Re: Oracle to Postgres

Thanks for all the advice on the conversion stuff!

For the resource sizing I was chasing more CPU and memory analysis then
giving recommendations on right-sizing the VM.

On Fri, Jul 12, 2024 at 10:53 AM Ron Johnson <ronljohnsonjr(at)gmail(dot)com>
wrote:

> On Thu, Jul 11, 2024 at 8:02 PM Sam Stearns <sam(dot)stearns(at)dat(dot)com> wrote:
>
>> Howdy,
>>
>> We have a project to migrate our Oracle databases that are hosted on an
>> Oracle Database Appliance to Postgres hosted on a Linux VM. Questions:
>>
>>
>> 1. Is there a tool out there that we can use to analyze resource
>> sizing on the Appliance that will give resource sizing recommendations for
>> the VM?
>>
>>
> The appliance doesn't tell you how much space your database uses???
>
> Anyway, we converted an 8TB on-prem Oracle 12 db (heavy on CLOBs) to RDS
> Postgresql 12; the resulting db was about 6TB. I'm sure that vanilla PG
> would be about the same size (or smaller now, since compression on
> dupes-allowed b-tree indices is much better now than in PG 12).
>
>
>>
>> 1. Is there a schema conversion tool or similar out there that we can
>> use to convert Oracle ==> Postgres?
>>
>>
> As Keith said, Google is your friend.
>
> That's how I found ora2pg, which we used in our conversion project (for
> the data only; someone had to rewrite all the stored procedures).
>
> If you use ora2pg, remember to tell it to convert all of the NUMERIC(38,0)
> columns to BIGINT.
>
>>

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*Samuel Stearns*
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