Just wondering here but has anyone tried doing that select from something
like v$database;
Statistics
----------------------------------------------------------
0 recursive calls
0 db block gets
0 consistent gets
0 physical reads
0 redo size
187 bytes sent via SQL*Net to client
248 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
that looks pretty good to me!!
-----Original Message-----
Sent: Friday, August 02, 2002 11:13 AM
To: Multiple recipients of list ORACLE-L
I've been reading the thread on DUAL vs X$DUAL, read the referenced article
and tried some testing on our system. I do a simple select from DUAL and I
get the same statistics as were in the article, but sometimes I also get 1
memory sort. Does anyone know why this would be? And if this is true, that
really makes me want to change over to X$DUAL. Also, what is the consensus
about creating a view for DUAL that references X$DUAL? I'm running the
Oracle Application and cannot change all of their code to use something
other than DUAL, and there is a lot of it.
Here are the statistics on the select. Notice the difference between the
first vs repeat of the same seelct.
Connected to:
Oracle8i Enterprise Edition Release 8.1.7.1.1 - Production
With the Partitioning option
JServer Release 8.1.7.1.1 - Production
SQL> set autotrace traceonly
SQL> select 'y' from dual;
Execution Plan
----------------------------------------------------------
0 SELECT STATEMENT Optimizer=CHOOSE (Cost=2 Card=1)
1 0 TABLE ACCESS (FULL) OF 'DUAL' (Cost=2 Card=1)
Statistics
----------------------------------------------------------
0 recursive calls
4 db block gets
1 consistent gets
0 physical reads
0 redo size
361 bytes sent via SQL*Net to client
425 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
1 sorts (memory)
0 sorts (disk)
1 rows processed
SQL> /
Execution Plan
----------------------------------------------------------
0 SELECT STATEMENT Optimizer=CHOOSE (Cost=2 Card=1)
1 0 TABLE ACCESS (FULL) OF 'DUAL' (Cost=2 Card=1)
Statistics
----------------------------------------------------------
0 recursive calls
4 db block gets
1 consistent gets
0 physical reads
0 redo size
361 bytes sent via SQL*Net to client
425 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
SQL>
Thanks for your input.
John Zoltak
North American Mfg Co
4455 East 71st Street
Cleveland Ohio 44105
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