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IDS Forum

Re: Required to have names for simple constraints?

Posted By: Art Kagel
Date: Friday, 9 September 2016, at 10:23 a.m.

In Response To: Re: Required to have names for simple constraints? (JOHN MURTARI)

Looks like a working plan John. One modification if you have not already
gone through this: Estimate the required space for the new table once it is
populated including for future growth and set the EXTENT SIZE and NEXT SIZE
for the table so that a full year (or at least six months' worth) of data
can reside in a single extent and that the table grows in the same 1/2 year
or year sized extents over time.

Better yet, I don't remember if you are using v12.10, but if you are,
consider partitioning the table using range/interval partitions. Then you
can configure it to automatically drop off the oldest partition and add a
new one. You can partition using either the transaction date or the
trans_id (giving each partition a range approximating the number of months
of data you want in each partition). Then a partition can contain say 4 to
6 months' data with a rolling 16 to 18 months on disk at all times and you
never have to do this clean up again!

If most queries against the data include the date/datetime or trans_id
column used to partition it fragment elimination will make those queries
more efficient even than for an all inclusive table lie you have now.


Art S. Kagel, President and Principal Consultant
ASK Database Management


Disclaimer: Please keep in mind that my own opinions are my own opinions
and do not reflect on the IIUG, nor any other organization with which I am
associated either explicitly, implicitly, or by inference. Neither do
those opinions reflect those of other individuals affiliated with any
entity with which I am affiliated nor those of the entities themselves.

On Fri, Sep 9, 2016 at 9:40 AM, JOHN MURTARI <> wrote:

> Fernando, Art,
> Thanks for your input -- especially that a table RENAME may keep some
> constraints present and tied to the table id. I was getting constraint
> already
> exists errors and starting to pull my hair out!!! Let me just recap what I
> was
> trying to do and the final solution for those interested.
> Old database (but busy) with a transaction table (transb_master) that had
> data
> going back for over 8 years, even though only data within the last year was
> ever referenced. The quickest fix plan (during early morning hours) is to:
> 1. Go into a mx window and stop new transaction recording.
> 2. Dump the schema for the existing table (which used named constraints for
> everything, including NOT NULL).
> dbschema -d db -t transb_master
> 3. Just use the "create table" part of the schema to create table
> transb_master_new. BUT -- don't include any indexes, NOT NULL or other
> constraints/triggers.
> 4. Load the new table with just recent data from the old, e.g.
> INSERT INTO transb_master_new SELECT * FROM transb_master WHERE trans_id >=
> 1404365
> 5. DROP the original table (trying to save it doing a RENAME generated
> constraint errors later - reasons as described in thread)
> 6. RENAME the new table to the original (still has no constraints).
> 7. Apply all the constraints, triggers, etc.. from the schema, I'm
> including
> examples of restoring NOT NULL, CHECK, and primary key -- the syntax diffs
> were driving me crazy!
> ALTER TABLE transb_master MODIFY user_name VARCHAR(64,24) NOT NULL
> nlbruser_name;
> nlbrctrans_id;
> ALTER TABLE transb_master ADD CONSTRAINT CHECK(status IN ('N' ,'S' ,'F' ))
> CONSTRAINT ckbrstatus;
> pkbr;
> 8. AGAIN - as folks said, the constraint names weren't all necessary, but
> to
> avoid issues with other tech staff on review -- easiest to make it look the
> same.
> ************************************************************
> *******************
> Forum Note: Use "Reply" to post a response in the discussion forum.


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