Oracle 数据字典 说明
2016-01-13 08:43
771 查看
2012-03-21 21:41
392人阅读 评论(0)
收藏 举报
分类：
oracle相关（53）
作者同类文章X
目录(?)[+]
Contents of the Data Dictionary
Views with the Prefix DBA_
Views with the Prefix ALL_
Views with the Prefix USER_
The DUAL Table
一.官网上有关数据字典的信息
关于Oracle 的数据字典，官网的文档上有详细的说明，地址：
Data Dictionary and Dynamic Performance Views
http://download.oracle.com/docs/cd/E11882_01/server.112/e10713/datadict.htm#CNCPT2140
Overview of the Data Dictionary
An important part of an Oracle database is its
data dictionary, which is a read-only set of tables that provides administrative metadata about the database. A data dictionary contains information such as the following:
· The definitions of every
schema object in the database, including default values for columns and integrity constraint information
· The amount of space allocated for and currently used by the schema objects
· The names of Oracle Database users, privileges and roles granted to users, and
auditing information related to users (see
"User Accounts")
The data dictionary is a central part of data management for every Oracle database. For example, the database performs the following actions:
· Accesses the data dictionary to find information about users, schema objects, and storage structures
· Modifies the data dictionary every time that a
DDL statement is issued (see
"Data Definition Language (DDL) Statements")
Because Oracle Database stores data dictionary data in tables, just like other data, users can
query the data with SQL. For example, users can run
privileges, which tables exist in their schema, which columns are in these tables, whether indexes
are built on these columns, and so on.
· Base tables
These underlying tables store information about the database. Only Oracle Database should write to and read these tables. Users rarely access the base tables directly because they are normalized and most data is stored in a cryptic format.
· Views
These views decode the base table data into useful information, such as user or table names, using
joins and
administrators only.
Typically, data dictionary views are grouped in sets. In many cases, a set consists of three views containing similar information and distinguished from each other by their prefixes, as shown in
Table 6-1. By querying the appropriate views, you can access only the information relevant for you.
Data Dictionary View Sets
Not all views sets have three members. For example, the data dictionary contains a
The system-supplied
SQL> SELECT * FROM DICTIONARY ORDER BY TABLE_NAME;
TABLE_NAME COMMENTS
------------------------------ ----------------------------------------
ALL_ALL_TABLES Description of all object and relational
tables accessible to the user
ALL_APPLY Details about each apply process that
dequeues from the queue visible to the
current user
For example, the following query shows information about all objects in the database:
owns.
For example, the following query returns information about all the objects to which you have access:
Because the
Application developers should be cognizant of the effect of roles when using
where roles are not enabled by default.
· Refer to the user's private environment in the database, including metadata about schema objects created by the user, grants made by the user, and so on
· Display only rows pertinent to the user, returning a subset of the information in the
· Has columns identical to the other views, except that the column
· Can have abbreviated
For example, the following query returns all the objects contained in your schema:
and user-written programs can reference to guarantee a known result. The dual table is useful when a value must be returned only once, for example, the current date and time. All database users have access to
The
SQL> SELECT ((3*4)+5)/3 FROM DUAL;
((3*4)+5)/3
-----------
5.66666667
Oracle Dual 表详解
http://blog.csdn.net/tianlesoftware/archive/2009/11/04/4764326.aspx
二．数据字典
Oracle数据字典是有表和视图组成，存储有关数据库结构信息的一些数据库对象。数据库字典描述了实际数据是如何组织的。比如一个表的创建者信息，创建时间信息，所属表空间信息，用户访问权限信息等。对它们可以象处理其他数据库表或视图一样进行查询，但不能进行任何修改。它们存放在SYSTEM表空间中，当用户在对数据库中的数据进行操作时遇到困难就可以访问数据字典来查看详细的信息。用户可以用SQL语句访问数据库数据字典。
Oracle数据库字典通常是在创建和安装数据库时被创建的，Oracle数据字典是Oracle数据库系统工作的基础，没有数据字典的支持，Oracle数据库系统就不能进行任何工作。数据字典中的表是不能直接被访问的，但是可以访问数据字典中的视图。
2.1 数据字典内容包括：
1,数据库中所有模式对象的信息，如表、视图、簇、及索引等。
2,分配多少空间，当前使用了多少空间等。
3,列的缺省值。
4,约束信息的完整性。
5,Oracle用户的名字。
6,用户及角色被授予的权限。
7,用户访问或使用的审计信息。
8,其它产生的数据库信息。
2.2 数据字典分为数据字典表和数据字典视图
2.2. 1 数据字典表
数据字典表里的数据是Oracle系统存放的系统数据，而普通表存放的是用户的数据。为了方便的区别这些表，这些表的名字都是用"$"结尾，这些表属于SYS用户。
数据字典表由$ORACLE_HOME/rdbms/admin/sql.bsq 脚本创建， 这个脚本里又调用了其他的脚本来创建这些数据字典表。 在那些创建脚本里有基表的创建SQL。 感兴趣的自己打开看看。
Oracle 对数据字典表的说明：
These underlying tables store information about the database.
Only Oracle Database should write to and read these tables. Users rarely access the base tables directly because they are normalized and most data is stored in a cryptic format.
这些数据字典表，只有Oracle 能够进行读写。
SYS用户下的这些数据字典表，存放在system 表空间下面，表名都用"$"结尾，为了便于用户对数据字典表的查询， Oracle对这些数据字典都分别建立了用户视图，这样即容易记住，还隐藏了数据字典表表之间的关系，Oracle针对这些对象的范围，分别把视图命名为DBA_XXXX, ALL_XXXX和USER_XXXX。
关于这3类视图，下面有介绍。
Oracle为了便于汇总数据字典表的信息，把所有的数据字典都汇集到dictionary表里了，通过对这个表的查询，我们可以很方便的找到数据库提供的数据字典。
2.2.2 数据字典视图
动态性能视图由脚本：$ORACLE_HOME/rdbms/admin/catalog.sql 创建， 该脚本也只是一个总的调用，在该脚本里由调用了其他的脚本。 感兴趣的可以自己打开看一下，在那些脚本里，可以看到视图的创建SQL.
这是因为这个脚本会创建动态视图，所以在做DB 升级的时候，也需要执行这个脚本，重新创建视图。
数据字典视图分2类：静态数据字典（静态性能视图） 和 动态数据字典（动态性能视图）
2.2.2.1 静态数据字典（静态性能视图）
静态数据字典中的视图分为三类，它们分别由三个前缀够成：user_*、 all_*、 dba_*。
user_*：该视图存储了关于当前用户所拥有的对象的信息。（即所有在该用户模式下的对象）
all_*：该试图存储了当前用户能够访问的对象的信息, 而不是当前用户拥有的对象。（与user_*相比，all_* 并不需要拥有该对象，只需要具有访问该对象的权限即可）
dba_*：该视图存储了数据库中所有对象的信息。（前提是当前用户具有访问这些数据库的权限，一般来说必须具有管理员权限）
这些视图由SYS用户创建的，所以使用需要加上SYS,为了方便， Oracle为每个数据字典表的视图头建立了同名字的公共同义词(public synonyms). 这样简单的处理就省去了写sys.的麻烦。
示例：
（1）user_tables：主要描述当前用户拥有的所有表的信息，主要包括表名、表空间名、簇名等。通过此视图可以清楚了解当前用户可以操作的表有哪些。
SQL>select * from user_tables;
（2）user_indexes： 查询该用户拥有哪些索引。
SQL>select index_name from user_indexes;
（3）user_views： 查询该用户拥有哪些视图
SQL>select view_name from user_views;
（4）user_objects：查询该用户拥有哪些数据库对象,对象包括表、视图、存储过程、触发器、包、索引、序列、JAVA文件等。
SQL>select object_name from user_objects;
（5）user_users：主要描述当前用户的信息，主要包括当前用户名、帐户id、帐户状态、表空间名、创建时间等。
SQL>select * from user_users;
（6）all_objects：查询某一用户下的所有表、过程、函数等信息。
SQL>select owner , object_name ,object_type from all_objects
2.2.2.2 动态数据字典（动态性能视图）
除了静态数据字典中三类视图，其他的字典视图中主要的是V$视图，之所以这样叫是因为他们都是以V$或GV$开头的。这些视图会不断的进行更新，从而提供了关于内存和磁盘的运行情况，所以我们只能对其进行只读访问而不能修改它们。
Throughout its operation, Oracle Database maintains a set of virtual tables that record current database activity. These
views are calleddynamic performance views because
they are continuously updated while a database is open and in use. The views, also sometimes called
V$ views。
V$视图是基于X$虚拟视图的。V$视图是SYS用户所拥有的，在缺省状况下，只有SYS用户和拥有DBA系统权限的用户可以看到所有的视图，没有DBA权限的用户可以看到USER_和ALL_视图，但不能看到DBA_视图。与DBA_,ALL,和USER_视图中面向数据库信息相反，这些视图可视的给出了面向实例的信息。
动态性能表用于记录当前数据库的活动，只存于数据库运行期间，实际的信息都取自内存和控制文件。 DBA可以使用动态视图来监视和调节数据。
关于动态性能视图，参考：
Oracle 动态性能视图
http://blog.csdn.net/tianlesoftware/archive/2010/09/04/5863191.aspx
2.3 视图家族
在Oracle的绝大多数数据字典视图中都有象DBA_TABLES,ALL_TABLES和USER_TABLES这样的视图家族。Oracle中有超过100个视图家族，下表列出了最重要和最常用的视图家族，需要注意的是每个视图家族都有一个DBA_,一个ALL_
和一个USER_视图。
在Oracle中还有一些不常用的数据字典表，但这些表不是真正的字典家族，他们都是一些重要的单一的视图。这些视图见下表:
2.4 查看数据字典
我们通过dictionary 字典来查看所有的视图和其描述。 该表只有2个字段：表名和描述
SQL> desc dictionary
名称 是否为空? 类型
----------------------------------------- -------- -------------------------
TABLE_NAME VARCHAR2(30)
COMMENTS VARCHAR2(4000)
我们可以用以下SQL来查看所有数据字典对象：
SQL>select * from dictionary;
Oracle 11g中有2592个对象。
SQL> select count(*) from dictionary;
COUNT(*)
----------
2592
部分数据如下表：
392人阅读 评论(0)
收藏 举报
分类：
oracle相关（53）
作者同类文章X
目录(?)[+]
Contents of the Data Dictionary
Views with the Prefix DBA_
Views with the Prefix ALL_
Views with the Prefix USER_
The DUAL Table
一.官网上有关数据字典的信息
关于Oracle 的数据字典，官网的文档上有详细的说明，地址：
Data Dictionary and Dynamic Performance Views
http://download.oracle.com/docs/cd/E11882_01/server.112/e10713/datadict.htm#CNCPT2140
Overview of the Data Dictionary
An important part of an Oracle database is its
data dictionary, which is a read-only set of tables that provides administrative metadata about the database. A data dictionary contains information such as the following:
· The definitions of every
schema object in the database, including default values for columns and integrity constraint information
· The amount of space allocated for and currently used by the schema objects
· The names of Oracle Database users, privileges and roles granted to users, and
auditing information related to users (see
"User Accounts")
The data dictionary is a central part of data management for every Oracle database. For example, the database performs the following actions:
· Accesses the data dictionary to find information about users, schema objects, and storage structures
· Modifies the data dictionary every time that a
DDL statement is issued (see
"Data Definition Language (DDL) Statements")
Because Oracle Database stores data dictionary data in tables, just like other data, users can
query the data with SQL. For example, users can run
SELECTstatements to determine their
privileges, which tables exist in their schema, which columns are in these tables, whether indexes
are built on these columns, and so on.
Contents of the Data Dictionary
The data dictionary consists of the following types of objects:· Base tables
These underlying tables store information about the database. Only Oracle Database should write to and read these tables. Users rarely access the base tables directly because they are normalized and most data is stored in a cryptic format.
· Views
These views decode the base table data into useful information, such as user or table names, using
joins and
WHEREclauses to simplify the information. These views contain the names and description of all objects in the data dictionary. Some views are accessible to all database users, whereas others are intended for
administrators only.
Typically, data dictionary views are grouped in sets. In many cases, a set consists of three views containing similar information and distinguished from each other by their prefixes, as shown in
Table 6-1. By querying the appropriate views, you can access only the information relevant for you.
Data Dictionary View Sets
| Prefix | User Access | Contents | Notes |
DBA_ | Database administrators | All objects | Some DBA_views have additional columns containing information useful to the administrator. |
ALL_ | All users | Objects to which user has privileges | Includes objects owned by user. These views obey the current set of enabled roles. |
USER_ | All users | Objects owned by user | Views with the prefix USER_usually exclude the column OWNER. This column is implied in the USER_views to be the user issuing the query. |
DBA_LOCKview but no
ALL_LOCKview.
The system-supplied
DICTIONARYview contains the names and abbreviated descriptions of all data dictionary views. The following query of this view includes partial sample output:
SQL> SELECT * FROM DICTIONARY ORDER BY TABLE_NAME;
TABLE_NAME COMMENTS
------------------------------ ----------------------------------------
ALL_ALL_TABLES Description of all object and relational
tables accessible to the user
ALL_APPLY Details about each apply process that
dequeues from the queue visible to the
current user
Views with the Prefix DBA_
Views with the prefixDBA_show all relevant information in the entire database.
DBA_views are intended only for administrators.
For example, the following query shows information about all objects in the database:
SELECT OWNER, OBJECT_NAME, OBJECT_TYPE FROM DBA_OBJECTS ORDER BY OWNER, OBJECT_NAME;
Views with the Prefix ALL_
Views with the prefixALL_refer to the user's overall perspective of the database. These views return information about schema objects to which the user has access through public or explicit grants of privileges and roles, in addition to schema objects that the user
owns.
For example, the following query returns information about all the objects to which you have access:
SELECT OWNER, OBJECT_NAME, OBJECT_TYPE FROM ALL_OBJECTS ORDER BY OWNER, OBJECT_NAME;
Because the
ALL_views obey the current set of enabled roles, query results depend on which roles are enabled, as shown in the following example:
SQL> SET ROLE ALL;
Role set.
SQL> SELECT COUNT(*) FROM ALL_OBJECTS;
COUNT(*)
----------
68295
SQL> SET ROLE NONE;
Role set.
SQL> SELECT COUNT(*) FROM ALL_OBJECTS;
COUNT(*)
----------
53771
Application developers should be cognizant of the effect of roles when using
ALL_views in a stored procedure,
where roles are not enabled by default.
Views with the Prefix USER_
The views most likely to be of interest to typical database users are those with the prefixUSER_. These views:
· Refer to the user's private environment in the database, including metadata about schema objects created by the user, grants made by the user, and so on
· Display only rows pertinent to the user, returning a subset of the information in the
ALL_views
· Has columns identical to the other views, except that the column
OWNERis implied
· Can have abbreviated
PUBLICsynonyms for convenience
For example, the following query returns all the objects contained in your schema:
SELECT OBJECT_NAME, OBJECT_TYPE FROM USER_OBJECTS ORDER BY OBJECT_NAME;
The DUAL Table
DUALis a small table in the data dictionary that Oracle Database
and user-written programs can reference to guarantee a known result. The dual table is useful when a value must be returned only once, for example, the current date and time. All database users have access to
DUAL.
The
DUALtable has one column called
DUMMYand one row containing the value
X. The following example queries
DUALto perform an arithmetical operation:
SQL> SELECT ((3*4)+5)/3 FROM DUAL;
((3*4)+5)/3
-----------
5.66666667
Oracle Dual 表详解
http://blog.csdn.net/tianlesoftware/archive/2009/11/04/4764326.aspx
二．数据字典
Oracle数据字典是有表和视图组成，存储有关数据库结构信息的一些数据库对象。数据库字典描述了实际数据是如何组织的。比如一个表的创建者信息，创建时间信息，所属表空间信息，用户访问权限信息等。对它们可以象处理其他数据库表或视图一样进行查询，但不能进行任何修改。它们存放在SYSTEM表空间中，当用户在对数据库中的数据进行操作时遇到困难就可以访问数据字典来查看详细的信息。用户可以用SQL语句访问数据库数据字典。
Oracle数据库字典通常是在创建和安装数据库时被创建的，Oracle数据字典是Oracle数据库系统工作的基础，没有数据字典的支持，Oracle数据库系统就不能进行任何工作。数据字典中的表是不能直接被访问的，但是可以访问数据字典中的视图。
2.1 数据字典内容包括：
1,数据库中所有模式对象的信息，如表、视图、簇、及索引等。
2,分配多少空间，当前使用了多少空间等。
3,列的缺省值。
4,约束信息的完整性。
5,Oracle用户的名字。
6,用户及角色被授予的权限。
7,用户访问或使用的审计信息。
8,其它产生的数据库信息。
2.2 数据字典分为数据字典表和数据字典视图
2.2. 1 数据字典表
数据字典表里的数据是Oracle系统存放的系统数据，而普通表存放的是用户的数据。为了方便的区别这些表，这些表的名字都是用"$"结尾，这些表属于SYS用户。
数据字典表由$ORACLE_HOME/rdbms/admin/sql.bsq 脚本创建， 这个脚本里又调用了其他的脚本来创建这些数据字典表。 在那些创建脚本里有基表的创建SQL。 感兴趣的自己打开看看。
Oracle 对数据字典表的说明：
These underlying tables store information about the database.
Only Oracle Database should write to and read these tables. Users rarely access the base tables directly because they are normalized and most data is stored in a cryptic format.
这些数据字典表，只有Oracle 能够进行读写。
SYS用户下的这些数据字典表，存放在system 表空间下面，表名都用"$"结尾，为了便于用户对数据字典表的查询， Oracle对这些数据字典都分别建立了用户视图，这样即容易记住，还隐藏了数据字典表表之间的关系，Oracle针对这些对象的范围，分别把视图命名为DBA_XXXX, ALL_XXXX和USER_XXXX。
关于这3类视图，下面有介绍。
Oracle为了便于汇总数据字典表的信息，把所有的数据字典都汇集到dictionary表里了，通过对这个表的查询，我们可以很方便的找到数据库提供的数据字典。
2.2.2 数据字典视图
动态性能视图由脚本：$ORACLE_HOME/rdbms/admin/catalog.sql 创建， 该脚本也只是一个总的调用，在该脚本里由调用了其他的脚本。 感兴趣的可以自己打开看一下，在那些脚本里，可以看到视图的创建SQL.
这是因为这个脚本会创建动态视图，所以在做DB 升级的时候，也需要执行这个脚本，重新创建视图。
数据字典视图分2类：静态数据字典（静态性能视图） 和 动态数据字典（动态性能视图）
2.2.2.1 静态数据字典（静态性能视图）
静态数据字典中的视图分为三类，它们分别由三个前缀够成：user_*、 all_*、 dba_*。
user_*：该视图存储了关于当前用户所拥有的对象的信息。（即所有在该用户模式下的对象）
all_*：该试图存储了当前用户能够访问的对象的信息, 而不是当前用户拥有的对象。（与user_*相比，all_* 并不需要拥有该对象，只需要具有访问该对象的权限即可）
dba_*：该视图存储了数据库中所有对象的信息。（前提是当前用户具有访问这些数据库的权限，一般来说必须具有管理员权限）
这些视图由SYS用户创建的，所以使用需要加上SYS,为了方便， Oracle为每个数据字典表的视图头建立了同名字的公共同义词(public synonyms). 这样简单的处理就省去了写sys.的麻烦。
示例：
（1）user_tables：主要描述当前用户拥有的所有表的信息，主要包括表名、表空间名、簇名等。通过此视图可以清楚了解当前用户可以操作的表有哪些。
SQL>select * from user_tables;
（2）user_indexes： 查询该用户拥有哪些索引。
SQL>select index_name from user_indexes;
（3）user_views： 查询该用户拥有哪些视图
SQL>select view_name from user_views;
（4）user_objects：查询该用户拥有哪些数据库对象,对象包括表、视图、存储过程、触发器、包、索引、序列、JAVA文件等。
SQL>select object_name from user_objects;
（5）user_users：主要描述当前用户的信息，主要包括当前用户名、帐户id、帐户状态、表空间名、创建时间等。
SQL>select * from user_users;
（6）all_objects：查询某一用户下的所有表、过程、函数等信息。
SQL>select owner , object_name ,object_type from all_objects
2.2.2.2 动态数据字典（动态性能视图）
除了静态数据字典中三类视图，其他的字典视图中主要的是V$视图，之所以这样叫是因为他们都是以V$或GV$开头的。这些视图会不断的进行更新，从而提供了关于内存和磁盘的运行情况，所以我们只能对其进行只读访问而不能修改它们。
Throughout its operation, Oracle Database maintains a set of virtual tables that record current database activity. These
views are calleddynamic performance views because
they are continuously updated while a database is open and in use. The views, also sometimes called
V$ views。
V$视图是基于X$虚拟视图的。V$视图是SYS用户所拥有的，在缺省状况下，只有SYS用户和拥有DBA系统权限的用户可以看到所有的视图，没有DBA权限的用户可以看到USER_和ALL_视图，但不能看到DBA_视图。与DBA_,ALL,和USER_视图中面向数据库信息相反，这些视图可视的给出了面向实例的信息。
动态性能表用于记录当前数据库的活动，只存于数据库运行期间，实际的信息都取自内存和控制文件。 DBA可以使用动态视图来监视和调节数据。
关于动态性能视图，参考：
Oracle 动态性能视图
http://blog.csdn.net/tianlesoftware/archive/2010/09/04/5863191.aspx
2.3 视图家族
在Oracle的绝大多数数据字典视图中都有象DBA_TABLES,ALL_TABLES和USER_TABLES这样的视图家族。Oracle中有超过100个视图家族，下表列出了最重要和最常用的视图家族，需要注意的是每个视图家族都有一个DBA_,一个ALL_
和一个USER_视图。
| 视图家族 | 描述 |
| COL_PRIVS | 包含了表的列权限，包括授予者、被授予者和权限 |
| EXTENTS | 数据范围信息，比如数据文件，数据段名(segment_name)和大小 |
| INDEXES | 索引信息，比如类型、唯一性和被涉及的表 |
| IND_COLUMNS | 索引列信息，比如索引上的列的排序方式 |
| OBJECTS | 对象信息，比如状态和DDL time |
| ROLE_PRIVS | 角色权限，比如GRANT和ADMIN选项 |
| SEGMENTS | 表和索引的数据段信息，比如tablespace和storage |
| SEQUECNCES | 序列信息，比如序列的cache、cycle和ast_number |
| SOURCE | 除触发器之外的所有内置过程、函数、包的源代码 |
| SYNONYMS | 别名信息，比如引用的对象和数据库链接db_link |
| SYS_PRIVS | 系统权限，比如grantee、privilege、admin选项 |
| TAB_COLUMNS | 表和视图的列信息，包括列的数据类型 |
| TAB_PRIVS | 表权限，比如授予者、被授予者和权限 |
| TABLES | 表信息，比如表空间(tablespace),存储参数(storage parms)和数据行的数量 |
| TRIGGERS | 触发器信息，比如类型、事件、触发体(trigger body) |
| USERS | 用户信息，比如临时的和缺省的表空间 |
| VIEWS | 视图信息，包括视图定义 |
| 视图名称 | 描述 |
| USER_COL_PRIVS_MADE | 用户授予他人的列权限 |
| USER_COL_PRIVS_RECD | 用户获得的列权限 |
| USER_TAB_PRIVS_MADE | 用户授予他人的表权限 |
| USER_TAB_PRIVS_RECD | 用户获得的表权限 |
我们通过dictionary 字典来查看所有的视图和其描述。 该表只有2个字段：表名和描述
SQL> desc dictionary
名称 是否为空? 类型
----------------------------------------- -------- -------------------------
TABLE_NAME VARCHAR2(30)
COMMENTS VARCHAR2(4000)
我们可以用以下SQL来查看所有数据字典对象：
SQL>select * from dictionary;
Oracle 11g中有2592个对象。
SQL> select count(*) from dictionary;
COUNT(*)
----------
2592
部分数据如下表：
| 视图名 | 描述 |
| ALL_CATALOG | All tables, views, synonyms, sequences accessible to the user |
| ALL_COL_COMMENTS | Comments on columns of accessible tables and views |
| ALL_COL_GRANTS_MADE | Grants on columns for which the user is owner or grantor |
| ALL_COL_GRANTS_RECD | Grants on columns for which the user or PUBLIC is the grantee |
| ALL_COL_PRIVS | Grants on columns for which the user is the grantor, grantee, owner, or an enabled role or PUBLIC is the grantee |
| ALL_COL_PRIVS_MADE | Grants on columns for which the user is owner or grantor |
| ALL_COL_PRIVS_RECD | Grants on columns for which the user, PUBLIC or enabled role is the grantee |
| ALL_CONSTRAINTS | Constraint definitions on accessible tables |
| ALL_CONS_COLUMNS | Information about accessible columns in constraint definitions |
| ALL_DB_LINKS | Database links accessible to the user |
| ALL_DEF_AUDIT_OPTS | Auditing options for newly created objects |
| ALL_DEPENDENCIES | Dependencies to and from objects accessible to the user |
| ALL_ERRORS | Current errors on stored objects that user is allowed to create |
| ALL_INDEXES | Descriptions of indexes on tables accessible to the user |
| ALL_IND_COLUMNS | COLUMNs comprising INDEXes on accessible TABLES |
| ALL_OBJECTS | Objects accessible to the user |
| ALL_REFRESH | All the refresh groups that the user can touch |
| ALL_REFRESH_CHILDREN | All the objects in refresh groups, where the user can touch the group |
| ALL_SEQUENCES | Description of SEQUENCEs accessible to the user |
| ALL_SNAPSHOTS | Snapshots the user can look at |
| ALL_SOURCE | Current source on stored objects that user is allowed to create |
| ALL_SYNONYMS | All synonyms accessible to the user |
| ALL_TABLES | Description of tables accessible to the user |
| ALL_TAB_COLUMNS | Columns of all tables, views and clusters |
| ALL_TAB_COMMENTS | Comments on tables and views accessible to the user |
| ALL_TAB_GRANTS_MADE | User's grants and grants on user's objects |
| ALL_TAB_GRANTS_RECD | Grants on objects for which the user or PUBLIC is the grantee |
| ALL_TAB_PRIVS | Grants on objects for which the user is the grantor, grantee, owner, or an enabled role or PUBLIC is the grantee |
| ALL_TAB_PRIVS_MADE | User's grants and grants on user's objects |
| ALL_TAB_PRIVS_RECD | Grants on objects for which the user, PUBLIC or enabled role is the grantee |
| ALL_TRIGGERS | Triggers accessible to the current user |
| ALL_TRIGGER_COLS | Column usage in user's triggers or in triggers on user's tables |
| ALL_USERS | Information about all users of the database |
| ALL_VIEWS | Text of views accessible to the user |
| USER_AUDIT_CONNECT | Audit trail entries for user logons/logoffs |
| USER_AUDIT_OBJECT | Audit trail records for statements concerning objects, specifically: table, cluster, view, index, sequence, [public] database link, [public] synonym, procedure, trigger, rollback segment, tablespace, role, user |
| USER_AUDIT_SESSION | |
| USER_AUDIT_STATEMENT | Audit trail records concerning grant, revoke, audit, noaudit and alter system |
| USER_AUDIT_TRAIL | Audit trail entries relevant to the user |
| USER_CATALOG | Tables, Views, Synonyms and Sequences owned by the user |
| USER_CLUSTERS | Descriptions of user's own clusters |
| USER_CLU_COLUMNS | Mapping of table columns to cluster columns |
| USER_COL_COMMENTS | Comments on columns of user's tables and views |
| USER_COL_GRANTS | Grants on columns for which the user is the owner, grantor or grantee |
| USER_COL_GRANTS_MADE | All grants on columns of objects owned by the user |
| USER_COL_GRANTS_RECD | Grants on columns for which the user is the grantee |
| USER_COL_PRIVS | Grants on columns for which the user is the owner, grantor or grantee |
| USER_COL_PRIVS_MADE | All grants on columns of objects owned by the user |
| USER_COL_PRIVS_RECD | Grants on columns for which the user is the grantee |
| USER_CONSTRAINTS | Constraint definitions on user's own tables |
| USER_CONS_COLUMNS | Information about accessible columns in constraint definitions |
| USER_CROSS_REFS | Cross references for user's views and synonyms |
| USER_DB_LINKS | Database links owned by the user |
| USER_DEPENDENCIES | Dependencies to and from a users objects |
| USER_ERRORS | Current errors on stored objects owned by the user |
| USER_EXTENTS | Extents comprising segments owned by the user |
| USER_FREE_SPACE | Free extents in tablespaces accessible to the user |
| USER_INDEXES | Description of the user's own indexes |
| USER_IND_COLUMNS | COLUMNs comprising user's INDEXes or on user's TABLES |
| USER_JOBS | All jobs owned by this user |
| USER_OBJECTS | Objects owned by the user |
| USER_OBJECT_SIZE | Sizes, in bytes, of various pl/sql objects |
| USER_OBJ_AUDIT_OPTS | Auditing options for user's own tables and views |
| USER_REFRESH | All the refresh groups |
| USER_REFRESH_CHILDREN | All the objects in refresh groups, where the user owns the refresh group |
| USER_RESOURCE_LIMITS | Display resource limit of the user |
| USER_ROLE_PRIVS | Roles granted to current user |
| USER_SEGMENTS | Storage allocated for all database segments |
| USER_SEQUENCES | Description of the user's own SEQUENCEs |
| USER_SNAPSHOTS | Snapshots the user can look at |
| USER_SNAPSHOT_LOGS | All snapshot logs owned by the user |
| USER_SOURCE | Source of stored objects accessible to the user |
| USER_SYNONYMS | The user's private synonyms |
| USER_SYS_PRIVS | System privileges granted to current user |
| USER_TABLES | Description of the user's own tables |
| USER_TABLESPACES | Description of accessible tablespaces |
| USER_TAB_AUDIT_OPTS | Auditing options for user's own tables and views |
| USER_TAB_COLUMNS | Columns of user's tables, views and clusters |
| USER_TAB_COMMENTS | Comments on the tables and views owned by the user |
| USER_TAB_GRANTS | Grants on objects for which the user is the owner, grantor or grantee |
| USER_TAB_GRANTS_MADE | All grants on objects owned by the user |
| USER_TAB_GRANTS_RECD | Grants on objects for which the user is the grantee |
| USER_TAB_PRIVS | Grants on objects for which the user is the owner, grantor or grantee |
| USER_TAB_PRIVS_MADE | All grants on objects owned by the user |
| USER_TAB_PRIVS_RECD | Grants on objects for which the user is the grantee |
| USER_TRIGGERS | Triggers owned by the user |
| USER_TRIGGER_COLS | Column usage in user's triggers |
| USER_TS_QUOTAS | Tablespace quotas for the user |
| USER_USERS | Information about the current user |
| USER_VIEWS | Text of views owned by the user |
| AUDIT_ACTIONS | Description table for audit trail action type codes. Maps action type numbers to action type names |
| COLUMN_PRIVILEGES | Grants on columns for which the user is the grantor, grantee, owner, or an enabled role or PUBLIC is the grantee |
| DICTIONARY | Description of data dictionary tables and views |
| DICT_COLUMNS | Description of columns in data dictionary tables and views |
| DUAL | |
| GLOBAL_NAME | global database name |
| INDEX_HISTOGRAM | statistics on keys with repeat count |
| INDEX_STATS | statistics on the b-tree |
| RESOURCE_COST | Cost for each resource |
| ROLE_ROLE_PRIVS | Roles which are granted to roles |
| ROLE_SYS_PRIVS | System privileges granted to roles |
| ROLE_TAB_PRIVS | Table privileges granted to roles |
| SESSION_PRIVS | Privileges which the user currently has set |
| SESSION_ROLES | Roles which the user currently has enabled. |
| TABLE_PRIVILEGES | Grants on objects for which the user is the grantor, grantee, owner, or an enabled role or PUBLIC is the grantee |
| ACCESSIBLE_COLUMNS | Synonym for ALL_TAB_COLUMNS |
| ALL_COL_GRANTS | Synonym for COLUMN_PRIVILEGES |
| ALL_JOBS | Synonym for USER_JOBS |
| ALL_TAB_GRANTS | Synonym for TABLE_PRIVILEGES |
| CAT | Synonym for USER_CATALOG |
| CLU | Synonym for USER_CLUSTERS |
| COLS | Synonym for USER_TAB_COLUMNS |
| DBA_AUDIT_CONNECT | Synonym for USER_AUDIT_CONNECT |
| DBA_AUDIT_RESOURCE | Synonym for USER_AUDIT_RESOURCE |
| DBA_REFRESH_CHILDREN | Synonym for USER_REFRESH_CHILDREN |
| DICT | Synonym for DICTIONARY |
| IND | Synonym for USER_INDEXES |
| OBJ | Synonym for USER_OBJECTS |
| SEQ | Synonym for USER_SEQUENCES |
| SM$VERSION | Synonym for SM_$VERSION |
| SYN | Synonym for USER_SYNONYMS |
| TABS | Synonym for USER_TABLES |
| V$ACCESS | Synonym for V_$ACCESS |
| V$ARCHIVE | Synonym for V_$ARCHIVE |
| V$BACKUP | Synonym for V_$BACKUP |
| V$BGPROCESS | Synonym for V_$BGPROCESS |
| V$CIRCUIT | Synonym for V_$CIRCUIT |
| V$COMPATIBILITY | Synonym for V_$COMPATIBILITY |
| V$COMPATSEG | Synonym for V_$COMPATSEG |
| V$CONTROLFILE | Synonym for V_$CONTROLFILE |
| V$DATABASE | Synonym for V_$DATABASE |
| V$DATAFILE | Synonym for V_$DATAFILE |
| V$DBFILE | Synonym for V_$DBFILE |
| V$DBLINK | Synonym for V_$DBLINK |
| V$DB_OBJECT_CACHE | Synonym for V_$DB_OBJECT_CACHE |
| V$DISPATCHER | Synonym for V_$DISPATCHER |
| V$ENABLEDPRIVS | Synonym for V_$ENABLEDPRIVS |
| V$FILESTAT | Synonym for V_$FILESTAT |
| V$FIXED_TABLE | Synonym for V_$FIXED_TABLE |
| V$LATCH | Synonym for V_$LATCH |
| V$LATCHHOLDER | Synonym for V_$LATCHHOLDER |
| V$LATCHNAME | Synonym for V_$LATCHNAME |
| V$LIBRARYCACHE | Synonym for V_$LIBRARYCACHE |
| V$LICENSE | Synonym for V_$LICENSE |
| V$LOADCSTAT | Synonym for V_$LOADCSTAT |
| V$LOADTSTAT | Synonym for V_$LOADTSTAT |
| V$LOCK | Synonym for V_$LOCK |
| V$LOG | Synonym for V_$LOG |
| V$LOGFILE | Synonym for V_$LOGFILE |
| V$LOGHIST | Synonym for V_$LOGHIST |
| V$LOG_HISTORY | Synonym for V_$LOG_HISTORY |
| V$MLS_PARAMETERS | Synonym for V_$MLS_PARAMETERS |
| V$MTS | Synonym for V_$MTS |
| V$NLS_PARAMETERS | Synonym for V_$NLS_PARAMETERS |
| V$NLS_VALID_VALUES | Synonym for V_$NLS_VALID_VALUES |
| V$OPEN_CURSOR | Synonym for V_$OPEN_CURSOR |
| V$OPTION | Synonym for V_$OPTION |
| V$PARAMETER | Synonym for V_$PARAMETER |
| V$PQ_SESSTAT | Synonym for V_$PQ_SESSTAT |
| V$PQ_SLAVE | Synonym for V_$PQ_SLAVE |
| V$PQ_SYSSTAT | Synonym for V_$PQ_SYSSTAT |
| V$PROCESS | Synonym for V_$PROCESS |
| V$QUEUE | Synonym for V_$QUEUE |
| V$RECOVERY_LOG | Synonym for V_$RECOVERY_LOG |
| V$RECOVER_FILE | Synonym for V_$RECOVER_FILE |
| V$REQDIST | Synonym for V_$REQDIST |
| V$RESOURCE | Synonym for V_$RESOURCE |
| V$ROLLNAME | Synonym for V_$ROLLNAME |
| V$ROLLSTAT | Synonym for V_$ROLLSTAT |
| V$ROWCACHE | Synonym for V_$ROWCACHE |
| V$SESSION | Synonym for V_$SESSION |
| V$SESSION_CURSOR_CACHE | Synonym for V_$SESSION_CURSOR_CACHE |
| V$SESSION_EVENT | Synonym for V_$SESSION_EVENT |
| V$SESSION_WAIT | Synonym for V_$SESSION_WAIT |
| V$SESSTAT | Synonym for V_$SESSTAT |
| V$SESS_IO | Synonym for V_$SESS_IO |
| V$SGA | Synonym for V_$SGA |
| V$SGASTAT | Synonym for V_$SGASTAT |
| V$SHARED_SERVER | Synonym for V_$SHARED_SERVER |
| V$SQLAREA | Synonym for V_$SQLAREA |
| V$STATNAME | Synonym for V_$STATNAME |
| V$SYSSTAT | Synonym for V_$SYSSTAT |
| V$SYSTEM_CURSOR_CACHE | Synonym for V_$SYSTEM_CURSOR_CACHE |
| V$SYSTEM_EVENT | Synonym for V_$SYSTEM_EVENT |
| V$THREAD | Synonym for V_$THREAD |
| V$TIMER | Synonym for V_$TIMER |
| V$TRANSACTION | Synonym for V_$TRANSACTION |
| V$TYPE_SIZE | Synonym for V_$TYPE_SIZE |
| V$VERSION | Synonym for V_$VERSION |
| V$WAITSTAT | Synonym for V_$WAITSTAT |
| V$_LOCK | Synonym for V_$_LOCK |
内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理 
相关文章推荐
- oracle PL\SQl基础 变量的使用
- Oracle游标大全
- Oracle隐式游标小例子
- oracle分析函数技术详解（配上开窗函数over()）
- ORACLE DBA 常用语句
- 小需求：批量导入Oracle数据源的字段注释到Informatica资料库
- oracle resetlogs未备份,用redo恢复
- Welcome to cx_Oracle’s documentation
- 【技术支持】使用eclipse登陆oracle
- Oracle数据迁移至HBase操作记录
- Oracle数据迁移至HBase操作记录
- oracle中实现截取字符串（substr）、查找字符串位置（instr）、替换字符串（replace）
- Oracle基础-UNION查询（DML）
- Oracle基础-UNION查询（DML）
- oracle 的自连接（self join）操作（转载的）
- oracle11g 手工建库
- Oracle基础-JOIN查询(DML)
- Oracle基础-JOIN查询(DML)
- Oracle Database 实例关闭和启动 浅谈
- oracle 数据仓库