Re: Postgres table contents versioning

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Re: Postgres table contents versioning

От:
"A. Kretschmer" <andreas.kretschmer@schollglas.com>
Дата:
In response to John Gage :
> Is there an equivalent of svn/git etc. for the data in a database's  
> tables?
> 
> Can I set something up so that I can see what was in the table two  
> days/months etc. ago?

You can use tablelog:

15:53 < akretschmer> ??tablelog
15:53 < pg_docbot_adz> For information about 'tablelog' see:
15:53 < pg_docbot_adz> http://andreas.scherbaum.la/blog/archives/100-Log-Table-Changes-in-PostgreSQL-with-tablelog.html
15:53 < pg_docbot_adz> http://pgfoundry.org/projects/emaj/
15:53 < pg_docbot_adz> http://pgfoundry.org/projects/tablelog/

-- 
Andreas Kretschmer
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GnuPG: 0x31720C99, 1006 CCB4 A326 1D42 6431  2EB0 389D 1DC2 3172 0C99

Postgres table contents versioning

От:
John Gage <jsmgage@numericable.fr>
Дата:
Is there an equivalent of svn/git etc. for the data in a database's  
tables?

Can I set something up so that I can see what was in the table two  
days/months etc. ago?

I realize that in the case of rapidly changing hundred million row  
tables this presents an impossible problem.

The best kludge I can think of is copying the tables to a directory  
and git-ing the directory.

Thanks,

John

Re: Postgres table contents versioning

От:
Chris Browne <cbbrowne@acm.org>
Дата:
jsmgage@numericable.fr (John Gage) writes:
> Is there an equivalent of svn/git etc. for the data in a database's
> tables?
>
> Can I set something up so that I can see what was in the table two
> days/months etc. ago?
>
> I realize that in the case of rapidly changing hundred million row
> tables this presents an impossible problem.
>
> The best kludge I can think of is copying the tables to a directory
> and git-ing the directory.

There's a whole set of literature on the notion of temporal data.

Richard Snodgrass' book is rather good.
  

The typical approach involves adding a timestamp or two to tables to
indicate when the data is considered valid.  That's rather different
from Git :-).
-- 
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Re: Postgres table contents versioning

От:
Tim Landscheidt <tim@tim-landscheidt.de>
Дата:
John Gage  wrote:

> Is there an equivalent of svn/git etc. for the data in a
> database's tables?

> Can I set something up so that I can see what was in the
> table two days/months etc. ago?

> I realize that in the case of rapidly changing hundred
> million row tables this presents an impossible problem.

> The best kludge I can think of is copying the tables to a
> directory and git-ing the directory.

If you're looking at this from a disaster recovery point of
view, you should read up on PostgreSQL's PITR capabilities.
If you need the information in your application, you should
google for "temporal databases" on how to amend your table
structures.

Tim
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