Greeplum 系列（四）实战

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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

);