Add comments to the data dictionary The CREATE, ALTER, and DROP commands require exclusive access to the specified object. For example, an ALTER TABLE statement fails if another user has an open transaction on the specified table. The GRANT, REVOKE, ANALYZE, AUDIT, and COMMENT commands do not...
Not all views sets have three members. For example, the data dictionary contains a DBA_LOCK view but no ALL_LOCK view. 查看全部的数据字典 dictionary Oracle 11g中数据字典视图2577个,神仙也记不住,但是有个dictionary视图,该视图里记录了所有的数据字典视图的名称。所以当我们需要查找某个数据字典而又不...
如果执行“ALTER DATABASE DATAFILE N OFFLINE DROP;”后并在OS级别删除了数据文件,那么首先需要使用“ALTER DATABASE CREATE DATAFILE N AS '/tmp/ts_dd_lhr02.dbf';”来添加一个数据文件,然后再执行RECOVER并ONLINE后再用“ALTER TABLESPACE XXX DROP DATAFILE N;”命令删除。如果产生的日志文件以及丢失,那么目标...
数据库和实例是Oracle数据库的两个重要组成部分,它们之间有着密切的关系。5一般来说,一个数据库只能被一个实例访问,这种模式叫做单实例数据库(Single Instance Database)。但是,在某些情况下,一个数据库可以被多个实例访问,这种模式叫做多实例数据库(Multi Instance Database),也叫做Oracle Real Application Clusters(R...
select*fromdba_data_files;select*fromdba_tablespaces;--表空间selecttablespace_name,sum(bytes),sum(blocks)fromdba_free_spacegroupbytablespace_name;--空闲表空间select*fromdba_data_fileswheretablespace_name='USERS';--表空间对于的数据文件select*fromdba_segmentswheretablespace_name='USERS';--查询用户模式...
Chapter 4. Oracle Data Structures In the previous chapters, we examined some distinctions between the different components that make up an Oracle Database. For example, we pointed out that the Oracle instance differs from the files that make up the physical storage of the data in tablespaces, ...
–查看表空间SELECTTABLESPACE_NAME,STATUS,CONTENTSFROMDBA_TABLESPACES;–删除表空间DROPTABLESPACEdb_test INCLUDING CONTENTSANDDATAFILES; 用户 用户是数据库的访问者和使用者,它是一种数据库对象,用于标识数据库的登录者和拥有者。用户可以拥有自己的数据库对象,也可以访问其他用户的数据库对象,这取决于用户的权限和角...
Exports can also be done without data, to provide just the structures, which we can then copy to another schema or save as a backup. Recycle Bin The Oracle recycle bin works with the tables that have been dropped. For example, if we are refreshing a couple of tables and we realized ...
- Updated example sentences Love words? Need even more definitions? Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Merriam-Webster unabridged Popular in Grammar & Usage See More Words You Always Have to Look Up ...
通过查询数据库系统中的数据字典表(data dictionary tables)获取表空间的相关信息,首先使用客户端工具连接到数据库,这些工具可以是SQLPLUS字符工具、TOAD、PL/SQL等,连接到数据库后执行如下的查询语句: select a.a1 表空间名称, c.c2 类型, c.c3 区管理, ...