2026-03-12 21:01:38

materialized_views/mw02.txt

@@ -0,0 +1,127 @@
+alias DEMO='rlwrap sqlplus DEMO/"secret"@bakura:1521/NIHILUS'
+
+drop table T1 purge;
+create table T1 (
+    id number generated always as identity,
+    n1 number(1),
+    c1 varchar2(10),
+    d1 DATE	
+);
+
+alter table T1 add constraint T1_PK primary key (ID);
+
+
+-- infinite_update2.sql
+whenever sqlerror exit failure
+declare
+  i NUMBER;
+begin
+	i:=0;
+   loop 
+     i:=i+1;
+     insert into T1(n1,c1,d1) values(mod(i,3),DBMS_RANDOM.string('a',10),sysdate);
+     commit; 
+     dbms_session.sleep(1);
+   end loop;
+end;
+/
+
+
+drop materialized view MW0;
+drop materialized view MW1;
+drop materialized view MW2;
+
+create materialized view MW0 as select * from T1 where n1=0;
+create materialized view MW1 as select * from T1 where n1=1;
+create materialized view MW2 as select * from T1 where n1=2;
+
+
+alter session set NLS_DATE_FORMAT='YYYY-MM-DD HH24:MI:SS';
+select max(d1) from MW0;
+select max(d1) from MW1;
+select max(d1) from MW2;
+
+create materialized view log on T1 with primary key including new values;
+
+set lines 256
+
+col log_table for a30
+col log_trigger for a30
+col primary_key for a3 head PK
+
+select log_table,log_trigger,primary_key from dba_mview_logs where log_owner='DEMO' and MASTER='T1';
+
+
+-- on snap "server" site
+
+set lines 256
+
+col	owner for a15
+col	name for a25
+col	master_owner for a15
+col	master for a25
+col	master_link for a25
+col	refresh_method for a15
+col	type for a10
+col	status for a7
+col	snaptime for a20
+
+select 
+	snap.owner
+	,snap.name
+	,snap.snapid
+	,snap.status
+	,slog.snaptime
+	,snap.master_owner
+	,snap.master
+	,snap.refresh_method
+	,snap.type
+	,snap.master_link
+from 
+	sys.slog$ slog
+join dba_snapshots snap on slog.snapid=snap.snapid
+where slog.mowner='DEMO' and slog.master='T1';
+
+
+col snapname for a30
+col snapsite for a30
+col snaptime for a30
+
+select 
+	r.name snapname, snapid, nvl(r.snapshot_site, 'not registered') snapsite, snaptime 
+from   
+	sys.slog$ s, dba_registered_snapshots r
+where  
+	s.snapid=r.snapshot_id(+) and mowner='DEMO' and master='T1';                                                                                           
+
+
+exec dbms_mview.refresh('MW0');
+exec dbms_mview.refresh('MW1');
+exec dbms_mview.refresh('MW2');
+
+-- point of view of snap "client"
+select last_refresh_date,sysdate from dba_mviews where mview_name='MW0';
+
+-- point of view of snap "server"
+select sysdate,last_refresh from dba_snapshots where name='MW0';
+
+
+select log_table from dba_mview_logs where master='T1';
+ 
+select count(*) from DEMO.MLOG$_T1;
+
+
+exec dbms_refresh.make('MWGROUP0', list=>'MW0,MW1', next_date=>null, interval=>'null',parallelism=>2);
+
+exec dbms_refresh.refresh('MWGROUP0');
+
+
+-- https://www.oracleplsqltr.com/2021/03/14/how-to-unregister-materialized-view-from-source-db/
+
+exec dbms_mview.unregister_mview(mviewowner=>'DEMO',mviewname=>'MW2',mviewsite=>'NIHILUS');
+exec dbms_mview.purge_mview_from_log(mview_id=>9);
+
+select segment_name,bytes/1024 Kb from dba_segments where segment_name='MLOG$_T1';
+
+
+