当前情况：大表的数据量已接近2亿条
我的解决思路：为它创建n*100个分区表，将各个分区表放在不同的tablespace上
这样做的优点：
1、首先是对这个级别的数据表的性能会有所提升
2、数据管理更科学
3、生产运维过程故障排查便捷

实验环境
VM Ware ESXi
Redhat 6.3 64bit
PostgreSQL 9.2/9.3
内存：2G

实现方法（同样适用于Oracle）

 1 /**
 2 创建300个分区表，每张表写入5万数据
 3 */
 4 -- -------------------- step1 : CREATE TABLE--------------------
 5 DROP TABLE parttest;
 6 CREATE TABLE parttest (some_test TEXT,some_tstimestamptz TEXT,random_value INT4, p_condition DATE)
 7 PARTITION BY RANGE(p_condition)
 8 (
 9     PARTITION p_2013_09_02_and_early VALUES LESS THAN ('2013-09-03')
10 );

 1 -- -------------------- step2 : CREATE PARTITION PROCEDUCE --------------------
 2 CREATE OR REPLACE PROCEDURE create_partition_withindex() AS
 3 
 4 DECLARE
 5    tblname varchar := 'parttest';
 6    tblname_prefix varchar := 'p_condition';   
 7    part_tbl_name varchar;
 8    current_part_name varchar;
 9    sql_addpartition_cmd varchar;
10    
11 BEGIN
12     -- POPULATE SQL COMMAND
13     -- PARTITION TABLE'S NAME IS LIKE "TABLENAME_p_2019_12_31"
14     FOR j IN 1..300 LOOP
15     current_part_name := to_char(current_date + j,'YYYY_MM_DD');
16     part_tbl_name := tblname_prefix || '_p_' || current_part_name;
17 
18     -- POPULATE SQL COMMAND STRING
19         sql_addpartition_cmd = 'ALTER TABLE ' || tblname || ' ADD PARTITION p_' || current_part_name || ' VALUES LESS THAN (''' || (current_date + j + 1) || ''');';
20     DBMS_OUTPUT.PUT_LINE(sql_addpartition_cmd);
21         EXECUTE IMMEDIATE sql_addpartition_cmd;
22 
23     IF ((j % 30) = 0) THEN
24         COMMIT;
25     END IF;
26         
27     END LOOP;
28 
29     EXECUTE IMMEDIATE 'ALTER TABLE ' || tblname || ' ADD PARTITION p_' || to_char(current_date + 300 + 1,'YYYY_MM_DD') || '_and_later VALUES LESS THAN (''' || (current_date + 300 + 2) || ''');';
30 END;

-- -------------------- step3 CREATE PARTITION --------------------
EXEC create_partition_withindex;

 1 -- -------------------- step4 CREATE TEST DATA PROCEDUCE --------------------
 2 
 3 CREATE OR REPLACE PROCEDURE create_partition_testdata() AS
 4 
 5 DECLARE
 6 
 7 BEGIN
 8     FOR i IN 0..300 LOOP
 9     INSERT INTO parttest (some_test, some_tstimestamptz, random_value,p_condition)
10     SELECT
11         'user #' || cast(floor(random() * 10) as int4),    
12     now() - '1 year'::INTERVAL * random(),
13     cast(random() * 100000000 as INT4),
14     (current_date + i)
15     FROM
16     generate_series(1,500000);
17     COMMIT;
18     END LOOP;
19 END;

-- -------------------- step5 CREATE TEST DATA --------------------
EXEC create_partition_testdata;

SELECT COUNT(*) FROM parttest;