Data warehousing question/best practices

I have been given the task of copying a few tables from our production database to a data warehousing database on a once-a-day (overnight) basis. The number of tables will grow over time; currently it is 10. I am interested in not only task success but also best practices. Here's what I've come up with:
1) drop the table in the destination database.
2) re-create the destination table from the script provided by SQL Developer when you click on the 'SQL' tab while you're viewing the table.
3) INSERT INTO the destination table from the source table using a database link. Note: I am not aware of any columns in the tables themselves which could be used to filter added/deleted/modified rows only.
4) After data import, create primary key and indexes.
Questions:
1) SQL Developer included the following lines when generating the table creation script:
<table creation DDL commands>
then
PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
STORAGE (INITIAL 251658240 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
TABLESPACE "TBLSPC_PGROW"
it generated this code snippet for the table, the primary key and every index.
Is this necessary to include in my code if they are all default values? For example, one of the indexes gets scripted as follows:
CREATE INDEX "XYZ"."PATIENT_INDEX" ON "XYZ"."PATIENT" ("Patient")
-- do I need the following four lines?
PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS
STORAGE(INITIAL 60817408 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
TABLESPACE "TBLSPC_IGROW"
2) Anyone with advice on best practices for warehousing data like this, I am very willing to learn from your experience.
Thanks in advance,
Carl

I would strongly suggest not dropping and recreating tables every day.
The simplest option would be to create a materialized view on the destination database that queries the source database and to do a nightly refresh of that materialized view. You could then create a materialized view log on the source table and then do an incremental refresh of the materialized view.
You can schedule the refresh of the materialized view either in the materialized view definition, as a separate job, or by creating a refresh group and adding one or more materialized views.
Justin

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Regards-
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Hi K,
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I have built my client an application that analyzes uploaded
zip codes for
matches with a standard set of zips. These uploaded zips can
be one at a
time, or a copy/paste from an XLS file (just 5 digit ZIPs).
They are now asking me to save these uploaded zips, and I am
wondering what
would be the best way to do that. My two obvious choices are
1. Write them to an external text file with a
programmatically generated
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I'm inclined to the former, since I don't think there would
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Murray --- ICQ 71997575
Adobe Community Expert
(If you *MUST* email me, don't LAUGH when you do so!)
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http://www.dwfaq.com - DW FAQs,
Tutorials & Resources
==================

Dang - sorry. Wrong forum.
Murray --- ICQ 71997575
Adobe Community Expert
(If you *MUST* email me, don't LAUGH when you do so!)
==================
http://www.projectseven.com/go
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http://www.dwfaq.com - DW FAQs,
Tutorials & Resources
==================
"Murray *ACE*" <[email protected]> wrote
in message
news:fvfi5j$ig7$[email protected]..
>I have built my client an application that analyzes
uploaded zip codes for
>matches with a standard set of zips. These uploaded zips
can be one at a
>time, or a copy/paste from an XLS file (just 5 digit
ZIPs).
>
> They are now asking me to save these uploaded zips, and
I am wondering
> what would be the best way to do that. My two obvious
choices are -
>
> 1. Write them to an external text file with a
programmatically generated
> name, and enter the name in the database, keyed to the
user.
> 2. Write the zips themselves into a glob field in the
database.
>
> I'm inclined to the former, since I don't think there
would ever need to
> be any further manipulation of these zip codes, but what
do you think?
> Are there other choices I may have overlooked?
>
> --
> Murray --- ICQ 71997575
> Adobe Community Expert
> (If you *MUST* email me, don't LAUGH when you do so!)
> ==================
>
http://www.projectseven.com/go
- DW FAQs, Tutorials & Resources
>
http://www.dwfaq.com - DW FAQs,
Tutorials & Resources
> ==================
>
>

Database Primary Key Question - Best Practices

I posted this in the ADDT forum, but I imagine I'll get more
responses here:
All you database developers - how do you deal with primary
keys? Do you
ALWAYS use an AutoIncrement/AutoNumber? Or only sometimes? Is
there an
argument to NOT use AutoIncrement? I know how I create
databases and how
I usually do things. I know how a few of my colleagues work.
But how
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am
involved with.)
Alec
Adobe Community Expert

.oO(Alec)
>I posted this in the ADDT forum, but I imagine I'll get
more responses here:
>All you database developers - how do you deal with
primary keys? Do you
>ALWAYS use an AutoIncrement/AutoNumber?
No.
>Or only sometimes? Is there an
>argument to NOT use AutoIncrement?
AUTO_INCREMENT is a proprietary MySQL feature. For some
people this
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portability, simply
because for me and my projects it's very unlikely that I have
to change
the DBMS. I've chosen MySQL for good reasons and will stay
with it for
quite a while.
>I know how I create databases and how
>I usually do things. I know how a few of my colleagues
work. But how
>about the rest of the world? (Research for a MS Access
book I am
>involved with.)
It always depends on the table itself, what data it contains,
what I
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tables for
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entire record
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DBMS support
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table. It
simply means, that the used PK number is generated _before_
the record
itself is inserted. For me and my framework this has some
advantages
(makes the internal work a bit easier), but of course in
other cases an
AUTO_INCREMENT might be more appropriate.
So IMHO there's no general solution. If an AUTO_INCREMENT or
something
similar fits your needs, you should use it. I don't see a
real problem
with that.
Micha

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