Oracle snapshot and dblink use (data synchronization between two servers)

--Noun description:
source--the database to be synchronized-- 
destination--the database to be synchronized 
/*1. Create dblink:*/ 
--1. Create dblink on the destination database

drop database link dblink_anson;

Create public database link dblink_anson Connect to lg identified by lg using 'SDLGDB'; --源数据库的用户名、密码、服务器名 

/*2. Create a snapshot:*/ 
--1. Execute the following statements on the source and destination databases at the same time to create the tables to be synchronized.

drop table tb_anson; create table tb_anson(c1 varchar2(12)); 
alter table tb_anson add constraint pk_anson primary key (C1); 

--2. Test dblink on the target database
 

select * from tb_anson@dblink_anson;

select * from tb_anson; 

--3. On the destination database, create a snapshot log of the table to be synchronized.

Create snapshot log on tb_anson; 

--4. Create a snapshot, snapshot (the synchronized (source) database service must be started)

Create snapshot sn_anson as select * from mailto:tb_zhaozhenlong_1@dblink_zhaozhenlong_1;

--5. Set snapshot refresh time

Alter snapshot anson refresh fast Start with sysdate+1/24*60 next sysdate+10/24*60; --oracle自动在1分钟后进行第一次快速刷新，以后每隔10分钟快速刷新一次

Alter snapshot anson refresh complete Start with sysdate+30/24*60*60 next sysdate+1; --oracle自动在30钞后进行第一次完全刷新，以后每隔1天完全刷新一次 

--6. Manually refresh snapshots

begin 
dbms_refresh.refresh('"CS"."SN_ANSON"'); 
end;