利用dblink实现Oracle对Oracle数据库的同步
利用dblink 做Oracle到oracle的定时同步,以刚为卡中心做的一个同步为例
推荐阅读:
1、创建需要的dblink连接的数据库(若已经有,则不需要)
例:
查看 dblink : select * from dba_db_links;
创建 dblink :
create database link ECARDRYXX
connect to WPENG
using '(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 202.120.85.118)(PORT = 1521))
)
(CONNECT_DATA =
(SID = ORA92)
)
)';
2. 创建需要同步到对方数据的视图:
例:
create or replace view ryxx as
select ryjbxx.userid outid, xyzzjg.bmmc college, xszzjg.bmmc departname, ryjbxx.major,
ryjbxx.typeof, ryjbxx.sfsf, ryjbxx.cn, ryjbxx.email, decode(sys_user.STATUS, '2', 'Yes', '4', 'No', 'No') inetUserStatus
from
(
select t1.xh userid, t1.xym , t1.xsm , t2.zymc major,
'student' typeof, t1.sfsf sfsf, t1.xm cn, t1.dzxx email
from idc_u_xs.xs_xsjbxx t1, idc_u_jwmis.jw_zyxx t2
where t1.zyh = t2.zydh(+) -- 本科生
union all
select t1.xh userid, t1.xym, t1.xsm, t2.zymc, 'student' typeof, '' sfsf, t1.xm cn, t1.email email
from idc_u_yjs.yjs_yjsjbxx t1, idc_u_yjs.yjs_dict_bsxkzydm t2
where t1.zydm = t2.zydm(+) -- 研究生
union all
select t1.zgh userid, '' xym, '' xsm, '' major, 'teacher' typeof, '' sfsf, t1.xm cn, t1.dzxx email
from idc_u_rs.rs_zzryjbxx t1 -- 在职人员
union all
select t1.zgh userid, '' xym, '' xsm, '' major, 'teacher' typeof, '' sfsf, t1.xm cn, t1.dzxx email
from idc_u_rs.rs_xjrylsb t1 -- 新增人员
) ryjbxx, idc_u_pub.sys_user, idc_u_rs.rs_zzjg xyzzjg, idc_u_rs.rs_zzjg xszzjg
where
ryjbxx.userid = sys_user.userid
and ryjbxx.xym = xyzzjg.bmbh(+) -- 学院组织机构
and ryjbxx.xym = xszzjg.bmbh(+) -- 院系组织机构
3. 创建需要执行同步的pl/sql :
例如:
为了使用更模块化,更集中,建议同面向同一个库的pl/sql,写在同一个包下。
CREATE OR REPLACE PACKAGE ECARD IS
PROCEDURE RYXXSYNC;
END;
CREATE OR REPLACE PACKAGE BODY ECARD IS
PROCEDURE RYXXSYNC IS
BEGIN
delete from wpeng.ryxx@ecardryxx; --删除数据
insert into wpeng.ryxx@ecardryxx(outid, college, departname, major, typeof, sfsf, cn, email, inetuserstatus)
select outid, college, departname, major, typeof, sfsf, cn, email, inetuserstatus from ryxx; --插入最新数据
END;
END;
4. 创建job,定时执行同步:
例:
打开 sql命令窗口:
variable ryxxsyncjob number;
begin
dbms_job.submit(:ryxxsyncjob, 'ECARD.RYXXSYNC;',
SYSDATE, 'TRUNC(SYSDATE) + 1 + 2/24'); --每天凌晨两点执行。
commit;
end;