openGauss每日一练第10天 | 分区表索引

第十课

10.1 打卡第10天 | 分区表索引

👉openGauss SQL学习参考资料
https://opengauss.org/zh/docs/2.1.0/docs/Developerguide/SQL%E8%AF%AD%E6%B3%95.html

学习目标

学习openGauss分区表索引

课程学习

连接数据库

#第一次进入等待15秒
#数据库启动中...
su - omm
gsql -r

1.创建分区表索引

CREATE TABLESPACE example1 RELATIVE LOCATION 'tablespace1/tablespace_1';
CREATE TABLESPACE example2 RELATIVE LOCATION 'tablespace2/tablespace_2';
CREATE TABLESPACE example3 RELATIVE LOCATION 'tablespace3/tablespace_3';
CREATE TABLESPACE example4 RELATIVE LOCATION 'tablespace4/tablespace_4';
create schema tpcds;
CREATE TABLE tpcds.customer_address_p1
(
CA_ADDRESS_SK INTEGER NOT NULL,
CA_ADDRESS_ID CHAR(16) NOT NULL,
CA_STREET_NUMBER CHAR(10) ,
CA_STREET_NAME VARCHAR(60) ,
CA_STREET_TYPE CHAR(15) ,
CA_SUITE_NUMBER CHAR(10) ,
CA_CITY VARCHAR(60) ,
CA_COUNTY VARCHAR(30) ,
CA_STATE CHAR(2) ,
CA_ZIP CHAR(10) ,
CA_COUNTRY VARCHAR(20) ,
CA_GMT_OFFSET DECIMAL(5,2) ,
CA_LOCATION_TYPE CHAR(20)
)
PARTITION BY RANGE(CA_ADDRESS_SK)
(
PARTITION p1 VALUES LESS THAN (3000),
PARTITION p2 VALUES LESS THAN (5000) TABLESPACE example1,
PARTITION p3 VALUES LESS THAN (MAXVALUE) TABLESPACE example2
);

–创建分区表索引ds_customer_address_p1_index1，不指定索引分区的名称

CREATE INDEX ds_customer_address_p1_index1 ON tpcds.customer_address_p1(CA_ADDRESS_SK) LOCAL;

–创建分区表索引ds_customer_address_p1_index2，并指定索引分区的名称。

CREATE INDEX ds_customer_address_p1_index2 ON
tpcds.customer_address_p1(CA_ADDRESS_SK) LOCAL
(
PARTITION CA_ADDRESS_SK_index1,
PARTITION CA_ADDRESS_SK_index2 TABLESPACE example3,
PARTITION CA_ADDRESS_SK_index3 TABLESPACE example4
);

–创建GLOBAL分区索引

CREATE INDEX ds_customer_address_p1_index3 ON tpcds.customer_address_p1(CA_ADDRESS_ID) GLOBAL;

–不指定关键字，默认创建GLOBAL分区索引

CREATE INDEX ds_customer_address_p1_index4 ON tpcds.customer_address_p1(CA_ADDRESS_ID);

–查看索引信息

\d+ tpcds.customer_address_p1;
select * from pg_indexes where tablename = 'customer_address_p1';
select * from pg_partition;

2.修改分区表索引定义

–修改分区表索引CA_ADDRESS_SK_index2的表空间为example1

ALTER INDEX tpcds.ds_customer_address_p1_index2 MOVE PARTITION
CA_ADDRESS_SK_index2 TABLESPACE example1;

–修改分区表索引CA_ADDRESS_SK_index3的表空间为example2

ALTER INDEX tpcds.ds_customer_address_p1_index2 MOVE PARTITION
CA_ADDRESS_SK_index3 TABLESPACE example2;

–重命名分区表索引

ALTER INDEX tpcds.ds_customer_address_p1_index2 RENAME PARTITION
CA_ADDRESS_SK_index1 TO CA_ADDRESS_SK_index4;

3.重建索引分区

–重建单个索引分区

reindex index tpcds.ds_customer_address_p1_index1 PARTITION p1_ca_address_sk_idx;

–重建分区上的所有索引

reindex table tpcds.customer_address_p1 PARTITION p1;

4.删除索引

DROP INDEX tpcds.ds_customer_address_p1_index1;
DROP INDEX tpcds.ds_customer_address_p1_index2;
DROP INDEX tpcds.ds_customer_address_p1_index3;
DROP INDEX tpcds.ds_customer_address_p1_index4;

课程作业

1.创建范围分区表products, 为表创建分区表索引1，不指定索引分区的名称，创建分区表索引2，并指定索引分区的名称，创建GLOBAL分区索引3

CREATE TABLE tpcds.products
(
id INTEGER NOT NULL,
name CHAR(16) NOT NULL,
category CHAR(20) ,
price DECIMAL(10,2)
)
PARTITION BY RANGE(id)
(
PARTITION p1 VALUES LESS THAN (50),
PARTITION p2 VALUES LESS THAN (100) TABLESPACE example1,
PARTITION p3 VALUES LESS THAN (MAXVALUE) TABLESPACE example2
);
CREATE INDEX products_p1_index1 ON tpcds.products(id) LOCAL;
CREATE INDEX products_p1_index2 ON
tpcds.products(id) LOCAL
(
PARTITION products_index1,
PARTITION products_index2 TABLESPACE example3,
PARTITION products_index3 TABLESPACE example4
);
CREATE INDEX products_p1_index3 ON tpcds.products(id) GLOBAL;

2.在分区表索引1上，修改分区表索引的表空间，重命名分区表索引

ALTER INDEX tpcds.products_p1_index1 MOVE PARTITION
p1_id_idx TABLESPACE example2;
ALTER INDEX tpcds.products_p1_index1 RENAME PARTITION
p1_id_idx TO new_p1_id_idx;

3.在分区表索引2上，重建单个索引分区和分区上的所有索引

reindex index tpcds.products_p1_index2 PARTITION products_index1;
reindex table tpcds.products PARTITION p1;

4.使用\d+、系统视图pg_indexes和pg_partition查看索引信息

\d+ tpcds.products;
select * from pg_indexes where tablename = 'products';
select * from pg_partition;

5.删除索引、表和表空间

drop index tpcds.products_p1_index1;
drop index tpcds.products_p1_index2;
drop index tpcds.products_p1_index3;
drop TABLESPACE example1;
drop TABLESPACE example2;
drop TABLESPACE example3;
drop TABLESPACE example4;