DB2权限和特权-Mysql Tutorial-php.cn

Home

Database

Mysql Tutorial

DB2权限和特权

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

Jun 07, 2016 pm 03:01 PM

db2ExampledatabasePermissionslevel

数据库权限分为实例权限级别（SYSADM、SYSCTRL、SYSMAINT、SYSMON）和数据库权限级别（DBAMD、LOAD）。SYSCTRL、SYSMAINT、SYSMON权限级别的用户不能访问数据，DBAMD、LOAD权限级别的用户可以访问数据。特权是比权限更细力度的控制。数据库特权： CONNECT

数据库权限分为实例权限级别（SYSADM、SYSCTRL、SYSMAINT、SYSMON）和数据库权限级别（DBAMD、LOAD）。SYSCTRL、SYSMAINT、SYSMON权限级别的用户不能访问数据，DBAMD、LOAD权限级别的用户可以访问数据。

特权是比权限更细力度的控制。

数据库特权：
CONNECT －允许用户连接数据库
BINDADD －允许用户在数据库中创建新的包
CREATETAB －允许用户在数据库中创建新的表
CREATE_NOT_FENCED －允许用户注册定义为 NOT FENCED 的用户定义函数（UDF）或存储过程
IMPLICIT SCHEMA －允许用户在尚不存在的模式中创建对象（它自动地创建模式）*
QUIESCE_CONNECT －允许用户连接处于 quiesced 状态的数据库
CREATE_EXTERNAL_ROUTINE －允许用户注册外部例程（用 C 和 Java 等外部语言编写的例程）

表空间特权：
USE －允许用户在指定的表空间中创建表

模式特权：
CREATEIN －允许用户在模式中创建对象
ALTERIN －允许用户在模式中修改对象
DROPIN －允许用户从模式中删除对象

表/视图特权：
CONTROL －授予用户在表和视图上的所有特权，以及将这些特权（除了 CONTROL）授予别人
ALTER －允许用户在表中添加列、在表和它的列上添加或修改注释、添加主键或惟一约束以及创建或删除表检查约束
DELETE －允许用户从表或视图中删除行
INDEX －允许用户在表上创建索引
INSERT －允许用户在表或视图中插入数据
REFERENCES －允许用户创建和删除外键，这需要指定关系中的父表
SELECT －允许用户从表或视图中检索行、在表上创建视图以及运行 EXPORT 实用程序
UPDATE －允许用户修改表、视图或者表或视图中某些列中的数据；用户可以只在特定列上具有这种特权

索引特权：
CONTROL －允许用户删除索引

包特权：
CONTROL －允许用户重新绑定、删除或执行包，以及将这些特权（除了 CONTROL）授予别人
BIND －允许用户重新绑定现有的包
EXECUTE －允许用户执行包

例程特权：
EXECUTE 允许用户调用例程，从例程创建函数（只应用于函数），以及在任何 DDL 语句（比如 CREATE VIEW、CREATE TRIGGER 或定义约束时）中引用例程

序列特权：
USAGE －允许用户对序列使用 NEXTVAL 和 PREVVAL 表达式
ALTER －允许用户使用 ALTER SEQUENCE 语句修改序列属性

特权的信息存储在七个系统编目视图中：
* SYSCAT.DBAUTH - 数据库特权
* SYSCAT.COLAUTH - 表和视图列特权
* SYSCAT.INDEXAUTH - 索引特权
* SYSCAT.PACKAGEAUTH - 包特权
* SYSCAT.SCHEMAAUTH - 模式特权
* SYSCAT.TABAUTH - 表和视图特权
* SYSCAT.TBSPACEAUTH - 表空间特权

查看当前连接用户权限：
$ db2 get authorizations
Administrative Authorizations for Current User
Direct SYSADM authority = NO
Direct SYSCTRL authority = NO
Direct SYSMAINT authority = NO
Direct DBADM authority = YES
Direct CREATETAB authority = YES
Direct BINDADD authority = YES
Direct CONNECT authority = YES
Direct CREATE_NOT_FENC authority = YES
Direct IMPLICIT_SCHEMA authority = YES
Direct LOAD authority = YES
Direct QUIESCE_CONNECT authority = YES
Direct CREATE_EXTERNAL_ROUTINE authority = YES
Direct SYSMON authority = NO
Indirect SYSADM authority = YES
Indirect SYSCTRL authority = NO
Indirect SYSMAINT authority = NO
Indirect DBADM authority = NO
Indirect CREATETAB authority = NO
Indirect BINDADD authority = NO
Indirect CONNECT authority = NO
Indirect CREATE_NOT_FENC authority = NO
Indirect IMPLICIT_SCHEMA authority = NO
Indirect LOAD authority = NO
Indirect QUIESCE_CONNECT authority = NO
Indirect CREATE_EXTERNAL_ROUTINE authority = NO
Indirect SYSMON authority = NO
“直接” 权限意味着此权限是明确授予此用户的。“间接” 权限意味着此用户属于具有此权限的组。

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

How do you handle database upgrades in MySQL?Apr 30, 2025 am 12:28 AM

The steps for upgrading MySQL database include: 1. Backup the database, 2. Stop the current MySQL service, 3. Install the new version of MySQL, 4. Start the new version of MySQL service, 5. Recover the database. Compatibility issues are required during the upgrade process, and advanced tools such as PerconaToolkit can be used for testing and optimization.

What are the different backup strategies you can use for MySQL?Apr 30, 2025 am 12:28 AM

MySQL backup policies include logical backup, physical backup, incremental backup, replication-based backup, and cloud backup. 1. Logical backup uses mysqldump to export database structure and data, which is suitable for small databases and version migrations. 2. Physical backups are fast and comprehensive by copying data files, but require database consistency. 3. Incremental backup uses binary logging to record changes, which is suitable for large databases. 4. Replication-based backup reduces the impact on the production system by backing up from the server. 5. Cloud backups such as AmazonRDS provide automation solutions, but costs and control need to be considered. When selecting a policy, database size, downtime tolerance, recovery time, and recovery point goals should be considered.

What is MySQL clustering?Apr 30, 2025 am 12:28 AM

MySQLclusteringenhancesdatabaserobustnessandscalabilitybydistributingdataacrossmultiplenodes.ItusestheNDBenginefordatareplicationandfaulttolerance,ensuringhighavailability.Setupinvolvesconfiguringmanagement,data,andSQLnodes,withcarefulmonitoringandpe

How do you optimize database schema design for performance in MySQL?Apr 30, 2025 am 12:27 AM

Optimizing database schema design in MySQL can improve performance through the following steps: 1. Index optimization: Create indexes on common query columns, balancing the overhead of query and inserting updates. 2. Table structure optimization: Reduce data redundancy through normalization or anti-normalization and improve access efficiency. 3. Data type selection: Use appropriate data types, such as INT instead of VARCHAR, to reduce storage space. 4. Partitioning and sub-table: For large data volumes, use partitioning and sub-table to disperse data to improve query and maintenance efficiency.

How can you optimize MySQL performance?Apr 30, 2025 am 12:26 AM

TooptimizeMySQLperformance,followthesesteps:1)Implementproperindexingtospeedupqueries,2)UseEXPLAINtoanalyzeandoptimizequeryperformance,3)Adjustserverconfigurationsettingslikeinnodb_buffer_pool_sizeandmax_connections,4)Usepartitioningforlargetablestoi

How to use MySQL functions for data processing and calculationApr 29, 2025 pm 04:21 PM

MySQL functions can be used for data processing and calculation. 1. Basic usage includes string processing, date calculation and mathematical operations. 2. Advanced usage involves combining multiple functions to implement complex operations. 3. Performance optimization requires avoiding the use of functions in the WHERE clause and using GROUPBY and temporary tables.

An efficient way to batch insert data in MySQLApr 29, 2025 pm 04:18 PM

Efficient methods for batch inserting data in MySQL include: 1. Using INSERTINTO...VALUES syntax, 2. Using LOADDATAINFILE command, 3. Using transaction processing, 4. Adjust batch size, 5. Disable indexing, 6. Using INSERTIGNORE or INSERT...ONDUPLICATEKEYUPDATE, these methods can significantly improve database operation efficiency.

Steps to add and delete fields to MySQL tablesApr 29, 2025 pm 04:15 PM

In MySQL, add fields using ALTERTABLEtable_nameADDCOLUMNnew_columnVARCHAR(255)AFTERexisting_column, delete fields using ALTERTABLEtable_nameDROPCOLUMNcolumn_to_drop. When adding fields, you need to specify a location to optimize query performance and data structure; before deleting fields, you need to confirm that the operation is irreversible; modifying table structure using online DDL, backup data, test environment, and low-load time periods is performance optimization and best practice.

See all articles