Re: what is the data dictionary?

From: Martin Berger <martin.a.berger_at_gmail.com>
Date: Wed, 23 Sep 2009 21:44:42 +0200
Message-ID: <cd8f74560909231244l654c78b5o5ce7c2d9ec6a8d38_at_mail.gmail.com>

Michael, thank you for the hint! it's something to start. And you are right, I'm currently comparing european to african swallows:

here are the differences:

• what swallows do we have: select owner, object_type from dba_objects where object_name='DICTIONARY';

OWNER                          OBJECT_TYPE
------------------------------ -------------------
SYS                            VIEW
PUBLIC                         SYNONYM

• how does it look like: select text from dba_views where view_name='DICTIONARY';

TEXT

---

select o.name, c.comment$
from sys.obj$ o, sys.com$ c
where o.obj# = c.obj#(+)

• the speed of one swallow

  select count(*) --o.name, c.comment$
  from sys.obj$ o, sys.com$ c
  where o.obj# = c.obj#(+);

COUNT(*)--O.NAME,C.COMMENT$

---

                      66902

• the other swallow

select count(*) from sys.dictionary;

  COUNT(*)

---

      1881

now the question is: which one is the blue one? (I'm checking execution plans right now, and they are slightly different)

welcome to the ornithology ;-)
 Martin

On Wed, Sep 23, 2009 at 21:19, Michael McMullen <ganstadba_at_hotmail.com> wrote:
>
> That Ada Lovelace quote was pretty funny.
>
> How about "select * from dictionary" to list the tables/views or "select *
> from dict"
>
> But isn’t this question like asking "What is the Airspeed Velocity of an
> Unladen Swallow"
>
>
> -----Original Message-----
> From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org]
> On Behalf Of Martin Berger
> Sent: Wednesday, September 23, 2009 3:10 PM
> To: Goulet, Richard
> Cc: ORACLE-L
> Subject: Re: what is the data dictionary?
>
> Hi Dick,
>
> thank you for this more useful answer.
> I checked also the other emails and will summarise them:
>
> Some others just call the Data Dictionary "metadata", but nothing more
> specific.
>
> I also get the info it's bad habit to put objects into sys schema.
>
> Your hint to sql.bsq is the most useable until now. As you call the
> objects created there "basic data dictionary" - is there an "extended
> data dictionary"?
>
> There are also some dinosaurs (most of them might have discussed
> methods with Ada Lovelace) chatting in this thread.
>
> Unfortunately, noone can tell me how to decide for sure if an object
> (let's say by object_id) is part of the data dictionary or not. (not
> to mention the data dictionary cache)
>
> Martin
>
>
>
> --
> http://www.freelists.org/webpage/oracle-l
>
>
>

-- 
Martin Berger           martin.a.berger_at_gmail.com
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Received on Wed Sep 23 2009 - 14:44:42 CDT