Oracle数据库的各种概念和组成

1.数据库空间

create tablespace danny_space datafile 'C:\oraclexe\app\oracle\oradata\XE\danny_space_data.dbf' size 500M;

SELECT tablespace_name,
         SUM(bytes) bytes,
         MAX(bytes) largest
    FROM dba_free_space
   Group By Tablespace_Name;


select tablespace_name from dba_tablespaces;

你的数据库路径下有个oradata的文件夹里面放着oracle某个数据库空间文件，数据库资料在这里。

2.空间下建立用户

createuserzhuidentifiedbyzhudefaulttablespacedanny_space;

3.对用户进行授权

grantconnect,resourcetonews;--表示把connect,resource权限授予news用户

grantdbatonews;--表示把dba权限授予给news用户

grant dba to Zhu;

创建空间并且能自增空间

createtablespaceBTADATAdatafile'/home/app/oracle/oradata/ifp30/BTADATA.dbf'size100Mautoextendonnext50M;

删除表空间：

DROPTABLESPACEtable_spacenameINCLUDINGCONTENTSANDDATAFILES;

更改自动扩展属性

alterdatabasedatafile

'/home/app/oracle/oradata/oracle8i/sales01.dbf',

'/home/app/oracle/oradata/oracle8i/sales02.dbf'

'/home/app/oracle/oradata/oracle8i/sales01.dbf

autoextendoff;

为表空间增加数据文件：

altertablespacesalesadd

datafile'/home/app/oracle/oradata/oracle8i/sales02.dbf'size800M

autoextendonnext50M

maxsize1000M;

droptablespacexxxincludingcontentsanddatafiles

3.创建表

CREATE TABLE "ZHU"."GCFW_APPLICATION" 
   (	"APPLICATION_ID" NUMBER NOT NULL ENABLE, 
	"NAME" VARCHAR2(64 CHAR) NOT NULL ENABLE, 
	"STATE" VARCHAR2(32 CHAR), 
	"LOG_LEVEL" VARCHAR2(32 CHAR), 
	"CREATED_BY" VARCHAR2(30) NOT NULL ENABLE, 
	"UPDATED_AT" TIMESTAMP (6) WITH TIME ZONE, 
	"UPDATED_BY" VARCHAR2(30), 
	"CREATED_AT" TIMESTAMP (6) WITH TIME ZONE, 
	"CREATED_FROM" VARCHAR2(100) DEFAULT SYS_CONTEXT('USERENV','HOST'), 
	"UPDATED_FROM" VARCHAR2(100), 
	 CONSTRAINT "PK_1031" PRIMARY KEY ("APPLICATION_ID")
  USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS 
  TABLESPACE "DANNY_SPACE"  ENABLE
   )  
  PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 
 Nocompress Logging
  TABLESPACE "DANNY_SPACE"