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by: Bas Scheffers |
last post by:
Hi,
I have a table with about 100K rows, on which I have created a btree index
of the type table_name(int, int, int, timestamp).
At first postgres was using it for my AND query on all four columns, but
after dropping it and creating different ones and testing, it suddenly
stopped using it. Vaccuuming, reindexing, recreating the table and even
recreating the database all didn't help.
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by: shsandeep |
last post by:
I have added primary key to my table using the 'ALTER TABLE' statement.
Now, is it mandatory for me to use the 'CREATE UNIQUE INDEX' on primary
key columns in order to enforce the primary key constraint?
I have a vague idea that unique indexes are automatically created when we
specify the primary key constraint.
Can somebody please confirm this?
Cheers,
San.
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by: reachsamdurai |
last post by:
Hello, I'm looking for a method to check the utilization of index by
any SQL (Static and Dynamic) at the database level instead of
generating the access plan for each SQL.
I have inherited a database where index occupies more space than the
data and most of the indexes are looking redundant to me hence I would
like to check each index utilization and drop the same if it is not
used.
Env: DB2 UDB 8.2 /AIX 5.3
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by: natG |
last post by:
On a 3 column table, the PK consists of all 3 columns.
I have queries on the first two columns, as well as on the last two
columns. (Select * where column3=x and column2=y.)
I was hoping that this same pk index will suffice for the latter
(reverse-scan is on), but its doing a table scan.
Have I misinterpreted what a reverse-scan is?
Please advise. Thanks.
nat
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by: p175 |
last post by:
What are the advantages / disadvantages of having primary keys in lieu
of ordinary indexes ? If there are no foreign relationships defined, is
it better to have a two column index allowing reverse scans or primary
key ? Any performance or other benefits / issues ?
Many thanks.
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by: chrisg |
last post by:
Hi All,
I've been struggeling with this for a while now, and I was
wondering if anyone could help me.
given:
drop table GENCMP.SCRIPTS;
--==============================================================
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by: Hemant Shah |
last post by:
Folks,
I am having problem with an application that uses static SQL,
the application basically browses through the table given start and
end key most of the time it is processed from begining to end.
The db2expln tells me that there is no Data or Index prefetch.
I am running DB2 UDB 8 on AIX 5.3, and I am using DMS tablespace on
raw logical volumes on a SAN.
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by: crazy_jutt |
last post by:
hi all,
i heard that db2 ignores indexes when using any column function on the
column which has index on it. but i have seen db2 using indexes even
when using column function.
what is the criteria of db2 about picking index or not picking index
when there is a column function ?
i am using function on one column like below
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by: BD |
last post by:
Hey, all.
Subject line says it all.
But for background:
I'm developing on UDB for Windows. The production application is on z/
OS.
I'm using some Quest tools (SQL Optimizer) to review some queries, and
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by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
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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...
|
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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,...
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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...
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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...
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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();...
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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...
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by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
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