1.sql複製原表資料結構
create table au.test1 as select * from au.config where 1=2;
2.在複製的新錶中的某列插入原始資料
insert into au.test 1(uuid) select uuid from au.config;
3.將其它列資料複製到新錶中
update au.test1 a set (name) = (select name from config where uuid = a.uuid);
4.將表擁有者賦予c:alter table a.a_text owner to c;
5.查詢db資料庫所佔記憶體大小：select pg_size_pretty(pg_database_size('db'));
6.查詢test表所佔記憶體大小：select pg_size_pretty(pg_relation_size('test'));
7.查詢資料庫中所有表所佔記憶體大小：
select
schemaname || '.' || tablename as table_full_name,
pg_size_pretty(pg_total_relation_size('"' || schemaname || '"."' || tablename || '"')) as size
from pg_tables
order by
pg_total_relation_size('"' || schemaname || '"."' || tablename || '"') desc
8.pgxl建立表兩種模式：複製模式和分片模式。
create table table_name(...)
distribute by
hash(col)|modulo(col)|roundrobin|replication
to node(nodename1,nodename2...)
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