KingbaseES分区表 -- 声明式创建分区表
一、声明式创建分区：
1. 创建分区表同时创建分区：
1.1 准备环境：
# 创建分区表同时创建分区
create table tb1(id bigint,stat date,no bigint,pdate date,info varchar2(50)) partition by range(pdate) INTERVAL ('1 MONTH'::INTERVAL)
(
PARTITION tb1_p1 VALUES LESS THAN ('2019-01-01'),
PARTITION tb1_p2 VALUES LESS THAN ('2019-02-01'),
PARTITION tb1_p3 VALUES LESS THAN ('2019-03-01'),
PARTITION tb1_p4 VALUES LESS THAN ('2019-04-01')
);
# 查看分区表父表
test=# \d+ tb1
Partitioned table "public.tb1"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+----------------------------+-----------+----------+---------+----------+--------------+-------------
id | bigint | | | | plain | |
stat | date | | | | plain | |
no | bigint | | | | plain | |
pdate | date | | | | plain | |
info | character varying(50 char) | | | | extended | |
Partition key: RANGE (pdate)
Range interval: INTERVAL ('0-1'::pg_catalog.interval)
Partitions: tb1_tb1_p1 FOR VALUES FROM (MINVALUE) TO ('2019-01-01 00:00:00'),
tb1_tb1_p2 FOR VALUES FROM ('2019-01-01 00:00:00') TO ('2019-02-01 00:00:00'),
tb1_tb1_p3 FOR VALUES FROM ('2019-02-01 00:00:00') TO ('2019-03-01 00:00:00'),
tb1_tb1_p4 FOR VALUES FROM ('2019-03-01 00:00:00') TO ('2019-04-01 00:00:00')
# 查看分区表子表
test=# \d+ tb1_tb1_p1
Table "public.tb1_tb1_p1"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+----------------------------+-----------+----------+---------+----------+--------------+-------------
id | bigint | | | | plain | |
stat | date | | | | plain | |
no | bigint | | | | plain | |
pdate | date | | | | plain | |
info | character varying(50 char) | | | | extended | |
Partition of: tb1 FOR VALUES FROM (MINVALUE) TO ('2019-01-01 00:00:00')
Partition constraint: ((pdate IS NOT NULL) AND ((pdate)::timestamp without time zone < '2019-01-01 00:00:00'::date))
Access method: heap
1.2 对分区表添加主键：
# 分区表添加主键
test=# alter table tb1 add constraint tb1_pk primary key(id);
ALTER TABLE
# 查看分区表父表
test=# \d+ tb1
Partitioned table "public.tb1"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+----------------------------+-----------+----------+---------+----------+--------------+-------------
id | bigint | | not null | | plain | |
stat | date | | | | plain | |
no | bigint | | | | plain | |
pdate | date | | | | plain | |
info | character varying(50 char) | | | | extended | |
Partition key: RANGE (pdate)
Range interval: INTERVAL ('0-1'::pg_catalog.interval)
Indexes:
"tb1_pk" PRIMARY KEY, btree (id) INCLUDE (tableoid) GLOBAL
Partitions: tb1_tb1_p1 FOR VALUES FROM (MINVALUE) TO ('2019-01-01 00:00:00'),
tb1_tb1_p2 FOR VALUES FROM ('2019-01-01 00:00:00') TO ('2019-02-01 00:00:00'),
tb1_tb1_p3 FOR VALUES FROM ('2019-02-01 00:00:00') TO ('2019-03-01 00:00:00'),
tb1_tb1_p4 FOR VALUES FROM ('2019-03-01 00:00:00') TO ('2019-04-01 00:00:00')
# 查看分区表子表
test=# \d+ tb1_tb1_p1
Table "public.tb1_tb1_p1"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+----------------------------+-----------+----------+---------+----------+--------------+-------------
id | bigint | | not null | | plain | |
stat | date | | | | plain | |
no | bigint | | | | plain | |
pdate | date | | | | plain | |
info | character varying(50 char) | | | | extended | |
Partition of: tb1 FOR VALUES FROM (MINVALUE) TO ('2019-01-01 00:00:00')
Partition constraint: ((pdate IS NOT NULL) AND ((pdate)::timestamp without time zone < '2019-01-01 00:00:00'::date))
Access method: heap
# 查询user_indexes视图tb1_pk索引
test=# select index_name,index_type,table_name,table_type,uniqueness,compression from user_indexes where index_name =upper('tb1_pk');
index_name | index_type | table_name | table_type | uniqueness | compression
------------+------------+------------+------------+------------+-------------
TB1_PK | BTREE | TB1 | TABLE | UNIQUE | DISABLED
(1 row)
分区表添加主键：
1 添加主键的同时会创建主键列（字段）唯一索引（但是有唯一索引的列不一定是主键）。
2 主键字段不允许空值，添加主键过程中会自动添加not null非空约束，保证主键列值的唯一性。
3 分区表添加主键同时创建的索引（索引有GLOBAL）是全局索引。
4 分区表会在主键列创建一个全局（global）索引，默认为添加主键列的同时创建全局索引。
5 分区表唯一约束必须包含分区键。
1.3 对分区表创建索引：
# 分区表创建索引
create index on tb1 (no) local;
CREATE INDEX
create index on tb1 (id,no) global;
CREATE INDEX
# 查看tb1表信息
test=# \d+ tb1
Partitioned table "public.tb1"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+----------------------------+-----------+----------+---------+----------+--------------+-------------
id | bigint | | not null | | plain | |
stat | date | | | | plain | |
no | bigint | | | | plain | |
pdate | date | | | | plain | |
info | character varying(50 char) | | | | extended | |
Partition key: RANGE (pdate)
Range interval: INTERVAL ('0-1'::pg_catalog.interval)
Indexes:
"tb1_pk" PRIMARY KEY, btree (id) INCLUDE (tableoid) GLOBAL
"tb1_id_no_idx" btree (id, no)
"tb1_no_idx" btree (no)
Partitions: tb1_tb1_p1 FOR VALUES FROM (MINVALUE) TO ('2019-01-01 00:00:00'),
tb1_tb1_p2 FOR VALUES FROM ('2019-01-01 00:00:00') TO ('2019-02-01 00:00:00'),
tb1_tb1_p3 FOR VALUES FROM ('2019-02-01 00:00:00') TO ('2019-03-01 00:00:00'),
tb1_tb1_p4 FOR VALUES FROM ('2019-03-01 00:00:00') TO ('2019-04-01 00:00:00')
# 查看分区表tb1子表信息
test=# \d+ tb1_tb1_p2
Table "public.tb1_tb1_p2"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+----------------------------+-----------+----------+---------+----------+--------------+-------------
id | bigint | | not null | | plain | |
stat | date | | | | plain | |
no | bigint | | | | plain | |
pdate | date | | | | plain | |
info | character varying(50 char) | | | | extended | |
Partition of: tb1 FOR VALUES FROM ('2019-01-01 00:00:00') TO ('2019-02-01 00:00:00')
Partition constraint: (((pdate IS NULL) OR ((pdate)::timestamp without time zone >= '2019-01-01 00:00:00'::date)) AND ((pdate IS NOT NULL) AND ((pdate)::timestamp without time zone < '2019-02-01 00:00:00'::date)))
Indexes:
"tb1_tb1_p2_id_no_idx" btree (id, no)
"tb1_tb1_p2_no_idx" btree (no)
Access method: heap
分区表创建索引：
1 在分区表创建本地索引，会自动在每个分区上创建一个本地索引。
2 分区表只能在主键列创建一个全局（global）索引，默认为添加主键列创建的索引。
3 分区表创建全局索引必须满足条件：索引类型是唯一索引（unique）并且不包含分区键 。
4 分区表父表不支持CONCURRENTLY、parallel_workers选项，子分区支持CONCURRENTLY、parallel_workers选项。
1.4 使用ATTACH PARTITION将普通表转换为分区表子分区：
# 创建普通表
test=# create table tb1_tb1_p5(id bigint,stat date,no bigint,pdate date,info varchar2(50));
CREATE TABLE
test=# \d+ tb1_tb1_p5
Table "public.tb1_tb1_p5"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+----------------------------+-----------+----------+---------+----------+--------------+-------------
id | bigint | | | | plain | |
stat | date | | | | plain | |
no | bigint | | | | plain | |
pdate | date | | | | plain | |
info | character varying(50 char) | | | | extended | |
Access method: heap
# 使用ATTACH PARTITION将普通表转换为分区表子分区
test=# alter table tb1 ATTACH PARTITION tb1_tb1_p5 for VALUES FROM('2019-05-01') TO ('2019-05-31');
ERROR: column "id" in child table must be marked NOT NULL
# 创建的普通表，表结构、约束必须跟分区表一致
test=# alter table tb1_tb1_p5 alter id set not null;
ALTER TABLE
test=# \d+ tb1_tb1_p5
Table "public.tb1_tb1_p5"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+----------------------------+-----------+----------+---------+----------+--------------+-------------
id | bigint | | not null | | plain | |
stat | date | | | | plain | |
no | bigint | | | | plain | |
pdate | date | | | | plain | |
info | character varying(50 char) | | | | extended | |
Access method: heap
test=# alter table tb1 ATTACH PARTITION tb1_tb1_p5 for VALUES FROM('2019-05-01') TO ('2019-05-31');
ALTER TABLE
# 查看ATTACH后的分区表
test=# \d+ tb1
Partitioned table "public.tb1"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+----------------------------+-----------+----------+---------+----------+--------------+-------------
id | bigint | | not null | | plain | |
stat | date | | | | plain | |
no | bigint | | | | plain | |
pdate | date | | | | plain | |
info | character varying(50 char) | | | | extended | |
Partition key: RANGE (pdate)
Range interval: INTERVAL ('0-1'::pg_catalog.interval)
Indexes:
"tb1_pk" PRIMARY KEY, btree (id) INCLUDE (tableoid) GLOBAL
"tb1_id_no_idx" btree (id, no)
"tb1_no_idx" btree (no)
Partitions: tb1_tb1_p1 FOR VALUES FROM (MINVALUE) TO ('2019-01-01 00:00:00'),
tb1_tb1_p2 FOR VALUES FROM ('2019-01-01 00:00:00') TO ('2019-02-01 00:00:00'),
tb1_tb1_p3 FOR VALUES FROM ('2019-02-01 00:00:00') TO ('2019-03-01 00:00:00'),
tb1_tb1_p4 FOR VALUES FROM ('2019-03-01 00:00:00') TO ('2019-04-01 00:00:00'),
tb1_tb1_p5 FOR VALUES FROM ('2019-05-01 00:00:00') TO ('2019-05-31 00:00:00')
test=# \d+ tb1_tb1_p5
Table "public.tb1_tb1_p5"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+----------------------------+-----------+----------+---------+----------+--------------+-------------
id | bigint | | not null | | plain | |
stat | date | | | | plain | |
no | bigint | | | | plain | |
pdate | date | | | | plain | |
info | character varying(50 char) | | | | extended | |
Partition of: tb1 FOR VALUES FROM ('2019-05-01 00:00:00') TO ('2019-05-31 00:00:00')
Partition constraint: (((pdate IS NULL) OR ((pdate)::timestamp without time zone >= '2019-05-01 00:00:00'::date)) AND ((pdate IS NOT NULL) AND ((pdate)::timestamp without time zone < '2019-05-31 00:00:00'::date)))
Indexes:
"tb1_tb1_p5_id_no_idx" btree (id, no)
"tb1_tb1_p5_no_idx" btree (no)
Access method: heap
ATTACH PARTITION将普通表转换为分区表子分区：
1 ATTACH普通表、分区表的列、字段类型、长度、约束必须一致。
2 分区表的unique和primary key约束将被应用在ATTACH新的子分区。
3 ATTACH过程中如果普通表有数据，会使用全表扫描检查数据是否违反分区约束（可以在ATTACH前使用约束筛选复合条件的数据）。
4 ATTACH外部表，不需要验证外部表中的数据符合分区约束。
5 如果ATTACH的表有跟分区不一致的索引，分区表会应用ATTACH表的索引。
2. 使用Create Table为分区表添加子分区：
使用Create Table语句创建分区表子分区也会自动添加约束及索引。
# 使用Create Table语句创建分区表子分区
test=# CREATE TABLE tb1_tb1_p5 PARTITION OF tb1 FOR VALUES FROM ('2019-04-01') TO ('2019-04-30');
CREATE TABLE
test=# \d+ tb1
Partitioned table "public.tb1"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+----------------------------+-----------+----------+---------+----------+--------------+-------------
id | bigint | | not null | | plain | |
stat | date | | | | plain | |
no | bigint | | | | plain | |
pdate | date | | | | plain | |
info | character varying(50 char) | | | | extended | |
Partition key: RANGE (pdate)
Range interval: INTERVAL ('0-1'::pg_catalog.interval)
Indexes:
"tb1_pk" PRIMARY KEY, btree (id) INCLUDE (tableoid) GLOBAL
"tb1_id_no_idx" btree (id, no)
"tb1_no_idx" btree (no)
Partitions: tb1_tb1_p1 FOR VALUES FROM (MINVALUE) TO ('2019-01-01 00:00:00'),
tb1_tb1_p2 FOR VALUES FROM ('2019-01-01 00:00:00') TO ('2019-02-01 00:00:00'),
tb1_tb1_p3 FOR VALUES FROM ('2019-02-01 00:00:00') TO ('2019-03-01 00:00:00'),
tb1_tb1_p4 FOR VALUES FROM ('2019-03-01 00:00:00') TO ('2019-04-01 00:00:00'),
tb1_tb1_p5 FOR VALUES FROM ('2019-04-01 00:00:00') TO ('2019-04-30 00:00:00')
test=# \d+ tb1_tb1_p5
Table "public.tb1_tb1_p5"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+----------------------------+-----------+----------+---------+----------+--------------+-------------
id | bigint | | not null | | plain | |
stat | date | | | | plain | |
no | bigint | | | | plain | |
pdate | date | | | | plain | |
info | character varying(50 char) | | | | extended | |
Partition of: tb1 FOR VALUES FROM ('2019-04-01 00:00:00') TO ('2019-04-30 00:00:00')
Partition constraint: (((pdate IS NULL) OR ((pdate)::timestamp without time zone >= '2019-04-01 00:00:00'::date)) AND ((pdate IS NOT NULL) AND ((pdate)::timestamp without time zone < '2019-04-30 00:00:00'::date)))
Indexes:
"tb1_tb1_p5_id_no_idx" btree (id, no)
"tb1_tb1_p5_no_idx" btree (no)
Access method: heap
3. 申明式创建分区总结：
声明式分区，子分区和分区表列、类型、约束必须一致。
在申明式创建的分区表上创建索引，会自动将索引应用于所有的子分区。
分区表惟一约束必须包括分区键。
不能创建包含所有子分区的排除约束，只能每个子分区单独创建。
在分区表创建索引时（不可使用CONCURRENTLY），可使用on only在分区表创建标记失效的索引，避免大表创建索引耗时太久（子分区不会自动应用该索引），然后在所有子分区单独创建索引（可使用CONCURRENTLY），最后使用ALTER INDEX .. ATTACH PARTITION附加到到父索引，所有子分区索引附加到父索引后会自动标记为有效。
# 分区表不支持使用CONCURRENTLY在父表创建索引
test=# create index CONCURRENTLY on tb1(info);
ERROR: cannot create index on partitioned table "tb1" concurrently
Time: 0.519 ms
# 使用on only在分区表创建索引
test=# create index on only tb1(info);
CREATE INDEX
Time: 1.845 ms
# 查看分区表tb1信息，tb1_info_idx标记为无效invalid
test=# \d+ tb1
Partitioned table "public.tb1"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+----------------------------+-----------+----------+---------+----------+--------------+-------------
id | bigint | | not null | | plain | |
stat | date | | | | plain | |
no | bigint | | | | plain | |
pdate | date | | | | plain | |
info | character varying(50 char) | | | | extended | |
Partition key: RANGE (pdate)
Range interval: INTERVAL ('0-1'::pg_catalog.interval)
Indexes:
"tb1_pk" PRIMARY KEY, btree (id) INCLUDE (tableoid) GLOBAL
"tb1_id_no_idx" btree (id, no)
"tb1_info_idx" btree (info) INVALID
"tb1_no_idx" btree (no)
Partitions: tb1_tb1_p1 FOR VALUES FROM (MINVALUE) TO ('2019-01-01 00:00:00'),
tb1_tb1_p2 FOR VALUES FROM ('2019-01-01 00:00:00') TO ('2019-02-01 00:00:00'),
tb1_tb1_p3 FOR VALUES FROM ('2019-02-01 00:00:00') TO ('2019-03-01 00:00:00'),
tb1_tb1_p4 FOR VALUES FROM ('2019-03-01 00:00:00') TO ('2019-04-01 00:00:00'),
tb1_tb1_p5 FOR VALUES FROM ('2019-04-01 00:00:00') TO ('2019-04-30 00:00:00')
# 单独创建所有子分区索引
test=# create index tb1_tb1_p1_info_idx on tb1_tb1_p1(info);
CREATE INDEX
test=# create index tb1_tb1_p2_info_idx on tb1_tb1_p2(info);
CREATE INDEX
test=# create index tb1_tb1_p3_info_idx on tb1_tb1_p3(info);
CREATE INDEX
test=# create index tb1_tb1_p4_info_idx on tb1_tb1_p4(info);
CREATE INDEX
test=# create index tb1_tb1_p5_info_idx on tb1_tb1_p5(info);
CREATE INDEX
# 使用attach partition将所有子分区索引附加到父表
test=# alter index tb1_info_idx attach partition tb1_tb1_p1_info_idx;
ALTER INDEX
test=# alter index tb1_info_idx attach partition tb1_tb1_p2_info_idx;
ALTER INDEX
test=# alter index tb1_info_idx attach partition tb1_tb1_p3_info_idx;
ALTER INDEX
test=# alter index tb1_info_idx attach partition tb1_tb1_p4_info_idx;
ALTER INDEX
test=# alter index tb1_info_idx attach partition tb1_tb1_p5_info_idx;
ALTER INDEX
# 查看分区表tb1信息，tb1_info_idx自动标记为有效
test=# \d+ tb1
Partitioned table "public.tb1"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+----------------------------+-----------+----------+---------+----------+--------------+-------------
id | bigint | | not null | | plain | |
stat | date | | | | plain | |
no | bigint | | | | plain | |
pdate | date | | | | plain | |
info | character varying(50 char) | | | | extended | |
Partition key: RANGE (pdate)
Range interval: INTERVAL ('0-1'::pg_catalog.interval)
Indexes:
"tb1_pk" PRIMARY KEY, btree (id) INCLUDE (tableoid) GLOBAL
"tb1_id_no_idx" btree (id, no)
"tb1_info_idx" btree (info)
"tb1_no_idx" btree (no)
Partitions: tb1_tb1_p1 FOR VALUES FROM (MINVALUE) TO ('2019-01-01 00:00:00'),
tb1_tb1_p2 FOR VALUES FROM ('2019-01-01 00:00:00') TO ('2019-02-01 00:00:00'),
tb1_tb1_p3 FOR VALUES FROM ('2019-02-01 00:00:00') TO ('2019-03-01 00:00:00'),
tb1_tb1_p4 FOR VALUES FROM ('2019-03-01 00:00:00') TO ('2019-04-01 00:00:00'),
tb1_tb1_p5 FOR VALUES FROM ('2019-04-01 00:00:00') TO ('2019-04-30 00:00:00')
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