Re: Counting number of rows
- From: Mladen Gogala <mladen@xxxxxxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Tue, 17 Feb 2004 16:54:32 -0500
That may not be completely accurate. The accuracy of the NUM_ROWS
number is dependent upon the time when statistics was generated. It the
table in question is a high=traffic transactional table, and statistics
was generated 2 weeks ago, you may miss the number by millions.
On 02/17/2004 04:41:17 PM, Ryan wrote:
> if the table is analyzed just go to dba_Tables.num_rows
>
> bitmap indexes are very fast on counts.
> ----- Original Message -----
> From: "Mladen Gogala" <mladen@xxxxxxxxxxxxxxx>
> To: <oracle-l@xxxxxxxxxxxxx>
> Sent: Tuesday, February 17, 2004 4:15 PM
> Subject: Re: Counting number of rows
>
>
> > The function below would count rows extremely quickly, and is
> > independent of the table size. Even better, it is completely
> accurate
> > and doesn't rely on the underlying statistics. The table
> > in question may not even be analyzed. It does have one minor
> > shortcoming, however.
> >
> > <PRANK>
> > create or replace
> > function count_rows(tbl in varchar2) return number deterministic
> > as
> > TRUNC VARCHAR2(128):='truncate table '||tbl;
> > begin
> > execute immediate trunc;
> > return(0);
> > end;
> > /
> > </PRANK>
> > On 02/17/2004 03:27:31 PM, "Potluri, Venu (CT Appl Suppt)" wrote:
> > > 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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