Greenplum6 数据库数据库学习_分区表
2021-04-15 00:14
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Greenplum 分区原理
分区表意思是将一个大表在物理上分割成几块，GPDB中的分区表和PostgreSQL中实现原理一样，都是用过表继承、约束来实现。但是与PostgreSQL也有所不同，在PostgreSQL中，一个父表，多个子表来实现分区表，需要手动向子表插入数据，如果向父表插入数据，则直接会被插入到父表中，在GPDB中，可以直接想父表插入数据，便可以根据约束直接自动向对应的子表插入数据，当分区子表不存在时，插入失败
语法
[PARTITION BY partition_type (column) [SUBPARTITION BY partition_type (column)] [SUBPARTITION TEMPLATE (template_spec)] [...] (partition_spec) |[SUBPARTITION BY partition_type(column)] [...] (partition_spec) [(subpartition_spec [(...)] )] ] and partition_element is: DEFAULT PARTITION name | [PARTITION name] VALUES (list_value[,...]) | [PARTITION name] START ([datatype] 'start_value') [INCLUSIVE|EXCLUSIVE] [ END ([datatype] 'end_value') [INCLUSIVE|EXCLUSIVE] [ EVERY ([datatype] [number|INTERVAL] 'interval_value')] | [PARTITION name] END ([DATATYPE] 'end_value') [INCLUSIVE|EXCLUSIVE] [ EVERY ([datatype] [number|INTERVAL] 'interval_value')] [ with (partition_storage_parameter=value [,...])] [ TABLESPACE tablespace]
普通分区
range分区
create table public.test_partition_range(
id numeric,
name character varying(32),
dw_end_date date
) distributed by (id)
PARTITION BY range(dw_end_date)
(
PARTITION p20201230 START ('2020-12-30'::date) END ('2020-12-31'::date),
PARTITION p20201231 START ('2020-12-31'::date) END ('2021-01-01'::date),
PARTITION p20210101 START ('2021-01-01'::date) END ('2021-01-02'::date),
PARTITION p20210102 START ('2021-01-02'::date) END ('2021-01-03'::date),
PARTITION p20210103 START ('2021-01-03'::date) END ('2021-01-04'::date),
PARTITION p20210104 START ('2021-01-04'::date) END ('2021-01-05'::date),
PARTITION p20210105 START ('2021-01-05'::date) END ('2021-01-06'::date)
);
create table test_partition_range1
(
id int,
name varchar(64),
fdate varchar(64)
) distributed by (id)
partition by range(fdate)
(
partition p1 start ('2017-01-01') inclusive end ('2017-01-31') exclusive,
partition p2 start ('2017-02-01') inclusive end ('2017-02-29') exclusive,
default partition default_p
);
create table test_partition_range
(
id int,
name varchar(64),
fdate varchar(64)
) distributed by (id)
partition by range(fdate)
(
partition p1 start ('2017-01-01') inclusive end ('2017-01-31') exclusive,
partition p2 start ('2017-02-01') inclusive end ('2017-02-29') exclusive,
default partition default_p
);
inclusive ：指定包含，例如上面的 start ('2017-01-01') inclusive 则是包含'2017-01-01'
exclusive ： 指定不包含， 例如上面的 end ('2017-01-31') exclusive 则是不包含'2017-01-31'
执行结果显示
testDB=# create table public.test_partition_range(
testDB(# id numeric,
testDB(# name character varying(32),
testDB(# dw_end_date date
testDB(# ) distributed by (id)
testDB-# PARTITION BY range(dw_end_date)
testDB-# (
testDB(# PARTITION p20201230 START ('2020-12-30'::date) END ('2020-12-31'::date),
testDB(# PARTITION p20201231 START ('2020-12-31'::date) END ('2021-01-01'::date),
testDB(# PARTITION p20210101 START ('2021-01-01'::date) END ('2021-01-02'::date),
testDB(# PARTITION p20210102 START ('2021-01-02'::date) END ('2021-01-03'::date),
testDB(# PARTITION p20210103 START ('2021-01-03'::date) END ('2021-01-04'::date),
testDB(# PARTITION p20210104 START ('2021-01-04'::date) END ('2021-01-05'::date),
testDB(# PARTITION p20210105 START ('2021-01-05'::date) END ('2021-01-06'::date)
testDB(# );
NOTICE: CREATE TABLE will create partition "test_partition_range_1_prt_p20201230" for table "test_partition_range"
NOTICE: CREATE TABLE will create partition "test_partition_range_1_prt_p20201231" for table "test_partition_range"
NOTICE: CREATE TABLE will create partition "test_partition_range_1_prt_p20210101" for table "test_partition_range"
NOTICE: CREATE TABLE will create partition "test_partition_range_1_prt_p20210102" for table "test_partition_range"
NOTICE: CREATE TABLE will create partition "test_partition_range_1_prt_p20210103" for table "test_partition_range"
NOTICE: CREATE TABLE will create partition "test_partition_range_1_prt_p20210104" for table "test_partition_range"
NOTICE: CREATE TABLE will create partition "test_partition_range_1_prt_p20210105" for table "test_partition_range"
CREATE TABLE
testDB=# create table test_partition_range1
testDB-# (
testDB(# id int,
testDB(# name varchar(64),
testDB(# fdate varchar(64)
testDB(# ) distributed by (id)
testDB-# partition by range(fdate)
testDB-# (
testDB(# partition p1 start ('2017-01-01') inclusive end ('2017-01-31') exclusive,
testDB(# partition p2 start ('2017-02-01') inclusive end ('2017-02-29') exclusive,
testDB(# default partition default_p
testDB(# );
NOTICE: CREATE TABLE will create partition "test_partition_range1_1_prt_default_p" for table "test_partition_range1"
NOTICE: CREATE TABLE will create partition "test_partition_range1_1_prt_p1" for table "test_partition_range1"
NOTICE: CREATE TABLE will create partition "test_partition_range1_1_prt_p2" for table "test_partition_range1"
CREATE TABLE
every range分区（快速分区（every））
create table public.test_partition_every(
id numeric,
name character varying(32),
dw_end_date date
) distributed by(id)
partition by range(dw_end_Date)
(
partition p202012 start('2020-12-1'::date) end ('2021-12-31'::date)
every ('1 days'::interval)
);
eg:根据选定的范围，跨越基数，快速分区每一个子表
create table test_partition_every_1
(
id int,
name varchar(64),
fdate date
)
distributed by (id)
partition by range (fdate)
(
partition pn_ start ('2017-01-01'::date) end ('2017-12-31'::date) every ('1 day'::interval),
default partition default_p
);
every：指定跨越基数
执行结果显示
testDB=# create table public.test_partition_every(
testDB(# id numeric,
testDB(# name character varying(32),
testDB(# dw_end_date date
testDB(# ) distributed by(id)
testDB-# partition by range(dw_end_Date)
testDB-# (
testDB(# partition p202012 start('2020-12-1'::date) end ('2020-12-31'::date)
testDB(# every ('1 days'::interval)
testDB(# );
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_1" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_2" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_3" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_4" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_5" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_6" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_7" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_8" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_9" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_10" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_11" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_12" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_13" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_14" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_15" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_16" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_17" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_18" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_19" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_20" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_21" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_
8000
1_prt_p202012_22" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_23" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_24" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_25" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_26" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_27" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_28" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_29" for table "test_partition_every"
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p202012_30" for table "test_partition_every"
CREATE TABLE
list 分区
根据值的分组，相同的数据归类到一组，也就一个分区中
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'),
default partition other_city
);
create table test_partition_list
(
id int,
name varchar(64),
fdate varchar(10)
)
distributed by (id)
partition by list (fdate)
(
partition p1 values ('2017-01-01', '2017-01-02'),
partition p2 values ('2017-01-03'),
default partition pd
);
执行结果显示
testDB=# create table test_partition_range
testDB-# (
testDB(# id int,
testDB(# name varchar(64),
testDB(# fdate varchar(64)
testDB(# ) distributed by (id)
testDB-# partition by range(fdate)
testDB-# (
testDB(# partition p1 start ('2017-01-01') inclusive end ('2017-01-31') exclusive,
testDB(# partition p2 start ('2017-02-01') inclusive end ('2017-02-29') exclusive,
testDB(# default partition default_p
testDB(# );
NOTICE: CREATE TABLE will create partition "test_partition_range_1_prt_default_p" for table "test_partition_range"
NOTICE: CREATE TABLE will create partition "test_partition_range_1_prt_p1" for table "test_partition_range"
NOTICE: CREATE TABLE will create partition "test_partition_range_1_prt_p2" for table "test_partition_range"
CREATE TABLE
修改分区表语法
ALTER DEFAULT PARTITION
DROP DEFAULT PARTITION [IF EXISTS]
DROP PARTITION [IF EXISTS] {
partition_name
| FOR (RANK(number))
| FOR (value)
}
[CASCADE]
TRUNCATE DEFAULT PARTITION
TRUNCATE PARTITION {
partition_name
| FOR (RANK(number))
| FOR (value)
}
RENAME DEFAULT PARTITION TO new_partition_name
RENAME PARTITION {
partition_name
| FOR (RANK(number))
| FOR (value)
}
TO new_partition_name
ADD DEFAULT PARTITION NAME [(subpartition_spec)]
ADD PARTITION [name] partition_element
[(subpartition_spec)]
EXCHANGE PARTITION {
partition_name
| FOR (RANK(number))
| FOR (value)
} WITH TABLE TABLE_NAME
[WITH|WITHOUT VALIDATION]
EXCHANGE EFAULT PARTITION WITH TABLE TABLE_NAME
[WITH|WITHOUT VALIDATION]
SET SUBPARTITION TEMPLATE (subpartition_spec)
SPLIT DEFAULT PARTITION {
AT (list_value)
|START([datatype] range_value) [INCLUSIVE|EXCLUSIVE]
END ([datatype]) range_value) [INCLUSIVE|EXCLUSIVE]
}
[INTO (PARTITION new_partition_name,
PARTITION default_partition_name)]
SPLIT DPARTITION {
partition_name
| FOR (RANK(number))
| FOR (value)
} AT(value)
[INTO (PARTITION partition_name, PARTITION partition_name]
新增分区表/drop分区表/truncate分区表
alter table public.test_partition_every add partition p20210205_6 start ('2012-02-05'::date) END ('2012-01-07'::date);
alter table public.test_partition_every drop partition p20120105_6;
alter table public.test_partition_every truncate partition p20120205_6;
添加分区操作步骤
testDB=# alter table public.test_partition_every add partition p20210105_6 start ('2012-01-05'::date) END ('2012-01-07'::date);
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p20210105_6" for table "test_partition_every"
ALTER TABLE
testDB=# select gp_segment_id,tableoid::regclass,count(*) from test_partition_every group by 1,2 order by 1,2;
gp_segment_id | tableoid | count
---------------+----------+-------
(0 rows)
testDB=# \d+ public.test_partition_every
Table "public.test_partition_every"
Column | Type | Modifiers | Storage | Stats target | Description
-------------+-----------------------+-----------+----------+--------------+-------------
id | numeric | | main | |
name | character varying(32) | | extended | |
dw_end_date | date | | plain | |
Child tables: test_partition_every_1_prt_p202012_1,
test_partition_every_1_prt_p202012_10,
test_partition_every_1_prt_p202012_11,
test_partition_every_1_prt_p202012_12,
test_partition_every_1_prt_p202012_13,
test_partition_every_1_prt_p202012_14,
test_partition_every_1_prt_p202012_15,
test_partition_every_1_prt_p202012_16,
test_partition_every_1_prt_p202012_17,
test_partition_every_1_prt_p202012_18,
test_partition_every_1_prt_p202012_19,
test_partition_every_1_prt_p202012_2,
test_partition_every_1_prt_p202012_20,
test_partition_every_1_prt_p202012_21,
test_partition_every_1_prt_p202012_22,
test_partition_every_1_prt_p202012_23,
test_partition_every_1_prt_p202012_24,
test_partition_every_1_prt_p202012_25,
test_partition_every_1_prt_p202012_26,
test_partition_every_1_prt_p202012_27,
test_partition_every_1_prt_p202012_28,
test_partition_every_1_prt_p202012_29,
test_partition_every_1_prt_p202012_3,
test_partition_every_1_prt_p202012_30,
test_partition_every_1_prt_p202012_31,
test_partition_every_1_prt_p202012_32,
test_partition_every_1_prt_p202012_33,
test_partition_every_1_prt_p202012_34,
test_partition_every_1_prt_p202012_35,
test_partition_every_1_prt_p202012_36,
test_partition_every_1_prt_p202012_37,
test_partition_every_1_prt_p202012_38,
test_partition_every_1_prt_p202012_39,
test_partition_every_1_prt_p202012_4,
test_partition_every_1_prt_p202012_40,
test_partition_every_1_prt_p202012_41,
test_partition_every_1_prt_p202012_42,
test_partition_every_1_prt_p202012_43,
test_partition_every_1_prt_p202012_44,
test_partition_every_1_prt_p202012_45,
test_partition_every_1_prt_p202012_46,
test_partition_every_1_prt_p202012_47,
test_partition_every_1_prt_p202012_48,
test_partition_every_1_prt_p202012_49,
test_partition_every_1_prt_p202012_5,
test_partition_every_1_prt_p202012_50,
test_partition_every_1_prt_p202012_51,
test_partition_every_1_prt_p202012_52,
test_partition_every_1_prt_p202012_53,
test_partition_every_1_prt_p202012_54,
test_partition_every_1_prt_p202012_55,
test_partition_every_1_prt_p202012_56,
test_partition_every_1_prt_p202012_57,
test_partition_every_1_prt_p202012_58,
test_partition_every_1_prt_p202012_59,
test_partition_every_1_prt_p202012_6,
test_partition_every_1_prt_p202012_60,
test_partition_every_1_prt_p202012_61,
test_partition_every_1_prt_p202012_7,
test_partition_every_1_prt_p202012_8,
test_partition_every_1_prt_p202012_9,
test_partition_every_1_prt_p20210105_6
Distributed by: (id)
Partition by: (dw_end_date)
testDB=# alter table public.test_partition_every drop partition p20210105_6;
ALTER TABLE
testDB=# alter table public.test_partition_every add partition p20210205_6 start ('2012-02-05'::date) END ('2012-01-07'::date);
ERROR: START greater than END for partition "p20210205_6"
testDB=# alter table public.test_partition_every add partition p20210205_6 start ('2012-02-05'::date) END ('2012-02-07'::date);
NOTICE: CREATE TABLE will create partition "test_partition_every_1_prt_p20210205_6" for table "test_partition_every"
ALTER TABLE
testDB=# \d+ public.test_partition_every
Table "public.test_partition_every"
Column | Type | Modifiers | Storage | Stats target | Description
-------------+-----------------------+-----------+----------+--------------+-------------
id | numeric | | main | |
name | character varying(32) | | extended | |
dw_end_date | date | | plain | |
Child tables: test_partition_every_1_prt_p202012_1,
test_partition_every_1_prt_p202012_10,
test_partition_every_1_prt_p202012_11,
test_partition_every_1_prt_p202012_12,
test_partition_every_1_prt_p202012_13,
test_partition_every_1_prt_p202012_14,
test_partition_every_1_prt_p202012_15,
test_partition_every_1_prt_p202012_16,
test_partition_every_1_prt_p202012_17,
test_partition_every_1_prt_p202012_18,
test_partition_every_1_prt_p202012_19,
test_partition_every_1_prt_p202012_2,
test_partition_every_1_prt_p202012_20,
test_partition_every_1_prt_p202012_21,
test_partition_every_1_prt_p202012_22,
test_partition_every_1_prt_p202012_23,
test_partition_every_1_prt_p202012_24,
test_partition_every_1_prt_p202012_25,
test_partition_every_1_prt_p202012_26,
test_partition_every_1_prt_p202012_27,
test_partition_every_1_prt_p202012_28,
test_partition_every_1_prt_p202012_29,
test_partition_every_1_prt_p202012_3,
test_partition_every_1_prt_p202012_30,
test_partition_every_1_prt_p202012_31,
test_partition_every_1_prt_p202012_32,
test_partition_every_1_prt_p202012_33,
test_partition_every_1_prt_p202012_34,
test_partition_every_1_prt_p202012_35,
test_partition_every_1_prt_p202012_36,
test_partition_every_1_prt_p202012_37,
test_partition_every_1_prt_p202012_38,
test_partition_every_1_prt_p202012_39,
test_partition_every_1_prt_p202012_4,
test_partition_every_1_prt_p202012_40,
test_partition_every_1_prt_p202012_41,
test_partition_every_1_prt_p202012_42,
test_partition_every_1_prt_p202012_43,
test_partition_every_1_prt_p202012_44,
test_partition_every_1_prt_p202012_45,
test_partition_every_1_prt_p202012_46,
test_partition_every_1_prt_p202012_47,
test_partition_every_1_prt_p202012_48,
test_partition_every_1_prt_p202012_49,
test_partition_every_1_prt_p202012_5,
test_partition_every_1_prt_p202012_50,
test_partition_every_1_prt_p202012_51,
test_partition_every_1_prt_p202012_52,
test_partition_every_1_prt_p202012_53,
test_partition_every_1_prt_p202012_54,
test_partition_every_1_prt_p202012_55,
test_partition_every_1_prt_p202012_56,
test_partition_every_1_prt_p202012_57,
test_partition_every_1_prt_p202012_58,
test_partition_every_1_prt_p202012_59,
test_partition_every_1_prt_p202012_6,
test_partition_every_1_prt_p202012_60,
test_partition_every_1_prt_p202012_61,
test_partition_every_1_prt_p202012_7,
test_partition_every_1_prt_p202012_8,
test_partition_every_1_prt_p202012_9,
test_partition_every_1_prt_p20210205_6
Distributed by: (id)
Partition by: (dw_end_date)
truncate 只会清理，不会删除
testDB=# alter table public.test_partition_every truncate partition p20210205_6;
ALTER TABLE
testDB=#
testDB=# \d+ public.test_partition_every
Table "public.test_partition_every"
Column | Type | Modifiers | Storage | Stats target | Description
-------------+-----------------------+-----------+----------+--------------+-------------
id | numeric | | main | |
name | character varying(32) | | extended | |
dw_end_date | date | | plain | |
Child tables: test_partition_every_1_prt_p202012_1,
test_partition_every_1_prt_p202012_10,
test_partition_every_1_prt_p202012_11,
test_partition_every_1_prt_p202012_12,
test_partition_every_1_prt_p202012_13,
test_partition_every_1_prt_p202012_14,
test_partition_every_1_prt_p202012_15,
test_partition_every_1_prt_p202012_16,
test_partition_every_1_prt_p202012_17,
test_partition_every_1_prt_p202012_18,
test_partition_every_1_prt_p202012_19,
test_partition_every_1_prt_p202012_2,
test_partition_every_1_prt_p202012_20,
test_partition_every_1_prt_p202012_21,
test_partition_every_1_prt_p202012_22,
test_partition_every_1_prt_p202012_23,
test_partition_every_1_prt_p202012_24,
test_partition_every_1_prt_p202012_25,
test_partition_every_1_prt_p202012_26,
test_partition_every_1_prt_p202012_27,
test_partition_every_1_prt_p202012_28,
test_partition_every_1_prt_p202012_29,
test_partition_every_1_prt_p202012_3,
test_partition_every_1_prt_p202012_30,
test_partition_every_1_prt_p202012_31,
test_partition_every_1_prt_p202012_32,
test_partition_every_1_prt_p202012_33,
test_partition_every_1_prt_p202012_34,
test_partition_every_1_prt_p202012_35,
test_partition_every_1_prt_p202012_36,
test_partition_every_1_prt_p202012_37,
test_partition_every_1_prt_p202012_38,
test_partition_every_1_prt_p202012_39,
test_partition_every_1_prt_p202012_4,
test_partition_every_1_prt_p202012_40,
test_partition_every_1_prt_p202012_41,
test_partition_every_1_prt_p202012_42,
test_partition_every_1_prt_p202012_43,
test_partition_every_1_prt_p202012_44,
test_partition_every_1_prt_p202012_45,
test_partition_every_1_prt_p202012_46,
test_partition_every_1_prt_p202012_47,
test_partition_every_1_prt_p202012_48,
test_partition_every_1_prt_p202012_49,
test_partition_every_1_prt_p202012_5,
test_partition_every_1_prt_p202012_50,
test_partition_every_1_prt_p202012_51,
test_partition_every_1_prt_p202012_52,
test_partition_every_1_prt_p202012_53,
test_partition_every_1_prt_p202012_54,
test_partition_every_1_prt_p202012_55,
test_partition_every_1_prt_p202012_56,
test_partition_every_1_prt_p202012_57,
test_partition_every_1_prt_p202012_58,
test_partition_every_1_prt_p202012_59,
test_partition_every_1_prt_p202012_6,
test_partition_every_1_prt_p202012_60,
test_partition_every_1_prt_p202012_61,
test_partition_every_1_prt_p202012_7,
test_partition_every_1_prt_p202012_8,
test_partition_every_1_prt_p202012_9,
test_partition_every_1_prt_p20210205_6
Distributed by: (id)
Partition by: (dw_end_date)
testDB=#
交换分区
不太熟悉
分区split
切割普通分区：
将分区p2 在 '2017-02-20' 左右切分成两块
alter table test_partition_range split partition p2 at ('2017-02-20') into (partition p2, partition p3);
切割默认分区：
alter table test_partition_range split default partition start ('2017-03-01') end ('2017-03-31') into (partition p4, default partition);
子分区创建与操作
在GPDB中，分区是可以嵌套增加的，分区下面可以有子分区
create table test_partition_range_2
(
id int,
name varchar(64),
fdate varchar(10)
)
distributed by (id)
partition by range(fdate)
subpartition by list(name)
subpartition template
(
subpartition c1 values ('xiaoxiao'),
subpartition c2 values ('xiaohua')
)
(
partition p1 start ('2017-01-01') end ('2017-01-31')
)
上面的分区中，p1会再分两个c1/c2子分区
truncate 子分区
alter table test_partition_range_2 alter partition p1 truncate partition c2;
drop 子分区
alter table test_partition_range_2 alter partition p1 drop partition c2;
写的不错的博客
https://blog.51cto.com/u_13126942/2053712
https://www.cnblogs.com/kingle-study/p/10550987.html
参考文档
http://greenplum.org/docs/510/ref_guide/sql_commands/ALTER_TABLE.html
http://www.dbaref.com/choosing-the-table-storage-model-in-greenplum
https://github.com/digoal/blog/blob/master/201708/20170817_01.md
https://github.com/digoal/blog/blob/master/201708/20170817_03.md
https://github.com/digoal/blog/blob/master/201708/20170818_02.md
https://github.com/digoal/blog/blob/master/201607/20160719_02.md
https://github.com/digoal/blog/blob/master/201711/20171123_01.md
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