Greenplum常用sql语句

1. 查看表使用空间

SELECT *

FROM PUBLIC.dba_segments

WHERE owner LIKE 'owber_name'

AND table_name LIKE '%table_name%'

ORDER BY table_name;

2. GP中查看分区：

select partitionname,partitionboundary from pg_partitions where tablename='table_name';

select partitionname,partitionboundary from pg_catalog.pg_partitions where tablename='table_name';

3. 查看正在运行的sql

select * from pg_stat_activity;

4. 修改表的owner语句

Alter table table_name owner to owner_name;

5. 增加表分区

ALTER TABLE table_name ADD PARTITION P20091001 START (DATE '2009-10-01') INCLUSIVE END (DATE '2009-10-02') EXCLUSIVE WITH(appendonly=true,compresslevel=5);

6. 修改列类型

ALTER TABLE table_name ALTER COLUMN a TYPE varchar(2048);

7. 修改distributed 列

alter table table_name set distributed by(column_1);