Re: Counting number of rows
- From: "Juan Cachito Reyes Pacheco" <jreyes@xxxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 17 Feb 2004 17:10:52 -0400
What do you think about this?
SQL> select /*+ FIRST_ROWS(1) */ cts_cuenta from adm.cuentas_me where
rownum=1;
Execution Plan
----------------------------------------------------------
0 SELECT STATEMENT Optimizer=HINT: FIRST_ROWS (Cost=2 Card=1 B
ytes=11)
1 0 COUNT (STOPKEY)
2 1 INDEX (FULL SCAN) OF 'CST_CTS_CUENTA' (UNIQUE) (Cost=2 C
ard=1 Bytes=11)
Statistics
----------------------------------------------------------
70 recursive calls
0 db block gets
22 consistent gets
0 physical reads
0 redo size
252 bytes sent via SQL*Net to client
417 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
SQL> select count(*) from adm.cuentas_me;
Execution Plan
----------------------------------------------------------
0 SELECT STATEMENT Optimizer=CHOOSE (Cost=2 Card=1)
1 0 SORT (AGGREGATE)
2 1 INDEX (FULL SCAN) OF 'IDX_CTS_CONTROL_PAGOS' (NON-UNIQUE
) (Cost=19 Card=16427)
Statistics
----------------------------------------------------------
0 recursive calls
0 db block gets
31 consistent gets
0 physical reads
0 redo size
248 bytes sent via SQL*Net to client
417 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
SQL>
----- Original Message -----
From: "DENNIS WILLIAMS" <DWILLIAMS@xxxxxxxxxxxxx>
To: <oracle-l@xxxxxxxxxxxxx>
Sent: Tuesday, February 17, 2004 4:44 PM
Subject: RE: Counting number of rows
Venu
Do you have any indexes on this table with NOT NULL? Count(*) will use
index if there is a not-null index or a bitmapped index (nulls are
incorporated in the bitmapped index).
Dennis Williams
DBA
Lifetouch, Inc.
dwilliams@xxxxxxxxxxxxx
-----Original Message-----
From: Potluri, Venu (CT Appl Suppt) [mailto:venu_potluri@xxxxxx]
Sent: Tuesday, February 17, 2004 2:28 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: Counting number of rows
Is there a quick way to count number of rows in a table? Don't want to do
select count(*) from..... on a table (such as GL_BALANCES) with more than
250 million rows.
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