Re: Re: In defense of the ZODB

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On Sun, Oct 28, 2018 at 10:39 AM Andreas Jung <[email protected]> wrote:
...

> The ZODB is a transactional, hierarchically organized store for Python
> pickles aka object store.
>

That is incorrect.  ZODB does in fact store an object graph.  It isn't
limited, no does it depend on hierarchies in any way.

It shares with graph databases the property that graphs are very easy to
represent and use.

While it's possible to represent graphs in relational databases, it is
difficult and inefficient, compared to ZODB in my experience.

I prefer to describe ZODB as an object-oriented database and leave it at
that.


> As stated a database consists in my definition of the storage layer and a
> query layer.
>
> The ZODB is clearly a storage-only implementation without a query engine
> (besides the low-level traversal logic).
> It clearly lacks any higher level query functionality as it was
> implemented as part of the ZCatalog.
>

This is a fair point with which I disagree. (Although I do wish there was a
standardized catalog implementation independent of any application
frameworks.)

Jim

-- 
Jim Fulton
http://jimfulton.info

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<div dir=3D"ltr"><br><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Sun=
, Oct 28, 2018 at 10:39 AM Andreas Jung &lt;<a href=3D"mailto:zopyxfilter@g=
mail.com">[email protected]</a>&gt; wrote:</div><div dir=3D"ltr">...</d=
iv><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left=
:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div>The ZODB is a trans=
actional, hierarchically organized store for Python pickles aka object stor=
e.</div></div></blockquote><div><br></div><div>That is incorrect.=C2=A0 ZOD=
B does in fact store an object graph.=C2=A0 It isn&#39;t limited, no does i=
t depend on hierarchies in any way.</div><div><br></div><div>It shares with=
 graph databases the property that graphs are very easy to represent and us=
e.</div><div><br></div><div>While it&#39;s possible to represent graphs in =
relational databases, it is difficult and inefficient, compared to ZODB in =
my experience.</div><div><br></div><div>I prefer to describe ZODB as an obj=
ect-oriented database and leave it at that.</div><div>=C2=A0<br></div><bloc=
kquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #cc=
c solid;padding-left:1ex"><div dir=3D"ltr"><div>As stated a database consis=
ts in my definition of the storage layer and a query layer.<br></div><div><=
br></div><div>The ZODB is clearly a storage-only implementation without a q=
uery engine (besides the low-level traversal logic).</div><div>It clearly l=
acks any higher level query functionality as it was implemented as part of =
the ZCatalog.</div></div></blockquote><div><br></div><div>This is a fair po=
int with which I disagree. (Although I do wish there was a standardized cat=
alog implementation independent of any application frameworks.)</div><div><=
br></div><div>Jim</div><div>=C2=A0</div></div>-- <br><div dir=3D"ltr" class=
=3D"gmail_signature" data-smartmail=3D"gmail_signature">Jim Fulton<br><a hr=
ef=3D"http://jimfulton.info" target=3D"_blank">http://jimfulton.info</a><br=
></div></div>

<p></p>

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