举比例如以下: SQL> Gruant dba to scott SQL> create table test(name char(10)); Table created. SQL> create table system.test(name char(10)); Table created. SQL> insert into test values(‘scott’); 1 row created. SQL> insert into system.test values(‘system’); 1 row created. SQL>...
在系统表user_tables中也可以看到segment_treated的字段里是“NO”或者“YES”说明了某张表是否分配了segment。说白了是为了可以节省少量的空间。 用下面的SQL语句查询,可以发现没有导出的表其 segment_created 字段值都是 'NO'。 Select segment_created,table_name from user_tables where segment_created = 'NO'...
–ORACLE_SIDrun1.sql spool C:ORACLE8IadminORACLE_SIDcreatecreatedb1 set echo on connect INTERNAL/oracle ALTER DATABASE DATAFILE ‘C:ORACLE8IoradataORACLE_SIDsystem01.dbf’AUTOEXTEND ON; CREATE ROLLBACK SEGMENT SYSROL TABLESPACE “SYSTEM” STORAGE (INITIAL100K NEXT 100K); ALTER ROLLBACK SEGMENT “...
Serializable transactions do not work with deferred segment creation. Trying to insert data into an empty table with no segment created causes an error. See Also: Oracle Database Concepts for general information on segment allocation and Oracle Database Reference for more information about the DEFERRE...
首先我们创建一个数据表justForTest,来观察数据库是否为此表分配segment。 SQL> create table justForTest(test1 varchar2(2)); Table created 但是,对应的段segment对象,却没有创建出来,如下: select segment_name, BYTES, BLOCKS, EXTENTS from user_segments where segment_name='JUSTFORTEST'; ...
JOIN_INDEX:索引是否是结合的 IOT_REDUNDANT_PKEY_ELIM:在索引组织表中,冗余的主键列是否从从索引中删除 DROPPED:索引是否已经被删除,并在recycle中 VISIBILITY:索引是否可见 DOMIDX_MANAGEMENT:如果是域索引,主索引是系统管理还是用户管理 SEGMENT_CREATED:索引段是否已经创建...
SELECT SEGMENT_CREATED,TABLE_NAME FROM USER_TABLES WHERE SEGMENT_CREATED = 'NO'; 延迟段创建的限制条件有: ①延迟段创建不支持的表类型包括:索引组织表(Index-Organized Tables)、簇表(Clustered Tables)、全局临时表(Global Temporary Tables)、会话级临时表(Session-Specific Temporary Tables)、内部表(Internal...
--- ---OWNERNOTNULLVARCHAR2(30)-- ALL_TABLES比USER_TABLES多了一列OWNER,以指明该表属于哪个用户-- 但除此以外表机构几乎一致TABLE_NAMENOTNULLVARCHAR2(30)TABLESPACE_NAME VARCHAR2(30)CLUSTER_NAME VARCHAR2...READ_ONLY VARCHAR2(3)SEGMENT_CREATED VARCHAR2(3)RESULT_CACHE VARCHAR2 1. 2. 3. 4...
LEO1@LEO1> create tablespace mssm_leo1 datafile '/u01/app/oracle/oradata/LEO1/mssm_leo1.dbf' size 50m autoextend off segment space management manual; Tablespace created. LEO1@LEO1> select tablespace_name,segment_space_management from user_tablespaces where tablespace_name in ('LEO1','NEW_LE...
selectdr.tablespace_name, dr.segment_name, vr.statusfromdba_rollback_segs dr, v$rollstat vrwheredr.segment_id=vr.usn; 确实无误后,执行删除原有UNDOTBS1, droptablespaceUNDOTBS1includingcontentsanddatafiles; 再查看, SELECT*FROMDBA_DATA_FILES; ...