On 9/25/19 8:04 AM, Rob Sargent wrote:
On Sep 25, 2019, at 8:24 AM, Krishnakant Mane <kkmane@xxxxxxxxxx
<mailto:kkmane@xxxxxxxxxx>> wrote:
On 25/09/19 7:50 PM, Adrian Klaver wrote:
On 9/25/19 12:15 AM, Krishnakant Mane wrote:
Hello all,
I have been using postgresql for an enterprise quality account's
automation and inventory management software called GNUKhata
<https://gnukhata.in>
Our team is planning to add backup and restore function in the
software.
But we don't want to dump the entire database and then restore the
same.
What we are trying to do is to copy data specific to an organization.
The challenge here is that I might copy all data (account heads,
bills, vouchers etc ) for one organization from an instance on one
machine.
I take the archive in what ever format to another machine and now
attempt to restore.
The risk here is for example if the primary key value for orgcode in
the organization table is 5, it might conflict with the data where I
am attempting it to be restored.
Same holds true for bills, invoices etc.
A certain account head with accountcode 1 might be already present
on the second machine.
I am not expecting the users to empty all data from the destination
machine before restoring a backup.
The reason is that an auditor may have many client's data and one
can't predict what primary key values are going to come from a backup.
Basically I can even say this is a copy paste instead of a pure
backup and restore.
Can any one suggest how to handle such conflicts?
Hard to say. If the data is held in common tables(bills, vouchers,
etc)then the only thing I see happening is changing the PK values to
an unused value. That could turn into a nightmare though. Not only
that you lose the connection to the original data source. If the data
can be broken out into separate tables then I could see placing them
in their own schema.
--
Regards,
Krishnakant Mane,
Project Founder and Leader,
GNUKhata <https://gnukhata.in/>
//(Opensource Accounting, Billing and Inventory Management Software)//
Hi Adrian,
Even I am thinnking to do some kind of upsert with this situation.
So to be clear the tables you are working can have records from multiple
organizations in a single table?
And I would have to set the pkey to an unassigned value when there is
conflict.
I am seeing nextval() in your future:)
I may also choose to revamp the serial by timestamps but don't know if
the target customers would like it.
I would avoid that. In my opinion timestamps are to too volatile to
serve as a PK. If you are going to change I would go with the previous
suggestion of UUID:
https://www.postgresql.org/docs/11/datatype-uuid.html
Not sure your customers would like that either.
--
Regards,
Krishnakant Mane,
Project Founder and Leader,
GNUKhata <https://gnukhata.in/>
//(Opensource Accounting, Billing and Inventory Management Software)//
It would likely be easier to rethink your backup and restore plan.
Putting each restore into its own space would be one tack.
--
Adrian Klaver
adrian.klaver@xxxxxxxxxxx
