alter rollback segment "RB1" offline;
alter rollback segment "RB2" offline;
alter rollback segment "RB3" offline;
alter rollback segment "RB4" offline;
alter rollback segment "RB5" offline;
alter rollback segment "RB6" offline;
alter rollback segment "RB7" offline;
alter rollback segment "RB8" offline;
alter rollback segment "RB9" offline;
alter rollback segment "RB10" offline;
alter rollback segment "RB11" offline;
alter rollback segment "RB12" offline;
alter rollback segment "RB13" offline;
alter rollback segment "RB14" offline;
alter rollback segment "RB15" offline;
alter rollback segment "RB16" offline;

drop rollback segment "RB1";
drop rollback segment "RB2";
drop rollback segment "RB3";
drop rollback segment "RB4";
drop rollback segment "RB5";
drop rollback segment "RB6";
drop rollback segment "RB7";
drop rollback segment "RB8";
drop rollback segment "RB9";
drop rollback segment "RB10";
drop rollback segment "RB11";
drop rollback segment "RB12";
drop rollback segment "RB13";
drop rollback segment "RB14";
drop rollback segment "RB15";
drop rollback segment "RB16";

create rollback segment "RB1" tablespace "ROLLBACK_DATA" storage (initial 1m next 1m);
create rollback segment "RB2" tablespace "ROLLBACK_DATA" storage (initial 1m next 1m);
create rollback segment "RB3" tablespace "ROLLBACK_DATA" storage (initial 1m next 1m);
create rollback segment "RB4" tablespace "ROLLBACK_DATA" storage (initial 1m next 1m);
create rollback segment "RB5" tablespace "ROLLBACK_DATA" storage (initial 1m next 1m);
create rollback segment "RB6" tablespace "ROLLBACK_DATA" storage (initial 1m next 1m);

alter rollback segment "RB1" online;
alter rollback segment "RB2" online;
alter rollback segment "RB3" online;
alter rollback segment "RB4" online;
alter rollback segment "RB5" online;
alter rollback segment "RB6" online;

alter database add logfile c:/orant/database/log1.ora size 10m;
alter database add logfile c:/orant/database/log2.ora size 10m;
alter database add logfile c:/orant/database/log3.ora size 10m;
alter database add logfile c:/orant/database/log4.ora size 10m;
alter database drop logfile c:/orant/database/log1orcl.ora;
alter database drop logfile c:/orant/database/log2orcl.ora;
alter database drop logfile c:/orant/database/log3orcl.ora;
alter database drop logfile c:/orant/database/log4orcl.ora;

INITORAL.ORA配置：
SGA=db_block_buffers*db_block_size+share_pool_size+log_buffers+sort_arer_size+1m
=1/3--1/2
以128M為例：

DB_BLOCK_BUFFERS=16000（db_block_size=2k）
SHARE_POOL_SIZE=30720000(服務器要增大10倍)
LOG_BUFFERS=655360
SORT_AREA_SIZE=327680(服務器要增大100倍)－－－－－－－－－－添加
GLOBAL_NAME=FALSE
ROLLBACK_SEGEMENTS=(RB1,RB2)//一般大型數據庫要建立6－8個回滾段

添加：
DML_LOCKS=1000
OPEN_CURSORS=200