drop table DEMO purge;

create table DEMO(
	 id INTEGER generated always as identity
	,day DATE not null
	,code VARCHAR2(2) not null
	,val NUMBER not null
	,PRIMARY KEY(id)
) 
partition by range(day)(
      partition P_2024_01 values less than (date'2024-02-01')
     ,partition P_2024_02 values less than (date'2024-03-01')
     ,partition P_2024_03 values less than (date'2024-04-01')
     ,partition P_2024_04 values less than (date'2024-05-01')
     ,partition P_2024_05 values less than (date'2024-06-01')
     ,partition P_2024_06 values less than (date'2024-07-01')
     ,partition INFINITY  values less than (MAXVALUE)
    )
;

create index IDX_VAL on DEMO(val) local;

insert /*+ APPEND */ into DEMO (day,code,val)
select
	 DATE'2024-01-01' + trunc(DBMS_RANDOM.VALUE(1,30*4))
	,DECODE(trunc(DBMS_RANDOM.VALUE(1,10)),
		 1,  'UK'
		,2,  'UK'
		,3,  'UK'
		,4,  'UK'
		,5,  'UK'
		,6,  'IT'
		,7,  'IT'
		,8,  'FR'
		,9,  'FR'
		,10, 'FR'
	)
	,trunc(DBMS_RANDOM.VALUE(1,10000))
from 
	xmltable('1 to 4000000')
;

commit;


exec dbms_stats.gather_table_stats(user,'DEMO');
exec dbms_stats.delete_table_stats(user,'DEMO');

exec DBMS_STATS.SET_TABLE_PREFS(ownname=>'POC',tabname=>'DEMO', pname=>'INCREMENTAL', pvalue=>'TRUE');
exec DBMS_STATS.SET_TABLE_PREFS(ownname=>'POC',tabname=>'DEMO', pname=>'GRANULARITY', pvalue=>'PARTITION');

exec DBMS_STATS.SET_TABLE_PREFS(ownname=>'POC',tabname=>'DEMO', pname=>'INCREMENTAL', pvalue=>'FALSE');
exec DBMS_STATS.SET_TABLE_PREFS(ownname=>'POC',tabname=>'DEMO', pname=>'GRANULARITY', pvalue=>'AUTO');


execute dbms_stats.gather_table_stats(ownname=>'POC',tabname=>'DEMO', partname=>'P_2024_01');

execute dbms_stats.delete_table_stats(ownname=>'POC',tabname=>'DEMO', partname=>'P_2024_06');
execute dbms_stats.gather_table_stats(ownname=>'POC',tabname=>'DEMO', partname=>'P_2024_06');
execute dbms_stats.gather_table_stats(ownname=>'POC',tabname=>'DEMO', partname=>'P_2024_06',granularity=>'PARTITION');


alter table POC.DEMO drop partition P_2024_05 update global indexes;
alter table POC.DEMO drop partition P_2024_06 update global indexes;
alter table POC.DEMO drop partition INFINITY update global indexes;

alter table DEMO set interval(NUMTOYMINTERVAL(1, 'MONTH'));

insert /*+ APPEND */ into DEMO (day,code,val)
select
	 DATE'2024-07-01' + trunc(DBMS_RANDOM.VALUE(1,30*1))
	,DECODE(trunc(DBMS_RANDOM.VALUE(1,10)),
		 1,  'UK'
		,2,  'UK'
		,3,  'UK'
		,4,  'UK'
		,5,  'UK'
		,6,  'IT'
		,7,  'IT'
		,8,  'FR'
		,9,  'FR'
		,10, 'FR'
	)
	,trunc(DBMS_RANDOM.VALUE(1,10000))
from 
	xmltable('1 to 1000000')
;

commit;