demo08.sql

Expert Oracle Database Architecture 9i and 10g sql源码

CREATE TABLE partitioned_table
( a int,
  b int,
  data char(20)
)
PARTITION BY RANGE (a)
(
PARTITION part_1 VALUES LESS THAN(2) tablespace p1,
PARTITION part_2 VALUES LESS THAN(3) tablespace p2
)
/
create index local_prefixed on partitioned_table (a,b) local;
create index local_nonprefixed on partitioned_table (b) local;
insert into partitioned_table
select mod(rownum-1,2)+1, rownum, 'x'
  from all_objects;
begin
   dbms_stats.gather_table_stats
   ( user,
    'PARTITIONED_TABLE',
     cascade=>TRUE );
end;
/
alter tablespace p2 offline;
select * from partitioned_table where a = 1 and b = 1;
delete from plan_table;
explain plan for
select * from partitioned_table where a = 1 and b = 1;
select * from table(dbms_xplan.display);
select * from partitioned_table where b = 1;
delete from plan_table;
explain plan for
select * from partitioned_table where b = 1;
select * from table(dbms_xplan.display);
drop index local_prefixed;
select * from partitioned_table where a = 1 and b = 1;
delete from plan_table;
explain plan for
select * from partitioned_table where a = 1 and b = 1;
select * from table(dbms_xplan.display);