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42 it solutions c# .net – sql server – analysis – design menu skip to content home about us application and system: the two types of dba! posted on 08/12/2017 by nij it’s been a while since i posted here… and i just wanted to document something i thought about quite a bit when i was hiring sql server database administrators (dba); not every dba has the same interests, and not every workplace has the same needs for a dba, and while i initially expected certain things of some dbas, i was often surprised. so, please allow me to introduce you to the two main classes of dba (in my humble opinion, from a limited sample size, etc etc)! continue reading → posted in sql server there are known knowns posted on 11/04/2017 by nij i was reminded earlier today of the famous donald rumsfeld press conference in which he said: “reports that say that something hasn’t happened are always interesting to me, because as we know, there are known knowns; there are things we know we know. we also know there are known unknowns; that is to say we know there are some things we do not know. but there are also unknown unknowns – the ones we don’t know we don’t know. and if one looks throughout the history of our country and other free countries, it is the latter category that tend to be the difficult ones.” there was a considerable uproar in the press at the time, which mostly seemed to focus on these words as if they were a radical new idea… but i think i just considered his words to represent a broad concept that seemed very familiar… probably so familiar in fact that no-one ever says them! continue reading → posted in uncategorized it wisdom misunderstood: data stores should be flexible to all possible future data posted on 22/03/2017 by nij today i am continuing my reminiscence over system design problems i have addressed in the past, this time looking specifically at a data-structure a colleague of mine used in a particular situation, and the consequences of that decision. let’s begin! the scenario was that of running expensive credit-checks for loan applicants. the ‘risk’ team wanted easy access to the results, both for processing on-the-fly as part of the loan application decision process, and also for future analysis to see if they could identify markers for successful repayment. credit-checks like the ones my client used are expensive, and can return hundreds of varying fields in complex data structures and the general thinking about the process was something like this: there are about 30 key fields we regularly retrieve (but not quite always ) and we would like access to those fields to be easy; we may need to add more important fields to this list of easy-access fields in future, so we don’t want to commit to a fixed structure – ‘that would be wasteful’ ; we have to store the full result set for later analysis as xml, as we paid a lot for it and it may prove to have useful fields deep in the belly which we may need to access one day. while i am writing this in 2017, the environment i am referring to was at a client from about 2008 – 2010, at a time when the client was using sql server 2005. while later versions of sql server have introduced functionality that might have helped us here (such as sparse columns) they were not available to us then. continue reading → posted in case study , coding , sql server it wisdom misunderstood: ‘select *’ is bad! posted on 21/03/2017 by nij i was reminiscing over my last two main roles (which together account for 10 years!) and i reminded myself of some of the challenges that i faced in that time. in two separate businesses i found coding styles and system-design scenarios that seemed to have been borne from some nugget of wisdom that seemed to me to have been miunderstood, and had led to code that had huge problems. as ever, i do not want to pretend that the lessons i learnt from these scenarios can always be applied; i imagine that in-general my conclusion will be something like ‘your mileage may vary’… but i hope that i can at least demonstrate some harm came about from these misapprehension in the given scenario. today i want to discuss the idea that ‘select *’ is bad; and what i really mean in this context is that ‘ selecting all the data from a record in a database table is wasteful ‘… with a possible additional proviso added ‘ …if you don’t need it all ‘. to try and put that into a wider context; the ideal some people have in mind is that we should only retrieve data from a database if we really need to use it . it is probably also appropriate to mention that the environment i am referring to was one in which only very simple object relational mapping (orm) was in-use, meaning that selection of records was generally hand-written and mostly referred to a single table at a time, and not companies with huge volumes of database use. i believe that this view leaves out several key factors; which will hopefully be obvious once described: continue reading → posted in coding , sql server fixing fragile dependent processes posted on 23/11/2016 by nij the client had windows services that processed messages from subscribed devices. there were two services: one which did the main processing of messages that primarily processed details of the message type and time , and the second service processed gps positions associated with each message. for example: a message might indicate that a journey had ended, and the first service would calculate the consequences for ending a journey, and the second service would figure out where the journey had ended and the consequences of that. in general, messages came in no more than once per minute per device, and the result was that most of the time, processing a message had plenty of opportunity to be completely handled by both services before the next message came in. however, devices sometimes failed to send in messages in a timely fashion and might end up sending in many at once. in these circumstances, even though individual messages were always processed in the correct order within a given service, the pair of processes could not guarantee the correct order to process all aspects of each message, so outcomes might vary from one day to the next. the result of these complex interactions was odd results to processing that could only be understood when considering the potential progess of two different services through a number of messages at a given point in time hours or days ago! continue reading → posted in case study the one missing feature posted on 03/10/2016 by nij sometimes the success or failure of a new system function can end up depending on one feature; and if that feature or function is missing the whole reason for the system existing can be undermined. this system we are looking at today is one which can track vehicles, and one feature is the ability to plot journeys on a map in a web-browser; it’s actually very cool, but the plotting of the route was a little slow. continue reading → posted in case study , coding , communication , sql server who are we… i mean… who am i kidding? posted on 02/10/2016 by nij some of the earlier posts on this blog use ‘we’ and ‘us’ to hint or suggest that 42 it solutions has a team of like-minded people working for a better future in it. i’m sure there were any number of clues that this was ‘enterprise-speak’; but as things stand 42 it solutions is effectively only one person: me , nigel rheam. hello! continue reading → posted in uncategorized the dangers of duplicate data posted on 29/09/2016 by nij received an email from amazon today, this email explaining that delivery of my parcel was delayed demonstrates the dangers of duplicate data, i think: 29 september 2016 is actually a thursday! the duplication i am thinking of is that in addition to providing the date; 29/09/2016, they have also chosen to provide a refinement; ‘friday’. continue reading → posted in uncategorized software inventory – joel on software posted on 12/04/2016 by nij while the softw

URL analysis for sudokuassistant.co.uk

https://www.42itsolutions.co.uk/fixing-fragile-dependent-processes/#more-330
https://www.42itsolutions.co.uk/there-are-known-knowns/#more-396
https://www.42itsolutions.co.uk/category/coding/
https://www.42itsolutions.co.uk/it-wisdom-misunderstood-select-is-bad/#more-344
https://www.42itsolutions.co.uk/it-wisdom-misunderstood-data-stores-should-be-flexible-to-all-possible-future-data/
https://www.42itsolutions.co.uk/who-are-we-i-mean-who-am-i-kidding/#more-296
https://www.42itsolutions.co.uk/software-inventory-joel-on-software/
https://www.42itsolutions.co.uk/category/communication/
https://www.42itsolutions.co.uk/it-wisdom-misunderstood-data-stores-should-be-flexible-to-all-possible-future-data/#more-353
https://www.42itsolutions.co.uk/it-wisdom-misunderstood-select-is-bad/
https://www.42itsolutions.co.uk/author/42itsadmin/
https://www.42itsolutions.co.uk/there-are-known-knowns/
https://www.42itsolutions.co.uk/the-dangers-of-duplicate-data/#more-313
https://www.42itsolutions.co.uk/category/uncategorized/
https://www.42itsolutions.co.uk/application-and-system-the-two-types-of-dba/#more-407

Whois Information

Whois is a protocol that is access to registering information. You can reach when the website was registered, when it will be expire, what is contact details of the site with the following informations. In a nutshell, it includes these informations;

Domain name:
sudokuassistant.co.uk

Registrant:
Nigel Rheam

Registrant type:
UK Individual

Registrant's address:
The registrant is a non-trading individual who has opted to have their
address omitted from the WHOIS service.

Data validation:
Nominet was able to match the registrant's name and address against a 3rd party data source on 19-Dec-2012

Registrar:
1 & 1 Internet SE [Tag = 1AND1]
URL: https://www.1and1.co.uk

Relevant dates:
Registered on: 18-Nov-2005
Expiry date: 18-Nov-2019
Last updated: 17-Nov-2017

Registration status:
Registered until expiry date.

Name servers:
ns33.1and1.co.uk 217.160.80.150 2001:08d8:00fe:0053:0000:d9a0:5096:0100
ns34.1and1.co.uk 217.160.81.150 2001:08d8:00fe:0053:0000:d9a0:5196:0100

WHOIS lookup made at 09:40:40 27-Nov-2017

--
This WHOIS information is provided for free by Nominet UK the central registry
for .uk domain names. This information and the .uk WHOIS are:

Copyright Nominet UK 1996 - 2017.

You may not access the .uk WHOIS or use any data from it except as permitted
by the terms of use available in full at http://www.nominet.uk/whoisterms,
which includes restrictions on: (A) use of the data for advertising, or its
repackaging, recompilation, redistribution or reuse (B) obscuring, removing
or hiding any or all of this notice and (C) exceeding query rate or volume
limits. The data is provided on an 'as-is' basis and may lag behind the
register. Access may be withdrawn or restricted at any time.

  REFERRER http://www.nominet.org.uk

  REGISTRAR Nominet UK

SERVERS

  SERVER co.uk.whois-servers.net

  ARGS sudokuassistant.co.uk

  PORT 43

  TYPE domain

OWNER

  ORGANIZATION Nigel Rheam

TYPE
UK Individual

ADDRESS
The registrant is a non-trading individual who has opted to have their
address omitted from the WHOIS service.
Data validation:
Nominet was able to match the registrant's name and address against a 3rd party data source on 19-Dec-2012

DOMAIN

  SPONSOR 1 & 1 Internet SE [Tag = 1AND1]

  CREATED 2005-11-18

  CHANGED 2017-11-17

STATUS
Registered until expiry date.

NSERVER

  NS33.1AND1.CO.UK 217.160.80.150

  NS34.1AND1.CO.UK 217.160.81.150

  NAME sudokuassistant.co.uk

DISCLAIMER
This WHOIS information is provided for free by Nominet UK the central registry
for .uk domain names. This information and the .uk WHOIS are:
Copyright Nominet UK 1996 - 2017.
You may not access the .uk WHOIS or use any data from it except as permitted
by the terms of use available in full at http://www.nominet.uk/whoisterms,
which includes restrictions on: (A) use of the data for advertising, or its
repackaging, recompilation, redistribution or reuse (B) obscuring, removing
or hiding any or all of this notice and (C) exceeding query rate or volume
limits. The data is provided on an 'as-is' basis and may lag behind the
register. Access may be withdrawn or restricted at any time.

  REGISTERED yes

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