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Home -> Community -> Mailing Lists -> Oracle-L -> Re: Counting number of rows
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>
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_at_lifetouch.com
-----Original Message-----
From: Potluri, Venu (CT Appl Suppt) [mailto:venu_potluri_at_ml.com]
Sent: Tuesday, February 17, 2004 2:28 PM
To: oracle-l_at_freelists.org
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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