On 20 January 2011 19:20, Dotan Cohen dotanco...@gmail.com wrote:
On Thu, Jan 20, 2011 at 19:21, Richard Quadling rquadl...@gmail.com wrote:
That is terrific, at least the first half. The second half, with the
Venn diagrams, is awkward!
When you get heavily nested data, the adjacent list
Actually, I'm the customer! But assuming that a customer exists, that
implies compensation, and therefore fair bait.
Then that's different altogether. you get to decide what information
is displayed, and what information is 'sensed', and on what platform.
Yes, but before I get to that stage
If you are doing this often, you could leave spaces in the left and right
values so that you could minimize the number of rows that need to be
updated. The article makes every leaf use x and x+1 for left and right which
forces another update to add a child. If instead you used x and x+20 you'd
Yes, and an edge list model may perform better in other respects too:
http://www.artfulsoftware.com/mysqlbook/sampler/mysqled1ch20.html
http://www.artfulsoftware.com/mysqlbook/sampler/mysqled1ch20.html
Thanks. I am currently reading Trees and Hierarchies in SQL for
Smarties by Joe Celko,
On Fri, Jan 21, 2011 at 12:29, Richard Quadling rquadl...@gmail.com wrote:
Changing data in a database is the role of the database engine. It is
much more efficient to have the cost on the insert than it is on the
select.
Agreed. On insert I could even delegate the operation to another
thread
-Original Message-
From: vegiv...@gmail.com [mailto:vegiv...@gmail.com] On Behalf Of Johan De
Meersman
Sent: Friday, January 21, 2011 1:22 AM
To: Anthony Pace
Cc: Michael Dykman; mysql.
Subject: Re: best way to have a unique key
I have to say, something similar was my first thought, too -
Thanks for the suggestions everybody.
I added in columns to store the day, month and year of the created_at value,
and then added in an index on (newsletter_id, created_month, created_day),
and the the slow queries reduced from around 20 seconds to 0.5 seconds! I
also removed the redundant
One of the components of the UUID is drawn form the mac address of the
server.. While in practice this is not true of all systems
(except from
http://dev.mysql.com/doc/refman/5.0/en/miscellaneous-functions.html#function_uuid)
Currently, the MAC address of an interface is taken into
Here it is in a nutshell:
I have a field that needs to be set equal to the auto-increment ID as a record
is entered. I don’t know how to do this without a subsequent UPDATE (which I
can do with a trigger). Is there any way to avoid the cost of an UPDATE?
Here’s a more concrete
-Original Message-
From: Michael Dykman [mailto:mdyk...@gmail.com]
Sent: Friday, January 21, 2011 11:35 AM
To: Johan De Meersman
Cc: Anthony Pace; mysql.
Subject: Re: best way to have a unique key
One of the components of the UUID is drawn form the mac address of the
server.. While in
I think an ON INSERT TRIGGER would take care of this; can't think of
any other way. Using last_insert_id() in the argument list would
likely yield you the previous value (which might not even related to
your table.
Having siad that.. odd requirement.
- michael dykman
ps -- sorry for the
-Original Message-
From: Michael Dykman [mailto:mdyk...@gmail.com]
Sent: Friday, January 21, 2011 11:50 AM
To: MySql
Subject: Re: CURRENT insert ID
I think an ON INSERT TRIGGER would take care of this; can't think of
any other way. Using last_insert_id() in the argument list would
likely
-Original Message-
From: Jerry Schwartz [mailto:je...@gii.co.jp]
Sent: Friday, January 21, 2011 11:56 AM
To: 'Michael Dykman'; 'MySql'
Subject: RE: CURRENT insert ID
-Original Message-
From: Michael Dykman [mailto:mdyk...@gmail.com]
Sent: Friday, January 21, 2011 11:50 AM
To:
I made a typo in my previous message.
-Original Message-
From: Jerry Schwartz [mailto:je...@gii.co.jp]
Sent: Friday, January 21, 2011 12:20 PM
To: 'Jerry Schwartz'; 'Michael Dykman'; 'MySql'
Subject: RE: CURRENT insert ID
-Original Message-
From: Jerry Schwartz
I can´t think about how useful for you would be to have two fields with the
same value.
--
João Cândido de Souza Neto
Jerry Schwartz je...@gii.co.jp escreveu na mensagem
news:007501cbb98a$177acba0$467062e0$@co.jp...
Here it is in a nutshell:
I have a field that needs to be set equal to the
@Joao - I'm currently building a database out right now that has this
scenario. One field can be the primary key, that has a purpose for holding
the record id, another field can hold the value. Let say there are two
fields, id, s_id. Initially, you insert a record and `id` is now 100 and you
Ok, you must have your own reasons to do that.
The fact is: You can´t set the auto_incremente value field to another field
in the same table and record even in a trigger.
So, the best way is a second update.
--
João Cândido de Souza Neto
Darryle Steplight dstepli...@gmail.com escreveu na
On Fri, Jan 21, 2011 at 4:44 AM, Dotan Cohen dotanco...@gmail.com wrote:
Then I would have to check what values are available when inserting,
and possibly normalise every so often. I'll think about that, and when
I have enough data in the database I'll set up a test system to play
with the
On Friday, January 21, 2011 09:23:47 am Jerry Schwartz wrote:
[JS] A UUID (what Microsoft calls a GUID) is based in part on the MAC
address of the generating device. Since MAC addresses are supposed to be
unique across the known universe, so should a UUID.
Not entirely true - and even
You don't need to do an update:
...
new.xxx = new.id
...
On Fri, Jan 21, 2011 at 12:20 PM, Jerry Schwartz je...@gii.co.jp wrote:
-Original Message-
From: Jerry Schwartz [mailto:je...@gii.co.jp]
Sent: Friday, January 21, 2011 11:56 AM
To: 'Michael Dykman'; 'MySql'
Subject: RE: CURRENT
Hello everyone, I've got a database on an old Fedora Core 4 server running
MySQL 4 (mysql-server.x86_64 4.1.12-2.FC4.1). The database in question has
just two (InnoDB) tables:
messages (approx 2.5 million records)
recipients (approx 6.5 million records)
These track information about email
I have a table which contains a username column which may be constructed
something like
somename[A] or [DDD]someothername
The A or DDD can be anything at all.
I've added a new column to the table to which I'd like to populate with the
value within the square brackets.
I
you need hughe ram / innodb_buffer_pool for large datasets
in a perfect world the buffer_pool is as large as the data
how looks your current config?
how much RAM has the machine?
Am 21.01.2011 20:21, schrieb Kendall Gifford:
Hello everyone, I've got a database on an old Fedora Core 4 server
-Original Message-
From: João Cândido de Souza Neto [mailto:j...@consultorweb.cnt.br]
Sent: Friday, January 21, 2011 12:47 PM
To: mysql@lists.mysql.com
Subject: Re: CURRENT insert ID
Ok, you must have your own reasons to do that.
The fact is: You can´t set the auto_incremente value field
-Original Message-
From: Michael Dykman [mailto:mdyk...@gmail.com]
Sent: Friday, January 21, 2011 1:27 PM
To: Jerry Schwartz
Cc: MySql
Subject: Re: CURRENT insert ID
You don't need to do an update:
...
new.xxx = new.id
...
[JS] I wish it were that easy. new.id is null until after the
On 1/21/2011 14:21, Kendall Gifford wrote:
Hello everyone, I've got a database on an old Fedora Core 4 server running
MySQL 4 (mysql-server.x86_64 4.1.12-2.FC4.1). The database in question has
just two (InnoDB) tables:
messages (approx 2.5 million records)
recipients (approx 6.5 million
On Fri, Jan 21, 2011 at 2:01 PM, Shawn Green (MySQL)
shawn.l.gr...@oracle.com wrote:
On 1/21/2011 14:21, Kendall Gifford wrote:
Hello everyone, I've got a database on an old Fedora Core 4 server running
MySQL 4 (mysql-server.x86_64 4.1.12-2.FC4.1). The database in question has
just two
Just an idear..
Don't auto_increment the main table.. create a unique Id table,
auto_increment that, and grab that value first for use with both fields
in your main table.
Donovan
--
D Brooke
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Hi,
On 22/01/2011, at 11:27 AM, Donovan Brooke wrote:
Just an idear..
Don't auto_increment the main table.. create a unique Id table,
auto_increment that, and grab that value first for use with both fields in
your main table.
This can be wrapped into a trigger, so the main table
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