On 29/02/16 15:42, Gary Smith wrote:
On 29/02/2016 15:30, lejeczek wrote:
On 28/02/16 20:50, lejeczek wrote:
fellow users, hopefully you experts too, could help...
...me to understand how, and what should be the best
practice to dump database, then drop it and merge the
dumps..
What I'd like to do is something probably many have done
and I wonder how it's done best.
A box will be dumping a database (maybe? tables if it's
better) then dropping (purging the data) it and on a
different system that dump swill be inserted/aggregated
into the same database.
It reminds me a kind of incremental backup except for
the fact that source data will be dropped/purged on
regular basis, but before a drop, a dump which later
will be used to sort of reconstruct that same database.
How do you recommend to do it? I'm guessing trickiest
bit might this reconstruction part, how to merge dumps
safely, naturally while maintaining consistency &
integrity?
Actual syntax, as usually any code examples are, would
be best.
many thanks.
I guess dropping a tables is not really what I should
even consider - should I just be deleting everything from
tables in order to remove data?
And if I was to use dumps of such a database (where data
was first cleansed then some data was collected) to merge
data again would it work and merge that newly collected
data with what's already in the database
This sounds like a remarkably reliable way to ensure no
data integrity. What exactly are you trying to achieve?
Would replication be the magic word you're after?
I realize this all might look rather like a bird fiddling
with a worm instead of lion going for quick kill. I
replicate wherever I need and can, here a have very little
control over one end.
On that end with little control there is one simple
database, which data I'll need to be removed on regular
basis, before removing I'll be dumping and I need to use
those dumps to add, merge, aggregate data to a database on
the other end, like:
today both databases are mirrored/identical
tonight awkward end will dump then remove all the data, then
collect some and again, dump then remove
and these dumps should reconstruct the database on the other
box.
Pointers on what to pay the attention to, how to test for
consistency & integrity, would be of great help.
Gary
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