oracle使用技巧

select 'alter table '||table_name||' allocate extent;' from user_tables where num_rows=0 or num_rows is null

查询表数量

SELECT    table_name   FROM    all_tables     WHERE     owner='BDCBDC1'  order by table_name;

创建临时表空间

create temporary tablespace user_temp 
tempfile 'D:\oracle\oradata\Oracle9i\user_temp.dbf' 
size 50m 
autoextend on 
next 50m maxsize 20480m 
extent management local; 

创建表空间

create tablespace user_data 
logging 
datafile 'D:\oracle\oradata\Oracle9i\user_data.dbf' 
size 50m 
autoextend on 
next 50m maxsize 20480m 
extent management local; 

误删恢复

insert into emp  

select *  --6分钟前删除的记录  

from(select * --6分钟前删除的记录  

     from emp as of timestamp sysdate - 6 / 1440 --6分钟前的原始数据  

     minus --减去  

     select * from emp --现在表中的记录

    )  

-- USER SQL

CREATE USER test IDENTIFIED BY test 

DEFAULT TABLESPACE "BDC"

TEMPORARY TABLESPACE "TEMP";

-- QUOTAS

-- ROLES

GRANT "IMP_FULL_DATABASE" TO test ;

GRANT "CONNECT" TO test ;

GRANT "RESOURCE" TO test ;

GRANT "EXP_FULL_DATABASE" TO test ;

ALTER USER test DEFAULT ROLE "IMP_FULL_DATABASE","CONNECT","RESOURCE","EXP_FULL_DATABASE";

-- SYSTEM PRIVILEGES

show parameter db_block_size ;

SELECT (SELECT MAX(block_id) FROM dba_extents WHERE tablespace_name = 'BDC')*8192/1024/1024 FROM dual;

ALTER DATABASE DATAFILE 'D:\soft\oracle\oradata\orcl\SYSTEM01.DBF' RESIZE 700M;

SELECT DBMS_METADATA.GET_DDL('TABLESPACE', TS.tablespace_name)

FROM DBA_TABLESPACES TS where TS.tablespace_name = 'BDC';