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by: Ken |
last post by:
Dear all,
I have a beginner of oracle and recently I have a prob with using
indexes. I have a table with 5 columns, with no primary key set in the
table. An index has created for column 1. I have a sql which retrieve
rows based on the indexed column:
select *
from my_table
where
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by: Adam |
last post by:
In my MYISAM table I have an index (Index_A) on 2 fields (Field_A,
Field_B). There are millions of rows in the table. The cardinality of
Index_A is 53. I think a query to count the number of rows that match
a pair of values for Field_A and Field_B should execute blindingly fast
(in the index count the number of leaf nodes for the B-Tree node...
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by: Angus Comber |
last post by:
Hello
I want to create a lookup table where I can store string keys:
For example:
192.168.0.1 -> Purple
192.168.0.2 -> Blue
192.168.0.3 -> Red
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by: Pavel Stehule |
last post by:
Hello,
Pg make query 1. and 2. very fast (use index), but for query 3. dont use
index. I can solve its using select union, but I readed so pg 7.5 don't
problem with OR operator. I use cvs pg. I used vacuum analyze first.
table sp_op_product has 15K rows, sp_op_uct 37K rows;
regards
Pavel Stehule
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by: ruben |
last post by:
Hi:
I'm running a large database on PostgreSQL 7.1.3. 20 days ago the
database failed with a threatening and not too descriptive error like:
pg_exec() query failed: server closed the connection unexpectedlyThis
probably means the server terminated abnormally before or while
processing the request.
I lost some data and had to...
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by: bobby_b_ |
last post by:
I have a table where fields 1 and 2 make up the primary key.
Because of this, I have a unique composite index on fields 1 and 2 (as
required by DB2). Now my question is: Fields 1 and 2 are also
separate foreign keys to two other tables. I have read that it is
always a good idea to create indexes on foreign keys. Should I create
single...
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by: GCM |
last post by:
Hi,
I have a table that has the following fields; LName, FName and MName. Also
there are other fields in the table. I need to create another table with
those fields combined as "Trim( & " " & & " " & ). How
can I create this table?
Thanks in advance...
GCM
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by: Yi Xing |
last post by:
Hi,
I need to read specific lines of huge text files. Each time, I know
exactly which line(s) I want to read. readlines() or readline() in a
loop is just too slow. Since different lines have different size, I
cannot use seek(). So I am thinking of building an index for the file
for fast access. Can anybody give me some tips on how to do...
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by: shira |
last post by:
I have done a fair bit of searching, but haven't yet been able to find
an explanation as to why one would set "ignore nulls" to "yes" when
creating an index. I understand what it does (I think), but I'm
looking to understand what scenario might prompt either setting (yes
or no). Any clarity you can provide is much appreciated! Thanks kindly.
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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...
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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...
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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...
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by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then...
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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...
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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...
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by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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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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by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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