OPERATIONS OF THE OHCC AND LMD

Hi all

I write for a question.

We migrated a db to an old Solaris machine with 10G to an Exadata with 11 GR 2.

Now, we would EHCC on tables that are at the heart of our DWH.

In the compression of tables and partitions, do we need to make some considerations about DML applied on?

Tables are processed using two DML group: 'insert or update' and 'delete then insert.

For completeness, do us using Datastage.

There are other considerations or parameters to be taken into account?

Thank you

Greetings

Sandro

To echo the comments of the other posters - OHCC is intended for non-volatile data.   Advanced compression (OLTP) is better for data more volatile that it compresses at the line level (OHCC is columnar, obviously), but that extra cost.

As you're running a DWH, I presume that you partition your tables by date (at least something similar).  If so:

-determine the frequency of the partitions are accessed by queries (day, week, month, quarter, year, etc.).

-determine what is the probability of data of each partition can be updated (usually with a DWH data is loaded every day and you can allow about a week to ensure that all errors are corrected)

Let's say that:

-95% of your hit data less than week old queries

-60% of your hit requests data from 7 to 31 days old.

-30% of your hit requests data between 32 and 366 days old

-2% of your hit requests given between 1 and 11 years old

-data for more than 11 years are removed from the DWH

I would therefore be to deploy OHCC like this:

NO COMPRESSION for no partitions up to 31 days old

BASS to QUERY for the divisions between the 32 days 366 days old

ARCHIVES TOP of old partitions

Assuming that your partitions are of a decent size, compressed partition and you should get a decent compression ratio.  Of course, you may want to / have to pay to your situation, but I found that it is a reasonable starting point.

Mark

Tags: Database

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