(1)How Postgresql Processes a Query
(2) why can not alter table column to serial?
postgres=# \d
No relations found.
postgres=# create table t1(id1 int,id2 int,id3 serial);
CREATE TABLE
postgres=# \d
List of relations
Schema | Name | Type | Owner
--------+------------+----------+-------
public | t1 | table | wln
public | t1_id3_seq | sequence | wln
(2 rows)
postgres=# alter table t1 alter column id2 set DATA TYPE text;
ALTER TABLE
postgres=# alter table t1 alter column id1 set DATA TYPE serial;
ERROR: type "serial" does not exist
LOCATION: typenameType,parse_type.c:205
（3）全球级的分布式数据库 Google Spanner原理
http://blogread.cn/it/article/5862?f=wb
（4）read article:THE IMPLEMENTATION OF POSTGRES
(文章写于1989)
2014.07.29 07:00:00 ---2014.07.29 21:24
（5）how the heartbeat works?
2014.09.14--
（6）how to make prime postgres switch to standby postgres using the heartbeat software?
and do it in the linux enviroment.
2014.09.14--
（7）阅读分布式数据库系统及应用
2014.11.23--
参考
（1）PostgreSQL Hardware Performance Tuning
（2）How PostgreSQL Processes a Query
（8）
http://bbs.chinaunix.net/thread-951213-1-1.html
http://blog.chinaunix.net/uid-20722281-id-160013.html
http://wenku.baidu.com/view/b3a41a49c281e53a5902ff4f.html
(9) postgres streaming
http://www.pgcon.org/2008/schedule/attachments/61_Synchronous%20Log%20Shipping%20Replication.pdf
