openGauss每日一练第10天 | 分区表索引

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 products
(
c1 int,
c2 char(2)
)
partition by range (c1)
(
partition p0 values less than (10),
partition p1 values less than (20)
);

create index idx1 on products(c1) local;

create index idx2 on products(c1) local
(
partition idx_c1_p0,
partition idx_c1_p1
);

create index idx3 on products(c2) global;

\d+ products

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

create tablespace tspc_idx1 relative location 'tablespace1/tspc_idx1';
create tablespace tspc_idx2 relative location 'tablespace1/tspc_idx2';

alter index idx1 move partition p0_c1_idx tablespace tspc_idx1;
alter index idx1 move partition p1_c1_idx tablespace tspc_idx2;

alter index idx1 rename partition p0_c1_idx to p0_c1_idx_1;

\d+ products

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 idx2 partition idx_c1_p0;
reindex table products partition p0;

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

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

5.删除索引、表和表空间

drop index idx1, idx2, idx3;
drop table products;
drop tablespace tspc_idx1;
drop tablespace tspc_idx2;