描述:逻辑存储结构(Logical Storage Structures)使 Oracle Database 能够对磁盘空间使用进行细粒度控制,此处从逻辑的角度分析Oracle数据库的组成包括方案(Schema)、数据块(Data Block)、区间(Extent)、段(Segment)、表(Table)和表空间(Tablespace)等知识。 关系:数据库由若干个表空间组成,表空间由又由多个段组成,段由...
database tablespace segment extent block 3.2.1 表空间和数据文件 数据在物理上是存储在数据文件(data files)上,从逻辑上看数据存储在段(通常是表)中。 表空间是二者的抽象,是一个逻辑的概念 早期数据库中表、索引等对象(段)和文件(data file)之间是一对一的关系,缺点是当表比较多时,不便于系统管理员管理,...
A database can have a mixture of Oracle-managed and unmanaged files. 对的 Enlarging the Database You can enlarge the database in the following ways: • Create a new tablespace. • Add a data file to an existing smallfile tablespace. • Increase the size of a data file. • Provide...
A-14 Oracle Automatic Storage Management: Oracle By Example Series ... A-14 Index xii List of Figures 6–1 6–2 11–1 Oracle Database Storage Structures ... 6-2 Online Redo Log Groups and Their Members ...
Database Storage Structures A database can be considered from both a physical and logical perspective. Physical data is data viewable at the operating system level. For example, operating system utilities such as the Linuxlsandpscan list database files and processes. Logical data such as a table...
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, ...
Exadata Database Machine X11M is based on a unique, scale-out architecture that integrates the latest AMD EPYC processors in database servers and intelligent storage servers to provide higher per-core performance than previous-generation platforms. Intelligent storage servers offload SQL and AI Vector...
Storage structures. Oracle’s XML implementation gives us the flexibility to store data in two different ways: as structured and unstructured storage. XMLType data is unstructured when stored as a single LOB column and structured when implemented as a set of objects. One specific example of this...
A backup created using RMAN is typically used as a test database before applying backup and recovery procedures on a real database, before saving RMAN backups as long-term storage solutions. As seen in the following image, RMAN connects to the source database that needs backing up and then...
--使用`ALTER DATABASE BACKUP CONTROLFILE`命令备份:SQL>ALTERDATABASEBACKUPCONTROLFILETO'/path/to/backup/location1';--推荐使用RMAN备份RMAN>BACKUPCURRENTCONTROLFILETO'/path/to/backup/location2';--如果控制文件损坏或丢失,您可以使用RMAN来恢复它,数据库启动到mount状态RMAN>RESTORECONTROLFILEFROM'/path/to/...