2026-03-12 21:01:38

sqlmon/sqlmon_01.txt

@@ -0,0 +1,59 @@
+-- Setup
+--------
+drop table T1 purge;
+
+create table T1 
+  tablespace USERS
+  as 
+  select * from dba_extents
+;
+
+drop table T2 purge;
+
+create table T2 
+  tablespace USERS
+  as 
+  select * from dba_extents
+;
+
+
+insert into T1 select * from T1;
+
+insert into T2 select * from T2;
+insert into T2 select * from T2;
+insert into T2 select * from T2;
+
+commit;
+
+create index I1 on T1(OWNER) tablespace USERS;
+create index I2 on T2(OWNER) tablespace USERS;
+
+exec dbms_stats.delete_table_stats(user,'T1');
+exec dbms_stats.delete_table_stats(user,'T2');
+
+exec dbms_stats.gather_table_stats(user,'T1', method_opt=>'for all columns size 1');
+exec dbms_stats.gather_table_stats(user,'T2', method_opt=>'for all columns size 1');
+
+exec dbms_stats.gather_table_stats(user,'T1', method_opt=>'for all columns size skewonly');
+exec dbms_stats.gather_table_stats(user,'T2', method_opt=>'for all columns size skewonly');
+
+
+set lines 250 pages 999
+alter system flush shared_pool;
+
+var MYOWNER varchar2(30);
+
+execute :MYOWNER:='DBSNMP';
+
+select /*+ GATHER_PLAN_STATISTICS MONITOR */
+  count(1)
+from
+    T1,
+    T2
+where
+  T1.OWNER=:MYOWNER and
+  T1.BLOCKS=T2.BLOCKS
+/
+
+select * from table(dbms_xplan.display_cursor(null,null,'ALLSTATS LAST  +PEEKED_BINDS +PARALLEL +PARTITION +COST +BYTES'));
+