创建语句CREATE TABLE ... ORGANIZATION EXTERNAL包含了两部分信息:第一部分描述了各个列及其类型,类似于view;第二部分描述了external data 是如何映射到各个列的. 如果External Table 不是通过ORACLE_DATADUMP access driver 的 CREATE TABLE ASSELECT 来进行创建, 则此 table 是只读的,且不支持index column, virtual...
oracle 的 schema 逻辑上存储在 tablespace 里, 但 schema 与 tablespace 之间并无直接关系, 一个 tablespace 可以存储多个 schema, 一个 schema 也可以存储在几个 tablspace 里. 物理实现上,每个 schema object 存储在一个或多个 data file 里. 3. 依赖关系 如果在 schema A 中引用了 schema B, 那么A是B...
involveOracletonon-Oracledatabaselinks ■Applicationdeveloperswhowanttousetheheterogeneousconnectivity functionalityinOracledatabase ■Readerswhowantahigh-levelunderstandingofOraclesarchitecturefor heterogeneousconnectivityandhowitworks Tousethisguide,youmustbefamiliarwithrelationaldatabaseconceptsandbasic databaseorapplicatio...
This chapter explains the nature of an Oracle database instance, the parameter and diagnostic files associated with an instance, and what occurs during instance creation and the opening and closing of a database.This chapter contains the following sections:Introduction...
在oracle database 11g release 2(11.2.0.2),你也可以使用TRUNCATE伴随DROP ALL STORAGE选项去删除整个段。 ·你可以释放没有使用的空间,在数据库段的尾部释放没有使用的空间到达高水位标记,并且使得在表空间里面的其它段的空间可用。 当区自由的时候,oracle数据库在数据文件里面的位图为了本地管理表空间去反映恢复...
Oracle Database Concepts 10g Release 2 (10.2). Michele Cyran. . 2005Michele Cyran.Oracle Database Concepts,10g Release 2(10.2). . 2005CYRAN, Michele et al. Oracle(R) database: concepts - 10g release 2. [S.l.], 2005. Disponivel em: ...
3.1.1 Oracle® Database 11g Server Documentation Table 3-1 Oracle® Database Server Documentation DocumentationPart NumberDescription Administration, Concepts, and Reference Oracle Database Globalization Support Guide E10729 Describes Oracle globalization support for the database. Explains how to set...
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(9i,10gR1,10gR2,11gR1,11gR2) Description: --- Oracle Data Mining (ODM) embeds data mining within the Oracle database. ODM algorithms operate natively on relational tables or views, thus eliminating the need to extract and transfer data into standalone tools or specialized analytic servers....
In Oracle Database 11g release 2 (11.2), the DEFERRED_SEGMENT_CREATION parameter is set to TRUE by default. This means that any tables you create do not have any segments until the first row of data is inserted into the table. Original Export ignores tables without segments. Therefore, if...