学ORACLE随笔
//删除用户
drop user lc0019999 cascade
//创建用户
create user lc0019999 identified by password
//给用户授DBA权限
grant dba to lc0019999
//导入数据
$imp lc0019999/password@server file=e:back312.dmp fromuser=lc0019999 touser=lc0019999
//导出数据
$exp lc0019999/password@server file=e:backaaa.dmp
//更改sys与system口令
alter user system(sys) identified by newpassword
//更改归档日志方式archivelog与noarchivelog
alter database archivelog(noarchivelog)
//整理蜂窝式碎片的方式
alter tablespace tablespacename coalesce
//查看缺省表空间与临时表空间
select username from dba_users where default_tablespace='system' or temporary_tablespace='system' order by username
//将缺省表空间与临时表空间改为非system
alter user rsingh default users temporary temp
//创建表空间命令
create tablespace tablespacename...(other command options)...extent management local uniform size 10M
//在不同表空间之间移动索引
alter index
//分析数据表空间(执行结果不可见)
analyze table
//查询表最高点与表的未用块
select blocks "high water mark",empty_blocks "unused space" from dba_tables where table_name='&table_name' and owner='&owner_name'
//释放未用表空间
alter table
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