| |
by: Kamil |
last post by:
Hello
What should I use for better perfomance since
unique constraint always use index ?
Thanks
Kamil
|
by: Gregory.Spencer |
last post by:
Hi there,
Using PHPMyAdmin and it is very usefully reporting problems with my
MySQL DB.
"PRIMARY and INDEX keys should not both be set for column
`column_name`"
and
|
by: Johann Uhrmann |
last post by:
Hello,
are there any experiences about the performance of indices
with different data types.
How do the performance of an index that consists of
- an integer field
- a varchar() field
- a text field
|
by: Andr? Queiroz |
last post by:
Hi,
I have a table with 10M records and col A has a index created on it.
The data on that table has the same value for col A on all 10M
records. After that I insert diferent values for that column but my
queries do not use the index I created for that column.
Is there any way I can force the usage of the index or to ommit a
value on the index creation, like 0 (zeroes) or spaces?
Thanks in advance,
André Queiroz
|
by: WalterR |
last post by:
This is my first time here, so there may be earlier relevant threads of
which I am unaware. Though my experience with DB2 is not extensive,
such as it is was under OS/390 or equ. My main experience is IMS DB,
which leads to my question.
In IMS, there is an HDAM access method which can find a record without
using an index as such. At initial database load, it first formats the
entire space allocation into blocks of the given size. ...
|
| |
by: Sam |
last post by:
Hi,
Here is my code :
For Each row As DataRow In ds.Tables(0).Rows
next
How can I get the index of the row being processed ?
Thx
|
by: bernhard.willems |
last post by:
We are using DB2 UDB version 8.1 fp7 & fp9 on AIX 5.2.
On our databases we do massive inserts and deletes (millions of rows).
The performance is dramatically reduced because of pseudo deleted keys.
In a 10 minutes it goes from 18000 transaction per minute to 9000 and
lower.
When an index reorg with CLEANUP ONLY PAGES is executed, the number of
transactions climbs again. But a few minutes later it drops again to
9000.
We have to run the...
|
by: ep4169 |
last post by:
I have to regularly import records into a table in the database that also contains records that were created internally. Those that are imported have an ImportRecordID column that I use to ensure that I don't import a record twice. In the import code, I query the table on the ImportRecordID column, and if I get no results, I go ahead and add the new record. Very straightforward.
The problem is that I noticed that when I removed this "existing...
|
by: Henry J. |
last post by:
I have a composite index on two columns in a table. However, the
index is not used in a query that restricts the 2nd column to a
constant. If both columns are linked with columns in other join
tables, the index will be used.
To illustrate it with an example, I have a query like this:
select s.ticker, p.quantity
from stock s, positions p
where s.type_id = 4
|
by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
|
by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
|
| |
by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
|
by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
|
by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
|
by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
|
by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
|
by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
|
| |
by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
|
2
