Performance: BITMAP index vs. Non-Bitmap Index
in the explain plan of an sql-statement I have the following part:
BITMAP CONVERSION TO ROWIDS
and then a Bitmap-Index is used.
Now, I deleted the Bitmap-Option from this index and the sql-statements
are performing much better. They only need 20% of the time, when using
a Bitmaped index.
What could be the reason for this? The conversion?
Thanks for your help,
> in the explain plan of an sql-statement I have the following part:
> BITMAP CONVERSION TO ROWIDS
> and then a Bitmap-Index is used.
> Now, I...Indexed calculations
I'm having a problem that an indexed calculation field which
references a custom function is not updated when one of it's parameter
fields is changed? Anyone care to pass on a workaround or help me
figure out why this is happening?
Thanks for any help,
> Hi all,
> I'm having a problem that an indexed calculation field which
> references a custom function is not updated when one of it's parameter
> fields is changed? Anyone care to pass on a workaround or help me
> figure out why this is happening?
> Thanks for any help,
Does anyone have code that can calculate pi to an arbitrary
precision? This is purely an academic endeavour.
Actually that's a lie. This is just so that I can show others up.
On 1 Apr, 18:07, "Braedley" <mike.braed...@gmail.com> wrote:
> Does anyone have code that can calculate pi to an arbitrary
> precision? This is purely an academic endeavour.
> Actually that's a lie. This is just so that I can show others up.
I remembered that there was a Monte Carlo mehtod to do this and the
following came up after a quick search. This is probably not ver...how to calculate pi
actually im new in mathlab....i get an assignment to calculate pi from infinite series..
from the the question its probably using loop
but i dunno how to make a repetition for the formula in mathlab
display ('loop no: ')
"atiqa eiqa" <email@example.com> wrote in message <firstname.lastname@example.org>...
> actually im new in mathlab....i get an assignment to calculate pi from infinite series..
> from the the question its probably using loop
> but i dunno how to ma...pi calculation
Ok here we go. I downloaded a pre compiled version of The GNU Multiple
Precision Arithmetic Library. Now I have created a program with it,
that I think should work. I have gotten it down to one error. But being
a noob, I have no idea what it means. Here it is.
Error E2277 main2.cpp 33: Lvalue required in function picalc(int)
Here is my sourcecode.
using namespace std;
void picalc (int a)
mpf_t x, y;
unsigned long int f;
long int e...Index Performance
I have the following table with indexes
CREATE TABLE dbo.Scratch (
ItemID int IDENTITY (1, 1) NOT NULL ,
Login varchar (12) NOT NULL ,
StartDate datetime NULL ,
PayDate datetime NULL ,
LastDisconnect datetime NULL
CREATE INDEX idxPayDate ON dbo.Scratch(PayDate)
CREATE INDEX idxStartDate ON dbo.Scratch(StartDate)
The index distribution stats show a very poor average row hits (whatever
that means) for these two indexes
e.g for idxPaydate its 61160 (11.89% very poor )
and there are many nulls in the distribution steps.
Also I have many queries with conditions like (...calculate index
i have list of index
L123456M01S01.RJM L123456M01S02.RJM L123456M01S03.RJM
L123456M01S04.RJM L123456M01S05.RJM L123456M01S06.RJM
L123456M01S07.RJM L123456M01S08.RJM L123456M01S09.RJM
may i know how to use tcl to calculate how many of this index??
On Feb 16, 4:27=A0pm, muhammaddzulkarn...@gmail.com wrote:
> Hello everyone..
> i have list ofindex
> L123456M01S01.RJM L123456M01S02.RJM L123456M01S03.RJM
> L123456M01S04.RJM L123456M01S05.RJM L123456M01S06.RJM
> L123456M01S07.RJM L123456M01S08.RJM L123456M01S09.RJM
> may i know how to use tcl tocalcul...Select performance issue vs local index and global index
We do have a performance problem with a simple select running against as simple table.
The table is physically partition on a daily basis base on a date in the table. We do have 365 physical partitions (each partition contain millions of rows).
The table contain 1 year of data. We are running under db2 9.7.8.
We do have a single global index on person_no column in this table.
The select look like this : select ... from person where person_no = 3345;
Every time, we run the select with a specific person_no, we always get less than 100 records return.
When we run the selec...Oracle 8.1.7 - Performance
I have a table (Table1) with around 250 million records in Oracle 8.1.7., of which 2 columns (column1 and column2) based on values : A, B, C, D & W, X, Y, Z respectively.
Can someone please clarify my doubts :
1. I have 3 scenarios for column1. Creating a Partition alone (or) Partition-ed index (or) Non-Partitioned Index on column1 :
a. how will the data be accessed for the above 3 scenarios
b. which is better with respect to performance
2. I am planning to create a complex partition on column1 and column2, since the queries on table1 is based on column1 and column2 :