openGauss每日一练第10天 | 学习心得体会
补之前的作业。今天(2021年12月26日)朋友推荐我看这个教程。
一下午都在做这个作业，每行代码都通过墨天轮的平台验证过了。
做完作业有个考试，91分通过。
总体感觉这个课程还是很不错的，一共21天，下面是第10天的作业内容。
10.1 分区表索引
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 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 tpcds.products_index1 ON tpcds.products(CA_ADDRESS_SK) LOCAL;
CREATE INDEX tpcds.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 tpcds.products_index3 ON tpcds.products(CA_ADDRESS_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
//通过下面命令查看表分区，因为索引1是自动创建，名字不明；
\d+ tpcds.products;
ALTER INDEX tpcds.products_index1 MOVE PARTITION p1_ca_address_sk_idx TABLESPACE example1;
ALTER INDEX tpcds.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.products_index2 PARTITION ca_address_sk_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_index1;
DROP INDEX tpcds.products_index2;
DROP INDEX tpcds.products_index3;
DROP INDEX tpcds.products_index4;
drop table tpcds.products;
DROP TABLESPACE IF EXISTS example1;
DROP TABLESPACE IF EXISTS example2;
DROP TABLESPACE IF EXISTS example3;
DROP TABLESPACE IF EXISTS example4;
=========================
