授予给被授予者的系统和对象权限
--测试
grant execute on SYS.BLASTN_MATCH to scott;--对象权限
grant select any table to scott;--系统权限 --经测无系统权限,,仅显示对象权限
USER_TAB_PRIVS_RECD 显示已授予给其他用户的对象权限,用户是被授予者'
select * from user_TAB_PRIVS_RECD m where table_name='T_ONLY';--显示
--测试
grant select on t_only to scott;

MySQL's position in databases and programming is very important. It is an open source relational database management system that is widely used in various application scenarios. 1) MySQL provides efficient data storage, organization and retrieval functions, supporting Web, mobile and enterprise-level systems. 2) It uses a client-server architecture, supports multiple storage engines and index optimization. 3) Basic usages include creating tables and inserting data, and advanced usages involve multi-table JOINs and complex queries. 4) Frequently asked questions such as SQL syntax errors and performance issues can be debugged through the EXPLAIN command and slow query log. 5) Performance optimization methods include rational use of indexes, optimized query and use of caches. Best practices include using transactions and PreparedStatemen

MySQL is suitable for small and large enterprises. 1) Small businesses can use MySQL for basic data management, such as storing customer information. 2) Large enterprises can use MySQL to process massive data and complex business logic to optimize query performance and transaction processing.

InnoDB effectively prevents phantom reading through Next-KeyLocking mechanism. 1) Next-KeyLocking combines row lock and gap lock to lock records and their gaps to prevent new records from being inserted. 2) In practical applications, by optimizing query and adjusting isolation levels, lock competition can be reduced and concurrency performance can be improved.

MySQL is not a programming language, but its query language SQL has the characteristics of a programming language: 1. SQL supports conditional judgment, loops and variable operations; 2. Through stored procedures, triggers and functions, users can perform complex logical operations in the database.

MySQL is an open source relational database management system, mainly used to store and retrieve data quickly and reliably. Its working principle includes client requests, query resolution, execution of queries and return results. Examples of usage include creating tables, inserting and querying data, and advanced features such as JOIN operations. Common errors involve SQL syntax, data types, and permissions, and optimization suggestions include the use of indexes, optimized queries, and partitioning of tables.

MySQL is an open source relational database management system suitable for data storage, management, query and security. 1. It supports a variety of operating systems and is widely used in Web applications and other fields. 2. Through the client-server architecture and different storage engines, MySQL processes data efficiently. 3. Basic usage includes creating databases and tables, inserting, querying and updating data. 4. Advanced usage involves complex queries and stored procedures. 5. Common errors can be debugged through the EXPLAIN statement. 6. Performance optimization includes the rational use of indexes and optimized query statements.

MySQL is chosen for its performance, reliability, ease of use, and community support. 1.MySQL provides efficient data storage and retrieval functions, supporting multiple data types and advanced query operations. 2. Adopt client-server architecture and multiple storage engines to support transaction and query optimization. 3. Easy to use, supports a variety of operating systems and programming languages. 4. Have strong community support and provide rich resources and solutions.

InnoDB's lock mechanisms include shared locks, exclusive locks, intention locks, record locks, gap locks and next key locks. 1. Shared lock allows transactions to read data without preventing other transactions from reading. 2. Exclusive lock prevents other transactions from reading and modifying data. 3. Intention lock optimizes lock efficiency. 4. Record lock lock index record. 5. Gap lock locks index recording gap. 6. The next key lock is a combination of record lock and gap lock to ensure data consistency.


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