标记列删除恢复
SQL*Plus: Release 9.0.1.0.1 - Production on 星期二 9月 19 15:05:59 2006
(c) Copyright 2001 Oracle Corporation. All rights reserved.
请输入用户名: system/manager
连接到:
Oracle9i Enterprise Edition Release 9.0.1.1.1 - Production
With the Partitioning option
JServer Release 9.0.1.1.1 - Production
SQL> create table stu
2 (stu_code varchar2(10),
3 stu_name varchar2(10),
4 stu_age varchar2(3));
表已创建。
SQL> insert into stu values('001', 'Jack', '25');
已创建 1 行。
SQL> insert into stu values('002', 'Tom', '24');
已创建 1 行。
SQL> insert into stu values('003', 'Jerry', '25');
已创建 1 行。
SQL> select * from stu;
STU_CODE STU_NAME STU
---------- ---------- ---
001 Jack 25
002 Tom 24
003 Jerry 25
SQL> conn sys/change_on_install as sysdba
已连接。
SQL> desc obj$
名称 是否为空? 类型
----------------------------------------- -------- ----------------------------
OBJ# NOT NULL NUMBER
DATAOBJ# NUMBER
OWNER# NOT NULL NUMBER
NAME NOT NULL VARCHAR2(30)
NAMESPACE NOT NULL NUMBER
SUBNAME VARCHAR2(30)
TYPE# NOT NULL NUMBER
CTIME NOT NULL DATE
MTIME NOT NULL DATE
STIME NOT NULL DATE
STATUS NOT NULL NUMBER
REMOTEOWNER VARCHAR2(30)
LINKNAME VARCHAR2(128)
FLAGS NUMBER
OID$ RAW(16)
SPARE1 NUMBER
SPARE2 NUMBER
SPARE3 NUMBER
SPARE4 VARCHAR2(1000)
SPARE5 VARCHAR2(1000)
SPARE6 DATE
SQL> select obj#, name from obj$ where name = 'STU';
/****注 :name是表名，表名必须大写************/
OBJ# NAME
---------- ------------------------------
32132 STU
SQL> desc tab$
名称 是否为空? 类型
----------------------------------------- -------- ----------------------------
OBJ# NOT NULL NUMBER
DATAOBJ# NUMBER
TS# NOT NULL NUMBER
FILE# NOT NULL NUMBER
BLOCK# NOT NULL NUMBER
BOBJ# NUMBER
TAB# NUMBER
COLS NOT NULL NUMBER
CLUCOLS NUMBER
PCTFREE$ NOT NULL NUMBER
PCTUSED$ NOT NULL NUMBER
INITRANS NOT NULL NUMBER
MAXTRANS NOT NULL NUMBER
FLAGS NOT NULL NUMBER
AUDIT$ NOT NULL VARCHAR2(38)
ROWCNT NUMBER
BLKCNT NUMBER
EMPCNT NUMBER
AVGSPC NUMBER
CHNCNT NUMBER
AVGRLN NUMBER
AVGSPC_FLB NUMBER
FLBCNT NUMBER
ANALYZETIME DATE
SAMPLESIZE NUMBER
DEGREE NUMBER
INSTANCES NUMBER
INTCOLS NOT NULL NUMBER
KERNELCOLS NOT NULL NUMBER
PROPERTY NOT NULL NUMBER
TRIGFLAG NUMBER
SPARE1 NUMBER
SPARE2 NUMBER
SPARE3 NUMBER
SPARE4 VARCHAR2(1000)
SPARE5 VARCHAR2(1000)
SPARE6 DATE
SQL> select obj#, cols from tab$ where obj# = 32132;
OBJ# COLS
---------- ----------
32132 3
SQL> desc col$
名称 是否为空? 类型
----------------------------------------- -------- ----------------------------
OBJ# NOT NULL NUMBER
COL# NOT NULL NUMBER
SEGCOL# NOT NULL NUMBER
SEGCOLLENGTH NOT NULL NUMBER
OFFSET NOT NULL NUMBER
NAME NOT NULL VARCHAR2(30)
TYPE# NOT NULL NUMBER
LENGTH NOT NULL NUMBER
FIXEDSTORAGE NOT NULL NUMBER
PRECISION# NUMBER
SCALE NUMBER
NULL$ NOT NULL NUMBER
DEFLENGTH NUMBER
DEFAULT$ LONG
INTCOL# NOT NULL NUMBER
PROPERTY NOT NULL NUMBER
CHARSETID NUMBER
CHARSETFORM NUMBER
SPARE1 NUMBER
SPARE2 NUMBER
SPARE3 NUMBER
SPARE4 VARCHAR2(1000)
SPARE5 VARCHAR2(1000)
SPARE6 DATE
SQL> select obj#, col#, name, intcol#, property from col$ where obj# = 32132;
OBJ# COL# NAME INTCOL# PROPERTY
---------- ---------- ------------------------------ ---------- ----------
32132 1 STU_CODE 1 0
32132 2 STU_NAME 2 0
32132 3 STU_AGE 3 0
SQL> conn system/manager
已连接。
SQL> alter table stu set unused (stu_name);
表已更改。
SQL> alter table stu set unused (stu_age);
表已更改。
SQL> select * from stu;
STU_CODE
----------
001
002
003
SQL> conn sys/change_on_install as sysdba
已连接。
SQL> select obj#, cols from tab$ where obj# = 32132;
OBJ# COLS
---------- ----------
32132 1
SQL> update tab$ set cols = 3 where obj# = 32132;
已更新 1 行。
SQL> select obj#, cols from tab$ where obj# = 32132;
OBJ# COLS
---------- ----------
32132 3
SQL> select obj#, col#, name, intcol#, property from col$ where obj# = 32132;
OBJ# COL# NAME INTCOL# PROPERTY
---------- ---------- ------------------------------ ---------- ----------
32132 1 STU_CODE 1 0
32132 0 SYS_C00002_06091915:22:04$ 2 32800
32132 0 SYS_C00003_06091915:22:19$ 3 32800
SQL> update col$ set col# = 2, name = 'STU_NAME', property = 0 where intcol# = 2 and property = 32800;
已更新 1 行。
SQL> update col$ set col# = 3, name = 'STU_AGE', property = 0 where intcol# = 3 and property = 32800;
已更新 1 行。
SQL> conn system/manager
已连接。
SQL> select * from stu;
STU_CODE
----------
001
002
003
SQL> alter system flush shared_pool;
系统已更改。
SQL> select * from stu;
STU_CODE STU_NAME STU
---------- ---------- ---
001 Jack 25
002 Tom 24
003 Jerry 25
SQL>