|
SQL>
SQL> create table t as select * from all_objects;
Table created.
SQL>
SQL> set autotrace on
SQL> select count(*) from t;
COUNT(*)
----------
12586
Execution Plan
----------------------------------------------------------
Plan hash value: 2966233522
-----------------------------------
| Id | Operation | Name |
-----------------------------------
| 0 | SELECT STATEMENT | |
| 1 | SORT AGGREGATE | |
| 2 | TABLE ACCESS FULL| T |
-----------------------------------
Note
-----
- rule based optimizer used (consider using cbo)
Statistics
----------------------------------------------------------
1 recursive calls
0 db block gets
163 consistent gets
159 physical reads
0 redo size
413 bytes sent via SQL*Net to client
380 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
SQL>
SQL>
SQL> set autotrace off
SQL>
SQL> delete from t where owner <> 'SCOTT';
12586 rows deleted.
SQL>
SQL> set autotrace on
SQL> select count(*) from t;
COUNT(*)
----------
0
Execution Plan
----------------------------------------------------------
Plan hash value: 2966233522
-----------------------------------
| Id | Operation | Name |
-----------------------------------
| 0 | SELECT STATEMENT | |
| 1 | SORT AGGREGATE | |
| 2 | TABLE ACCESS FULL| T |
-----------------------------------
Note
-----
- rule based optimizer used (consider using cbo)
Statistics
----------------------------------------------------------
0 recursive calls
0 db block gets
163 consistent gets
0 physical reads
0 redo size
410 bytes sent via SQL*Net to client
380 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
SQL>
SQL>
SQL> set autotrace off
SQL> alter table t move;
Table altered.
SQL> set autotrace on
SQL> select count(*) from t;
COUNT(*)
----------
0
Execution Plan
----------------------------------------------------------
Plan hash value: 2966233522
-----------------------------------
| Id | Operation | Name |
-----------------------------------
| 0 | SELECT STATEMENT | |
| 1 | SORT AGGREGATE | |
| 2 | TABLE ACCESS FULL| T |
-----------------------------------
Note
-----
- rule based optimizer used (consider using cbo)
Statistics
----------------------------------------------------------
1 recursive calls
0 db block gets
3 consistent gets
0 physical reads
0 redo size
410 bytes sent via SQL*Net to client
380 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
SQL>
SQL> set autotrace off
SQL>
SQL> drop table t;
Table dropped.
|