Greeplum 系列（四） 实战

Greeplum 系列（四） 实战

表结构

(1) 拉链表结构

create table public.member_fatdt0 (
    member_id varchar(64),
    phoneno varchar(64),
    dw_beg_date date,
    dw_end_date date,
    dtype char(1),
    dw_status char(1),
    dw_ins_date date
) with (appendonly=true, compresslevel=5)
distributed by(member_id)
partition by range (dw_end_date)
(
    partition p20111201 start (date '2011-12-01') inclusive,
    partition p20111202 start (date '2011-12-02') inclusive,
    partition p20111203 start (date '2011-12-03') inclusive,
    partition p20111204 start (date '2011-12-04') inclusive,
    partition p20111205 start (date '2011-12-05') inclusive,
    partition p20111206 start (date '2011-12-06') inclusive,
    partition p20111207 start (date '2011-12-07') inclusive,
    partition p30001231 start (date '3000-12-31') inclusive
    end (date '3001-01-01') exclusive
);

(2) 增量表结构

create table public.member_delta (
    member_id varchar(64),
    phoneno varchar(64),
    action char(1),
    dw_ins_date date
) with (appendonly=true, compresslevel=5)
distributed by(member_id);

(3) 临时表结构

create table public.member_tmp0 (
    member_id varchar(64),
    phoneno varchar(64),
    dw_beg_date date,
    dw_end_date date,
    dtype char(1),
    dw_status char(1),
    dw_ins_date date
) with (appendonly=true, compresslevel=5)
distributed by(member_id)
partition by list (dtype)
(
    partition phis values('H'),
    partition pcur values('C'),
    default partition other
);

(4) 临时表结构

create table public.member_tmp1 (
    member_id varchar(64),
    phoneno varchar(64),
    dw_beg_date date,
    dw_end_date date,
    dtype char(1),
    dw_status char(1),
    dw_ins_date date
) with (appendonly=true, compresslevel=5)
distributed by(member_id);

数据导入

1. insert

insert into public.member_delta values('mem006', '13100000006', 'I', date'2011-12-03');
insert into public.member_delta values('mem002', '13100000002', 'D', date'2011-12-03');
insert into public.member_delta values('mem003', '13100000003', 'U', date'2011-12-03');

2. insert

mem001,13100000001,2011-12-01,3000-12-31,C,I,2011-12-01
mem002,13100000002,2011-12-01,3000-12-31,C,I,2011-12-01
mem003,13100000003,2011-12-01,3000-12-31,C,I,2011-12-01
mem004,13100000004,2011-12-01,3000-12-31,C,I,2011-12-01
mem005,13100000005,2011-12-01,3000-12-31,C,I,2011-12-01

copy public.member_fatdt0_1_prt_p30001231 from '/home/gpadmin/member_his_init.dat' with delimiter ',';

3. 外部表

首先，启动 gpfdist 服务

nohup gpfdist -d /home/gpadmin/data -p 8888 -l /home/gpadmin/data/gpfdist.log &

其次，创建外部表

drop external table if exists public.member_ext;
create external table public.member_ext (
    member_id varchar(64),
    phoneno varchar(64),
    action char(1),
    dw_ins_date date
) 
location ('gpfdist://localhost:8888/member_delta.dat')
format 'text' (delimiter ',' null as '' escape 'off')
encoding 'utf-8'
log errors into member_err segment reject limit 2 rows;

再编辑 /home/gpadmin/data/member_delta.dat 文件

mem001,13100000001,I,2011-12-01

最后，将外部表的数据加载到内部表

insert into public.member_delta select * from public.member_ext;

4. gpload

gpload 是对外部表的一层封装，首先编写 gpload 控制文件 gpload.yml，代码如下：

---  
VERSION: 1.0.0.1  
DATABASE: test  
USER: gpadmin  
HOST: localhost 
PORT: 5432  
GPLOAD:  
  INPUT:  
    - SOURCE:  
        LOCAL_HOSTNAME:  
          - master  
        PORT: 8888  
        FILE:  
          - /home/gpadmin/data/member_delta.dat
    - COLUMNS:  
        - member_id: varchar(64),
        - phoneno: varchar(20),
        - action: char(1),
        - dw_ins_date: date
    - FORMAT: text  
    - DELIMITER: ','  
    - ERROR_LIMIT: 2
    - ERROR_TABLE: public.member_err 
  OUTPUT:  
    - TABLE: public.member_delta  
    - MODE: INSERT  
  SQL:
    - BEFORE: "truncate table public.member_delta"
    - AFTER: "analyze public.member_delta"

执行 gpload 命令，结果如下：

gpload -f gpload.yml

2018-05-18 20:53:10|INFO|gpload session started 2018-05-18 20:53:10
2018-05-18 20:53:10|INFO|started gpfdist -p 8888 -P 8889 -f "/home/gpadmin/data/member_delta.dat" -t 30
2018-05-18 20:53:11|INFO|running time: 0.85 seconds
2018-05-18 20:53:11|INFO|rows Inserted          = 1
2018-05-18 20:53:11|INFO|rows Updated           = 0
2018-05-18 20:53:11|INFO|data formatting errors = 0
2018-05-18 20:53:11|INFO|gpload succeeded

5. 可执行的外部表

drop external table if exists public.member_ext;
create external web table public.member_ext (
    member_id varchar(64),
    phoneno varchar(64),
    action char(1),
    dw_ins_date date
) 
execute 'cat /home/gpadmin/data/member_delta.dat' on master
format 'text' (delimiter ',' null as '' escape 'off')
encoding 'utf-8';

create table public.test_partition_list (
member_id numeric,
city character varying(32)
) distributed by(member_id)
partition by list(city)
(
partition guangzhou values('guangzhou'),
partition hangzhou values('hangzhou'),
partition shanghai values('shanghai'),
partition beijing values('beijing'),
default partition other_city
);

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每天用心记录一点点。内容也许不重要，但习惯很重要！