Re: does refreshing materialized view make the database bloat?

Hi.

In the following example, I cannot see bloat (via extension pgstattuple dead_tuple_count>0). Wondering where the bloat is.

BEGIN;create table tbt( a int) with(fillfactor=40, autovacuum_enabled=off);
insert into tbt  select g from generate_series(1,2000) g;
create materialized view tbtmv as select * from tbt;
commit;

--------do the update.
update tbt set a = 10 + a  where a < 20;
REFRESH MATERIALIZED view tbtmv;
SELECT * FROM pgstattuple('tbtmv'); -----no dead tuples count.

------try delete.
delete  from tbt  where a < 50;
REFRESH MATERIALIZED view tbtmv;
SELECT * FROM pgstattuple('tbtmv');-------still no dead tuples.