Oracle数据库的存储结构: 从逻辑的角度来看,一个数据库(database)下面可以分多个表空间(tablespace);一个表空间下面又可以分多个段(segment);一个数据表要占一个段(segment),一个索引也要占一个段(segment)。 一个段(segment)由多个 区间(extent)组成,那么一个区间又由一组连续的数据块(data block)组成。这连...
官方文档对于DBA_TABLESPACES的描述是:DBA_TABLESPACESdescribes all tablespaces in the database。USER_TABLESPACESdescribes the tablespaces accessible to the current user。翻译过来是,DBA_TABLESPACES描述了数据库中的所有表空间。DBA_TABLESPACES描述了当前用户可访问的表空间。 使用DBA_TABLESPACES,查询表空间名称、表空...
databases and datafiles A database's data is collectively stored in the datafiles that constitute each tablespace of the database. For example, the simplest Oracle database would have one tablespace and one datafile. Another database might have three tablespaces, each consisting of two datafiles...
Oracle Database,又名Oracle RDBMS,或简称Oracle。是甲骨文公司的一款关系数据库管理系统。它是在数据库领域一直处于领先地位的产品。可以说Oracle数据库系统是目前世界上流行的关系数据库管理系统,系统可移植性好、使用方便、功能强,适用于各类大、中、小、微机环境。它是一种高效率、可靠性好的 适应高吞吐量的数据...
You manage tablespaces in your Oracle database to avoid tablespace overflow, which is when a tablespace runs out of freespace in the allocated file or files. This happens when an object requires a new extent but there is either no freespace or insufficient freespace in the tablespace....
Oracle stores data locically in tablespaces and physically in datafiles associated with the corresponding tablespace. Database, tablespaces, and datafiles are closely related, but they have important differences: - An Oracle database consists of one or more logical storage usnits calles tablespaces, ...
詳細は、『Oracle Database概要』を参照。 DEF_INMEMORY VARCHAR2(8) この表領域のテーブルで、インメモリー列ストア(IM列ストア)がデフォルトで使用可能(ENABLED)または使用禁止(DISABLED)のどちらであるか DEF_INMEMORY_PRIORITY VARCHAR2(8) この表領域のインメモリー列ストア(IM列スト...
You are creating tablespaces in Oracle. Which of the following keywords or clauses permits the datafiles of a database to grow automatically in order to accommodate data growth?() A. DEFAULT STORAGE B. EXTENT MANAGEMENT...
Amazon RDS only supports Oracle Managed Files (OMF) for data files, log files, and control files. When you create data files and log files, you can't specify the physical file names. By default, if you don't specify a data file size, tablespaces are created with the default of ...
You are creating tablespaces in Oracle. Which of the following keywords or clauses permits the datafiles of a database to grow automatically in order to accommodate data growth?()...