From yzaslavs at redhat.com Sun May 12 05:53:01 2013 Content-Type: multipart/mixed; boundary="===============6557773343439921506==" MIME-Version: 1.0 From: Yair Zaslavsky To: devel at ovirt.org Subject: Re: [Engine-devel] What type of DB inheritance to use? Date: Sun, 12 May 2013 05:53:01 -0400 Message-ID: <176765088.119212.1368352381011.JavaMail.root@redhat.com> In-Reply-To: 1682384155.165721.1368351734157.JavaMail.root@redhat.com --===============6557773343439921506== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable ------=3D_Part_119211_1477841530.1368352381010 Content-Type: text/plain; charset=3Dutf-8 Content-Transfer-Encoding: 7bit ----- Original Message ----- > From: "Mike Kolesnik" > To: "engine-devel" > Sent: Sunday, May 12, 2013 12:42:14 PM > Subject: [Engine-devel] What type of DB inheritance to use? > Hi All, > I would like to have your opinions on which inheritance type to use in the > DB. > We are adding an "external provider" entity to the system which will be a= ble > to provide various resources (networks, hosts, etc). > These providers will be distinguishable by "type". > The basic definition of a provider contains: > * name > * description > * url > * type > Some providers might need additional properties such as: > * user > * password > In Java this is easily represented by inheritance. > In the DB however, there are 3 approaches that we can take: > 1. No inheritance. This means that each type will wit in his own table, w= ith > no relation or re-use. > 2. Single table inheritance. All types sit in a single table, and each has > his corresponding columns. You forgot to mention discriminator column at option 2 (how are you going t= o differ between sub types) which should be indexed. = > 1. > 2. Multiple table inheritance. Each type sists in his own table, where th= e PK > is FK for the most basic table (providers). > Pros for each approach: > 1. None that I can think of. > 2. No joins: Better performance Easier for developer to see the DB info > Facilitate column reuse > 3. Constraints can be set on each column > Cons for each approach: > 1. No reuse of DB entities + no compliance for column types Most cumberso= me > to query all providers > 2. Can't put some constraints on non-base columns (esp. not null) > 3. Joins are needed - opposite of the pros of 2 > 1. > From personal experience, I find #2 to be better and easier to work with & > maintain. I think it really depends on the use-case, but I also had better experience= with 2. = > What are your thoughts? > Regards, > Mike > _______________________________________________ > Engine-devel mailing list > Engine-devel(a)ovirt.org > http://lists.ovirt.org/mailman/listinfo/engine-devel ------=3D_Part_119211_1477841530.1368352381010 Content-Type: text/html; charset=3Dutf-8 Content-Transfer-Encoding: quoted-printable

<=3D blockquote style=3D3D"border-left:2px solid #1010FF;margin-left:5px;padding= -l=3D eft:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:non= =3D e;font-family:Helvetica,Arial,sans-serif;font-size:12pt;">From: "Mik= =3D e Kolesnik" <mkolesni(a)redhat.com>
To: "engine-devel" <= en=3D gine-devel(a)ovirt.org>
Sent: Sunday, May 12, 2013 12:42:14 PM= Subject: [Engine-devel] What type of DB inheritance to use?

Hi All,

= =3D

I would like to have your opinions on which inheritance type to use in= =3D the DB.

We are adding an "external provider" entity to the s= =3D ystem which will be able to provide various resources (networks, hosts, etc= =3D ).

These providers will be distinguishable by = =3D "type".

The basic definition of a provider contains:

name
description
url
type

= =3D Some providers might need additional properties such as:

user
password

In Java this is easily repr= =3D esented by inheritance.

In the DB however, the= =3D re are 3 approaches that we can take:

No inheritance.= =3D
This means that each type will wit in his own table, with no relation o= =3D r re-use.
Single table inheritance.
All types sit in a singl= =3D e table, and each has his corresponding columns.

You forgot to mention discriminator column a= =3D t option 2 (how are you going to differ between sub types) which should be = =3D indexed.

Multiple table = =3D inheritance.
Each type sists in his own table, where the PK is FK for th= =3D e most basic table (providers).

Pros for e= =3D ach approach:
None that I can think of.
N= =3D o joins:
    Better performance
   = =3D ; Easier for developer to see the DB info
    F= =3D acilitate column reuse
Constraints can be set on each column
Cons for each approach:
No reuse of DB entities + no compliance for column types
Most= =3D cumbersome to query all providers
Can't put some constraints o= =3D n non-base columns (esp. not null)
Joins are needed - opposite = =3D of the pros of 2

<= =3D br>
From personal experience, I find #2 to be better and easi= =3D er to work with & maintain.

I think = =3D it really depends on the use-case, but I also had better experience with 2.= =3D

What are your thoug= =3D hts?

Regards,
Mike

= =3D

_______________________________________________
Engine-d= =3D evel mailing list
Engine-devel(a)ovirt.org
http://lists.ovirt.org/mai= lm=3D an/listinfo/engine-devel

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