Oracle 建立數據庫dblink 然後同步部分表內容的總結

同步處理部分數據

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背景

• 最近在項目上發現兩個分庫進行數據同步時部分內容同步存在問題.
• 最簡單的方法是導表,但是害怕有其他關聯信息異常, 所以同事想到了dblink的方式.
• 這裏簡單整理一下 同事用到的方法 作爲總結 備忘.

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建立數據庫連接

create database  link test connect to yourname identified by "yourpassword"
using '(DESCRIPTION =(ADDRESS_LIST =
(ADDRESS =
(PROTOCOL = TCP)
(HOST = someip)
(PORT = 1521)))
(CONNECT_DATA =(SERVICE_NAME = servicename)))';

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記性備份,以及添加未同步的數據

select * from sometable@fzzk where id not in(select id from sometable)
create table somtable_1206bak as select * from somtable
insert into sometable select * from sometable@fzzk where id not in(select id from sometable)

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升級不一致的數據

merge into somtable a
using sometable@fzzk b
on (a.id=b.id)
when matched then
  update set a.treeinfo_path = b.treeinfo_path