fix

Author: digoal

201704/20170413_01.md

@@ -1,4 +1,4 @@
-## PostgreSQL 内核层逻辑订阅给业务架构带来了什么？  
+## PostgreSQL 逻辑订阅 - 给业务架构带来了什么希望？  
                             
 ### 作者                               
 digoal                       
@@ -125,6 +125,34 @@ http://www.cybertec.at/en/products/walbouncer-enterprise-grade-partial-replicati
 
 ![pic](../201612/20161205_02_pic_003.png)  
 
+## 逻辑订阅例子
+逻辑订阅只需简单两步即可完成。   
+  
+1\. 建表、发布  
+  
+```
+src=# create table public.t1(id int primary key, info text, crt_time timestamp);  
+CREATE TABLE  
+  
+src=# create publication pub1 for table public.t1;  
+CREATE PUBLICATION  
+```
+    
+2\. 建表、订阅  
+  
+```
+dst=# create table public.t1(id int primary key, info text, crt_time timestamp);  
+CREATE TABLE  
+  
+dst=# create subscription sub1_from_pub1 connection 'hostaddr=xxx.xxx.xxx.xxx port=1922 user=postgres dbname=src' publication pub1 with (enabled, create slot, slot name='sub1_from_pub1');  
+NOTICE:  created replication slot "sub1_from_pub1" on publisher  
+CREATE SUBSCRIPTION  
+```
+  
+详情请参考  
+  
+[《PostgreSQL 10.0 preview 逻辑订阅 - 原理与最佳实践》](../201702/20170227_01.md)    
+    
 ## 逻辑订阅的冲突解决  
 逻辑订阅，本质上是事务层级的复制，需要在订阅端执行SQL。