[support] Doubt on Index and Primary key

[Austin Einter]

Hi Pat
Thanks for detail help. I really appreciate it. I did put the tables in
excel sheet. It looks fine.

But the only worry is skillset table row count.

Assuming on average, one person has 10 different skills, then skillset table
will have 10 entries per user.
Assuming total 50,000,00 users (May be a higher number , but I want to
design keeping this number high), then total number of rows in skillset
table will be 50,000,00 x 10 = 50,000,000 which is really high. Is this
going to be a bottle neck from MySql perspective, search time perspective??

I am attaching the excel sheet (please where I have put the tables as per
suggestion), please have a look.

Best Regards
Austin

On Fri, Mar 25, 2011 at 2:27 PM, Pat Johnston <Pat at melrosecenter.com> wrote:

> Austin,
>
> I think you're off to a good start. I might suggest that you do something
> about all of those skill-set tables. You could replace them with three
> tables and still have the information in easy reach:
>
> - A skillGroup table with
> -- sgID - an integer primary key
> -- name - name of the group, like 'Web Skills', 'Database'
>
> - A skills table with
> -- sID - an integer primary key
> -- sgID - ID of the skillGroup that the skill belongs to
> -- skill - the name of the skill, like 'PHP' or 'PostgreSql'
>
> - A skillset table with
> -- UID - your user ID
> -- sID - ID of the skill being rated
> -- skillRating - 0 or 1 or whatever
>
> The skillset entry links to the skill via the sID and to the user table
> (Table 1) with the UID. The skill table is then linked to the skillGroup via
> the sgID. This way you can add skill groups and skills as need without
> needing to create more tables.
>
> Good Luck,
>
> Pat
>
>
> On 3/24/2011 6:58 PM, Austin Einter wrote:
>
> Hi Pierre, David, Ursula
> Thanks for excellent piece of information. I just went through basic
> database concepts like indexing, join, normalisation and tried to analyse
> how can I apply these for my job registration site implementation.
>
> After understanding a bit on normalisation and join, I have comeup with
> below approach for this specific case.
>
> Instead of having a single table, and comma separated values in table cells
> , I am going to split it multiple tables.
> I am attaching a table.xls file , please have a look.
>
> In that excel sheet, I have the main table, and I have broken the main
> table into 9 different tables. But I hope it need to be broken into more
> number of tables, depends on how many  different kind of work domains are
> there. It may go to 50+ tables.
>
> Examples for work domains are - Web, PSTN, VoIP, NetworkManagement, GSM,
> Datbase, BoardDesign etc.
>
> So how many work domains are there, those many tables will be there. In
> those tables, a coulmn will represent a particular skill set.
>
> Say under Web Tables, coulmns can be HTML, PHP, Web2.0, Drupal, ASP, etc
> And under NetworkManagement table, NMS and SNMP can be coulmns.
>
> In table cells, I will keep either 1 or 0, depending on the person has that
> skill or not.
>
>
>  Example: Lets say User 2 knows NMS and SNMP, User 3 knows only SNMP, User4
> knows only SNMP, then the table will look as below.
>
>     *UID* NMS SNMP 2 1 1 3 0 1 4 0 1
>
>
> As first time I am  doing this, I might be wrong. If so, kindly let me
> know.
>
> Best Regards
> Austin.
>
>
>
>
>
>
> On Fri, Mar 18, 2011 at 8:54 PM, Pierre Rineau <
> pierre.rineau at makina-corpus.com> wrote:
>
>> Le vendredi 18 mars 2011 à 08:15 -0700, Metzler, David a écrit :
>> > Pierre is spot on here.
>> >
>> > That is why most dbas would advise against storing this data in a comma
>> separated list in a single field.  An index cannot really be used to search
>> within the text cause you are forcing to examine every row anyway.  I can't
>> programtically say lets start with the N's, now is there a nokia in there
>> (that's an oversimplification intentionally to make a point). Rather I would
>> make a single skill table that housed the values. If UID is the primary key
>> for the resume, then you'd make a table with
>> >
>> > On a separate note, you do understand that the site that you're talking
>> about building could be done without you writing ANY code? Basically the
>> site you've described can be implemented with content_profile, cck and views
>> modules, allowing you to build custom content types that are tied (one per
>> user).  You could then use taxonomys for skill sets an all this would be
>> written for you?
>> >
>> > Dave
>>
>> Dave is right about the fact this simple business stuff could be done in
>> many ways using D6 existing modules (even only with core and taxonomy)
>> or D7 fields.
>>
>> But, if you really want to learn technical aspects of SQL and/or Drupal
>> development, this is a good thing to start with this kind of simple
>> business stuff.
>>
>> Pierre.
>>
>>
>> --
>> [ Drupal support list | http://lists.drupal.org/ ]
>>
>
>
>
> --
> [ Drupal support list | http://lists.drupal.org/ ]
>
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