oracle 移动高水位：
查看表的大小；
select a.blocks,a.bytes,a.bytes/1024/1024 from user_segments a
where a.segment_name='B_M_DZYH_CUST_SIGN_FACT';
首先
create table TEST_1228 as select * from user_tables;
insert into TEST_1228 select * from TEST_1228 ;
insert into TEST_1228 select * from TEST_1228 ;
insert into TEST_1228 select * from TEST_1228 ;
insert into TEST_1228 select * from TEST_1228 ;
insert into TEST_1228 select * from TEST_1228 ;
commit;
查看表的空间大小:记录为1
select a.blocks,a.bytes,a.bytes/1024/1024 from dba_segments a
where a.segment_name='TEST_1228'
删除表
delete from TEST_1228 ;
commit;
查看表的空间大小:记录为2
select a.blocks,a.bytes,a.bytes/1024/1024 from dba_segments a
where a.segment_name='TEST_1228'
移动高水位：
alter table TEST_1228 enable row movement
alter table TEST_1228 shrink space
查看表的空间大小:记录为3
select a.blocks,a.bytes,a.bytes/1024/1024 from dba_segments a
where a.segment_name='TEST_1228'
对比1，2，3结果，即可
相关文档：
1.在ORACLE中实现分布式快速存取和充实内存是很重要的。
要不惜任何代价避免页面调度和交换﹐每次都必须把系统全局区(SGA)放到内存。
将SGA放到内存中﹐在INIT.ORA中设置参数 PRE_PAGE_SGA
PRE_PAGE_SGA=YES
2.回卷段的竟争会降低系统的性能。
SELECT� ......
当使用'for update' 造成表锁住了.可以用DBA登陆按照下面步骤:
1.查看哪个表被锁:
select b.owner,b.object_name,l.session_id,l.locked_mode
from v$locked_object l, dba_objects b
where b.object_id=l.object_id;
2.查看被锁表的sid 和serial# :
select t2.username,t2.sid,t2.serial#,t2.logon_time
from v$lo ......
在Oracle中查看所有的表:
select * from tab/dba_tables/dba_objects/cat;
看用户建立的表 :
select table_name from user_tables; //当前用户的表
select table_name from all_tables; //所有用户的表 ......
1、写BAT文件
------------------------------------------------------------------------------------------------------
if "%time:~0,1%"==" " (set backup_file=%date:~0,4%%date:~5,2%%date:~8,2%-0%time:~1,1%%time:~3,2%%time:~6,2%) else (set backup_file=%date:~0,4%%date:~5,2%%date:~8,2%-%time:~0,2%%time: ......
