postgresql 9.6 分区表测试方案与记录
postgresql 9 分区表测试
一、 pg 9 准备分区表测试环境
在测试环境创建好 pg 9 测试环境，连接到pg 9 实例上：
/usr/local/pgsql101/bin/psql -h 127.0.0.1 -p 5432 -U postgres -d postgres
-- 创建测试库
\l
CREATE DATABASE pg_9_db;
\l
\c pg_9_db
一、 pg 9 创建新分区表
1. 定义父表
CREATE TABLE pg_9_tab( id serial,uid int4,username varchar,create_time bigint);
CREATE INDEX idx_pg_9_tab_ctime ON pg_9_tab USING btree (create_time);
2. 定义子表： 用 inherits 创建分区表
3. 定义子表约束 ：约束数据对应分区的规则
-- 按照时间戳分区，对应分区表与时间戳
2019-09-15 00:00:00 1568476800
2019-10-01 00:00:00 1569859200
2019-11-01 00:00:00 1572537600
2019-12-01 00:00:00 1575129600
2019-12-15 00:00:00 1576339200
2020-01-01 00:00:00 1577808000
2020-02-01 00:00:00 1580486400
上面第2步和第3步，两步合并在一起，创建分区表
CREATE TABLE pg_9_tab_p_hisotry(CHECK ( create_time < 1569859200 ) ) INHERITS(pg_9_tab);
CREATE TABLE pg_9_tab_p_201910(CHECK ( create_time >= 1569859200 and create_time < 1572537600 ) ) INHERITS(pg_9_tab);
CREATE TABLE pg_9_tab_p_201911(CHECK ( create_time >= 1572537600 and create_time < 1575129600 ) ) INHERITS(pg_9_tab);
CREATE TABLE pg_9_tab_p_201912(CHECK ( create_time >= 1575129600 and create_time < 1577808000 ) ) INHERITS(pg_9_tab);
4. 创建子表索引 ：子表不会继承父表的索引
CREATE INDEX idx_pg_9_tab_p_hisotry_ctime ON pg_9_tab_p_hisotry USING btree (create_time);
CREATE INDEX idx_pg_9_tab_p_201910_ctime ON pg_9_tab_p_201910 USING btree (create_time);
CREATE INDEX idx_pg_9_tab_p_201911_ctime ON pg_9_tab_p_201911 USING btree (create_time);
CREATE INDEX idx_pg_9_tab_p_201912_ctime ON pg_9_tab_p_201912 USING btree (create_time);
5. 创建分区插入、修改、删除函数和触发器
-- 创建分表insert的路由函数
CREATE OR REPLACE FUNCTION pg_9_tab_insert_trigger()
RETURNS trigger
LANGUAGE plpgsql
AS $function$
BEGIN
IF ( NEW.create_time < 1569859200 ) THEN
INSERT INTO pg_9_tab_p_hisotry VALUES (NEW.*);
ELSIF ( NEW.create_time >= 1569859200 and NEW.create_time < 1572537600 ) THEN
INSERT INTO pg_9_tab_p_201910 VALUES (NEW.*);
ELSIF ( NEW.create_time >= 1572537600 and NEW.create_time < 1575129600 ) THEN
INSERT INTO pg_9_tab_p_201911 VALUES (NEW.*);
ELSIF ( NEW.create_time >= 1575129600 and NEW.create_time < 1577808000 ) THEN
INSERT INTO pg_9_tab_p_201912 VALUES (NEW.*);
ELSE
RAISE EXCEPTION 'create_time out of range. Fix the pg_9_tab_insert_trigger() function!';
END IF;
RETURN NULL;
END;
$function$;
函数中的 new.* 是指要插入的数据航，在父表上定义插入触发器：
CREATE TRIGGER insert_pg_9_tab_trigger BEFORE INSERT ON pg_9_tab FOR EACH ROW
EXECUTE PROCEDURE pg_9_tab_insert_trigger();
6. 启用分区查询参数：设置 constraint_exclusion 参数
show constraint_exclusion;
SET constraint_exclusion = off; ##所有表都不通过约束优化查询
SET constraint_exclusion = on; ##所有表都通过约束优化查询
SET constraint_exclusion = partition; ##之对继承表和UNION ALL 子查询通过检索约束来优化查询
-- 执行计划查看父表还是子表
EXPLAIN ANALYZE SELECT * from pg_9_tab WHERE create_time > 1575129600 AND create_time < 1576339200;
EXPLAIN ANALYZE SELECT * from pg_9_tab_p_201910 WHERE create_time > 1575129600 AND create_time < 1576339200;
二、 pg 9 插入数据与数据分部确认
-- 插入数据
INSERT INTO pg_9_tab(uid,username,create_time)
SELECT round(1000*random()),chr(int4(random()*26)+65),generate_series( 1568476800, 1576339200, 360);
INSERT INTO pg_9_tab(uid,username,create_time) SELECT 346,'F',1292083200;
-- 查看表
SELECT count(*) FROM pg_9_tab;
SELECT count(*) FROM ONLY pg_9_tab;
\d+ pg_9_tab*
SELECT * FROM pg_9_tab LIMIT 2;
SELECT * FROM pg_9_tab_p_201911 LIMIT 2;
三、 pg 9 分区表添加新分区
-- 添加分区
1. 创建分区表
CREATE TABLE pg_9_tab_p_202001(LIKE pg_9_tab INCLUDING ALL );
2. 添加约束
ALTER TABLE pg_9_tab_p_202001 ADD CONSTRAINT pg_9_tab_create_time_check
CHECK (create_time >= 1577808000 and create_time < 1580486400);
3. 刷新触发器
CREATE OR REPLACE FUNCTION pg_9_tab_insert_trigger()
RETURNS trigger
LANGUAGE plpgsql
AS $function$
BEGIN
IF ( NEW.create_time < 1569859200 ) THEN
INSERT INTO pg_9_tab_p_hisotry VALUES (NEW.*);
ELSIF ( NEW.create_time >= 1569859200 and NEW.create_time < 1572537600 ) THEN
INSERT INTO pg_9_tab_p_201910 VALUES (NEW.*);
ELSIF ( NEW.create_time >= 1572537600 and NEW.create_time < 1575129600 ) THEN
INSERT INTO pg_9_tab_p_201911 VALUES (NEW.*);
ELSIF ( NEW.create_time >= 1575129600 and NEW.create_time < 1577808000 ) THEN
INSERT INTO pg_9_tab_p_201912 VALUES (NEW.*);
ELSIF ( NEW.create_time >= 1577808000 and NEW.create_time < 1580486400 ) THEN
INSERT INTO pg_9_tab_p_202001 VALUES (NEW.*);
ELSE
RAISE EXCEPTION 'create_time out of range. Fix the pg_9_tab_insert_trigger() function!';
END IF;
RETURN NULL;
END;
$function$;
4. 将新分区继承到父表
ALTER TABLE pg_9_tab_p_202001 INHERIT pg_9_tab;
四、 pg 9 分区表删除分区
-- 删除分区
DROP TABLE pg_9_tab_p_hisotry;
ALTER TABLE pg_9_tab_p_hisotry NO INHERIT pg_9_tab;
ALTER TABLE pg_9_tab_p_hisotry DETACH PARTITION pg_9_tab;
-- 分区查询
\d pg_9_tab
五、 pg 9 实际测试结果
上面步骤，实际测试结果为：
postgresql 9 分区表实际测试过程-- 时间戳对应转换：pg_9_db=# select extract(epoch from to_timestamp('2019-09-15 00:00:00','yyyy-MM-DD hh34:mi:ss')); date_part ------------ 1568476800(1 row)pg_9_db=# select extract(epoch from to_timestamp('2019-10-01 00:00:00','yyyy-MM-DD hh34:mi:ss')); date_part ------------ 1569859200(1 row)pg_9_db=# select extract(epoch from to_timestamp('2019-11-01 00:00:00','yyyy-MM-DD hh34:mi:ss')); date_part ------------ 1572537600(1 row)pg_9_db=# select extract(epoch from to_timestamp('2019-12-01 00:00:00','yyyy-MM-DD hh34:mi:ss')); date_part ------------ 1575129600(1 row)pg_9_db=# select extract(epoch from to_timestamp('2019-12-15 00:00:00','yyyy-MM-DD hh34:mi:ss')); date_part ------------ 1576339200(1 row)pg_9_db=# select extract(epoch from to_timestamp('2020-01-01 00:00:00','yyyy-MM-DD hh34:mi:ss')); date_part ------------ 1577808000(1 row)pg_9_db=# select extract(epoch from to_timestamp('2020-02-01 00:00:00','yyyy-MM-DD hh34:mi:ss')); date_part ------------ 1580486400(1 row)-- 准备测试环境postgres=# CREATE DATABASE pg_9_db;CREATE DATABASEpostgres=# postgres=# \l List of databases Name | Owner | Encoding | Collate | Ctype | Access privileges -------------+----------+----------+------------+------------+----------------------- dba_test_db | postgres | UTF8 | en_US.utf8 | en_US.utf8 | pg_9_db | postgres | UTF8 | en_US.utf8 | en_US.utf8 | postgres | postgres | UTF8 | en_US.utf8 | en_US.utf8 | template0 | postgres | UTF8 | en_US.utf8 | en_US.utf8 | =c/postgres + | | | | | postgres=CTc/postgres template1 | postgres | UTF8 | en_US.utf8 | en_US.utf8 | =c/postgres + | | | | | postgres=CTc/postgres(5 rows)postgres=# \c pg_9_dbYou are now connected to database "pg_9_db" as user "postgres".pg_9_db=# pg_9_db=# \dtDid not find any relations.pg_9_db=# pg_9_db=# -- 创建分区表pg_9_db=# CREATE TABLE pg_9_tab(pg_9_db(# id serial,pg_9_db(# uid int4,pg_9_db(# username varchar,pg_9_db(# create_time bigintpg_9_db(# );CREATE TABLEpg_9_db=# pg_9_db=# CREATE INDEX idx_pg_9_tab_ctime ON pg_9_tab USING btree (create_time);CREATE INDEXpg_9_db=# pg_9_db=# \d+ pg_9_tab Table "public.pg_9_tab" Column | Type | Collation | Nullable | Default | Storage | Stats target | Description -------------+-------------------+-----------+----------+--------------------------------------+----------+--------------+------------- id | integer | | not null | nextval('pg_9_tab_id_seq'::regclass) | plain | | uid | integer | | | | plain | | username | character varying | | | | extended | | create_time | bigint | | | | plain | | Indexes: "idx_pg_9_tab_ctime" btree (create_time)pg_9_db=# pg_9_db=# CREATE TABLE pg_9_tab_p_hisotry(CHECK ( create_time < 1569859200 ) ) INHERITS(pg_9_tab);CREATE TABLEpg_9_db=# CREATE TABLE pg_9_tab_p_201910(CHECK ( create_time >= 1569859200 and create_time < 1572537600 ) ) INHERITS(pg_9_tab);CREATE TABLEpg_9_db=# CREATE TABLE pg_9_tab_p_201911(CHECK ( create_time >= 1572537600 and create_time < 1575129600 ) ) INHERITS(pg_9_tab);CREATE TABLEpg_9_db=# CREATE TABLE pg_9_tab_p_201912(CHECK ( create_time >= 1575129600 and create_time < 1577808000 ) ) INHERITS(pg_9_tab);CREATE TABLEpg_9_db=# pg_9_db=# \d+ pg_9_tab_p_hisotry Table "public.pg_9_tab_p_hisotry" Column | Type | Collation | Nullable | Default | Storage | Stats target | Description -------------+-------------------+-----------+----------+--------------------------------------+----------+--------------+------------- id | integer | | not null | nextval('pg_9_tab_id_seq'::regclass) | plain | | uid | integer | | | | plain | | username | character varying | | | | extended | | create_time | bigint | | | | plain | | Check constraints: "pg_9_tab_p_hisotry_create_time_check" CHECK (create_time < 1569859200)Inherits: pg_9_tabpg_9_db=# pg_9_db=# CREATE INDEX idx_pg_9_tab_p_hisotry_ctime ON pg_9_tab_p_hisotry USING btree (create_time);CREATE INDEXpg_9_db=# CREATE INDEX idx_pg_9_tab_p_201910_ctime ON pg_9_tab_p_201910 USING btree (create_time);CREATE INDEXpg_9_db=# CREATE INDEX idx_pg_9_tab_p_201911_ctime ON pg_9_tab_p_201911 USING btree (create_time);CREATE INDEXpg_9_db=# CREATE INDEX idx_pg_9_tab_p_201912_ctime ON pg_9_tab_p_201912 USING btree (create_time);CREATE INDEXpg_9_db=# pg_9_db=# \d+ pg_9_tab_p_hisotry Table "public.pg_9_tab_p_hisotry" Column | Type | Collation | Nullable | Default | Storage | Stats target | Description -------------+-------------------+-----------+----------+--------------------------------------+----------+--------------+------------- id | integer | | not null | nextval('pg_9_tab_id_seq'::regclass) | plain | | uid | integer | | | | plain | | username | character varying | | | | extended | | create_time | bigint | | | | plain | | Indexes: "idx_pg_9_tab_p_hisotry_ctime" btree (create_time)Check constraints: "pg_9_tab_p_hisotry_create_time_check" CHECK (create_time < 1569859200)Inherits: pg_9_tabpg_9_db=# pg_9_db=# pg_9_db=# pg_9_db=# CREATE OR REPLACE FUNCTION pg_9_tab_insert_trigger()pg_9_db-# RETURNS triggerpg_9_db-# LANGUAGE plpgsqlpg_9_db-# AS $function$pg_9_db$# BEGINpg_9_db$# IF ( NEW.create_time < 1569859200 ) THENpg_9_db$# INSERT INTO pg_9_tab_p_hisotry VALUES (NEW.*);pg_9_db$# ELSIF ( NEW.create_time >= 1569859200 and NEW.create_time < 1572537600 ) THENpg_9_db$# INSERT INTO pg_9_tab_p_201910 VALUES (NEW.*);pg_9_db$# ELSIF ( NEW.create_time >= 1572537600 and NEW.create_time < 1575129600 ) THENpg_9_db$# INSERT INTO pg_9_tab_p_201911 VALUES (NEW.*);pg_9_db$# ELSIF ( NEW.create_time >= 1575129600 and NEW.create_time < 1577808000 ) THENpg_9_db$# INSERT INTO pg_9_tab_p_201912 VALUES (NEW.*);pg_9_db$# ELSEpg_9_db$# RAISE EXCEPTION 'create_time out of range. Fix the pg_9_tab_insert_trigger() function!';pg_9_db$# END IF;pg_9_db$# RETURN NULL;pg_9_db$# END;pg_9_db$# $function$;CREATE FUNCTIONpg_9_db=# pg_9_db=# -- 测试数据插入与分布情况pg_9_db=# pg_9_db=# select count(*) from pg_9_tab; count ------- 0(1 row)pg_9_db=# pg_9_db=# select count(*) from ONLY pg_9_tab; count ------- 0(1 row)pg_9_db=# INSERT INTO pg_9_tab(uid,username,create_time) pg_9_db-# SELECT round(1000*random()),chr(int4(random()*26)+65),generate_series( 1568476800, 1576339200, 360);INSERT 0 0pg_9_db=# pg_9_db=# select count(*) from pg_9_tab; count ------- 21841(1 row)pg_9_db=# select count(*) from ONLY pg_9_tab; count ------- 0(1 row)pg_9_db=# pg_9_db=# select * from pg_9_tab limit 2; id | uid | username | create_time --------+-----+----------+------------- 131227 | 638 | Y | 1568476800 131228 | 523 | E | 1568477160(2 rows)pg_9_db=# pg_9_db=# select * from pg_9_tab_p_201912 limit 2; id | uid | username | create_time --------+-----+----------+------------- 149707 | 892 | [ | 1575129600 149708 | 28 | V | 1575129960(2 rows)pg_9_db=# pg_9_db=# \dt+ pg_9_tab* List of relations Schema | Name | Type | Owner | Size | Description --------+--------------------+-------+----------+------------+------------- public | pg_9_tab | table | postgres | 8192 bytes | public | pg_9_tab_p_201910 | table | postgres | 416 kB | public | pg_9_tab_p_201911 | table | postgres | 400 kB | public | pg_9_tab_p_201912 | table | postgres | 208 kB | public | pg_9_tab_p_hisotry | table | postgres | 232 kB | (5 rows)-- 执行计划与参数pg_9_db=# show constraint_exclusion; constraint_exclusion ---------------------- partition(1 row)pg_9_db=# pg_9_db=# EXPLAIN ANALYZE SELECT * from pg_9_tab WHERE create_time > 1575129600 AND create_time < 1576339200; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------- Append (cost=0.00..72.41 rows=3362 width=18) (actual time=0.017..1.424 rows=3359 loops=1) -> Seq Scan on pg_9_tab (cost=0.00..0.00 rows=1 width=48) (actual time=0.006..0.006 rows=0 loops=1) Filter: ((create_time > 1575129600) AND (create_time < 1576339200)) -> Seq Scan on pg_9_tab_p_201912 (cost=0.00..72.41 rows=3361 width=18) (actual time=0.010..1.007 rows=3359 loops=1) Filter: ((create_time > 1575129600) AND (create_time < 1576339200)) Rows Removed by Filter: 2 Planning time: 0.982 ms Execution time: 1.720 ms(8 rows)pg_9_db=# pg_9_db=# EXPLAIN ANALYZE SELECT * from pg_9_tab_p_201910 WHERE create_time > 1575129600 AND create_time < 1576339200; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------ Index Scan using idx_pg_9_tab_p_201910_ctime on pg_9_tab_p_201910 (cost=0.28..8.30 rows=1 width=18) (actual time=0.039..0.039 rows=0 loops=1) Index Cond: ((create_time > 1575129600) AND (create_time < 1576339200)) Planning time: 0.271 ms Execution time: 0.066 ms(4 rows)pg_9_db=# pg_9_db=# SET constraint_exclusion = off;SETpg_9_db=# pg_9_db=# show constraint_exclusion; constraint_exclusion ---------------------- off(1 row)pg_9_db=# EXPLAIN ANALYZE SELECT * from pg_9_tab WHERE create_time > 1575129600 AND create_time < 1576339200; QUERY PLAN -------------------------------------------------------------------------------------------------------------------------------------------------------- Append (cost=0.00..97.32 rows=3365 width=18) (actual time=0.066..1.446 rows=3359 loops=1) -> Seq Scan on pg_9_tab (cost=0.00..0.00 rows=1 width=48) (actual time=0.005..0.005 rows=0 loops=1) Filter: ((create_time > 1575129600) AND (create_time < 1576339200)) -> Index Scan using idx_pg_9_tab_p_hisotry_ctime on pg_9_tab_p_hisotry (cost=0.28..8.30 rows=1 width=18) (actual time=0.016..0.016 rows=0 loops=1) Index Cond: ((create_time > 1575129600) AND (create_time < 1576339200)) -> Index Scan using idx_pg_9_tab_p_201910_ctime on pg_9_tab_p_201910 (cost=0.28..8.30 rows=1 width=18) (actual time=0.020..0.020 rows=0 loops=1) Index Cond: ((create_time > 1575129600) AND (create_time < 1576339200)) -> Index Scan using idx_pg_9_tab_p_201911_ctime on pg_9_tab_p_201911 (cost=0.28..8.30 rows=1 width=18) (actual time=0.014..0.014 rows=0 loops=1) Index Cond: ((create_time > 1575129600) AND (create_time < 1576339200)) -> Seq Scan on pg_9_tab_p_201912 (cost=0.00..72.41 rows=3361 width=18) (actual time=0.010..0.981 rows=3359 loops=1) Filter: ((create_time > 1575129600) AND (create_time < 1576339200)) Rows Removed by Filter: 2 Planning time: 0.811 ms Execution time: 1.796 ms(14 rows)pg_9_db=# pg_9_db=# EXPLAIN ANALYZE SELECT * from pg_9_tab_p_201910 WHERE create_time > 1575129600 AND create_time < 1576339200; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------ Index Scan using idx_pg_9_tab_p_201910_ctime on pg_9_tab_p_201910 (cost=0.28..8.30 rows=1 width=18) (actual time=0.008..0.008 rows=0 loops=1) Index Cond: ((create_time > 1575129600) AND (create_time < 1576339200)) Planning time: 0.147 ms Execution time: 0.031 ms(4 rows)pg_9_db=# pg_9_db=# SET constraint_exclusion = on;SETpg_9_db=# pg_9_db=# show constraint_exclusion; constraint_exclusion ---------------------- on(1 row)pg_9_db=# EXPLAIN ANALYZE SELECT * from pg_9_tab WHERE create_time > 1575129600 AND create_time < 1576339200; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------- Append (cost=0.00..72.41 rows=3362 width=18) (actual time=0.029..1.401 rows=3359 loops=1) -> Seq Scan on pg_9_tab (cost=0.00..0.00 rows=1 width=48) (actual time=0.012..0.012 rows=0 loops=1) Filter: ((create_time > 1575129600) AND (create_time < 1576339200)) -> Seq Scan on pg_9_tab_p_201912 (cost=0.00..72.41 rows=3361 width=18) (actual time=0.016..0.982 rows=3359 loops=1) Filter: ((create_time > 1575129600) AND (create_time < 1576339200)) Rows Removed by Filter: 2 Planning time: 0.402 ms Execution time: 1.782 ms(8 rows)pg_9_db=# EXPLAIN ANALYZE SELECT * from pg_9_tab_p_201910 WHERE create_time > 1575129600 AND create_time < 1576339200; QUERY PLAN ------------------------------------------------------------------------------------- Result (cost=0.00..0.00 rows=0 width=48) (actual time=0.001..0.001 rows=0 loops=1) One-Time Filter: false Planning time: 0.122 ms Execution time: 0.016 ms(4 rows)pg_9_db=# -- 添加新分区pg_9_db-# pg_9_db-# \d+ pg_9_tab Table "public.pg_9_tab" Column | Type | Collation | Nullable | Default | Storage | Stats target | Description -------------+-------------------+-----------+----------+--------------------------------------+----------+--------------+------------- id | integer | | not null | nextval('pg_9_tab_id_seq'::regclass) | plain | | uid | integer | | | | plain | | username | character varying | | | | extended | | create_time | bigint | | | | plain | | Indexes: "idx_pg_9_tab_ctime" btree (create_time)Triggers: insert_pg_9_tab_trigger BEFORE INSERT ON pg_9_tab FOR EACH ROW EXECUTE PROCEDURE pg_9_tab_insert_trigger()Child tables: pg_9_tab_p_201910, pg_9_tab_p_201911, pg_9_tab_p_201912, pg_9_tab_p_hisotrypg_9_db-# pg_9_db-# pg_9_db-# CREATE TABLE pg_9_tab_p_202001(LIKE pg_9_tab INCLUDING ALL );ERROR: syntax error at or near "、"LINE 1: 、 ^pg_9_db=# pg_9_db=# CREATE TABLE pg_9_tab_p_202001(LIKE pg_9_tab INCLUDING ALL );CREATE TABLEpg_9_db=# pg_9_db=# ALTER TABLE pg_9_tab_p_202001 ADD CONSTRAINT pg_9_tab_create_time_checkpg_9_db-# CHECK (create_time >= 1577808000 and create_time < 1580486400);ALTER TABLEpg_9_db=# pg_9_db=# CREATE OR REPLACE FUNCTION pg_9_tab_insert_trigger()pg_9_db-# RETURNS triggerpg_9_db-# LANGUAGE plpgsqlpg_9_db-# AS $function$pg_9_db$# BEGINpg_9_db$# IF ( NEW.create_time < 1569859200 ) THENpg_9_db$# INSERT INTO pg_9_tab_p_hisotry VALUES (NEW.*);pg_9_db$# ELSIF ( NEW.create_time >= 1569859200 and NEW.create_time < 1572537600 ) THENpg_9_db$# INSERT INTO pg_9_tab_p_201910 VALUES (NEW.*);pg_9_db$# ELSIF ( NEW.create_time >= 1572537600 and NEW.create_time < 1575129600 ) THENpg_9_db$# INSERT INTO pg_9_tab_p_201911 VALUES (NEW.*);pg_9_db$# ELSIF ( NEW.create_time >= 1575129600 and NEW.create_time < 1577808000 ) THENpg_9_db$# INSERT INTO pg_9_tab_p_201912 VALUES (NEW.*);pg_9_db$# ELSIF ( NEW.create_time >= 1577808000 and NEW.create_time < 1580486400 ) THENpg_9_db$# INSERT INTO pg_9_tab_p_202001 VALUES (NEW.*);pg_9_db$# ELSEpg_9_db$# RAISE EXCEPTION 'create_time out of range. Fix the pg_9_tab_insert_trigger() function!';pg_9_db$# END IF;pg_9_db$# RETURN NULL;pg_9_db$# END;pg_9_db$# $function$;CREATE FUNCTIONpg_9_db=# pg_9_db=# ALTER TABLE pg_9_tab_p_202001 INHERIT pg_9_tab;ALTER TABLEpg_9_db=# pg_9_db=# \d+ pg_9_tab Table "public.pg_9_tab" Column | Type | Collation | Nullable | Default | Storage | Stats target | Description -------------+-------------------+-----------+----------+--------------------------------------+----------+--------------+------------- id | integer | | not null | nextval('pg_9_tab_id_seq'::regclass) | plain | | uid | integer | | | | plain | | username | character varying | | | | extended | | create_time | bigint | | | | plain | | Indexes: "idx_pg_9_tab_ctime" btree (create_time)Triggers: insert_pg_9_tab_trigger BEFORE INSERT ON pg_9_tab FOR EACH ROW EXECUTE PROCEDURE pg_9_tab_insert_trigger()Child tables: pg_9_tab_p_201910, pg_9_tab_p_201911, pg_9_tab_p_201912, pg_9_tab_p_202001, pg_9_tab_p_hisotrypg_9_db=# -- 删除分区pg_9_db=# \d+ pg_9_tab Table "public.pg_9_tab" Column | Type | Collation | Nullable | Default | Storage | Stats target | Description -------------+-------------------+-----------+----------+--------------------------------------+----------+--------------+------------- id | integer | | not null | nextval('pg_9_tab_id_seq'::regclass) | plain | | uid | integer | | | | plain | | username | character varying | | | | extended | | create_time | bigint | | | | plain | | Indexes: "idx_pg_9_tab_ctime" btree (create_time)Triggers: insert_pg_9_tab_trigger BEFORE INSERT ON pg_9_tab FOR EACH ROW EXECUTE PROCEDURE pg_9_tab_insert_trigger()Child tables: pg_9_tab_p_201910, pg_9_tab_p_201911, pg_9_tab_p_201912, pg_9_tab_p_202001, pg_9_tab_p_hisotrypg_9_db=# pg_9_db=# ALTER TABLE pg_9_tab_p_hisotry NO INHERIT pg_9_tab;ALTER TABLEpg_9_db=# pg_9_db=# \d+ pg_9_tab Table "public.pg_9_tab" Column | Type | Collation | Nullable | Default | Storage | Stats target | Description -------------+-------------------+-----------+----------+--------------------------------------+----------+--------------+------------- id | integer | | not null | nextval('pg_9_tab_id_seq'::regclass) | plain | | uid | integer | | | | plain | | username | character varying | | | | extended | | create_time | bigint | | | | plain | | Indexes: "idx_pg_9_tab_ctime" btree (create_time)Triggers: insert_pg_9_tab_trigger BEFORE INSERT ON pg_9_tab FOR EACH ROW EXECUTE PROCEDURE pg_9_tab_insert_trigger()Child tables: pg_9_tab_p_201910, pg_9_tab_p_201911, pg_9_tab_p_201912, pg_9_tab_p_202001pg_9_db=# DROP TABLE pg_9_tab_p_hisotry;DROP TABLEpg_9_db=#
