本页为您介绍如何禁用或启用定时任务。 broken(jobno bigint,broken bool)：第一个参数是定时任务的jodid；第二个参数是启用、禁用定时任务，true表示启用，false表示禁用。具体表现在job表的active字段。active为false表示禁用。 plaintext select dbmsjob.broken(20002,false); 禁用jobid为20002的定时任务 select dbmsjob.broken(20002, true); 启用jobid为20002的定时任务 期望结果，查询dbmsjob.job表中的jobid为20002的定时任务的active字段为falsetrue 启用定时任务 run(jobno bigint)：第一个参数是定时任务的jodid；具体表现在job表的active字段。 plaintext select dbmsjob.run(25002); 启用jobid为25002的定时任务。

本页为您介绍如何删除定时任务。 unschedule(jobno bigint)：第一个参数是定时任务的jodid。 plaintext select dbmsjob.unschedule(20002); 删除jobid为20002的定时任务 期望结果，查询dbmsjob.job表发现jobid为20002的定时任务不存在

本页为您介绍如何查询定时任务以及执行记录。 plaintext select from dbmsjob.job; 查询定时任务 select from dbmsjob.joblog; 查询定时任务的执行记录

本页为您介绍初始化实例的操作步骤。 1. 通过pgxcctl新建一个双CN、双DN的实例，并开启服务。 2. 通过telesql连接到CN节点。 3. 执行sql “create default node group defaultgroup with(dn01, dn02); create sharding group to group defaultgroup;”。

本页为您介绍创建插件的操作步骤。 1. 通过telesql连接到CN节点。 2. 执行sql “create extension pgtrashcan;” 3. 执行telesql命令dx，查看插件pgtrashcan是否存在。

本页为您介绍创建表并插入数据的方法。 plaintext teledb CREATE TABLE foo (bar bigint, baz text); CREATE TABLE teledb ALTER TABLE foo SET (autovacuumenabled false, toast.autovacuumenabled false); ALTER TABLE teledb INSERT INTO foo VALUES (1, 'aaa'), (2, 'bbb'),(3,'ccc'); INSERT 0 3

本页为您介绍初始化实例的操作步骤。 1. 通过pgxcctl新建一个双CN、双DN的实例，并开启服务。 2. 通过telesql连接到CN节点。 3. 执行sql “create default node group defaultgroup with(dn01, dn02); create sharding group to group defaultgroup;”。

本文为您介绍如何使用gin索引。 pgtrgm索引 注意 此功能需加载插件 pgtrgm。 teledb drop index ttrgmtrgmidx; DROP INDEX teledb create index ttrgmtrgmidx on ttrgm using gin(trgm gintrgmops); CREATE INDEX jsonb索引 teledb create table tjsonb(id int,fjsonb jsonb); CREATE TABLE teledb create index tjsonbfjsonbidx on tjsonb using gin(fjsonb); CREATE INDEX 数组索引 teledb create table tarray(id int, mc text[]); CREATE TABLE teledb insert into tarray select t,('{'md5(t::text)'}')::text[] from generateseries(1,1000000) as t; INSERT 0 1000000 teledb analyze; ANALYZE teledb timing Timing is on. teledb explain select from tarray where mc @> ('{'md5('1')'}')::text[]; QUERY PLAN Remote Fast Query Execution (cost0.00..0.00 rows0 width0) Node/s: dn01, dn02 > Gather (cost1000.00..13094.09 rows2503 width61) Workers Planned: 2 > Parallel Seq Scan on tarray (cost0.00..11843.79 rows1043 width61) Filter: (mc @> ((('{'::text 'c4ca4238a0b923820dcc509a6f75849b'::text) '}'::text))::text[]) (6 rows) Time: 21.368 ms teledb select from tarray where mc @> ('{'md5('1')'}')::text[]; id mc + 1 {c4ca4238a0b923820dcc509a6f75849b} (1 row) Time: 431.788 ms teledb

本文为您介绍SELECT语法的特殊应用场景，例如多行变成单行和一列变成多行。 多行变成单行 teledb select arraytostring(array(select nickname from teledbpg1),','); arraytostring test,pg (1 row) 一列变成多行 teledb insert into teledbpg1 values(6, 'teledb, teledb1'); INSERT 0 1 teledb select regexpsplittotable((select nickname from teledbpg1 where id6 limit 1), ','); regexpsplittotable teledb teledb1 (2 rows)

本页为您介绍如何查询元数据表。 1. 通过telesql连接到CN节点。 2. 执行psql命令 “dn”，查看schema trash是否存在。 3. 执行psql命令 “dt trash.”，查看元数据表trashtable是否存在 4. 执行sql “select from trash.trashtable;”。

本页为您介绍查询所有历史数据的方法。 plaintext teledb SELECT pgxactcommittimestamp(xmin) as xmintime, pgxactcommittimestamp(case xmax when 0 then null else xmax end) as xmaxtime, FROM pgdirtyread('foo') AS t(tableoid oid, ctid tid, xmin xid, xmax xid, cmin cid, cmax cid, dead boolean,bar bigint, baz text); xmintime xmaxtime tableoid ctid xmin xmax cmin cmax dead bar baz ++++++++++ 20231102 16:42:15.694944+08 20231102 16:42:22.213469+08 16432 (0,1) 677 678 0 0 t 1 aaa 20231102 16:42:15.694944+08 20231102 16:42:28.684133+08 16432 (0,2) 677 679 0 0 t 2 bbb 20231102 16:42:47.230036+08 16432 (0,3) 680 0 0 0 f 5 eee 20231102 16:42:54.18001+08 20231102 16:43:00.369209+08 16432 (0,4) 681 682 0 0 f 6 fff 20231102 16:42:15.694944+08 20231102 16:42:34.764626+08 16432 (0,1) 657 658 0 0 t 3 ccc 20231102 16:42:34.764626+08 20231102 16:42:41.46109+08 16432 (0,2) 658 659 0 0 f 3 cccnew 20231102 16:42:41.46109+08 16432 (0,3) 659 0 0 0 f 3 cccnew2 (7 rows)

本页为您介绍创建插件的操作步骤。 1. 通过telesql连接到CN节点。 2. 执行sql “create extension pgdirtyread;” 3. 执行telesql命令dx，查看插件pgdirtyread是否存在。

本文为你介绍合并多个查询结果的方法。 不过滤重复的记录。 teledb create table teledbpg1(id int, nickname varchar); CREATE TABLE teledb insert into teledbpg1 values(3, 'pg'),(5,'test'); COPY 2 teledb select from teledbpg union all select from teledbpg1; id nickname + 1 teledb 1 hello,pgxc 2 TELEDB 3 pg 4 5 test 3 pg (7 rows) 过滤重复的记录。 teledb select from teledbpg union select from teledbpg1; id nickname + 1 teledb 1 hello,pgxc 4 5 test 2 TELEDB 3 pg (6 rows) 每个子查询分布在合并结果中的使用。 teledb select from (select from teledbpg limit 2) as t union all select from (select from teledbpg1 limit 2) teledb ; id nickname + 1 teledb 1 hello,pgxc 5 test 3 pg (4 rows)

本文为您介绍如何管理表达式索引。 teledb create table tupper(id int,mc text); CREATE TABLE teledb create index tuppermc on tupper(mc); CREATE INDEX teledb insert into tupper select t,md5(t::text) from generateseries(1,10000) as t; INSERT 0 10000 teledb analyze tupper; ANALYZE teledb explain select from tupper where upper(mc)md5('1'); QUERY PLAN Remote Fast Query Execution (cost0.00..0.00 rows0 width0) Node/s: dn01, dn02 > Seq Scan on tupper (cost0.00..133.58 rows25 width37) Filter: (upper(mc) 'c4ca4238a0b923820dcc509a6f75849b'::text) (4 rows) teledb create index tuppermc on tupper(upper(mc)); ERROR: relation "tuppermc" already exists teledb create index tuppermc1 on tupper(upper(mc)); CREATE INDEX teledb explain select from tupper where upper(mc)md5('1'); QUERY PLAN Remote Fast Query Execution (cost0.00..0.00 rows0 width0) Node/s: dn01, dn02 > Bitmap Heap Scan on tupper (cost4.48..50.94 rows25 width37) Recheck Cond: (upper(mc) 'c4ca4238a0b923820dcc509a6f75849b'::text) > Bitmap Index Scan on tuppermc1 (cost0.00..4.47 rows25 width0) Index Cond: (upper(mc) 'c4ca4238a0b923820dcc509a6f75849b'::text) (6 rows)

本文介绍使用SELECT语法时，not in中包含了null，结果全为真的场景。 teledb select from teledbpg where id not in (1,3); id nickname + 2 TELEDB 4 (2 rows) teledb select from teledbpg where id not in (1,3,null); id nickname + (0 rows)

本文介绍只查询某个DN数据的操作。 teledb execute direct on (dn01) 'select from teledbpg'; id nickname + 1 teledb 1 hello,pgxc 2 TELEDB (3 rows) teledb execute direct on (dn02) 'select from teledbpg'; id nickname + 3 pg 4 (2 rows)

本文介绍如何在使用SELECT语法时进行聚集查询，例如统计记录数、不重复值的记录表，以及求和等。 统计记录数。 teledb select count(1) from teledbpg; count 5 (1 row) 统计不重复值的记录表。 teledb select count(distinct id) from teledbpg; count 4 (1 row) 求和。 teledb select sum(id) from teledbpg; sum 11 (1 row) 求最大值。 teledb select max(id) from teledbpg; max 4 (1 row) 求最小值。 teledb select min(id) from teledbpg; min 1 (1 row) 求平均值。 teledb select avg(id) from teledbpg; avg 2.2000000000000000 (1 row)

本文介绍如何在使用SELECT语法时添加all条件。 需要大于所有值才为真。 teledb select from teledbpg where id > all (select 1 union select 3); id nickname + 4 (1 row)

本文为您介绍如何删除数据表。 删除当前模式下的数据表。 teledb drop table t; DROP TABLE 删除某个模式下数据表。 teledb d+ t Table "public.t" Column Type Collation Nullable Default Storage Stats target Description +++++++ id integer plain mc text extended Distribute By: SHARD(id) Location Nodes: ALL DATANODES teledb d+ tas Table "public.tas" Column Type Collation Nullable Default Storage Stats target Description +++++++ id integer plain mc text extended Distribute By: SHARD(id) Location Nodes: ALL DATANODES teledb drop table public.test; DROP TABLE 删除数据表，当表不存在时不执行该操作，也不会报错。 teledb drop table IF EXISTS t; NOTICE: table "t" does not exist, skipping DROP TABLE 使用CASCADE无条件删除数据表。 teledb create view shardview as select from testshard; CREATE VIEW teledb drop table testshard; ERROR: cannot drop table testshard because other objects depend on it DETAIL: view shardview depends on table testshard HINT: Use DROP ... CASCADE to drop the dependent objects too. teledb drop table testshard cascade; NOTICE: drop cascades to view shardview DROP TABLE

本文为您介绍SELECT语法中多表关联的使用方法。 内连接 teledb select from teledbpg inner join teledbpg1 on teledbpg.id teledbpg1.id; id nickname id nickname +++ 3 pg 3 pg (1 row) 左外连接 teledb select from teledbpg left join teledbpg1 on teledbpg.id teledbpg1.id; id nickname id nickname +++ 1 teledb 1 hello,pgxc 2 TELEDB 3 pg 3 pg 4 (5 rows) 右外连接 teledb select from teledbpg right join teledbpg1 on teledbpg.id teledbpg1.id; id nickname id nickname +++ 5 test 3 pg 3 pg (2 rows) 全连接 teledb select from teledbpg full join teledbpg1 on teledbpg.id teledbpg1.id; id nickname id nickname +++ 1 teledb 3 pg 3 pg 4 1 hello,pgxc 2 TELEDB 5 test (6 rows)

exists 只要有记录返回就为真 teledb select from teledbpg where exists(select from person where person.id teledbpg.id); id nickname + 1 teledb 1 hello,pgxc 2 TELEDB 3 pg (4 rows) exists 等价写法 teledb select teledbpg. from teledbpg, (select distinct id from person) as t where t.id teledbpg.id; id nickname + 1 teledb 1 hello,pgxc 2 TELEDB 3 pg (4 rows)

本文为您介绍如何增加一个复合类型。 增加一个复合类型 teledb create type mytype as (f1 int,f2 varchar(10)); CREATE TYPE

创建jsonb类型字段表 teledb create table tjsonb(id int,fjsonb jsonb); CREATE TABLE 插入数据 teledb insert into tjsonb values(1,'{"col1":1,"col2":"teledb"}'); INSERT 0 1 teledb insert into tjsonb values(2,'{"col1":1,"col2":"teledb","col3":"pgxz"}'); INSERT 0 1 teledb select from tjsonb; id fjsonb + 1 {"col1": 1, "col2": "teledb"} 2 {"col1": 1, "col2": "teledb", "col3": "pgxz"} (2 rows jsonb插入时会移除重复的键，如下所示。 teledb insert into tjsonb values(3,'{"col1":1,"col2":"teledb","col2":"pgxz"}'); INSERT 0 1 teledb select from tjsonb; id fjsonb + 1 {"col1": 1, "col2": "teledb"} 2 {"col1": 1, "col2": "teledb", "col3": "pgxz"} 3 {"col1": 1, "col2": "pgxz"} (3 rows) 更新数据 增加元素。 teledb update tjsonb set fjsonb fjsonb '{"col3":"pgxz"}'::jsonb where id1; UPDATE 1 teledb select from tjsonb; id fjsonb + 2 {"col1": 1, "col2": "teledb", "col3": "pgxz"} 1 {"col1": 1, "col2": "teledb", "col3": "pgxz"} 3 {"col1": 1, "col2": "pgxz"} (3 rows) 更新原来的元素。 teledb

创建json 类型字段表 teledb create table tjson(id int,fjson json); CREATE TABLE 插入数据 teledb insert into tjson values(1,'{"col1":1,"col2":"teledb"}'); INSERT 0 1 teledb insert into tjson values(2,'{"col1":1,"col2":"teledb","col3":"pgxz"}'); INSERT 0 1 teledb select from tjson; id fjson + 1 {"col1":1,"col2":"teledb"} 2 {"col1":1,"col2":"teledb","col3":"pgxz"} (2 rows) 通过键获得json对象域 teledb select fjson >'col2' as col2 ,fjson > 'col3' as col3 from tjson; col2 col3 + "teledb" "teledb" "pgxz" (2 rows) 以文本形式获取对象值 teledb select fjson >>'col2' as col2 ,fjson >> 'col3' as col3 from tjson; col2 col3 + teledb teledb pgxz (2 rows) teledb select fjson >>'col2' as col2 ,fjson >> 'col3' as col3 from tjson where fjson >> 'col3' is not null; col2 col3 + teledb pgxz (1 row)

本文介绍如何在使用SELECT语法时进行聚合函数并发计算。 teledb set maxparallelworkerspergather to 0; SET Time: 0.214 ms teledb select count(1) from tcount; count 20000000 (1 row) Time: 2700.569 ms (00:02.701) teledb set maxparallelworkerspergather to 2; SET Time: 0.269 ms teledb select count(1) from tcount; count 20000000 (1 row) Time: 1867.719 ms (00:01.868)

本文介绍如何在使用SELECT语法时，返回两个结果的交集。 teledb select from teledbpg intersect select from teledbpg1; id nickname + 3 pg (1 row)

本文介绍如何在使用SELECT语法时，返回两个结果的差集。 teledb select from teledbpg except select from teledbpg1; id nickname + 2 TELEDB 4 1 teledb 1 hello,pgxc (4 rows)

本文为您介绍如何管理视图，包括创建视图、删除视图和物化视图使用。 创建视图 teledb create view trangeview as select from trange; CREATE VIEW teledb select from trangeview; f1 f2 f3 ++ 1 20230822 11:06:16.9783 1 2 20230822 11:06:16.9783 50 2 20230822 11:06:16.9783 110 3 20230822 11:06:16.9783 100 (4 rows) 数据类型重定义。 teledb drop view trangeview; DROP VIEW teledb create view trangeview as select f1,f2::date from trange; CREATE VIEW teledb select from trangeview; f1 f2 + 1 20230822 3 20230822 2 20230822 2 20230822 (4 rows) 数据类型重定义，以及取别名。 teledb drop view trangeview; DROP VIEW teledb create view trangeview as select f1,f2::date as mydate from trange; CREATE VIEW teledb select from trangeview; f1 mydate + 1 20230822 2 20230822 2 20230822 3 20230822 (4 rows) TeleDB 支持视图引用表或字段改名联动，不受影响。 teledb d+ trangeview View "teledb.trangeview" Column Type Collation Nullable Default Storage Description ++++++ f1 bigint plain mydate date plain View definition: SELECT trange.f1, trange.f2::date AS mydate FROM trange; teledb

本文为您介绍如何管理分区表全局索引。 支持创建分区表全局索引，目前仅支持btree索引类型 建表 CREATE TABLE parentrangetbl( c1 int not null, c2 int not null, c3 int not null ) PARTITION BY RANGE (c1); CREATE TABLE part0100 PARTITION OF parentrangetbl FOR VALUES FROM (0) TO (100); CREATE TABLE part100200 PARTITION OF parentrangetbl FOR VALUES FROM (100) TO (200); CREATE TABLE partdefault PARTITION OF parentrangetbl DEFAULT; 插入数据 INSERT INTO parentrangetbl(c1,c2,c3) SELECT generateseries(50, 100) AS c1, generateseries(50, 100) AS c2, generateseries(50, 100) AS c3; 创建全局索引 CREATE INDEX c3globalidx ON parentrangetbl(c3) GLOBAL; 设置不使用seq scan set enableseqscan TO off; 通过全局索引查询数据 EXPLAIN SELECT c3 FROM parentrangetbl WHERE c3 > 70 AND c3 Index Only Scan using c3globalidx on parentrangetbl (cost0.12..8.14 rows9 width4) Index Cond: ((c3 > 70) AND (c3 < 75)) (3 rows)

本文为您介绍如何创建唯一索引。 创建唯一索引 teledb create unique index tasiduidx on tas using btree(id); CREATE INDEX 非shard key 字段不能建立唯一索引 teledb create unique index tasiduidx on tas using btree(mc); ERROR: Unique index of partitioned table must contain the hash/modulo distribution column.

本页为您介绍如何使用使用 IF NOT EXISTS关键字。 带IF NOT EXISTS 关键字作用表示表不存在时才创建。 teledb create table t(id int,mc text); CREATE TABLE teledb create table t(id int,mc text); ERROR: relation "t" already exists teledb create table IF NOT EXISTS t(id int,mc text); NOTICE: relation "t" already exists, skipping CREATE TABLE

d+ tnativemullistgd Table "public.tnativemullistgd" Column Type Collation Nullable Default Storage Stats target Description ++++++ + f1 bigint not null nextval('tnativemullistf1seq'::regclass) plain f2 integer plain f3 text extended f4 text extended f5 timestamp(0) without time zone plain Partition of: tnativemullist FOR VALUES IN ('广东') Partition constraint: ((f3 IS NOT NULL) AND (f3 ANY (ARRAY['广东'::text]))) Partition key: RANGE (f5) Partitions: tnativemullistgd201701 FOR VALUES FROM ('20170101 00:00:00') TO ('20170201 00:00:00'), tnativemullistgd201702 FOR VALUES FROM ('20170201 00:00:00') TO ('20170301 00:00:00') Distribute By: SHARD(f1) Location Nodes: ALL DATANODES TeleDB支持存在1级和2级分区混用，大家不需要都平级。