openGauss每日一练第 10天|分区表索引

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 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.products
(
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
);


CREATE INDEX ds_products_index1 ON tpcds.products(CA_ADDRESS_SK) LOCAL;

CREATE INDEX ds_products_index2 ON
tpcds.products(CA_ADDRESS_SK) LOCAL
(
PARTITION CA_ADDRESS_SK_index1,
PARTITION CA_ADDRESS_SK_index2 TABLESPACE example3,
PARTITION CA_ADDRESS_SK_index3 TABLESPACE example4
);

CREATE INDEX ds_products_index3 ON tpcds.products(CA_ADDRESS_ID) GLOBAL;

CREATE INDEX ds_products_index4 ON tpcds.products(CA_ADDRESS_ID);

\d+ tpcds.products;

可以看出系统自动对分区表索引1进行了索引分区的命名

select * from pg_indexes where tablename = 'products';

select * from pg_partition;

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.ds_products_index1 MOVE PARTITION
p1_ca_address_sk_idx TABLESPACE example1;

ALTER INDEX tpcds.ds_products_index1 RENAME PARTITION
p1_ca_address_sk_idx  TO p4_ca_address_sk_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.ds_products_index2 PARTITION CA_ADDRESS_SK_index2;

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

select * from pg_indexes where tablename = 'products';

select * from pg_partition;

5.删除索引、表和表空间

drop index tpcds.ds_products_index1;
drop index tpcds.ds_products_index2;
drop index tpcds.ds_products_index3;
drop index tpcds.ds_products_index4;



drop table tpcds.products;
drop schema tpcds;
drop tablespace example1;
drop tablespace example2;
drop tablespace example3;
drop tablespace example4;