PostgreSQL12.5中分區(qū)表的一些操作實(shí)例
1、創(chuàng)建一個(gè)有DEFAULT的分區(qū)表
1、先創(chuàng)建主表
create table tbl_log ( id serial, create_time timestamp(0) without time zone, remark char(1) ) PARTITION BY RANGE (create_time); #因?yàn)槭莝erial類型,自增的所以會(huì)自動(dòng)創(chuàng)建一個(gè)序列 postgres=# \d List of relations Schema | Name | Type | Owner --------+----------------+-------------------+---------- public | tbl_log | partitioned table | postgres public | tbl_log_id_seq | sequence | postgres (7 rows)
2、如果沒有創(chuàng)建分區(qū)就直接插入數(shù)據(jù)會(huì)報(bào)錯(cuò)
postgres=# INSERT INTO tbl_log(id, create_time, remark) VALUES (1, '2018-02-01', 'a'); ERROR: no partition of relation "tbl_log" found for row DETAIL: Partition key of the failing row contains (create_time) = (2018-02-01 00:00:00). postgres=#
3、創(chuàng)建分區(qū)
#包括左邊1.1,不包括2.1 CREATE TABLE tbl_log_p201801 PARTITION OF tbl_log FOR VALUES FROM ('2018-01-01') TO ('2018-02-01'); CREATE TABLE tbl_log_p201802 PARTITION OF tbl_log FOR VALUES FROM ('2018-02-01') TO ('2018-03-01'); CREATE TABLE tbl_log_p201803 PARTITION OF tbl_log FOR VALUES FROM ('2018-03-01') TO ('2018-04-01'); CREATE TABLE tbl_log_default PARTITION OF tbl_log DEFAULT; INSERT INTO tbl_log(id, create_time, remark) VALUES (1, '2018-02-01', 'a'); INSERT INTO tbl_log(id, create_time, remark) VALUES (2, '2018-03-01', 'b'); INSERT INTO tbl_log(id, create_time, remark) VALUES (3, '2018-04-01', 'd'); INSERT INTO tbl_log(id, create_time, remark) VALUES (4, '2020-07-01', 'c');
4、查看分區(qū)情況
postgres=# select * from tbl_log; id | create_time | remark ----+---------------------+-------- 1 | 2018-02-01 00:00:00 | a 2 | 2018-03-01 00:00:00 | b 3 | 2018-04-01 00:00:00 | d 4 | 2020-07-01 00:00:00 | c (4 rows) postgres=# select * from tbl_log_p201801; id | create_time | remark ----+-------------+-------- (0 rows) postgres=# select * from tbl_log_p201802; id | create_time | remark ----+---------------------+-------- 1 | 2018-02-01 00:00:00 | a (1 row) postgres=# select * from tbl_log_p201803; id | create_time | remark ----+---------------------+-------- 2 | 2018-03-01 00:00:00 | b (1 row) postgres=# select * from tbl_log_default; id | create_time | remark ----+---------------------+-------- 3 | 2018-04-01 00:00:00 | d 4 | 2020-07-01 00:00:00 | c (2 rows) postgres=#
2、有default 分區(qū),再加分區(qū)
因?yàn)橛衐efault 分區(qū),再加分區(qū),所以會(huì)報(bào)錯(cuò)
postgres=# CREATE TABLE tbl_log_p201804 PARTITION OF tbl_log FOR VALUES FROM ('2018-04-01') TO ('2018-05-01'); ERROR: updated partition constraint for default partition "tbl_log_default" would be violated by some row
解決辦法:
以上添加分區(qū)報(bào)錯(cuò),需要解綁default分區(qū),之后再添加,如下
1、解綁Default分區(qū)
postgres=# ALTER TABLE tbl_log DETACH PARTITION tbl_log_default; ALTER TABLE
2、創(chuàng)建想要的分區(qū)
postgres=# CREATE TABLE tbl_log_p201804 PARTITION OF tbl_log FOR VALUES FROM ('2018-04-01') TO ('2018-05-01'); CREATE TABLE
3、分區(qū)創(chuàng)建成功,分區(qū)創(chuàng)建之后需把DEFAULT分區(qū)連接。
連接DEFAULT分區(qū)報(bào)錯(cuò),如下:
postgres=# ALTER TABLE tbl_log ATTACH PARTITION tbl_log_default DEFAULT; ERROR: partition constraint is violated by some row postgres=# INSERT INTO tbl_log_p201804 SELECT * FROM tbl_log_default; ERROR: new row for relation "tbl_log_p201804" violates partition constraint DETAIL: Failing row contains (4, 2020-07-01 00:00:00, c).
因?yàn)閠bl_log_default分區(qū)內(nèi)有2018-04-01的數(shù)據(jù),把這個(gè)數(shù)據(jù)從tbl_log_default中導(dǎo)出到對應(yīng)的分區(qū),并清理tbl_log_default中的對應(yīng)的數(shù)據(jù)
postgres=# INSERT INTO tbl_log_p201804 SELECT * FROM tbl_log_default where create_time>='2018-04-01' and create_time<'2018-05-01'; INSERT 0 1 postgres=# delete from tbl_log_default where create_time>='2018-04-01' and create_time<'2018-05-01'; DELETE 1
4、再次連接DEFAULT分區(qū)成功
postgres=# ALTER TABLE tbl_log ATTACH PARTITION tbl_log_default DEFAULT; ALTER TABLE
3、沒有default的分區(qū)
創(chuàng)建沒有default的分區(qū),當(dāng)插入的數(shù)據(jù)超過規(guī)劃好的分區(qū)的時(shí)候會(huì)報(bào)錯(cuò)
1、創(chuàng)建1月份分區(qū)
create table tbl_log2 ( id serial, create_time timestamp(0) without time zone, remark char(1) ) PARTITION BY RANGE (create_time); CREATE TABLE tbl_log2_p201801 PARTITION OF tbl_log2 FOR VALUES FROM ('2018-01-01') TO ('2018-02-01');
插入2月的數(shù)據(jù)就會(huì)報(bào)錯(cuò)
postgres=# INSERT INTO tbl_log2(id, create_time, remark) VALUES (1, '2018-01-01', 'a'); INSERT 0 1 postgres=# INSERT INTO tbl_log2(id, create_time, remark) VALUES (1, '2018-02-01', 'a'); ERROR: no partition of relation "tbl_log2" found for row DETAIL: Partition key of the failing row contains (create_time) = (2018-02-01 00:00:00).
4、給分區(qū)表ddl
4.1、在原來沒有主鍵的分區(qū)表加主鍵
結(jié)論:
1、在主表加主鍵,主鍵為僅僅想要的主鍵,會(huì)報(bào)錯(cuò),需要用想要的主鍵+分區(qū)鍵組合為主鍵
2、分區(qū)表可以單獨(dú)添加主鍵
1.1、在主表加主鍵,主鍵為僅僅想要的主鍵,報(bào)錯(cuò)如下 must include all partitioning columns
postgres=# alter table tbl_log add primary key(id); ERROR: unique constraint on partitioned table must include all partitioning columns DETAIL: PRIMARY KEY constraint on table "tbl_log" lacks column "create_time" which is part of the partition key. postgres=# alter table tbl_log add primary key(id)
1.2、在主表添加主鍵需要是想要的主鍵+分區(qū)鍵
postgres=# alter table tbl_log add primary key (id,create_time); ALTER TABLE postgres=# \d tbl_log Partitioned table "public.tbl_log" Column | Type | Collation | Nullable | Default -------------+--------------------------------+-----------+----------+------------------------------------- id | integer | | not null | nextval('tbl_log_id_seq'::regclass) create_time | timestamp(0) without time zone | | not null | remark | character(1) | | | name | character varying(2) | | | Partition key: RANGE (create_time) Indexes: "tbl_log_pkey" PRIMARY KEY, btree (id, create_time) Number of partitions: 5 (Use \d+ to list them.) postgres=# \d tbl_log_p201801 Table "public.tbl_log_p201801" Column | Type | Collation | Nullable | Default -------------+--------------------------------+-----------+----------+------------------------------------- id | integer | | not null | nextval('tbl_log_id_seq'::regclass) create_time | timestamp(0) without time zone | | not null | remark | character(1) | | | name | character varying(2) | | | Partition of: tbl_log FOR VALUES FROM ('2018-01-01 00:00:00') TO ('2018-02-01 00:00:00') Indexes: "tbl_log_p201801_pkey" PRIMARY KEY, btree (id, create_time)
1.3、可以給分區(qū)表單獨(dú)添加主鍵
postgres=# alter table tbl_log_p201801 add primary key (id); ALTER TABLE postgres=# \d tbl_log_p201801 Table "public.tbl_log_p201801" Column | Type | Collation | Nullable | Default -------------+--------------------------------+-----------+----------+------------------------------------- id | integer | | not null | nextval('tbl_log_id_seq'::regclass) create_time | timestamp(0) without time zone | | | remark | character(1) | | | name | character varying(2) | | | Partition of: tbl_log FOR VALUES FROM ('2018-01-01 00:00:00') TO ('2018-02-01 00:00:00') Indexes: "tbl_log_p201801_pkey" PRIMARY KEY, btree (id) postgres=#
4.2、創(chuàng)建分區(qū)表時(shí),就指定主鍵
主鍵不包括分區(qū)鍵,報(bào)錯(cuò)提示must include all partitioning columns
create table tbl_log2 ( id int, create_time timestamp(0) without time zone, remark char(1), primary key (id) ); ERROR: unique constraint on partitioned table must include all partitioning columns DETAIL: PRIMARY KEY constraint on table "tbl_log2" lacks column "create_time" which is part of the partition key.
修改語句,添加分區(qū)鍵也為主鍵,創(chuàng)建成功
create table tbl_log2 ( id int, create_time timestamp(0) without time zone, remark char(1), primary key (id,create_time) ) PARTITION BY RANGE (create_time); CREATE TABLE
4.3、分區(qū)表加字段,修改字段
1、加字段,可以成功添加,在主表加字段,分區(qū)表會(huì)自動(dòng)添加
postgres=# alter table tbl_log add name varchar(2); ALTER TABLE postgres=# \d tbl_log; Partitioned table "public.tbl_log" Column | Type | Collation | Nullable | Default -------------+--------------------------------+-----------+----------+------------------------------------- id | integer | | not null | nextval('tbl_log_id_seq'::regclass) create_time | timestamp(0) without time zone | | | remark | character(1) | | | name | character varying(2) | | | Partition key: RANGE (create_time) Number of partitions: 5 (Use \d+ to list them.) postgres=# \d tbl_log_p201801; Table "public.tbl_log_p201801" Column | Type | Collation | Nullable | Default -------------+--------------------------------+-----------+----------+------------------------------------- id | integer | | not null | nextval('tbl_log_id_seq'::regclass) create_time | timestamp(0) without time zone | | | remark | character(1) | | | name | character varying(2) | | | Partition of: tbl_log FOR VALUES FROM ('2018-01-01 00:00:00') TO ('2018-02-01 00:00:00')
2、直接在分區(qū)表加字段會(huì)報(bào)錯(cuò)
postgres=# alter table tbl_log_p201801 add name2 varchar(2); ERROR: cannot add column to a partition
3、修改字段
postgres=# alter table tbl_log alter column remark type varchar(10); ALTER TABLE postgres=# \d tbl_log; Partitioned table "public.tbl_log" Column | Type | Collation | Nullable | Default -------------+--------------------------------+-----------+----------+------------------------------------- id | integer | | not null | nextval('tbl_log_id_seq'::regclass) create_time | timestamp(0) without time zone | | not null | remark | character varying(10) | | | name | character varying(2) | | | Partition key: RANGE (create_time) Indexes: "tbl_log_pkey" PRIMARY KEY, btree (id, create_time) Number of partitions: 5 (Use \d+ to list them.) postgres=# \d tbl_log_p201801 Table "public.tbl_log_p201801" Column | Type | Collation | Nullable | Default -------------+--------------------------------+-----------+----------+------------------------------------- id | integer | | not null | nextval('tbl_log_id_seq'::regclass) create_time | timestamp(0) without time zone | | not null | remark | character varying(10) | | | name | character varying(2) | | | Partition of: tbl_log FOR VALUES FROM ('2018-01-01 00:00:00') TO ('2018-02-01 00:00:00') Indexes: "tbl_log_p201801_pkey" PRIMARY KEY, btree (id, create_time) postgres=#
總結(jié)
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