创建列存储分区表
更新时间 2025-02-05 09:36:50
最近更新时间: 2025-02-05 09:36:50
本页介绍天翼云TeleDB数据库创建列存储分区表的语法。
列存储引擎中分区表主表作为逻辑表仍是行存结果，实际存储数据的分区表需要指定使用USING PAX 命令创建，创建一个 HASH 分区的列存储分区表如下：
teledb=# create table test_hash (
teledb(# "userid" int4 not null,
teledb(# "name" varchar(64))
teledb-# partition by hash(userid);
CREATE TABLE
teledb=# create table test_hash_c1 partition of test_hash for values WITH (modulus 4, remainder 0) using pax;
CREATE TABLE
teledb=# create table test_hash_c2 partition of test_hash for values WITH (modulus 4, remainder 1) using pax;
CREATE TABLE
teledb=# create table test_hash_c3 partition of test_hash for values WITH (modulus 4, remainder 2) using pax;
CREATE TABLE
teledb=# create table test_hash_c4 partition of test_hash for values WITH (modulus 4, remainder 3) using pax;
CREATE TABLE
teledb=# \d+ test_hash
Table "public.test_hash"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+-----------------------+-----------+----------+---------+----------+--------------+-------------
userid | integer | | not null | | plain | |
name | character varying(64) | | | | extended | |
Partition key: HASH (userid)
Partitions: test_hash_c1 FOR VALUES WITH (modulus 4, remainder 0),
test_hash_c2 FOR VALUES WITH (modulus 4, remainder 1),
test_hash_c3 FOR VALUES WITH (modulus 4, remainder 2),
test_hash_c4 FOR VALUES WITH (modulus 4, remainder 3)
Distribute By: HASH(userid)
Location Nodes: ALL DATANODES
